L5970ADTR Datasheet

IC型號(hào)：
L5970ADTR
PDF描述：
1.5A SWITCH STEP DOWN SWITCHING REGULATOR
文件大小：
137.55KB
PDF頁(yè)數(shù)：
11頁(yè)
芯片廠家：
STMICROELECTRONICS

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L5970AD

1.5A SWITCH STEP DOWN SWITCHING REGULATOR

鈻?/div>

General Features

1.5A INTERNAL SWITCH

OPERATING INPUT VOLTAGE FROM 4.4V TO 36V

3.3V / (鹵2%) REFERENCE VOLTAGE

OUTPUT VOLTAGE ADJUSTABLE FROM

1.235V TO 35V

LOW DROPOUT OPERATION: 100% DUTY

CYCLE

500KHz INTERNALLY FIXED FREQUENCY

VOLTAGE FEEDFORWARD

ZERO LOAD CURRENT OPERATION

INTERNAL CURRENT LIMITING

INHIBIT FOR ZERO CURRENT

CONSUMPTION

SYNCHRONIZATION

PROTECTION AGAINST FEEDBACK

DISCONNECTION

THERMAL SHUTDOWN

Figure 1. Package

SO-8

Table 1. Order Codes

Part Number

L5970AD

L5970ADTR

Package

SO-8

SO-8 in Tape & Reel

Description

1.1 APPLICATIONS:

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CONSUMER: STB, DVD, TV, VCR,CAR

RADIO, LCD MONITORS

鈻?/div>

NETWORKING: XDSL, MODEMS,DC-DC

MODULES

鈻?/div>

COMPUTER: PRINTERS, AUDIO/GRAPHIC

CARDS, OPTICAL STORAGE, HARD DISK

DRIVE

鈻?/div>

INDUSTRIAL: CHARGERS, CAR BATTERY

DC-DC CONVERTERS

The L5970AD is a step down monolithic power

switching regulator with a switch current limit of 1.5A

so it is able to deliver more than 1A DC current to the

load depending on the application conditions.

The output voltage can be set from 1.235V to 35V.

The device uses an internal P-Channel D-MOS tran-

sistor (with a typical R

DSON

of 200m鈩? as switching

element to avoid the use of bootstrap capacitor and

guarantee high efficiency.

An internal oscillator fixes the switching frequency at

500KHz to minimize the size of external components.

Having a minimum input voltage of 4.4V only, it is

particularly suitable for 5V bus, available in all com-

puter related applications.

Pulse by pulse current limit with the internal frequen-

cy modulation offers an effective constant current

short circuit protection.

Figure 2. Test and Application Circuit

3.3V

VIN = 4.4V to 35V

VREF

VCC

SYNC.

10碌F

35V

CERAMIC

COMP

22nF

220pF

4.7K

INH

OUT

L1 15碌H

STPS2L25U

GND

3.3K

VOUT=3.3V

L5970AD

5.6K

330碌F

10V

D05IN1530

March 2005

Rev. 1

1/11

制造商
STMicroelectronics
產(chǎn)品種類(lèi)
開(kāi)關(guān)變換器、穩(wěn)壓器與控制器
封裝
Reel

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L5970ADTR Datasheet

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