TPS75100 Datasheet, PDF (1/27 Pages) Texas Instruments – Low Dropout, Two-Bank LED Driver With PWM Brightness Control

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TPS75100, TPS75103, TPS75105
SBVS080J – SEPTEMBER 2006 – REVISED NOVEMBER 2016
TPS7510x Low Dropout, Two-Bank LED Driver With PWM Brightness Control
1 Features
•1 Regulated Output Current with 2% LED-to-LED
Matching
• Drives Up to Four LEDs at 25 mA Each in a
Common Cathode Topology
• 28-mV 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 3 mA to 10 mA (in 1-mA
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 2.50-mm × 2.50-mm WSON-10
2 Applications
• Keypad and Display Backlighting
• White and Color LEDs
• Cellular Handsets
• PDAs and Smartphones
3 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 a 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 (ENx, where x indicates LED bank A
or B). 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 25 mA per LED.
No internal switching signals are used, eliminating
troublesome electromagnetic interference (EMI). The
TPS7510x is offered in an ultra-small, 9-ball, 0.4-mm
ball-pitch wafer chip-scale package (WCSP) and a
2.50-mm × 2.50-mm, 10-pin WSON 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS7510x
WSON (10)
DSBGA (9)
2.50 mm × 2.50 mm
1.208 mm x 1.208 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Diagram
V_BATT
V_ENA
V_ENB
TPS7510x
V_IN
D1A
ENA
D2A
ENB
D1B
D2B
I_SET
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.