RT8120 查看數據表（PDF） - Richtek Technology

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RT8120

Single-Phase Synchronous Buck PWM Controller

Richtek Technology 

®

RT8120

Single-Phase Synchronous Buck PWM Controller

General Description

The RT8120 is a single-phase synchronous buck PWM

DC/DC controller designed to drive two N-MOSFET. It

provides a highly accurate, programmable output voltage

precisely regulated to low voltage requirements with an

internal 0.8V ±1% ( option for 0.6V ±1.5%) reference. The

RT8120 uses a single feedback loop voltage mode PWM

control for fast transient response. An oscillator with fixed

frequency 300kHz reduces the external inductor and

capacitor component size for saving PCB board area. The

RT8120 provides fast transient response to satisfy high

current output applications while minimizing external

components. It is suitable for high performance graphic

processors, DDR and VTT power. The RT8120 incorporates

an externally compensated error amplifier and an internal

soft-start and output enable. The RT8120 comes in

SOP-8 and SOP-8 (Exposed Pad) packages.

Ordering Information

RT8120

Package Type

S : SOP-8

SP : SOP-8 (Exposed-Pad-Option 1)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Reference Voltage

A/C : 0.6V

B/D : 0.8V

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.

Features

z Wide Input Voltage Range : 3V to 13.2V

z Embedded Switching Boot Diode

z 0.8V ±1%, 0.6V ±1.5% Internal Reference

z Shoot-Through Protection and Short Pulse Free

Technology for Gate Drivers

z Fixed Frequency 300kHz

z Internal Soft-Start

z Over Current Protection by Sensing MOSFET RDS(ON)

z Enable/Shutdown Control

z Drives Two N-MOSFETs

z Full Duty Cycle : 0% to 85%

z Fast Transient Response

z Voltage Mode PWM Control with External

Feedback Loop Compensation

z Pinless LGATE Over Current Setting (LGOCS)

z Under Voltage Protection

z SOP-8 and SOP-8 (Exposed Pad) Packages

z RoHS Compliant and Halogen Free

Applications

z System (Graphic, MB) with 5V or 12V Power

z Graphic Cards (AGP 8X, 4X, PCI Express*16)

z 3.3V to 12V Input DC/DC Regulators

z Low Voltage Distributed Power Supplies

Pin Configurations

(TOP VIEW)

BOOT

UGATE 2

GND

3

LGATE/OCSET 4

8

PHASE

7

COMP/EN

6

FB

5

VCC

SOP-8

BOOT

UGATE

GND

LGATE/OCSET

8

2

7

GND

3

6

9

4

5

PHASE

COMP/EN

FB

VCC

SOP-8 (Exposed Pad)

Copyright ©2013 Richtek Technology Corporation. All rights reserved.

DS8120-08 September 2013

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

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