L4973 datasheet(1/27 Pages) STMICROELECTRONICS

номер детали	L4973

подробное описание детали	3.5A step down switching regulator

PDF	27 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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May 2007

Rev 17

1/27

27

L4973

3.5A step down switching regulator

Features

■ Up to 3.5A step down converter

■ Operating input voltage from 8V to 55V

■ 3.3V and 5.1V (±1%) fixed output, and

adjustable outputs from:

– 0.5V to 50V (3.3 type)

– 5.1V to 50V (5.1 type)

■ Frequency adjustable up to 300kHz

■ Voltage feed forward

■ Zero load current operation (min 1mA)

■ Internal current limiting (pulse by pulse and

HICCUP mode)

■ Precise 5.1V (1.5%) reference voltage

externally available

■ Input/output synchronization function

■ Inhibit for zero current consumption (100mA

typ. at VCC = 24V)

■ Protection against feedback disconnection

■ Thermal shutdown

■ Output over voltage protection

■ Soft start function

Description

The L4973 is a step down monolithic power

switching regulator delivering 3.5A at fixed

voltages of 3.3V or 5.1V and using a simple

external divider output adjustable voltage up to

50V. Realized in BCD mixed technology, the

device uses an internal power D-MOS transistor

(with a typical RDS(on) of 0.15Ω) to obtain very

high efficiency and very fast switching times.

Switching frequency up to 300KHz are achievable

(the maximum power dissipation of the packages

must be observed).

A wide input voltage range between 8V to 55V

and output voltages regulated from 3.3V to 40V

cover the majority of the today applications.

Features of this new generation of DC-DC

converter includes pulse by pulse current limit,

hiccup mode for output short circuit protection,

voltage feed forward regulation, soft start,

input/output synchronization, protection against

feedback loop disconnection, inhibit for zero

current consumption and thermal shutdown.

Packages available are in plastic dual in line, DIP-

18 (12+3+3) for standard assembly, and SO20

(12+4+4) for SMD assembly.

DIP-18 (12+3+3)

SO-20 (12+4+4)

www.st.com

Figure 1.

Internal schematic diagram

L4973

V

CC (8V to 55V)

CIN

C2

ROSC

COSC

D1

L1

COUT

VO(3.3V or 5.1V)

CBOOT

4,5,6,10

13,14,15

7

9

8

1

11

3

D97IN554A

17

RCOMP

CCOMP

CSS

2

16

12

Аналогичный номер детали - L4973

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Аналогичное описание - L4973

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