TPS61140 Datasheet, PDF (1/24 Pages) Texas Instruments – DUAL OUTPUT BOOST REGULATOR USING SINGLE INDUCTOR

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TPS61140
TPS61141
SLVS624A – JANUARY 2006 – REVISED FEBRUARY 2006
DUAL OUTPUT BOOST REGULATOR USING SINGLE INDUCTOR
FEATURES
• 3V 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 PWM for WLED Driver
• PFM for OLED Supply
• Individually Programmable Output
• Input to Output Isolation
• Short-Circuit Protection
• Built-in Soft Start
• Overvoltage Protection
• Up to 82% Efficiency
• Up to 30 kHz PWM Dimming Frequency
• Available in a 10 Pin, 3 × 3 mm QFN Package
APPLICATIONS
• Clamshell Phone With OLED/LCD Screen
DESCRIPTION
The TPS61140/1 is a dual output boost converter IC.
It is intended to be configured as a highly integrated
power solution providing regulated voltage and
current output with one boost converter. This device
is ideal for driving the OLED sub display and WLED
backlight for the LCD main display in clam shell
phones. The voltage and current can be individually
programmed through external resistors. There is a
dedicated selection pin for each output, so the two
outputs can be turned on separately or
simultaneously. When only the voltage output is
enabled, the boost converter is controlled by pulse
frequency modulation (PFM) in order to achieve high
efficiency over a wide load range. If the current output
is selected, the device adopts a 1.2 MHz pulse width
modulation control (PWM) method in order to
maximize output current. Applying an external PWM
signal to the select pin (SELI) reduces the output
current thereby allowing WLED dimming.
The TPS61140/1 has a built-in power MOSFET and
power diode; thereby, eliminating the needs for any
external active power components. In addition, the
high switching frequency reduces the external
inductor and capacitor sizes. Overall, the IC provides
a highly compact solution with high efficiency and
plenty of flexibility.
TYPICAL APPLICATION
3 V to 6 V Input
C1
4.7 mF
L1 10 mH
Vin
GND
SELI
SW
Iout
Vout
SEL V
VFB
ISET _IFB
R1
C3
1 mF
R2
C2
4.7 mF
R3
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