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USER MANUAL MIC5318 Microchip
High Performance 300 mA μCap Ultra-Low Dropout Regulator
Features
• Ultra-Low Dropout Voltage 110 mV @ 300 mA
- Input Voltage Range: 2.3V to 6.0V
• 300 mA Guaranteed Output Current
• Stable with Ceramic Output Capacitors
• Ultra-Low Output Noise: 30 μV _RMS
• Low Quiescent Current: 85 μA Total
• High PSRR > 70 dB @ 1 kHz
• Less than 35 μs Turn-On Time
• High Output Accuracy
- ±2% Initial Accuracy
- ±3% over Temperature
• Thermal Shutdown and Current-Limit Protection
- Tiny 6-lead 1.6 mm x 1.6 mm UDFN package
- Thin SOT23-5 Package
Applications
- Mobile Phones
- PDAs
• GPS Receivers - Portable Electronics
• Digital Still and Video Cameras
General Description
The MIC5318 is a high performance, single output ultra-low dropout regulator, offering low total output noise in an ultra-small UDFN package. The MIC5318 is capable of sourcing 300 mA output current and offers high PSRR and low output noise, making it an ideal solution for RF applications.
Ideal for battery operated applications, the MIC5318 offers 2% initial accuracy, extremely low dropout voltage (110 mV @ 300 mA), and low ground current (typically 85 μA total). The MIC5318 can also be put into a "zero" off-mode current state, drawing no current when disabled.
The MIC5318 is available in the 1.6 mm x 1.6 mm UDFN package, occupying only 2.56 mm ^2 of PCB area, fully a 36% reduction in board area when compared to SC-70 and 2 mm x 2 mm UDFN packages.
The MIC5318 has an operating junction temperature range of -40^ to +125^ and is available in fixed and adjustable output voltages in lead-free (RoHS compliant) UDFN and Thin SOT23-5 packages.
Package Types
MIC5318 (FIXED)
6-Lead UDFN (MT)
(Top View)

text_image
EN [1] D [6] BYP GND [2] [5] NC IN [3] [4] OUTMIC5318 (FIXED)
5-Lead TSOT23 (D5)
(Top View)

MIC5318 (ADJ.)
6-Lead UDFN (MT)
(Top View)

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EN [1] D [6] BYP GND [2] [5] ADJ IN [3] [4] OUTMIC5318 (ADJ.)
5-Lead TSOT23 (D5)
(Top View)

Typical Application Circuit

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MIC5318-x.xYMT 1.6mm VOUTVIN EN BYP GND 1µF 0.01µF 1µF V_IN RF TransceiverFunctional Block Diagrams

