Diodes AP63203 User Manual

AP63203 EVB User Guide

1. General Description

The AP63203 is a 2A, synchronous buck converter with up to 32V wide input voltage range, which fully
integrates a 140mΩ high-side MOSFET and a 70mΩ low-side MOSFET to provide high efficiency
step-down DC/DC conversion. The AP63203 adopts peak current mode control with the integrated
compensation network, which makes AP63203 easily to be used by minimizing the off-chip component
count. The AP63203 supports the Pulse Skipping Modulation (PSM) with typical 22uA Ultra-low
Quiescent and achieved high efficient performance at light load conditions.
The AP63203 is fixed output buck converters with optimized design for Electromagnetic Interference
(EMI) reduction. The AP63203 features Frequency Spread Spectrum (FSS) with ± 6% jittering span of the
1.1MHz switching frequency and modulation rate 1/512 of switching frequency to reduce the conducted
EMI. The converter has proprietary designed gate driver scheme to resist switching node ringing without
sacrificing MOSFET turn on and turn off time, which further erases high frequency radiation EMI noise
caused by the MOSFETs hard switching.
The AP63203 offers output overvoltage protection, cycle-by-cycle peak current limit, and thermal
shutdown protection. The device is available in a low-profile TSOT23-6 package.

2. Key Features


EMI Reduction with Switching Node Ringing-free

3.8V-32V Wide Input Voltage Range

Up to 2A Continuous Output Load Current

Shutdown Current: <1µ A

1.1Mitching Frequency with 6% Frequency Spread Spectrum (FSS)

Precision Enable Threshold for Programmable UVLO Threshold and Hysteresis

Low Dropout Mode Operation

No External Compensation Required

Current Limit Protection

Short Circuit Protection

Over Output Voltage Protection
Thermal Shutdown
EVB User Guide
AE Department
AP63203