3.8V To 40V, 3.5A Low Iq Synchronous Buck with Programmable Soft-start Time
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AP64351
3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE SOFT-START TIME Description Pin Assignments The AP64351 is a 3.5A, synchronous buck converter with a wide input
voltage range of 3.8V to 40V. The device fully integrates a 75mΩ highside power MOSFET and a 45mΩ low-side power MOSFET to provide
high-efficiency step-down DC-DC conversion. TOP VIEW
BST 1 VIN 2 8 SW 7 GND The AP64351 device is easily used by minimizing the external
component count due to its adoption of peak current mode control.
The AP64351 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. AP64351 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 SS 4 5 FB SO-8EP The device is available in an SO-8EP package. Features VIN 3.8V to 40V
3.5A Continuous Output Current
0.8V ± 1% Reference Voltage
22µA Low Quiescent Current (Pulse Frequency Modulation)
570kHz Switching Frequency
Programmable Soft-Start Time
Up to 85% Efficiency at 5mA Light Load …