flowchart
graph TD
subgraph Fixed Version
A["VIN"] --> B["EN"]
B --> C["V_REF"]
C --> D["Quick-Start"]
D --> E["Error Amp"]
E --> F["Current Limit"]
F --> G["GND"]
H["BYP"] --> I["Thermal Shutdown"]
I --> C
J["VOUT"] --> K["Ground"]
end
subgraph Adjustable Version
L["VIN"] --> M["EN"]
M --> N["V_REF"]
N --> O["Quick-Start"]
O --> P["Error Amp"]
P --> Q["Current Limit"]
Q --> R["GND"]
S["BYP"] --> T["Thermal Shutdown"]
T --> N
U["VOUT"] --> V["Ground"]
end
style Fixed Version fill:#f9f,stroke:#333
style Adjustable Version fill:#bbf,stroke:#333
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
| Supply Voltage ( V_IN ) | 0V to +6.5V |
| Enable Input Voltage ( V_EN ) | 0V to +6.5V |
| Power Dissipation (Note 1) | Internally Limited |
| ESD Rating | Note 2 |
Operating Ratings ‡
| Supply Voltage ( V_IN ) | +2.3V to +6.0V |
| Enable Input Voltage ( V_EN ) | 0V to V_IN |
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating rating.
Note 1: The maximum allowable power dissipation of any T_A (ambient temperature) is P_D(MAX) = (T_J(MAX) - T_A)/_JA . Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
2: Devices are ESD sensitive. Handling precautions are recommended. Human body model.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: V_IN = V_OUT + 1.0V ; C_OUT = 1.0 F ; I_OUT = 100 A ; T_J = +25^ , bold values valid for -40^ to +125^ , unless noted. (Note 1)
| Parameter | Symbol | Min. | Typ. | Max. | Units | Conditions |
| Output Voltage Accuracy | V_OUT | -2.0 | — | 2.0 | % | Variation from nominal V_OUT |
| -3.0 | — | 3.0 | Variation from nominal V_OUT ; -40°C to +125°C | |||
| Line Regulation | V_OUT(V_OUT × V_IN) | — | 0.02 | 0.6 | %/V | V_IN = V_OUT + 1V to 6.0V; I_OUT = 100 A |
| Load Regulation (Note 2) | V_OUTV_OUT | — | 0.2 | 2.0 | % I | _OUT = 100 A to 300 mA |
| Dropout Voltage (Note 3) | V_DO | — | 17 | — | mV | I_OUT = 50 mA; V_OUT ≥ 2.8V |
| — | 50 | 100 | I_OUT = 150 mA; V_OUT ≥ 2.8V | |||
| — | 110 | 200 | I_OUT = 300 mA; V_OUT ≥ 2.8V | |||
| Ground Pin Current (Note 4) | I_GND | — | 85 | 150 | μA | I_OUT = 0 mA to 300 mA |
| Ground Pin Current in Shutdown | I_SHDN | — | 0.01 | 1 | μA | V_EN ≤ 0.2V |
Note 1: Specification for packaged product only.
2: Regulation is measured at constant junction temperature using low duty cycle pulse testing, changes in output voltage due to heating effects are covered by the thermal regulation specification.
3: Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. For outputs below 2.3V, dropout voltage is the input-to-output differential with the minimum input voltage 2.3V.
4: Ground pin current is the regulation quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: V_IN = V_OUT + 1.0V ; C_OUT = 1.0 F ; I_OUT = 100 A ; T_J = +25^ , bold values valid for -40^ to +125^ , unless noted. (Note 1)
| Parameter | Symbol | Min. | Typ. | Max. | Units | Conditions |
| Ripple Rejection PSRR | — 75 | — | dB | f = Up to 1 kHz; C_OUT = 1.0 μF; C_BYP = 0.1 μF | ||
| — 55 | — | f = 1 kHz to 20 kHz; C_OUT = 1.0 μF; C_BYP = 0.1 μF | ||||
| Current Limit I | LIM | 340 500 | 900 mA V | _OUT = 0V | ||
| Output Voltage Noise e | N | — 30 | — μV | RMS | C_OUT = 1.0 μF; C_BYP = 0.1 μF;10 Hz to 100 kHz | |
| Enable Input | ||||||
| Enable Input Voltage V | EN | — — | 0.2 | V | Logic Low | |
| 1.1 — | — Logic | High | ||||
| Enable Input Current | _EN | — 0.0 | 1 | 1 | μAV | V_IL ≤ 0.2V |
| — 0.0 | 1 | 1 | _IH ≥ 1.0V | |||
| Turn-On Time | ||||||
| Turn-On Time | _ON | — 30 | 100 | μs | C_OUT = 1.0 μF; C_BYP = 0.1 μF; I_OUT = 150 mA | |
Note 1: Specification for packaged product only.
2: Regulation is measured at constant junction temperature using low duty cycle pulse testing, changes in output voltage due to heating effects are covered by the thermal regulation specification.
3: Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. For outputs below 2.3V, dropout voltage is the input-to-output differential with the minimum input voltage 2.3V.
4: Ground pin current is the regulation quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
TEMPERATURE SPECIFICATIONS
| Parameters | Sym. | Min. | Typ. | Max. | Units | Conditions |
| Temperature Ranges | ||||||
| Maximum Junction Temperature Range | T_J(MAX) | -40 — | +125 °C — | |||
| Operating Temperature Range | T_J | -40 — | +125 °C — | |||
| Storage Temperature Range | T_S | -65 — | +150 °C — | |||
| Lead Temperature | — | — | — | +260 | °C | Soldering, 3 sec. |
| Package Thermal Resistance | ||||||
| Thermal Resistance, UDFN 6-Lead | _JA | — 100 | — | °C/W — | ||
| Thermal Resistance, TSOT23-5 | _JA | — 235 | — | °C/W — | ||
Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., T_A , T_J , _JA ). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum rating. Sustained junction temperatures above that maximum can impact device reliability.
2.0 TYPICAL OPERATING CHARACTERISTICS
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.

