LX1734 データシートの表示（PDF） - Microsemi Corporation

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LX1734

1.0MHz Inverting DC/DC Converter

Microsemi Corporation 

LX1734

TM

®

1.0MHz Inverting DC/DC Converter

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 85°C and the following

test conditions: VIN = 5V

Parameter

Symbol

Test Conditions

LX1734

Units

Min Typ Max

Minimum Operating Voltage

VIN Under Voltage Lockout

Reference Voltage

Reference Voltage Line Regulation

NFB Pin Bias Current

Quiescent Current

Quiescent Current

Switching Frequency

Maximum Duty Cycle

Switch VCESAT

Switch Leakage Current

Switch Circuit Current Limit

High

Low

Shutdown Input Voltage

Bias

Current

VIN

UVLO

VNFB

INFB

IQ

ISHDN

VIN rising, regulator remains off

4.5V < VIN < 5.5V, TAMB > 25°C

(Regulator Not Switching, VNFB = -2V)

V < 0.28V

SD

IOUT = 5mA to 250mA

VSDH

VSDL

ISD

ISW = 600mA

VSW = 10V

Duty Cycle < 50%

Device Active

Device Disabled

VSD = 0.28V

V = 5V

SD

3.2

-1.205

0.8

82

700

2

-5

-1.235

-4

9

650

0.02

0.4

4.25

4.25

-1.255

18

-8

12

300

1.4

800

1

0.8

1.0

30

50

V

V

V

mV

µA

mA

µA

MHz

%

mV

µA

mA

V

V

µA

µA

BLOCK DIAGRAM

VIN

SD

UVLO

BIAS

+

-

-

R SET Q

Q1

100k

+

SQ

CLR

Q2

Σ

40pF

Ramp

Generator

VOUT

NFB

R1 (External) R2 (External)

1.1MHz

Oscillator

SW

Q3

+

0.1Ω

-

GND

CPL

Figure 2 – Simplified Block Diagram

Copyright © 2002

Rev. 3.0a, 2005-03-14

Microsemi

Microsemi Integrated Products

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

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