Datasheet > L4985

L4985

更新时间： 2024-11-05 23:43:47

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L4985 数据手册

L4985

HIGH EFFICIENCY SWITCHING REGULATOR

PRODUCT PREVIEW

OPERATING INPUT VOLTAGE:

FROM 4.5V TO 21V

MULTIPOWER BCD TECHNOLOGY

HIGHEFFICIENCY 3A STEP DOWN CONVERTER

—

3A @ 3.3V OUTPUT VOLTAGE FROM 4.5V

INPUT VOLTAGE

ADJUSTABLE OUTPUT VOLTAGE

FROM 1.28V

GATE DRIVER FOR SYNCHRONOUS

RECTIFICATION

—

100% MAXIMUM DUTY CYCLE

INTERNAL CURRENT LIMIT

SOFT START, RESET SIGNAL,

THERMAL SHUTDOWN

POWERDIP 16+2+2

SO20

AUXILIARY CONVERTER WITH 40V

OPEN DRAIN SWITCH DELIVERING 5W

@ V_IN= 12V

ORDERING NUMBERS: L4985 (Powerdip)

L4985D (SO20)

—

1.7A PEAK CURRENT INTERNALLY

LIMITED (TYP)

POWER MANAGEMENT

Step Down Converter Section

The stepdown section, delivering to the load up to

3A current, at an output voltage adjustable from

1.28V up to 16V, works in voltage mode, fixed fre-

quency,with no limitation on the max duty cycle.

DESCRIPTION

This section has been designed to maximise the

efficiency minimising the conduction losses and

the quiescent current.

An internal step-up converter using a small chip

inductor and a filter capacitor provides voltage

and energy the gate driver of the internal N-chan-

nel DMOS transistor of 0.1Ω typ of R_dson, and the

driver of an external DMOS transistor that should

require no more than 30nC of gate charge, at

100KHz.

This high efficiency DC-DC converter is a mono-

lithic device developed to generate all the volt-

ages required in multioutputs DC-DC converters,

in particular when the supply voltage is a battery,

and isolation is not needed.

Designed to start to operate at an input voltage as

low as 4.5V up to 21V, the device takes the ad-

vantages offered by our proprietary BCD Mul-

tipower technology to deliver 3A to the load on

the stepdown section, and to manage 1.5A peak

current on the open drain section.

The gate driver pin can be left open if the use of a

Schottkydiode is preferred.

An internal pulse by pulse current limiting protects

the device it self and the load from overload and

short circuit conditions.

The packages proposed are in plastic dual in line,

Powerdip 20 (16+2+2) for standard assembly,

and SO20L for SMD assembly.

A reset block, monitoring the feedback voltage,

with an programmable reset delay time, gener-

ates a reset signal for the microprocessor.

The reset output is an open drain.

This device is constitueed by two major sections:

one section is a stepdown regulator, and the

other one is a flexible regulator with open drain

output DMOS transistor, source grounded, for fly-

back/forward topologies for multioutputs, or step-

up topology when a single voltage higher than the

supply one is requested.

Moreover, the DIS1 pin, active low, will inhibit the

whole device, reducing to leakage only the cur-

rent consumption from the battery.

1/23

March 1995

This is advanced information on a new product now in developmentor undergoing evaluation. Details are subject to change without notice.

12 3 4 5 6 7...23

中文翻译

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与L4985相关器件

型号	品牌	获取价格	描述	数据表
L4985D	ETC	获取价格	Voltage-Mode SMPS Controller
L4986	STMICROELECTRONICS	获取价格	连续导通模式（CCM）PFC控制器具有高压启动和“电源正常”功能
L4987	STMICROELECTRONICS	获取价格	VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG
L4987CPT120	STMICROELECTRONICS	获取价格	VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG
L4987CPT120TR	STMICROELECTRONICS	获取价格	12V FIXED POSITIVE LDO REGULATOR, 0.7V DROPOUT, PSSO4, LEAD FREE, PPAK-5
L4987CPT30	STMICROELECTRONICS	获取价格	VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG
L4987CPT30TR	STMICROELECTRONICS	获取价格	3V FIXED POSITIVE LDO REGULATOR, 0.7V DROPOUT, PSSO4, LEAD FREE, PPAK-5
L4987CPT33	STMICROELECTRONICS	获取价格	3.3V FIXED POSITIVE LDO REGULATOR, 0.7V DROPOUT, PSSO4, PPAK-5
L4987CPT50	STMICROELECTRONICS	获取价格	VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG
L4987CPT87	STMICROELECTRONICS	获取价格	VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG

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