L6997 datasheet(1/23 Pages) STMICROELECTRONICS

部件名	L6997

功能描述	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS

PDF	23 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 23 page

1/23

L6997

April 2003

FEATURES

s

FROM 3V TO 5.5V VCC RANGE.

s

MINIMUM OUTPUT VOLTAGE AS LOW AS

0.6V.

s

1V TO 28V INPUT VOLTAGE RANGE.

s

CONSTANT ON TIME TOPOLOGY ALLOWS.

OPERATION WITH VERYLOW AND HIGH

DUTY CYCLES.

s

VERY FAST LOAD TRANSIENTS.

s

0.6V, ±1% VREF.

s

SELECTABLE SINKING MODE.

s

LOSSLESS CURRENT LIMIT, AVAILABLE

ALSO IN SINKING MODE

s

REMOTE SENSING.

s

OVP,UVP LATCHED PROTECTIONS.

s

600

µA TYP QUIESCENT CURRENT.

s

POWER GOOD AND OVP SIGNALS.

s

PULSE SKIPPING AT LIGTH LOADS.

s

94% EFFICIENCY FROM 3.3V TO 2.5V.

APPLICATIONS

s

NETWORKING.

s

DC/DC MODULES.

s

DISTRIBUTED POWER.

s

MOBILE APPLICATIONS.

s

CHIP SET, CPU, DSP AND MEMORIES SUPPLY.

DESCRIPTION

The device is a high efficient solution for networking

dc/dc modules and mobile application compatible

with 3.3V bus and 5V bus.

It's able to regulate an output voltage as low as 0.6V.

The constant on time topology assures fast load tran-

sient response. The embedded voltage feed-forward

provides nearly constant switching frequency opera-

tion.

An integrator can be introduced in the control loop to

reduce the static output voltage error.

The remote sensing improves the static and dynamic

regulation, recovering the wires voltage drop.

Pulse skipping technique reduces power consump-

tion at light loads. Drivers current capability allows

output currents in excess of 20A.

TSSOP20

ORDERING NUMBERS: L6997D

L6997DTR

STEP DOWN CONTROLLER

FOR LOW VOLTAGE OPERATIONS

MINIMUM COMPONENT COUNT APPLICATION

L6997

SHDN

3.3V

INT

VSENSE

OVP

Vref

GND

GNDSENSE

VFB

SS

OSC

0.6V

PGOOD

PGND

LGATE

PHASE

HGATE

ILIM

BOOT

Rilim

Css

Cvref

HS

LS

Rin1

Rin2

Cin

Cboot

Dboot

L

Cout

Ro1

Ro2

DS

类似零件编号 - L6997

制造商	部件名	数据表	功能描述
STMicroelectronics	L6997S	515Kb / 30P	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS Jun-2004
STMicroelectronics	L6997STR	515Kb / 30P	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS Jun-2004

More results

类似说明 - L6997

制造商	部件名	数据表	功能描述
Maxim Integrated Produc...	MAX1637	211Kb / 20P	Miniature, Low-Voltage, Precision Step-Down Controller 19-1321; Rev 1; 2/98
STMicroelectronics	L6997S	515Kb / 30P	STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS Jun-2004
Texas Instruments	TPS53124	719Kb / 22P	Dual Synchronous Step-Down Controller For Low-Voltage Power Rails
	TPS53114	789Kb / 20P	SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
	TPS53126	979Kb / 30P	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
	TPS53125	462Kb / 22P	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
	TPS53127	482Kb / 23P	DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
	TPS53015	864Kb / 21P	Single Synchronous Step-down Controller for Low Voltage Power Rails
Sipex Corporation	SP6121CN-L	1Mb / 42P	Low Voltage, Synchronous Step Down PWM Controller
Texas Instruments	TPS53015	855Kb / 22P	Single Synchronous Step-down Controller for Low Voltage Power Rails