RT8202B 查看數據表（PDF） - Richtek Technology

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RT8202B

Single Synchronous Buck Controller

Richtek Technology 

®

RT8202/A/B

Single Synchronous Buck Controller

General Description

Features

The RT8202/A/B 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 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 RT8202/A/B 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. The buck conversion allows this device

to directly step down high voltage batteries for the highest

possible efficiency. The RT8202/A/B is intended for CPU

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

low as 0.75V. RT8202 is available in WQFN-16L 4x4,

RT8202A is available in WQFN-16L 3x3 and RT8202B is

available in WQFN-14L 3.5x3.5 packages.

 Ultra-High Efficiency

 Resistor Programmable Current Limit by Low Side

RDS(ON) Sense (Lossless Limit) or Sense Resistor

(High Accuracy)

 Quick Load Step Response within 100ns

 1% VOUT Accuracy over Line and Load

 Adjustable 0.75V to 3.3V Output Range

 4.5V to 26V Battery Input Range

 Resistor Programmable Frequency

 Over/Under Voltage Protection

 2 Steps Current Limit During Soft-Start

 Drives Large Synchronous-Rectifier FETs

 Power Good Indicator

 RoHS Compliant and 100% Lead (Pb)-Free

Applications

 Notebook Computers

 CPU Core Supply

 Chipset/RAM Supply as Low as 0.75V

Pin Configurations

Ordering Information

RT8202/A/B

(TOP VIEW)

Package Type

QW : WQFN-16L 4x4 (W-Type) (RT8202)

QW : WQFN-16L 3x3 (W-Type) (RT8202A)

QW : WQFN-14L 3.5x3.5 (W-Type) (RT8202B)

Lead Plating System

P : Pb Free

G : Green (Halogen Free and Pb Free)

Note :

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

16 15 14 13

VOUT 1

VDD 2

FB 3

PGOOD 4

GND

17

12 UGATE

11 PHASE

10 OC

9 VDDP

5678

WQFN-16L 4x4/WQFN-16L 3x3

TON 2

VOUT 3

VDD 4

FB 5

PGOOD 6

1

14

GND

15

7

8

13 UGATE

12 PHASE

11 OC

10 VDDP

9 LGATE

WQFN-14L 3.5x3.5

Copyright ©2014 Richtek Technology Corporation. All rights reserved.

DS8202/A/B-07 April 2014

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

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