L6997STR Datasheet

IC型號：
L6997STR
PDF描述：
STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS
文件大?。?/label>
518.63KB
PDF頁數(shù)：
30頁
芯片廠家：
STMICROELECTRONICS

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L6997S

STEP DOWN CONTROLLER

FOR LOW VOLTAGE OPERATIONS

鈻?/div>

Features

FROM 3V TO 5.5V V

RANGE

MINIMUM OUTPUT VOLTAGE AS LOW AS

0.6V

1V TO 35V INPUT VOLTAGE RANGE

CONSTANT ON TIME TOPOLOGY

VERY FAST LOAD TRANSIENTS

0.6V, 鹵1% VREF

SELECTABLE SINKING MODE

LOSSLESS CURRENT LIMIT, AVAILABLE

ALSO IN SINKING MODE

REMOTE SENSING

OVP,UVP LATCHED PROTECTIONS

600碌A(chǔ) TYP QUIESCENT CURRENT

POWER GOOD AND OVP SIGNALS

PULSE SKIPPING AT LIGTH LOADS

94% EFFICIENCY FROM 3.3V TO 2.5V

Figure 1. Package

TSSOP20

Table 1. Order Codes

Part Number

L6997S

L6997STR

Package

TSSOP20

Tape & Reel

Description

鈻?/div>

Applications

NETWORKING

鈻?/div>

DC/DC MODULES

鈻?/div>

DISTRIBUTED POWER

鈻?/div>

MOBILE APPLICATIONS

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CHIP SET, CPU, DSP AND MEMORIES

SUPPLY

Figure 2. Minimum Component Count Application

Rin2

Rin1

The device is a high efficient solution for networking

dc/dc modules and mobile applications compatible

with 3.3V bus and 5V bus.

It's able to regulate an output voltage as low as 0.6V.

The constant on time topology assures fast load tran-

sient response. The embedded voltage feed-forward

provides nearly constant switching frequency opera-

tion in spite of a wide input voltage range.

An integrator can be introduced in the control loop to

reduce the static output voltage error.

The remote sensing improves the static and dynamic

regulation, recovering the wires voltage drop.

Pulse skipping technique reduces power consump-

tion at light loads. Drivers current capability allows

output currents in excess of 20A.

3.3V

Cin

VCC

VDR

OSC

BOOT

HGATE

Dboot

Cboot

0.6V

Ro1

PHASE

PGOOD

OVP

LGATE

Ro2

ILIM

Rilim

L6997S

PGND

GND

GNDSENSE

Cout

Css

VSENSE

INT

VFB

SHDN

Vref

Cvref

June 2004

REV. 1

1/30

其它有關(guān)文件
L6997S View All Specifications
產(chǎn)品培訓(xùn)模塊
Step-Down DC/DC Controllers with External MOSFETS and Monolithic Step-Down Regulators
標(biāo)準(zhǔn)包裝
1
類別
集成電路 (IC)
家庭
PMIC - 穩(wěn)壓器 - DC DC 切換控制器
系列
-
PWM 型
控制器
輸出數(shù)
1
頻率 - 最大
1MHz
占空比
94%
電源電壓
3 V ~ 5.5 V
降壓
是
升壓
無
回掃
無
反相
無
倍增器
無
除法器
無
Cuk
無
隔離
無
工作溫度
0°C ~ 85°C
封裝/外殼
20-TSSOP（0.173"，4.40mm 寬）
包裝
Digi-Reel®
其它名稱
497-4225-6

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