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| FREQUENCY (kHz) | VOUT (dB) | COUT (dB) | CBYP (dB) | | --------------- | --------- | --------- | --------- | | 1.0 | -70 | -70 | -70 | | 100 | -75 | -75 | -75 | | 1,000 | -80 | -80 | -80 | | 1,0000 | -85 | -85 | -85 | | 1,00000 | -90 | -90 | -90 | | 1,000000 | -95 | -95 | -95 | | 1,0000000 | -100 | -100 | -100 |FIGURE 2-1: Power Supply Rejection Ratio.

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| OUTPUT CURRENT (mA) | OUTPUT VOLTAGE (V) | | ------------------- | ------------------- | | 0 | 2.80 | | 100 | 2.80 | | 150 | 2.80 | | 200 | 2.80 | | 250 | 2.80 | | 300 | 2.80 | | 350 | 2.80 |FIGURE 2-4: Output Voltage vs. Output Current.

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| TEMPERATURE (°C) | OUTPUT VOLTAGE (V) | | --------------- | ------------------ | | -40 | 1.6 | | 0 | 1.6 | | 20 | 1.6 | | 40 | 1.6 | | 60 | 1.6 | | 80 | 1.6 | | 100 | 1.6 | | 120 | 1.6 |FIGURE 2-2: Output Voltage vs. Temperature.

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| TEMPERATURE (°C) | 50mA | 150mA | 300mA | | ---------------- | ---- | ----- | ----- | | -40 | 15 | 45 | 100 | | 0 | 20 | 50 | 110 | | 40 | 25 | 55 | 120 | | 80 | 30 | 60 | 130 | | 120 | 35 | 65 | 140 |FIGURE 2-5: Dropout Voltage vs. Temperature.

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| SUPPLY VOLTAGE (V) | OUTPUT VOLTAGE (V) | | ------------------ | ------------------ | | 2 | 1.5 | | 3 | 2.8 | | 4 | 2.8 | | 5 | 2.8 | | 6 | 2.8 | | 7 | 2.8 |FIGURE 2-3: Output Voltage vs. Supply Voltage.

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| OUTPUT CURRENT (mA) | DROPOUT VOLTAGE (mV) | | ------------------- | -------------------- | | 0 | 0 | | 100 | 20 | | 150 | 30 | | 200 | 40 | | 250 | 50 | | 300 | 60 | | 350 | 70 | | 400 | 80 | | 450 | 90 | | 500 | 100 | | 550 | 110 |FIGURE 2-6: Dropout Voltage vs. Output Current.

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| TEMPERATURE (°C) | GROUND CURRENT (μA) | | ---------------- | ------------------- | | -40 | 75 | | 0 | 80 | | 20 | 85 | | 40 | 88 | | 60 | 90 | | 80 | 92 | | 100 | 93 | | 120 | 94 |FIGURE 2-7: Ground Pin Current vs. Temperature.

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| INPUT VOLTAGE (V) | CURRENT LIMIT (mA) | | ---------------- | ------------------ | | 2 | 495 | | 2.5 | 500 | | 3 | 505 | | 3.5 | 510 | | 4 | 515 | | 4.5 | 520 | | 5 | 525 | | 5.5 | 530 | | 6 | 560 |FIGURE 2-10: Current Limit vs. Input Voltage.

