PM6675STR datasheet(1/53 Pages) STMICROELECTRONICS

部件名	PM6675STR

功能描述	High efficiency step-down controller with embedded 2 A LDO regulator

PDF	53 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 53 page

February 2008

Rev 1

1/53

PM6675S

High efficiency step-down controller

with embedded 2 A LDO regulator

Features

■ Switching section

– 4.5 V to 28 V input voltage range

– 0.6 V, ±1 % voltage reference

– Selectable 1.5 V fixed output voltage

– Adjustable 0.6 V to 3.3 V output voltage

– 1.237 V ±1 % reference voltage available

– Very fast load transient response using

constant on-time control loop

–No RSENSE current sensing using low side

MOSFETs' RDS(ON)

– Negative current limit

– Latched OVP and UVP

– Soft-start internally fixed at 3 ms

– Selectable pulse skipping at light load

– Selectable No-Audible (33 kHz) pulse skip

mode

– Ceramic output capacitors supported

– Output voltage ripple compensation

– Output soft-end

■ LDO regulator section

– Adjustable 0.6 V to 3.3 V output voltage

– Selectable ±1 Apk or ±2 Apk current limit

– Dedicated power-good signal

– Ceramic output capacitors supported

– Output soft-end

Applications

■ Notebook computers

■ Graphic cards

■ Embedded computers

Description

The PM6675S device consists of a single high

efficiency step-down controller and an

independent Low Drop-Out (LDO) linear

regulator.

The Constant On-Time (COT) architecture

assures fast transient response supporting both

electrolytic and ceramic output capacitors. An

embedded integrator control loop compensates

the DC voltage error due to the output ripple.

A selectable low-consumption mode allows the

highest efficiency over a wide range of load

conditions. The low-noise mode sets the minimum

switching frequency to 33 kHz for audio-sensitive

applications.

The LDO linear regulator can sink and source up

to 2 Apk. Two fixed current limits (±1 A-±2 A) can

be chosen.

An active soft-end is independently performed on

both the switching and the linear regulators

outputs when disabled.

VFQFPN-24 4x4

www.st.com

Table 1.

Device summary

Order codes

Package

Packaging

PM6675S

VFQFPN-24 4x4 (exposed pad)

Tube

PM6675STR

Tape and reel

类似零件编号 - PM6675STR

制造商	部件名	数据表	功能描述
STMicroelectronics	PM6675	656Kb / 47P	Very fast load transient response using constant on-time control loop 31-Jan-2007
	PM6675A	265Kb / 15P	Latched OVP and UVP 11-Oct-2006
	PM6675AS	2Mb / 48P	High efficiency step-down controller with embedded 2 A LDO regulator 19-Feb-2008
	PM6675ASTR	2Mb / 48P	High efficiency step-down controller with embedded 2 A LDO regulator 19-Feb-2008

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类似说明 - PM6675STR

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