LX1990 datasheet(3/11 Pages) MICROSEMI

3 / 11 page

Microsemi

Integrated Products

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

Page 3

Rev. 1.0d, 2005-03-14

LX1990

Dual Programmable LED Current Sink

RECOMM END E D O P ERATI NG CONDI T I ONS

LX1990

Parameter

Min

Typ

Max

Units

Supply Voltage (VDD)

2.7

5.5

ENA (ENABLE) Input Voltage

VDD

ISET Voltage

1.25

ISET Current

300

µA

IOUTA / IOUTB Compliance Voltage Range

0.1

IOUTA / IOUTB Output Current Range

0.1

ELECTRI CAL CHA RACTERI S TI CS

Unless otherwise specified, the following specifications apply over the operating ambient temperature -40

°C

≤ T

≤ 85°C and the

following test conditions: VDD = 2.7 to 5.5 VDC, ISET = 200µA, VOUT

≤ 5.5V, VLOAD ≤ 10V. Typical values are at T

A= 25°C

LX1990

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Power Characteristics

Quiescent Current

I_QUI

VDD = 2.7V; ISET = 0uA

1.4

Quiescent Current

I_QUI

VDD = 5.5V; ISET = 300uA

3.0

Sleep Current

I_SLEEP

VDD = 5.5V, ENA

≤ 0.4V

0.08

µA

Enable Input

Enable Logic Threshold

VTH_EN

0.8

1.55

2.4

Enable Input Current

IIN_EN

ENA = VDD = 5.5V

µA

ISET to Out Pulse Response

TD(ON)

1.2

µS

ISET to Out Pulse Response

TD(OFF)

1.4

µS

ISET Input

ISET Current Range

IISET

RSET terminated to GND

300

µA

ISET Voltage

VISET

ISET = 200uA

1.225

1.25

1.275

VDC

Output Characteristics

Output Current Amplitude

IOUT

0.5 < VOUT < 5.5V, ISET = 200µA

18.5

21.5

mADC

OUTA to OUTB Current Matching

IOUT_MATCH

IOUT = 20mA ; (IOUTA – IOUTB ) / IOUTA * 100

0.4

ISET to IOUT Current Ratio

IOUT_RATIO

IOUT/ISET; ISET = 200µA ; VDD = 5.5V

102

ISET to IOUT Current Ratio

IOUT_RATIO

IOUT/ISET; ISET = 200µA ; VDD = 2.7V

Output Current ISET = 0µA

IOUT_ZERO

0.5 < VOUT < VLOAD, ISET = 0µA

100

µADC

Dropout Voltage

VDROPOUT

IOUT = 20mA

150

300

Dropout Voltage

VDROPOUT

IOUT = 30mA

200

400

Maximum Output Current, ISET

Shorted To Gnd. Each Output

ISC

VISET = Zero Volts; VDD=5V

100

mADC

Output Off State Current

IOUTOFF

ENA

≤ 0.4V

µADC

1 At enable voltages greater than 0.4V but less than 0.8V the outputs will remain off but the sleep current may be greater than 1µA.

2 Dropout is defined as the OUTA/B to GND voltage at which the output current sink drops 10% from the nominal value.

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