L4978D Datasheet

IC型號：
L4978D
PDF描述：
2A STEP DOWN SWITCHING REGULATOR
文件大?。?/label>
138.13KB
PDF頁數(shù)：
12頁
芯片廠家：
STMICROELECTRONICS

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L4978

2A STEP DOWN SWITCHING REGULATOR

UP TO 2A STEP DOWN CONVERTER

OPERATING INPUT VOLTAGE FROM 8V TO

55V

PRECISE 3.3V (鹵1%) INTERNAL REFER-

ENCE VOLTAGE

OUTPUT VOLTAGE ADJUSTABLE FROM

3.3V TO 50V

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 L4978 is a step down monolithic power

switching regulator delivering 2A at a voltage be-

tween 3.3V and 50V (selected by a simple exter-

nal divider). Realized in BCD mixed technology,

the device uses an internal power D-MOS transis-

tor (with a typical Rdson of 0.25鈩? to obtain very

high efficency and high switching speed.

TYPICAL APPLICATION CIRCUIT

Vi=8V to 55V

20K

220碌F

63V

220nF

2.7nF

Minidip

SO16W

ORDERING NUMBERS:

L4978 (Minidip)

L4978D (SO16)

A switching frequency up to 500KHz is achiev-

able (the maximum power dissipation of the pack-

ages must be observed).

A wide input voltage range between 8V to 55V

and output voltages regulated from 3.3V to 50V

cover the majority of today鈥檚 applications.

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 SO16W

for SMD assembly.

L4978

126碌H

(77120)

SB560

330碌F

=3.3V/2A

100nF

9.1K

22nF

100nF

D98IN837A

May 2000

1/12

其它有關(guān)文件
L4978 View All Specifications
標(biāo)準(zhǔn)包裝
49
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
3.3 V ~ 50 V
輸入電壓
8 V ~ 55 V
PWM 型
-
頻率 - 開關(guān)
100kHz ~ 300kHz
電流 - 輸出
2A
同步整流器
無
工作溫度
-40°C ~ 150°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
497-5794-5

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