TLED2043 Datasheet, PDF (2/15 Pages) Texas Instruments – 4-CHANNEL WHITE LED DRIVER

TLED2043
4-CHANNEL WHITE LED DRIVER
SLDS147C – JUNE 2002 – REVISED NOVEMBER 2002
description/ordering information
The TLED2043 is a four-channel, white LED driver used for backlighting color LCD displays in portable
equipment. The device consists of four FET outputs, each of which is used essentially as a current sink to bias
a single LED. The gates of the FETs are controlled collectively by a current-control amplifier that automatically
monitors the battery voltage. If the battery voltage drops when compared to an externally set reference voltage,
the current-control amplifier proportionately lowers all four FETs’ output drives to conserve battery power.
Additionally, the TLED2043 has internal switches that are programmed to disconnect the power supply and
supporting circuitry to the device when LED operation is not needed, offering significant power savings during
periods of inactivity.
Offering smaller board space, lower R_DS-ON, and lower overall cost, the TLED2043 has clear advantages over
the use of discrete devices in implementing a white-LED driver solution. Compared to the use of charge pumps
and dc-dc converters in similar applications, the TLED2043 again can offer the advantages of smaller board
space and lower solution cost because no costly inductors and/or capacitors are required. In addition, it avoids
the switching-noise and power-loss issues associated with such devices.
Characterized for operation from –40°C to 85°C, the TLED2043 is offered in 20-pin TSSOP (PW) and MicroStar
Jr. BGA (GQN) packages for maximum space savings.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
–40°C to 85°C
TSSOP (PW)
Tube of 70
Reel of 2000
TLED2043IPW
TLED2043IPWR
2043I
VFBGA (GQN)
Reel of 1000
TLED2043IGQNR
2043I
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are}
available at www.ti.com/sc/package.
FUNCTION TABLE
SW
INPUT
SWITCH 1, 2, 3
STATUS
H
All OFF
L
All ON
Open
All OFF
2
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