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USER MANUAL MIC23153-GYMT Microchip
MIC23153 Evaluation Board
4MHz PWM 2A Buck Regulator with HyperLight Load™ and Power Good
General Description
This board enables the evaluation of the MIC23153, a fully integrated 2A, 4MHz switching regulator featuring HyperLight Load™ mode, Power Good output indicator, and programmable soft-start. The MIC23153 is highly efficient throughout the entire output current range, drawing just 23μA of quiescent current in operation. The tiny 2.5mm x 2.5mm Thin MLF® package, in combination with the 4MHz switching frequency, enables a compact sub-1mm height solution with only four external components. The MIC23153 provides accurate output voltage regulation under the most demanding conditions and responds extremely quickly to a load transient with exceptionally small output voltage ripple.
Requirements
This board needs a single 10W bench power source adjustable from 2.7V to 5.5V. The loads can either be active (electronic load) or passive (resistor) with the capability to dissipate 7W. It is ideal to have an oscilloscope available to view the circuit waveforms, but not essential. For the simplest tests, two Voltage meters are required to measure input and output voltage. For efficiency measurements, two Voltage meters and two Ammeters are required to prevent errors due to measurement inaccuracies.
Precautions
There is no reverse input protection on this board. Be cautious when connecting the input source to ensure correct polarity is observed.
Getting Started
- Connect an external supply to the V_IN (J4) terminal and GND (J3). With the output of the power supply disabled, set its voltage to the desired input test voltage (2.7V ≤ V_IN ≤ 5.5V). An ammeter may be placed between the input supply and the V_IN (J4) terminal. Be sure to monitor the supply voltage at the V_IN (J4) terminal, as the ammeter and/or power lead resistance can reduce the voltage supplied to the device.
- Connect a load to the V_OUT (J1) and ground (J2) terminals. The load can be either active passive (resistive) or active (electronic load). An ammeter may be placed between the load and the output terminal. Ensure the output voltage is monitored at the V_OUT (J1) terminal.
- Enable the MIC23153. The MIC23153 evaluation board has a pull-up resistor to V_IN . By default, the output voltage will be enabled when the input supply of >2.7V is applied. To disable the device, apply a voltage below 0.5V to the EN (J6) terminal.
- Power Good. A Power good test point (J5) is provided to monitor the Power Good function. The Power Good output will go high (Vout) approximately 70μs after the output voltage reaches 92% of its nominal voltage.
Ordering Information
| Part Number Description |
| MIC23153-GYMT 1.8V Fixed Output Evaluation Board |
| MIC23153YMT Adjustable Output Evaluation Board |
HyperLight Load is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademark Amkor Technology Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax +1 (408) 474-1000 • http://www.micrel.com
Evaluation Board
The MIC23153 has a nominal 270kOhm resistor charging the capacitor on the SS pin. This enables the output to follow a controlled soft start characteristic. Setting C3 to 100pF sets the startup time to the minimum. The start-up time can be determined by:
$$ T _ {s s} = 2 7 0 \times 1 0 ^ {3} \times \ln (1 0) \times C _ {s s} $$
The action of the soft-start capacitor is to control the rise time of the internal reference voltage between 0% and 100% of its nominal steady state value.
Feedback Resistors (R1, R2) for Adjustable Output
The output voltage is set nominally to 1.8V. This output can be changed by adjusting the upper resistor, R1, in the feedback potential divider. Therefore:
$$ R 1 = R 2 \times V _ {R E F} / \left(V _ {O} - V _ {R E F}\right) $$
Where V_REF = 0.62V
Some example values are:
| V_OUT | R1 | |
| 1.2V | 274k | 294k |
| 1.5V | 316k | 221k |
| 1.8V | 301k | 158k |
| 2.5V | 324k | 107k |
| 3.3V | 309k | 71.5k |
The Feed-forward capacitor, C4, is typically not fitted since transient load regulation is already very good, however, it can be improved slightly by fitting a capacitor
at C4 to inject fast output voltage deviations directly into the feedback comparator. This improved load regulation is at the expense of slightly increasing the amount of noise on the output at higher loads. Values between 100pF and 1nF are recommended to prevent instability.