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| OUTPUT CURRENT (mA) | GROUND CURRENT (μA) | | ------------------- | --------------------- | | 0 | 80 | | 100 | 80 | | 150 | 80 | | 200 | 80 | | 250 | 80 | | 300 | 80 | | 350 | 80 | | 400 | 80 | | 450 | 80 | | 500 | 80 | | 550 | 80 | | 600 | 80 | | 650 | 80 | | 700 | 80 | | 750 | 80 | | 800 | 80 | | 850 | 80 | | 900 | 80 | | 950 | 80 | | 1000 | 80 |FIGURE 2-8: Ground Pin Current vs. Output Current.

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| FREQUENCY (kHz) | NOISE μV/Hz | | --------------- | ----------- | | 0.1 | ~1.0 | | 1.00 | ~0.5 | | 10.00 | ~0.1 | | 100.00 | ~0.05 | | 1000.00 | ~0.01 | | 10000.00 | ~0.005 |FIGURE 2-11: Output Noise Spectral Density.

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| INPUT VOLTAGE (V) | GROUND CURRENT (μA) | | ----------------- | ------------------- | | 4.5 | 80 | | 6.5 | 90 |FIGURE 2-9: Ground Pin Current vs. Input Voltage.

FIGURE 2-12: Enable Turn-On.

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| Input Voltage (2V/div) | Output Voltage (50mV/div) | | ---------------------- | ------------------------- | | 6V | Peak | | 3V | Baseline | | VOUT | 1.8V | | COUT | 1μF | | CBYP | 0.1μF | | IOUT | 10mA |
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| Time (40μs/div) | Output Voltage (50mV/div) | Output Current (100mA/div) | | --------------- | ------------------------- | -------------------------- | | 0 | 0 | 0 | | 300 | 300 | 10 | | 400 | 300 | 10 |FIGURE 2-13: Line Transient. FIGURE 2-14: Load Transient.
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
| Pin Number UDFN-6 (Fixed) | Pin Number UDFN-6 (Adj.) | Pin Number TSOT23-5 (Fixed) | Pin Number TSOT23-5 (Adj). | Pin Name | Description |
| 1 1 3 3 | EN | Enable Input. Active-High. High = on, low = off. Do not leave floating. | |||
| 2 2 2 2 | GND Ground | ||||
| 3 3 1 1 | N Supply Input. | ||||
| 4 4 5 5 | OUT Output Voltage. | ||||
| 5 | — | — | — | NC | No connection. |
| — | 5 | — | 4 | ADJ | Adjust Input. Connect to external resistor voltage divider network. |
| 6 6 4 | — | BYP | Reference Bypass: Connect external 0.01 μF to GND for reduced Output Noise. May be left open. | ||
| ePad | ePad | — | — | EP | Exposed Heat Sink Pad: connected to ground internally. |
4.0 APPLICATION INFORMATION
4.1 Enable/Shutdown
The MIC5318 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a "zero" off-mode current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output.
4.2 Input Capacitor
The MIC5318 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1 F capacitor is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high-frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit.
4.3 Output Capacitor
The MIC5318 requires an output capacitor of 1 F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1 F ceramic output capacitor and does not improve significantly with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range.
4.4 Bypass Capacitor
A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1 F capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5318 to drive a large capacitor on the bypass pin
without significantly slowing turn-on time. Refer to the Typical Operating Characteristics for performance with different bypass capacitors.
4.5 No-Load Stability
Unlike many other voltage regulators, the MIC5318 will remain stable and in regulation with no load. This is especially crucial for CMOS RAM keep-alive applications.
4.6 Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5318 can be adjusted from 1.25V to 5.5V by using two external resistors (Figure 4-1). The resistors set the output voltage based on the following equation:
EQUATION 4-1:
$$ V _ {O U T} = V _ {R E F} \times \left(1 + \frac {R 1}{R 2}\right) $$
Where:
$$ V _ {R E F} = 1. 2 5 \mathrm{V} $$

