TPS75103 Datasheet, PDF (1/19 Pages) Texas Instruments – Low Dropout, Two-Bank LED Driver with PWM Brightness Control

TPS7510x
www.ti.com
SBVS080H – SEPTEMBER 2006 – REVISED JANUARY 2010
Low Dropout, Two-Bank LED Driver with PWM Brightness Control
FEATURES
1
•2 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
or 2,5mm × 2,5mm SON-10
APPLICATIONS
• Keypad and Display Backlighting
• White and Color LEDs
• Cellular Handsets
• PDAs and Smartphones
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
2,5mm × 2,5mm, 10-pin SON 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.
TPS7510x YFF
9-Ball WCSP
(Top View)
A3 B3 C3
A2 B2 C2
A1 B1 C1
TPS7510x DSK
2,5mm x 2,5mm SON-10
(Top View)
ENB 1
ENA 2
D1A 3
D2A 4
GND 5
GND
10 I_SET
9 V_IN
8 D1B
7 D2B
6 NC
V_BATT
TPS7510x
V_IN
D1A
V_ENA
ENA
D2A
V_ENB
ENB
D1B
D2B
I_SET
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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 © 2006–2010, Texas Instruments Incorporated