ILC6377SO-50 datasheet(1/11 Pages) IMPALA

Teilenummer	ILC6377SO-50

Bauteilbeschribung	0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN

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Hersteller	IMPALA [Impala Linear Corporation]

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Impala Linear Corporation

1

(408) 574-3939

www.impalalinear.com

June 1999

ILC6377 1.3

The ILC6377 is a 95% efficient, 300kHz step-down DC-DC

converter in an SO-8 package; capable of delivering 500mA

output current. The device is also capable of driving an

external FET for higher output current applications.

The ILC6377 uses a unique p-channel architecture with

built-in charge pump to maintain low on-resistance, even at

low input voltages. At high or normal currents the ILC6377

operates in PWM mode with 300kHz operating frequency.

When the load current drops and the device hits approxi-

mately 17% duty cycle, it automatically switches over to

PFM or pulse skipping mode. PFM (pulse frequency mod-

ulation) mode of operation extends efficiency at light loads.

Start-up is controlled via an external soft-start capacitor. The

device will automatically re-enter start-up mode when an

output current overload condition is sensed; thus providing

automatic short-circuit protection. Voltage lockout prevents

faulty operation below the minimum operating voltage level.

In shutdown, the ILC6377 consumes only 1.5mA current.

The ILC6377SO-XX offers fixed 3.3V or 5V ouput while

ILC6377SO-Adj allows adjustable output. Both versions of

ILC6377 are available in an SO-8 surface mount package.

! ±2.5% accurate output voltages

! Guaranteed 500mA output current

! 95% efficiency

! 55mA no load battery input current

! 1.5mA shutdown current

! Built in short circuit and overcurrent protection

! Undervoltage lockout and soft-start

! External transistor drive available for higher Iout

! 300kHz operation

! Automatic switchover to PFM mode at low

currents for longest battery life

! Fixed 3.3V or 5V or adjustable output

! SO-8 package

! Cellular Phones

! Palmtops and PDAs

! Portable Instrumentation

! Buck Converter for Industrial / Networking Applications

PWM /PFM

P rotection

LX

GND

EXT1

RAMP WAVE

VIN

VOUT

P_BST

GATE

DRIV ER

GENERATOR,

OSCILLATOR

CONTROLLER

+

-

PWM

Comp

EXT2

+

-

Error

Amp

1

5

4

6

3

2

7

8

S/ D,

So ftstar t,

Vref

S/D,

Vref

with

Soft-

start

ILC6377

(TOP VIE W)

3

45

1

2

6

7

8

L X

FB

EXT1

S/D,

GND

P_BST

EXT2

V

IN

ILC6377SO- Adj

C

SS

SO- 8 Package

ILC6377

(TOP VIE W)

3

L X

V

OUT

EXT1

45

S/D,

GND

1

2

6

7

8

P_BST

EXT2

V

IN

C

SS

SO-8 Package

ILC6377SO- XX

Ordering Information

ILC6377SO-33

3.3V, 300 kHz step-down PWM/PFM converter

ILC6377SO-50

5V, 300 kHz step-down PWM/PFM converter

ILC6377SO-Adj

Adjustable, 300 kHz step-down PWM/PFM converter

Symbol

Function

1

VIN

Power Supply

2

EXT2

External gate drive pin (low when

P-Ch FET is ON)

3

P-BST

P-Ch gate boost

4

S/D

Softstart, Vref

Shutdown, also soft-start capacitor

pin and Vref output

5

VOUT/FB

Output voltage sense pin for

ILC6377SO-XX; 1V feedback for

ILC6377SO adj

6

GND

Ground connection

7

EXT1

External gate drive pin (low when

P-Ch FET is on)

8

LX

Inductor switch pin

ILC6377

0.5A, 300kHz, SO-8 PWM/PFM Step Down

Converter with Shutdown

Impala Linear Corporation

General Description

Features

Applications

Block Diagram

Pin Package Configurations

Pin Description

Ähnliche Beschreibung - ILC6377SO-50

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