RT8800 데이터 시트보기 (PDF) - Richtek Technology

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RT8800

General Purpose 2/3-Phase PWM Controller for High-Density Power Supply

Richtek Technology 

RT8800/B

General Purpose 2/3-Phase PWM Controller for High-Density

Power Supply

General Description

Features

The RT8800/B are general purpose multi-phase

synchronous buck controllers dedicating for high density

power supply regulation. The parts implement 2, and 3

buck switching stages operating in interleaved phase set

automatically. The output voltage is regulated and

controlled following the input voltage of FB pin. With such

a single analog control, the RT8800/B provide a simple,

flexible, wide-range and extreme cost-effective high-

density voltage regulation solutions for various high-density

power supply application. The RT8800/B multi-phase

architecture provide high output current while maintaining

low power dissipation on power devices and low stress

on input and output capacitors. The high equivalent

operating frequency also reduces the component

dimension and the output voltage ripple in load transient.

RT8800/B implement both voltage and current loops to

achieve good regulation, response and power stage

thermal balance. The RT8800/B apply the time sharing

DCR current sensing technology newly as well; with such

a topology, the RT8800/B extract the DCR of output

inductor as sense component to deliver a more precise

load line regulation and better thermal balance capability.

Moreover, the parts monitor the output voltage for over-

current and over-voltage protection; Soft-start and

programmable under-voltage lockout are also provided to

assure the safety of power system.

Applications

Desktop CPU core power

Low Output Voltage, High power density DC-DC

Converters

Voltage Regulator Modules

Marking Information

For marking information, contact our sales representative

directly or through a RichTek distributor located in your

area, otherwise visit our website for detail.

5V Power Supply Voltage

2/3-Phase Power Conversion with Automatic Phase

Selection (RT8800 : 2/3-Phase, RT8800B : 2-Phase)

Output Voltage Controlled by External Reference

Voltage

Precise Core Voltage Regulation

Power Stage Thermal Balance by DCR Current

Sensing

Extreme Low-Cost, Lossless Time Sharing Current

Sensing

Internal Soft-start

Hiccup Mode Over-Current Protection

Over-Voltage Protection

Adjustable Operating Frequency and Typical at

300kHz Per Phase

Power Good indication

Small 16-Lead VQFN Package (For RT8800 only)

RoHS Compliant and 100% Lead (Pb)-Free

Ordering Information

RT8800/B

Package Type

QV : VQFN-16L 3x3 (V-Type)

S : SOP-16

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

2-Phase

2/3-Phase

Note :

RichTek Pb-free and Green 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.

`100% matte tin (Sn) plating.

All brand name or trademark belong to their owner respectively

DS8800/B-06 March 2007

www.richtek.com

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