L6910 データシートの表示（PDF） - STMicroelectronics

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L6910

ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION

STMicroelectronics 

L6910

L6910A

ADJUSTABLE STEP DOWN CONTROLLER

WITH SYNCHRONOUS RECTIFICATION

1 FEATURES

■ OPERATING SUPPLY VOLTAGE FROM 5V

TO 12V BUSES

■ UP TO 1.3A GATE CURRENT CAPABILITY

■ ADJUSTABLE OUTPUT VOLTAGE

■ N-INVERTING E/A INPUT AVAILABLE

■ 0.9V ±1.5% VOLTAGE REFERENCE

■ VOLTAGE MODE PWM CONTROL

■ VERY FAST LOAD TRANSIENT RESPONSE

■ 0% TO 100% DUTY CYCLE

■ POWER GOOD OUTPUT

■ OVERVOLTAGE PROTECTION

■ HICCUP OVERCURRENT PROTECTION

■ 200kHz INTERNAL OSCILLATOR

■ OSCILLATOR EXTERNALLY ADJUSTABLE

FROM 50kHz TO 1MHz

■ SOFT START AND INHIBIT

■ PACKAGES: SO-16 & HTSSOP16

2 APPLICATIONS

■ SUPPLY FOR MEMORIES AND TERMI-

NATIONS

■ COMPUTER ADD-ON CARDS

■ LOW VOLTAGE DISTRIBUTED DC-DC

■ MAG-AMP REPLACEMENT

3 DESCRIPTION

The device is a pwm controller for high performance

Figure 2. Block Diagram

PGOOD

VREF

SS

OSC

RT

EAREF

VCC OCSET

MONITOR

PROTECTION

& REF

OSC

E/A

+

-

PWM

-

+

May 2005

D03IN1509

COMP

Figure 1. Packages

SO-16 (Narrow)

HTSSOP16 (Exposed Pad)

Table 1. Order Codes

Part Number

Package

L6910

L6910TR

L6910A

SO-16

SO-16 in Tape & Reel

HTSSOP16

L6910ATR

HTSSOP16 in Tape & Reel

dc-dc conversion from 3.3V, 5V and 12V buses.

The output voltage is adjustable down to 0.9V;

higher voltages can be obtained with an external

voltage divider.

High peak current gate drivers provide for fast switch-

ing to the external power section, and the output

current can be in excess of 20A.

The device assures protections against load overcur-

rent and overvoltage. An internal crowbar is also pro-

vided turning on the low side mosfet as long as the

over-voltage is detected. In case of over-current de-

tection, the soft start capacitor is discharged and the

system works in HICCUP mode.

BOOT

UGATE

BOOT

LGATE

PGND

GND

VFB

Vin 5V to 12V

VO

Rev. 9

1/29

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