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MIC5318YMT VIN VOUT EN ADJ GND R1 R2 1μF 1μF VOUTFIGURE 4-1: Adjustable Voltage Output.
4.7 Thermal Considerations
The MIC5318 is designed to provide 300 mA of continuous current. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 3.3V, the output voltage is 2.8V and the output current equals 300 mA.
The actual power dissipation of the regulator circuit can be determined using the equation:
EQUATION 4-2:
$$ P _ {D} = (V _ {I N} - V _ {O U T}) \times I _ {O U T} + V _ {I N} \times I _ {G N D} $$
Because this device is CMOS and the ground current is typically <100 A over the load range, the power dissipation contributed by the ground current is <1% and can be ignored for this calculation:
EQUATION 4-3:
$$ P _ {D} = (3. 3 V - 2. 8 V) \times 3 0 0 m A = 0. 1 5 W $$
To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
EQUATION 4-4:
$$ P _ {D (M A X)} = \frac {T _ {J (M A X)} - T _ {A}}{\theta_ {J A}} $$
Where:
T_J(MAX) = 125^ , the max. junction temp. of the die. _JA = 100^/W
Table 4-1 shows junction-to-ambient thermal resistance for the MIC5318 in the 6-lead 1.6 mm x 1.6 mm UDFN package.
TABLE 4-1: THERMAL RESISTANCE
| Package | _JA for Recommended Min. Footprint |
| 6-Lead UDFN | 100°C/W |
Substituting P_D for P_D(MAX) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 100^/W .
The maximum power dissipation must not be exceeded for proper operation.
For example, when operating the MIC5318-2.8YMT at an input voltage of 3.3V and 300 mA load with a minimum footprint layout, the maximum ambient operating temperature T_A can be determined as follows:
EQUATION 4-5:
$$ \begin{array}{r l} 0. 1 5 W & = (1 2 5 ^ {\circ} C - T _ {A}) / 1 0 0 ^ {\circ} \mathrm{C/W} \ & T _ {A} = 1 1 0 ^ {\circ} C \end{array} $$
Therefore, a 2.8V application with 300 mA of output current can accept an ambient operating temperature of 110°C in a 1.6 mm x 1.6 mm UDFN package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the "Regulator Thermals" section of Microchip's Designing with Low-Dropout Voltage Regulators handbook.
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
5-Lead TSOT-23*

