Features

• Constant-On-Time Control with fast transient

response

• Input Voltage Range: 2.85V to 26V with

external bias, or 4.2V to 26V with internal bias.

• Output Voltage Range: 0.5V to 5.5V for

RS53428L, 0.6V to 5.5V for RS53428H. 90%

max duty cycle

• 12A continuous output current

• Excellent load and line regulations with 0.6%

voltage accuracy

• Differential Remote Sensing

• Mode Selection Between Pulse Skip and CCM

at Light Load

• Programmable soft-start time

• Programmable Switch Valley Current Limit

• Adjustable Switching Frequency: 300kHz,

500kHz, 800kHz and 1000kHz

• Non-latch OCP, UVP, UVLO and OTP. Latchoff

OVP

• 3mm x 4mm 21-Pin QFN Package

• RoHS compliant and Green

Applications

• Laptop/desktop computer

• Industrial applications

• Networking system

• Gaming Consoles and Graphic Cards

• TV Power

Description

The RS53428 is a high-power density, fully

integrated synchronous buck converter. It has a

wide input voltage range, and can support up to 12A

continuous output current at defined conditions.

LDO is integrated internally, which is very suitable

for single input supply conditions. External bias is

optional for maximizing efficiency. A differential

sensing scheme and an internal feedback reference

voltage achieve ±1% tolerance over full temperature

range and, in conjunction, they perform an excellent

line and load regulation.

Switching frequency can be easily adjusted from

300kHz, 500kHz, 800kHz, to 1000kHz. The

RS53428 uses Constant-On-Time control scheme

with fast transient response. Pure MLCC output

capacitors can be used to save space and cost.

RS53428 has full protection features including OCP,

NOCP, OVP, UVP and over temperature protection

(OTP).

The RS53428 is available in a 3mm x 4mm 21-Pin

QFN package.