PM6675AS datasheet(1/48 Pages) STMICROELECTRONICS

部件名	PM6675AS

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

PDF	48 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 48 page

February 2008

Rev 1

1/48

PM6675AS

High efficiency step-down controller

with embedded 2 A LDO regulator

Features

■ Switching section

– 4.5 V to 36 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

■ Industrial application on 24 V

■ Graphic cards

■ Embedded computer systems

Description

The PM6675AS 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.

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 limit

(±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

Table 1.

Device summary

Order codes

Package

Packaging

PM6675AS

VFQFPN-24 4x4 (exposed pad)

Tube

PM6675ASTR

Tape and reel

www.st.com

类似零件编号 - PM6675AS

制造商	部件名	数据表	功能描述
STMicroelectronics	PM6675A	265Kb / 15P	Latched OVP and UVP 11-Oct-2006

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