Example

6-Lead UDFN*

Example

| Legend: | XX...X Product code or customer-specific informationY Year code (last digit of calendar year)YY Year code (last 2 digits of calendar year)WW Week code (week of January 1 is week ‘01’)NNN Alphanumeric traceability codee3 Pb-free JEDEC® designator for Matte Tin (Sn)* This package is Pb-free. The Pb-free JEDEC designator (e3) can be found on the outer packaging for this package.•, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle mark). |
| Note: | In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo.Underbar(_) and/or Overbar(~) symbol may not be to scale. |
TABLE 5-1: MARKING CODES
| Part Number Marking Code Output Voltage | ||
| MIC5318-1.5YMT 15D 1.5V | ||
| MIC5318-1.8YMT 18D 1.8V | ||
| MIC5318-2.5YMT 25D 2.5V | ||
| MIC5318-2.8YMT 28D 2.8V | ||
| MIC5318-3.3YMT 33D 3.3V | ||
| MIC5318YMT DAA Adjustable | ||
| MIC5318-1.5YD5 QD | _15 1.5V | |
| MIC5318-1.8YD5 QD | _15 1.8V | |
| MIC5318-2.5YD5 QD | _25 2.5V | |
| MIC5318-2.8YD5 QD | _28 2.8V | |
| MIC5318-3.3YD5 QD | _33 3.3V | |
| MIC5318YD5 QD | _AA | Adjustable |
5-Lead TSOT-23 Package Outline and Recommended Land Pattern
5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
![Microchip MIC5318 - 5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1 - 1](/content/2026/06/1222009/images/12d4d9e08b787e4c798c3c90aca67ebb4ee445fb026e204bd9fc9e109ad53b14.jpg)
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2X 0.20 C D e1 A N E1/2 E1 E2 E 2X 0.15 C D NOTE 1 1 2 e B NX b 5X TIPS 0.20 C Ø 0.20M C A-B DTOP VIEW
![Microchip MIC5318 - 5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1 - 2](/content/2026/06/1222009/images/1478d928f5772287702cbb26fb6fbd773e4867b7b05b67698c5e10aaa3e74362.jpg)
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A A A2 A1 A 0.20 C SEATING PLANE CSIDE VIEW
Microchip Technology Drawing C04-1179 Rev A Sheet 1 of 2
5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
![Microchip MIC5318 - 5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1 - 1](/content/2026/06/1222009/images/1da102b8d26875a00ae572a32b03588ccce314543c0b1d9332a53be9aa3dd6d2.jpg)
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VIEW A-A SHEET 1| Units | MILLIMETERS | |||
| Dimension Limits | MIN | NOM | MAX | |
| Number of Leads | N | 5 | ||
| Pitch | e | 0.95 BSC | ||
| Outside lead pitch | e1 | 1.90 BSC | ||
| Overall Height | A | - | - | 1.00 |
| Molded Package Thickness | A2 | 0.84 | 0.87 | 0.90 |
| Standoff | A1 | 0.00 | - | 0.10 |
| Overall Width | E | 2.80 BSC | ||
| Molded Package Width | E1 | 1.60 BSC | ||
| Overall Length | D | 2.90 BSC | ||
| Foot Length | L | 0.30 | 0.40 | 0.50 |
| Footprint | L1 | 0.60 REF | ||
| Foot Angle | 0° | - | 4° | |
| Lead Thickness | c | 0.127 REF | ||
| Lead Width | b | 0.30 | - | 0.50 |
Notes:
1. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25mm per side.
2. Dimensioning and tolerancing per ASME Y14.5M
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.
Microchip Technology Drawing C04-1179 Rev A Sheet 1 of 2
5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
![Microchip MIC5318 - 5-Lead Plastic Thin Small Outline Transistor (D5A) [TSOT] Micrel Legacy Package TSOT-5LD-PL-1 - 1](/content/2026/06/1222009/images/25eae6c102d71e4ba993854f65833e2cc8facd85e7ef46ac50e80cfccee473be.jpg)
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5 X1 Y1 C SILK SCREEN 1 2 G ERECOMMENDED LAND PATTERN
| Units | MILLIMETERS | |||
| Dimension Limits | MIN | NOM | MAX | |
| Contact Pitch | E | 0.95 BSC | ||
| Contact Pad Spacing | C | 2.60 | ||
| Contact Pad Width (X5) | X1 | 0.60 | ||
| Contact Pad Length (X5) | Y1 | 1.10 | ||
| Contact Pad to Center Pad (X2) | G | 0.20 | ||
Notes:
- Dimensioning and tolerancing per ASME Y14.5M
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
Microchip Technology Drawing C04-3179 Rev A
6-Lead UDFN Package Outline and Recommended Land Pattern
6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
