TPS7510X Datasheet, PDF (1/15 Pages) Texas Instruments – Low Dropout, Two-Bank LED Driver with PWM Brightness Control

TPS7510x
www.ti.com
SBVS080C – SEPTEMBER 2006 – REVISED MARCH 2007
Low Dropout, Two-Bank LED Driver with PWM Brightness Control
FEATURES
• Regulated Output Current with 2%
LED-to-LED Matching
• Drives up to Four LEDs at 25mA Each in a
Common Cathode Topology
• 28mV Typical Dropout Voltage Extends
Usable Supply Range in Li-Ion Battery
Applications
• Brightness Control Using PWM Signals
• Two 2-LED Banks with Independent Enable
and PWM Brightness Control per Bank
• No Internal Switching Signals—Eliminates EMI
• Default LED Current Eliminates External
Components
– Default values from 3mA to 10mA (in 1mA
increments) available using innovative
factory EEPROM programming
– Optional external resistor can be used for
high-accuracy, user-programmable current
• Over-Current and Over-Temperature
Protection
• Available in Wafer Chip-Scale Package
APPLICATIONS
• Keypad and Display Backlighting
• White and Color LEDs
• Cellular Handsets
• PDAs and Smartphones
TPS7510x YFF
9-Ball WCSP
(Top View)
A3 B3 C3
A2 B2 C2
A1 B1 C1
DESCRIPTION
The TPS7510x linear low dropout (LDO) matching
LED current source is optimized for low power
keypad and navigation pad LED backlighting
applications. The device provides a constant current
to up to four unmatched LEDs organized in two
banks of two LEDs each in a common-cathode
topology. Without an external resistor, the current
source defaults to factory-programmable, preset
current level with ±0.5% accuracy (typical). An
optional external resistor can be used to set initial
brightness to user-programmable values with higher
accuracy. Brightness can be varied from off to full
brightness by inputting a pulse width modulation
(PWM) signal on each Enable pin. Each bank has
independent enable and brightness control, but
current matching is done to all four channels
concurrently. The input supply range is ideally suited
for single-cell Li-Ion battery supplies and the
TPS7510x can provide up to 25mA per LED.
No internal switching signals are used, eliminating
troublesome electromagnetic interference (EMI). The
TPS7510x is offered in an ultra-small, 9-ball, 0.4mm
ball-pitch wafer chip-scale package (WCSP) and a
3mm × 3mm QFN package, yielding a very compact
total solution size ideal for mobile handsets and
portable backlighting applications. The device is fully
specified over T_J = –40°C to +85°C.
V_BATT
V_ENA
V_ENB
TPS7510x
V_IN
D1A
ENA
D2A
ENB
D1B
D2B
I_SET
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated