TPS61150A Datasheet, PDF (1/24 Pages) Texas Instruments – DUAL OUTPUT BOOST WLED DRIVER USING SINGLE INDUCTOR

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DUAL OUTPUT BOOST WLED DRIVER
USING SINGLE INDUCTOR
TPS61150A
SLVS706 – OCTOBER 2006
FEATURES
• 2.5V to 6V Input Voltage Range
• 0.7A Integrated Switch
• Built-in Power Diode
• 1.2MHz Fixed PWM Frequency
• Individually Programmable Output Current
• Input-to-Output Isolation
• Built-in Soft Start
• 27V Overvoltage Protection
• 3% at 15mA Matching between Two Current
Strings, Improvement from TPS61150/1
• Up to 83% Efficiency
• Up to 30kHz PWM Dimming Frequency
• Availiable in a 10 Pin, 3 × 3 mm QFN Package
APPLICATIONS
• Up to 14 WLED Driver for Media Form Factor
Display
• Sub and Main Display Backlight in Clam Shell
Phones
• Display and Keypad Backlight in Portable
Equipment
DESCRIPTION
The TPS61150A is a high frequency boost converter
with two regulated current outputs for driving
WLEDs. Each current output can be individually
programmed through external resistors. There is
dedicated selection pin for each output, so the two
outputs can be turned on separately or
simultaneously. The output current can be reduced
by a pulse width modulation (PWM) signal on the
select pins or an analog voltage on the ISET pin. The
boost regulator runs at 1.2MHz fixed switching
frequency to reduce output ripple and avoid audible
noises associated with PFM control.
The two current outputs are ideal for driving WLED
backlight for the sub and main displays in clam shell
phones. The two outputs can also be used for driving
display and keypad backlights. When used together,
the two outputs can drive up to 14 WLED for one
large display.
In addition to the small inductor, small capacitor and
3mm x 3mm QFN package, the built-in MOSFET and
diode eliminate the need for any external power
devices. Overall, the IC provides an extremely
compact solution with high efficiency and plenty of
flexibility.
TYPICAL APPLICATION
2.5V to 6V Input
C1
1mF
L1
10mH
VIN
SW
IOUT
C2
GND
1mF
TPS61150A
SEL1
SEL2
IFB1
IFB2
ISET1 ISET2
R1
56.5kW
R2
56.5kW
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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, Texas Instruments Incorporated