lx1682 Microsemi Corporation, lx1682 Datasheet

lx1682

Manufacturer Part Number

lx1682

Description

Voltage - Mode Pwm Controllers

Manufacturer

Microsemi Corporation

Datasheet

1.LX1682.pdf (9 pages)

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

lx1682C

Manufacturer:

LMI

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

lx1682CDM

Manufacturer:

LINFINITY

Quantity:

20 000

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Download datasheet (200Kb)

Rev. 1.1b,2005-03-09

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

pulse-width modulator controller ICs.

They are designed to implement a

flexible, low cost buck (step-down)

regulator supply with minimal external

components.

controller;

synchronous driver for higher efficiency.

means of a resistor divider to set the

voltage between 1.25V and 4.5V.

implemented without expensive current

sense resistors. Current is sensed using

the voltage drop across the R

MOSFET — sensing is delayed for 1µs

to eliminate MOSFET ringing errors.

The LX1681/1682 are monolithic,

The LX1681 is a non-synchronous

The output voltage is adjustable by

Short-circuit current limiting can be

0.1µF

GND

the

N.C.

LX1681 Non-Synchronous Controller

LX1681

LX1682

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

TDRV

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1681CDM-TR)

DS(ON)

1µF

D E S C R I P T I O N

has

BO OST

12V

0 to 70

of the

(°C)

SET

IRL3103S

1500µF

MBR2545

average power to the power elements

during short-circuit conditions.

200kHz for optimal cost and space.

for optimal start-up performance. Pulling

the soft-start pin to ground can disable

the LX1681/82.

board space. Optimized for 5V-to-3.3V

LX1681/82 can also be used for

converting 12V to 5V, 3.3V or other

voltages

eliminating the need for bulky heat sinks.

5µH

Linfinity Microelectronics Division

P R O D U C T H I G H L I G H T

Hiccup-mode fault protection reduces

Switching frequency is fixed at

Under-voltage lockout and soft-start

Small 8-pin SOIC packaging reduces

P A C K A G E O R D E R I N F O

Non-Synchronous

1500µF

5V-to-2.5V

Synchronous

Microsemi

UTPUT

with

OU T

high

conversion,

0.1µF

Voltage-Mode PWM Controllers

G ND

BDRV

efficiency,

LX1682 Synchronous Controller

RoHS Compliant / Pb-free

LX1682

Transition D/C: 0440

RODUCTION

LX1681CDM

LX1682CDM

Plastic SOIC

8-PIN

the

TDRV

1µF

ATA

5V to 3.3V Or Less Buck

Regulators

FPGA Supplies

Microprocessor Chipset Supplies

(e.g. Camino, Whitney, etc.)

Rambus

Hard Disk Drives

Computer Add-on Cards

Fixed 200kHz Switching Frequency

Constant Frequency Voltage-Mode

Control Requires NO External

Compensation

Hiccup-Mode Over-Current

Protection

High Efficiency

Output Voltage Set By Resistor

Divider

Under-Voltage Lockout

Soft-Start And Enable

Synchronous Rectification

(LX1682)

Non-Synchronous Rectification

(LX1681)

Small, 8-pin Surface Mount

Package

BOO ST

12V

SET

K E Y F E A T U R E S

A P P L I C A T I O N S

IRL3103S

1500µF

HEET

RIMM™ Supplies

IRL3103S

5µH

LX1681/1682

1500µF

OU T

Page 1

Related parts for lx1682

lx1682 Summary of contents

Page 1

... IRL3103S BDRV 1 1500µF 5µ SET MBR2545 LX1682 Synchronous Controller (°C) O UTPUT RoHS Compliant / Pb-free Non-Synchronous Synchronous Microsemi Linfinity Microelectronics Division LX1681/1682 RODUCTION ATA HEET ...

Page 2

... N.C. 3 GND 4 5 LX1681 DM P ACKAGE (Top View GND 3 BDRV 4 5 LX1682 DM P ACKAGE (Top View) RoHS / Pb-free 100% Matte Tin Lead Finish TDRV TDRV Page 2 ...

Page 3

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C otherwise noted. Test conditions: V =5V Parameter REFERENCE Reference Voltage OSCILLATOR Frequency Ramp Amplitude ERROR AMPLIFIER Input Resistance CURRENT SENSE Current Set V TRIP ...

Page 4

TM GENERAL DESCRIPTION The LX1681/82 are voltage-mode pulse-width modulation controller integrated circuits. The internal oscillator and ramp generator frequency is fixed at 200kHz. The devices have internal compensation, so that no external compensation is required. POWER UP and INITIALIZATION At ...

Page 5

TM OUTPUT INDUCTOR The output inductor should be selected to meet the requirements of the output voltage ripple in steady-state operation and the inductor current slew-rate during transient. The peak-to-peak output voltage ripple is: V ESR = RIPPLE where ( ...

Page 6

TM SOFT-START CAPACITOR (continued) The capacitor current to follow the SS-pin voltage is OUT = = OUT OUT where C is the output capacitance. The typical value of C OUT should be ...

Page 7

TM FET SELECTION (continued) Synchronous Rectification – Lower MOSFET The lower pass element can be either a MOSFET or a Schottky diode. The use of a MOSFET (synchronous rectification) will result in higher efficiency, but at higher cost than using ...

Page 8

... LX1681 SET V N. GND TDRV LX1682 GND BDRV TDRV R SET Q 2 Microsemi Linfinity Microelectronics Division LX1681/1682 D S ATA HEET SENSE V OUT ...

Page 9

Com RES 320k 20k 1 - Error Com plifier Com pensation ...

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