L5971D Datasheet

IC型號(hào)：
L5971D
PDF描述：
1.5A STEP DOWN SWITCHING REGULATOR
文件大?。?/label>
98.92KB
PDF頁(yè)數(shù)：
11頁(yè)
芯片廠家：
STMICROELECTRONICS

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L5971

1.5A STEP DOWN SWITCHING REGULATOR

UP TO 1.5A STEP DOWN CONVERTER

OPERATING INPUT VOLTAGE FROM 6.5V

TO 28V

PRECISE 1.26V (鹵1%) INTERNAL REFER-

ENCE VOLTAGE

OUTPUT VOLTAGE ADJUSTABLE FROM

1.26V TO 20V

SWITCHING FREQUENCY ADJUSTABLE UP

TO 500KHz

VOLTAGE FEEDFORWARD

ZERO LOAD CURRENT OPERATION

INTERNAL CURRENT LIMITING (PULSE-BY-

PULSE AND HICCUP MODE)

INHIBIT FOR ZERO CURRENT CONSUMP-

TION

PROTECTION AGAINST FEEDBACK DIS-

CONNECTION

THERMAL SHUTDOWN

SOFT START FUNCTION

DESCRIPTION

The L5971 is a step down monolithic power

switching regulator delivering 1.5A at a voltage

between 1.26V and 20V (selected by a simple

external divider). Realized in BCD mixed technol-

ogy, the device uses an internal power D-MOS

transistor (with a typical Rdson of 0.25鈩? to ob-

tain very high efficency and high switching speed.

TYPICAL APPLICATION CIRCUIT

Vi=6V to 28V

22K

3(4)

2(3)

1.2nF

47nF

Minidip

SO16W

ORDERING NUMBERS:

L5971 (Minidip)

L5971D (SO16)

A switching frequency up to 500KHz is achiev-

able (the maximum power dissipation of the pack-

ages must be observed).

Features of this new generations of DC-DC con-

verter include pulse-by-pulse current limit, hiccup

mode for short circuit protection, voltage feedfor-

ward regulation, soft-start, protection against

feedback loop disconnection, inhibit for zero cur-

rent consumption and thermal shutdown.

The device is available in plastic dual in line,

MINIDIP 8 for standard assembly, and SO16 for

SMD assembly.

Typical Applications:

- High efficiency step-down converter

- Portable computers

- Battery charger

- Distributed power

- PDAs and Mobile Comminicators

5(11)

8(14)

L5971

7(13)

4(5,6)

=2.5V/1.5A

30碌H

1(2) 6(12)

47碌F

30V

9.1K

22nF

100nF

STPS

3L40U

330碌F

D98IN832C

May 2000

1/11

標(biāo)準(zhǔn)包裝
50
類別
集成電路 (IC)
家庭
PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器
系列
-
類型
降壓（降壓）
輸出類型
可調(diào)式
輸出數(shù)
1
輸出電壓
1.26 V ~ 20 V
輸入電壓
6.5 V ~ 28 V
PWM 型
-
頻率 - 開關(guān)
100kHz ~ 300kHz
電流 - 輸出
1.5A
同步整流器
無(wú)
工作溫度
0°C ~ 125°C
安裝類型
表面貼裝
封裝/外殼
16-SOIC（0.295"，7.50mm 寬）
包裝
管件
供應(yīng)商設(shè)備封裝
16-SO W
其它名稱
497-1416-5

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