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AP63357

3.8V-32V INPUT, 3.5A Low Iq Synchronous Buck with Enhanced EMI Reduction PFM/PWM

Evaluation Boards and User Guides

AP63357DV-EVM-User-Guide.pdf (897 KB)

Contact Sales

Description

The AP63356/AP63357 is a 3.5A, synchronous buck converter with a wide input voltage range of 3.8V to 32V. The device fully integrates a 74mΩ high-side power MOSFET and a 40mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP63356/AP63357 device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated loop compensation network.

The AP63356/AP63357 design is optimized for Electromagnetic Interference (EMI) reduction. The converter features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time. It also has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which reduces high-frequency radiated EMI noise caused by MOSFET switching.

The device is available in a 3mm × 2mm V-DFN3020-13 package.

Feature(s)

VIN 3.8V to 32V
3.5A Continuous Output Current
0.8V ± 1% Reference Voltage
22μA Ultralow Quiescent Current (Pulse Frequency Modulation)
450kHz Switching Frequency
Pulse Width Modulation (PWM) Regardless of Output Load

AP63356

Supports Pulse Frequency Modulation (PFM)

AP63357
Up to 86% Efficiency at 5mA Light Load

Proprietary Gate Driver Design for Best EMI Reduction
Frequency Spread Spectrum (FSS) to Reduce EMI
Low-Dropout (LDO) Mode
Power Good Indicator with 5MΩ Internal Pull-up
Precision Enable Threshold to Adjust UVLO
Protection Circuitry

Undervoltage Lockout (UVLO)
Output Undervoltage Protection (UVP)
Cycle-by-Cycle Peak Current Limit
Thermal Shutdown

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)

Application(s)

12V and 24V Distributed Power Bus Supplies
Flat Screen TV Sets and Monitors
Power Tools and Laser Printers
White Goods and Small Home Appliances
FPGA, DSP, and ASIC Supplies
Home Audio
Network Systems
Set Top Boxes
Gaming Consoles
Consumer Electronics

Specifications & Technical Documents

Product Parameters

Compliance (Only Automotive Supports PPAP)	Standard
Type	Buck
HS RDS(ON) (mΩ)	74
LS RDS(ON) (mΩ)	40
MaximumInput Voltage (V)	32
MinimumInput Voltage (V)	3.8
Quiescent Current Typ (μA)	22
Shutdown Current Typ (µA)	1
Output Current (A)	3.5 A
Minimum Output Voltage (V)	0.8
Maximum Output Voltage (V)	VIN
Frequency Typ (kHz)	450
Features	Enable,Light Load Efficiency,Power-Good,Soft-start Fixed,Internal Loop Compensation,External Loop Compensation,UVLO Adjustable,Frequency Spread Spectrum,UVP,Overcurrent Protection,Thermal Shutdown,Synchronous Rectification

Technical Documents

Simplis Models

AP63357_12Vin_5Vout_test.sxsch.zip (10 KB)

AP63357.lb.zip (4 KB)

Evaluation Boards and User Guides

AP63357DV-EVM-User-Guide.pdf (897 KB)

Calculators

AP6335x-Q_Power_Calculation.xlsx (778 KB)

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2605	2023-03-09	2023-06-09	Qualified Additional Cu Pillar Bump Site and Bill of Materials (BOM) Lead Frame Material