TPS61150 Datasheet, PDF (1/21 Pages) Texas Instruments – DUAL OUTPUT BOOST WLED DRIVER USING SINGLE INDUCTOR

TPS61150, TPS61151
www.ti.com
SLVS625A – FEBRUARY 2006 – REVISED MARCH 2007
DUAL OUTPUT BOOST WLED DRIVER
USING SINGLE INDUCTOR
FEATURES
• 2.5-V to 6-V Input Voltage Range
• Two Outputs Each up to 27 V
• 0.7-A Integrated Switch
• Built-In Power Diode
• 1.2-MHz Fixed PWM Frequency
• Individually Programmable Output Current
• Input-to-Output Isolation
• Built-In Soft Start
• Overvoltage Protection
• Up to 83% Efficiency
• Up to 30 kHz PWM Dimming Frequency
• Available in a 10 Pin, 3 × 3 mm QFN Package
APPLICATIONS
• Sub and Main Display Backlight in Clam Shell
Phones
• Display and Keypad Backlight
• Up to 14 WLED Driver
DESCRIPTION
The TPS61150/1 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,
resulting in PWM dimming of the WLEDs. The boost
regulator runs at 1.2 MHz 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
3 mm x 3 mm 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
2.5 V to 6 V
Input
L1 10 mH
C1
1 mF
SW
Vin
Iout
Gnd
SEL1
SEL2 ^IFB1
IFB2
ISET1 ISET2
C2
1 mF
R1
R2
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 © 2006–2007, Texas Instruments Incorporated