Power Good (PG)
The evaluation board has a test point provided to the right of EN for testing PG. This is an open drain connection with an on board pull-up resistor of 10k to the output voltage. This is asserted high approximately 70 s after the output voltage passes 92% of the nominal set voltage.
HyperLight Load™ Mode
MIC23153 uses a minimum on and off time proprietary control loop (patented by Micrel). When the output voltage falls below the regulation threshold, the error comparator begins a switching cycle that turns the PMOS on and keeps it on for the duration of the minimum-on-time. This increases the output voltage. If the output voltage is over the regulation threshold, then the error comparator turns the PMOS off for a minimum-off-time until the output drops below the threshold. The NMOS acts as an ideal rectifier that conducts when the PMOS is off. Using a NMOS switch instead of a diode allows for lower voltage drop across the switching device when it is on. The asynchronous switching combination between the PMOS and the NMOS allows the control loop to work in discontinuous mode for light load operations. In discontinuous mode, the MIC23153 works in pulse frequency modulation (PFM) to regulate the output. As the output current increases, the off-time decreases, thus provides more energy to the output. This switching scheme improves the efficiency of MIC23153 during light load currents by only switching when it is needed. As the load current increases, the MIC23153 goes into continuous conduction mode (CCM) and switches at a frequency centered at 4MHz. The equation to calculate the load when the MIC23153 goes into continuous conduction mode may be approximated by the following formula:
$$ I _ {\text { LOAD }} > \left(\frac {- \quad_ {\text { OUTIN }} \times D)}{2 L \times f}\right) V (V $$
R2 As shown in the previous equation, the load at which MIC23153 transitions from HyperLight Load ^™ mode to PWM mode is a function of the input voltage ( V_IN ), output voltage ( V_OUT ), duty cycle (D), inductance (L) and frequency (f). As shown in the Switching Frequency vs Load graph, as the Output Current increases, the switching frequency also increases until the MIC23153 goes from HyperLight Load ^™ mode to PWM mode at approximately 120mA. The MIC23153 will switch at a relatively constant frequency around 4MHz once the output current is over 120mA.
Evaluation Board Performance
Switching Frequency vs. Load Current
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| LOAD CURRENT (A) | SW FREQUENCY (kHz) | | ---------------- | ------------------ | | 0.00001 | 1 | | 0.001 | 10 | | 0.1 | 100 | | 1 | 1000 | | 10 | 10000 |Efficiency vs. Output Current V_OUT = 1.8V @ 25^
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| OUTPUT CURRENT (A) | EFFICIENCY (%) | | ------------------ | -------------- | | 0.00001 | ~45% | | 0.001 | ~60% | | 0.1 | ~85% | | 1 | ~90% | | 10 | ~85% | | 100 | ~75% |Efficiency vs. Output Current V_OUT = 3.3V @ 25^
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| OUTPUT CURRENT (A) | V_IN = 4.2V | V_IN = 5.5V | V_IN = 5V | | ------------------ | ----------- | ----------- | --------- | | 0.00001 | ~40% | ~40% | ~40% | | 0.001 | ~60% | ~60% | ~60% | | 0.1 | ~80% | ~80% | ~80% | | 1 | ~90% | ~90% | ~90% |V_OUT Rise Time
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| CSS (pF) | RISE TIME (μs) | | -------- | -------------- | | 100 | 10 | | 1000 | 100 | | 10000 | 1000 | | 100000 | 10000 | | 1000000 | 100000 |Enable Threshold vs. Input Voltage
