3.8V To 40V, 5A Low Iq Synchronous Buck with Programmable Frequency
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AP64500
3.8V TO 40V INPUT, 5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE FREQUENCY Description Pin Assignments The AP64500 is a 5A, synchronous buck converter with a wide input
voltage range of 3.8V to 40V. The device fully integrates a 45mΩ highside power MOSFET and a 20mΩ low-side power MOSFET to provide
high-efficiency step-down DC-DC conversion. TOP VIEW
BST 1 VIN 2 8 SW 7 GND The AP64500 device is easily used by minimizing the external
component count due to its adoption of peak current mode control.
The AP64500 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, which reduces high-frequency radiated EMI noise
caused by MOSFET switching. AP64500 also 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. EXPOSED PAD
9
EN 3 6 COMP RT/CLK 4 5 FB SO-8EP The device is available in an SO-8EP package. Features VIN 3.8V to 40V
5A Continuous Output Current
0.8V ± 1% Reference Voltage
25µA Low Quiescent Current (Pulse Frequency Modulation)
Programmable Switching Frequency: 100kHz to 2.2MHz
External Clock Synchronization: 100kHz to 2.2MHz
Up to 85% Efficiency at 5mA Light Load …
