General Description

The RT6542A PWM controller provides high efficiency,

excellent transient response, and high DC output accuracy

needed for stepping down high voltage batteries to

generate low voltage CPU core, I/O, and chipset RAM

supplies in notebook computers.

The RT6542A supports on chip voltage programming

function between 0.85V and 1.05V by controlling GX digital

inputs.

The constant-on-time PWM control scheme handles wide

input/output voltage ratios with ease and provides 100ns

“instant-on” response to load transients while maintaining

a relatively constant switching frequency.

The RT6542A achieves high efficiency at a reduced cost

by eliminating the current-sense resistor found in

traditional current-mode PWMs. Efficiency is further

enhanced by its ability to drive very large synchronous

rectifier MOSFETs and enter diode emulation mode at

light load condition. The buck conversion allows this device

to directly step down high voltage batteries at the highest

possible efficiency. The RT6542A is intended for CPU core,

chipset, DRAM, or other low voltage supplies as low as

0.7V.

The RT6542A is available in a WDFN-14L 3x2 package.

Features

 Intel Cannon VR Support

 Built-in 1 Reference Voltage

 2-Bit Programmable Output Voltage with Integrated

Transition Support

 Support Intel LPM (Low-Power Mode) Feature

 4700ppm/°C Programmable Current Limit by Low-

Side RDS(ON) Sensing

 3V to 26V Battery Input Range

 Internal Voltage Ramp Soft-Start Control

 Drives Large Synchronous Rectifier FETs

 Integrated Boost Switch

 Over/Under-Voltage Protection

 Thermal Shutdown

 Power Good Indicator

 RoHS Compliant and Halogen Free

 Tiny 14-Lead WDFN Package

Applications

 Notebook Computers

 CPU/GPU Core Supply

 Chipset/RAM Supply

 Generic DC-DC Power Regulator

RT6542AGQW属于集成电路（IC） > PMIC - 稳压器 - DC DC 开关式控制器。立绮科技制造生产的RT6542AGQWDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。