![Microchip MIC5318 - 6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1 - 1](/content/2026/06/1222009/images/dd6d8382bbd62d5ed4a741ab3cbdb80f06699dbf4eb16a0ee59b36de4edfcc05.jpg)
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(DATUM A) (DATUM B) NOTE1 2X 0.05 C 2X 0.05 C N E A B E 1 2 TOP VIEW![Microchip MIC5318 - 6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1 - 2](/content/2026/06/1222009/images/dc92bcdd782027944fe252aad81df116ead88942a5a43863d21f4cce9522d142.jpg)
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SEATING PLANE A C A1 (A3) SIDE VIEW // 0.05 C 6X 0.08 C![Microchip MIC5318 - 6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1 - 3](/content/2026/06/1222009/images/9f4fc551bacf1a85e9d86d77a2e9b9a82ee196e6ba8a919b44416189751d30ee.jpg)
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NOTE 1 D2 1 2 E2 K 0.20 L N 6X b e BOTTOM VIEW Ø 0.05M C A B Ø 0.05M C A B Ø 0.07M C A B Ø 0.04M CMicrochip Technology Drawing C04-1154 Rev A Sheet 1 of 2
6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
![Microchip MIC5318 - 6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1 - 4](/content/2026/06/1222009/images/d4a126a2a64237586fa8bddb0179ca40068dc4f2fce1ab6fab19045d268d4b73.jpg)
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Isometric line drawing of two electronic components with slots and top tabs (no text or symbols)| Units | MILLIMETERS | |||
| Dimension Limits | MIN | NOM | MAX | |
| Number of Terminals | N | 6 | ||
| Pitch | e | 0.50 BSC | ||
| Overall Height | A | 0.50 | 0.55 | 0.60 |
| Standoff | A1 | 0.00 | 0.02 | 0.05 |
| Terminal Thickness | A3 | 0.152 REF | ||
| Overall Length | D | 1.60 BSC | ||
| Exposed Pad Length | D2 | 1.21 | 1.26 | 1.31 |
| Overall Width | E | 1.60 BSC | ||
| Exposed Pad Width | E2 | 0.45 | 0.50 | 0.55 |
| Terminal Width | b | 0.20 | 0.25 | 0.30 |
| Terminal Length | L | 0.30 | 0.35 | 0.40 |
| Terminal-to-Exposed-Pad | K | 0.20 | - | - |
Notes:
1. Pin 1 visual index feature may vary, but must be located within the hatched area.
2. Package is saw singulated
3. Dimensioning and tolerancing per ASME Y14.5M
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.
Microchip Technology Drawing C04-1154 Rev A Sheet 2 of 2
6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
![Microchip MIC5318 - 6-Lead Ultra Thin Plastic Dual Flat, No Lead (HKA) - 1.6x1.6x0.6 mm Body [UDFN] With 1.26x0.50 mm Exposed Pad; Micrel Legacy Package TDFN1616-6LD-PL-1 - 5](/content/2026/06/1222009/images/7f46b5a95c4b3fce2706c9ab59c05d933d1e801028591217a1eab0d18f178836.jpg)
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X2 G2 6 G1 C Y2 Y1 SILK SCREEN E 2 X1RECOMMENDED LAND PATTERN
| Units | MILLIMETERS | |||
| Dimension Limits | MIN | NOM | MAX | |
| Contact Pitch | E | 0.50 BSC | ||
| Center Pad Width | X2 | 1.30 | ||
| Center Pad Length | Y2 | 0.55 | ||
| Contact Pad Spacing | C | 1.70 | ||
| Contact Pad Width (X6) | X1 | 0.30 | ||
| Contact Pad Length (X6) | Y1 | 0.65 | ||
| Contact Pad to Center Pad (X6) | G1 | 0.25 | ||
| Contact Pad to Contact Pad (X4) | G2 | 0.20 | ||
Notes:
1. Dimensioning and tolerancing per ASME Y14.5M
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
Microchip Technology Drawing C04-3154 Rev A
NOTES:
APPENDIX A: REVISION HISTORY
Revision A (August 2021)
- Converted Micrel document MIC5318 to Microchip data sheet template DS20006578A.
- Minor grammatical text changes throughout.
NOTES:
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Device
Part No.
-X.X
Output
Voltage
X
Temperature
Range
X
Package
-XX
Media Type
| Device: | MIC5318: High Performance 300 mA μCap Ultra Low Dropout Regulator |
| = Adjustable1.5 = 1.5V | |
| Threshold Voltage: | 1.8 = 1.8V2.5 = 2.5V2.8 = 2.8V3.3 = 3.3V |
| Temperature Range: | Y = -40°C to +125°C |
| Package: | MT = 6-Lead UDFND5 = 5-Lead TSOT-23 |
| Media Type: | TR = 3,000/Reel (TSOT package option)TR = 5,000/Reel (UDFN package option) |
Examples:
a) MIC5318YMT-TR: MIC5318, Adjustable Output
Voltage, 6-Lead UDFN,
-40°C to +125°C Temp.
Range, 5,000/Reel
