Diodes Incorporated
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AP63357

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

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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

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Type Buck
Minimum Input Voltage (V) 3.8
Maximum Input Voltage (V) 32
Output Current (A) 3.5
Minimum Output Voltage (V) 0.8
Maximum Output Voltage (V) VIN
Quiescent Current Typ (µA) 22
Shutdown Current Typ (µA) 1
Frequency Typ (kHz) 450
HS RDS(ON) (mΩ) 74
LS RDS(ON) (mΩ) 40
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

Related Content

Packages

Technical Documents

Evaluation Boards and User Guides

Calculators

Recommended Soldering Techniques

TN1.pdf

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-2605 2023-03-09 2023-06-09 Qualified Additional Cu Pillar Bump Site and Bill of Materials (BOM) Lead Frame Material