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LX1742

High Efficiency High Voltage Boost Controller

Microsemi Corporation 

INTEGRATED PRODUCTS

LX1742

High Efficiency High Voltage Boost Controller

PRODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where otherwise noted and

the following test conditions: VIN = 3.0V, VADJ = 0V, SHDN = VIN, VFB = 1.0V, Pin 8 = (not connected), Pin 1 = (+5V through 39.2Ω).

Parameter

`

Symbol

Test Conditions

LX1742

Units

Min Typ Max

Operating Voltage

Minimum Start-up Voltage

Start-up Voltage Temperature

Coefficient

VIN

VSU

TA = +25°C

kVST

Guaranteed: not tested

1.6

6.0

V

1.6

V

-2

mV/°C

Quiescent Current

FB Threshold Voltage

FB Input Bias Current

ADJ Input Voltage Range 1

IQ

VFB

IFB

VADJ

Not Switching

VSHDN < 0.4V

VADJ = GND

Switching mode

80 100 µA

0.5 1.0 µA

1.175 1.200 1.225 V

0

200 nA

0

VIN –

100mV

V

ADJ Input Bias Current

IADJ

VADJ = VFB = 1.20V

0

200 nA

Shutdown Input Bias Current

I SHDN SHDN = GND

-50

50 nA

Shutdown High Input Voltage

Shutdown Low Input Voltage

Current Sense Bias Current

Internal NFET On-resistance

Switch Pin Leakage Current

Switch Off-Time

Diode Forward Voltage

Diode Reverse Current

V SHDN

V SHDN

ICS

RDS(ON)

ILEAK

tOFF

VF

IR

VIN = 2V

VIN = 2V

TA = +25°C; ISW = 10mA; VFB = 1V

VSW = 25V

VFB = 1V

TA = +25°C; IF = 150mA

TA = +25°C; VR = 25V

1.6

V

0.4

V

2.0 4.0 6.0 µA

1.1

Ω

0.23

µA

300

ns

1.0

V

1.5

µA

Notes:

1. When using a DC source to adjust VOUT, the recommended VADJ (range) is 0.9V to 1.50V: see figure 9.

2. Guaranteed typical value (not tested) @ TA=25°C (see section “Inductor Selection & Current Limit Programming”).

SIMPLIFIED BLOCK DIAGRAM

FB

ADJ

A

O ff-time

Controller

Reference

Logic

B

1.2V

Reference

Current

Limiter

Driver

SW

OUT

GND

4µA

CS

Shutdown

IN

Logic

SHDN

Copyright © 2000

Rev. 1.0b, 2005-03-03

Microsemi

Integrated Products Division

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

Page 3

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