b) MIC5318-1.8YMT-TR: MIC5318, 1.8V Output
Voltage, 6-Lead UDFN,
-40°C to +125°C Temp.
Range, 5,000/Reel
c) MIC5318-3.3YMT-TR: MIC5318, 3.3V Output
Voltage, 6-Lead UDFN,
-40°C to +125°C Temp.
Range, 5,000/Reel
d) MIC5318YD5-TR: MIC5318, Adjustable Output
Voltage, 5-Lead TSOT-23,
-40°C to +125°C Temp.
Range, 3,000/Reel
e) MIC5318-1.5YD5-TR: MIC5318, 1.5V Output
Voltage, 5-Lead TSOT-23,
-40°C to +125°C Temp.
Range, 3,000/Reel
f) MIC5318-2.5YD5-TR: MIC5318, 2.5V Output
Voltage, 5-Lead TSOT-23,
-40°C to +125°C Temp.
Range, 3,000/Reel
Note 1: Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option.
NOTES:
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specifications contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is secure when used in the intended manner and under normal conditions.
- There are dishonest and possibly illegal methods being used in attempts to breach the code protection features of the Microchip devices. We believe that these methods require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Attempts to breach these code protection features, most likely, cannot be accomplished without violating Microchip's intellectual property rights.
• Microchip is willing to work with any customer who is concerned about the integrity of its code.
- Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is "unbreakable." Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication is provided for the sole purpose of designing with and using Microchip products. Information regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications.
THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS". MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE OR WARRANTIES RELATED TO ITS CONDITION, QUALITY, OR PERFORMANCE.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE INFORMATION OR ITS USE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY RELATED TO THE INFORMATION OR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THE INFORMATION. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated.
Trademarks
The Microchip name and logo, the Microchip logo, Adaptec, AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud, chipKIT, chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, HELDO, IGLOO, JukeBlox, KeeLoq, Kleer, LANCheck, LinkMD, maXStylus, maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo, MOST, MOST logo, MPLAB, OptoLyzer, PackeTime, PIC, picoPower, PICSTART, PIC32 logo, PolarFire, Prochip Designer, QTouch, SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash, Symmetricom, SyncServer, Tachyon, TimeSource, tinyAVR, UNI/O, Vectron, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
AgileSwitch, APT, ClockWorks, The Embedded Control Solutions Company, EtherSynch, FlashTec, Hyper Speed Control, HyperLight Load, IntellIMOS, Libero, motorBench, mTouch, Powermite 3, Precision Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, Quiet-Wire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub, TimePictra, TimeProvider, WinPath, and ZL are registered trademarks of Microchip Technology Incorporated in the U.S.A.
Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, Augmented Switching, BlueSky, BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, Espresso T1S, EtherGREEN, IdealBridge, In-Circuit Serial Programming, ICSP, INICnet, Intelligent Paralleling, Inter-Chip Connectivity, JitterBlocker, maxCrypto, maxView, memBrain, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, RTAX, RTG4, SAM-ICE, Serial Quad I/O, simpleMAP, SimpliPHY, SmartBuffer, SMART-I.S., storClad, SQI, SuperSwitcher, SuperSwitcher II, Switchtec, SynchroPHY, Total Endurance, TSHARC, USBCheck, VariSense, VectorBlox, VeriPHY, ViewSpan, WiperLock, XpressConnect, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies.
© 2021, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-8826-2
For information regarding Microchip's Quality Management Systems, please visit www.microchip.com/quality.
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