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| INPUT VOLTAGE (V) | VEN THRESHOLD (V) | | ----------------- | ------------------ | | 2.5 | 0.8 | | 3.0 | 0.85 | | 3.5 | 0.9 | | 4.0 | 0.95 | | 4.5 | 1.0 | | 5.0 | 1.05 | | 5.5 | 1.1 |MIC23153-xYMT Evaluation Board Schematic (Fixed Output)
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VIN J4 R4 10k C1 4.7μF/6.3V VIN U1 VIN VIN SW SNS MIC23153-xYMT PG EN PGND AGND EN NC SS C3 4.70pF R2 NOT FITTED R1 NOT FITTED L1 1uH R3 10k C4 4.7μF/6.3V C2 4.7μF/6.3V J1 VOUT J2 GND J5 PG J6 J3Bill of Materials
| Item | Part Number | Manufacturer | Description Qty. | |
| C1 | C1608X5R0J475K | TDK^(1) | Ceramic Capacitor, 4.7μF, 6.3V, X5R, Size 0603 | 1 |
| GRM188R60J475KE19D | Murata^(2) | |||
| C2 | C1608X5R0J475K | TDK | 1 | |
| GRM188R60J475KE84D | Murata | |||
| C3 C16 | 08NPO0J471K TDK Ceramic Capacitor, 470pF, 6.3V, NPO, Size 0603 1 | |||
| C4 - - | Not Fitted (NF) 0 | |||
| L1 | VLS3012ST-1R0N1R9 | TDK | 1μH, 2A, 60mΩ, L3.0mm x W3.0mm x H1.0mm | 1 |
| LQH44PN1R0NJ0 | Murata | 1μH, 2.8A, 50mΩ, L4.0mm x W4.0mm x H1.2mm | ||
| R1 | - | - | Not Fitted (NF) | 0 |
| R2 | - | - | Not Fitted (NF) | 0 |
| R3 | CRCW06031002FKEA | Vishay^(3) | Resistor,10k, Size 0603 | 1 |
| R4 | CRCW06031002FKEA | Vishay | Resistor,10k, Size 0603 | 1 |
| U1 | MIC23153-xYMT | Micrel, Inc.(4) | 4MHz 2A Buck Regulator with HyperLight Load^TM Mode | 1 |
Notes:
- TDK: www.tdk.com.
- Murata: www.murata.com.
- Vishay: www.vishay.com.
- Micrel, Inc.: www.micrel.com.
MIC23153 Evaluation Board Schematic (Adjustable Output)
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VIN J4 R4 10k C1 4.7μF/6.3V U1 VIN VIN SW SNS MIC23153-xYMT PG EN J5 J6 GND J3 VOUT R3 10k L1 1uH R1 300K C4 OPTIONAL C2 4.7μF/6.3V J2 GND R2 160K C3 4.70pF FB SS PGND AGNDBill of Materials
| Item | Part Number | Manufacturer | Description Qty. | |
| C1 | C1608X5R0J475K | TDK^(1) | Ceramic Capacitor, 4.7μF, 6.3V, X5R, Size 0603 | 1 |
| GRM188R60J475KE19D | Murata^(2) | |||
| C2 | C1608X5R0J475K | TDK | 1 | |
| GRM188R60J475KE84D | Murata | |||
| C3 C16 | 08NPO0J471K TDK Ceramic Capacitor, 470pF, 6.3V, NPO, Size 0603 1 | |||
| C4 - - | Not Fitted (FT) 0 | |||
| L1 | VLS3010ST-1R0N1R9 | TDK | 1μH, 2A, 60mΩ, L3.0mm x W3.0mm x H1.0mm | 1 |
| LQH44PN1R0NJ0 | Murata^(2) | 1μH, 2.8A, 50mΩ, L4.0mm x W4.0mm x H1.2mm | ||
| R1 | CRCW06033013FKEA | Vishay^(3) | Resistor,301k, Size 0603 | 1 |
| R2 | CRCW06031583FKEA | Vishay | Resistor,158k, Size 0603 | 1 |
| R3 | CRCW06031002FKEA | Vishay | Resistor,10k, Size 0603 | 1 |
| R4 | CRCW06031002FKEA | Vishay | Resistor,10k, Size 0603 | 1 |
| U1 | MIC23153YMT | Micrel, Inc.(4) | 4MHz 2A Buck Regulator with HyperLight Load^TM Mode | 1 |
Notes:
- TDK: www.tdk.com.
- Murata: www.murata.com.
- Vishay: www.vishay.com.
- Micrel, Inc.: www.micrel.com.
PCB Layout Recommendations
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ICREL,Inc. 408-944-0800 VOUT J1 GND J2 GND J3 VIN J4 MIC23153- YMT 1407.973 (mil) 1419.083 (mil)Thin MLF Top Layer
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1407.973 (mil) 1419.083 (mil) M2-20+10.1408 ICRRII, Inc. TMY ICRSI 25-MYLT RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS 600 0800 RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSD RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RSO RDS RBOThin MLF Bottom Layer
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
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