Diodes Incorporated AP64500/AP64501 DC-DC Buck Converters

Diodes Inc. AP64500/AP64501 DC-DC Buck Converters are 5A and synchronous with a wide input voltage range of 3.8V to 40V. TheDiodes Inc. AP64500/AP64501 fully integrates a 45mΩ high-side power MOSFET and a 20mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. The AP64500/AP64501 is easily used by minimizing the external component count due to its peak current mode control adoption.

The AP64500/AP64501 design is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times. This reduces high-frequency radiated EMI noise caused by MOSFET switching. The AP64500/AP64501 Converters additionally feature 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 time. The AP64500/AP64501 is offered in a SO-8EP package.

Features

V_IN 3.8V to 40V
5A continuous output current
0.8V ±1% reference voltage
25µA low quiescent current (pulse frequency modulation)
100kHz to 2.2MHz (AP64500) programmable switching frequency
100kHz to 2.2MHz (AP64500) external clock synchronization
570kHz switching frequency (AP64501)
Programmable soft-start time (AP64501)
Up to 85% efficiency at 5mA light load
Proprietary gate driver design for best EMI reduction

Frequency Spread Spectrum (FSS) to reduce EMI
Low-Dropout (LDO) mode
Precision enable threshold to adjust UVLO
Protection circuitry
- Undervoltage Lockout (UVLO)
- Output Overvoltage Protection (OVP)
- Cycle-by-cycle peak current limit
- Thermal shutdown
Totally lead-free and fully RoHS compliant
Halogen and antimony free "green" device