TPS61050 Datasheet, PDF (1/45 Pages) Texas Instruments – 1.2-A HIGH POWER WHITE LED DRIVER 2-MHz SYNCHRONOUS BOOST CONVERTER WITH I2C COMPATIBLE INTERFACE

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CSP-12
QFN-10
TPS61050
TPS61052
SLUS525 – MARCH 2007
1.2-A HIGH POWER WHITE LED DRIVER
2-MHz SYNCHRONOUS BOOST CONVERTER WITH I²C COMPATIBLE INTERFACE
FEATURES
• Four Operational Modes
– Torch and Flash up to I_LED = 1200 mA
– Voltage-Regulated Boost Converter:
4.5/5.0/5.25 V
– Shutdown: 0.3 µA (typ)
• Total Solution Circuit Area < 25 mm²
• Up to 96% Efficiency
• I²C-Compatible Interface up to 400 kbps
• Integrated LED Turn-On Safety Timer
• Zero Latency TX-Masking Input (TPS61050)
• Hardware Voltage Mode Selection Input
(TPS61052)
• Integrated ADC for LED V_F Monitoring
• Integrated Low Light Dimming Mode
• LED Disconnect During Shutdown
• Open/Shorted LED Protection
• Over-Temperature Protection
• Available in a 12-Pin NanoFree™ (CSP) and
10-Pin QFN Packaging
APPLICATIONS
• Camera White LED Torch/Flash for Cell
Phones, Smart-Phones and PDAs
• Audio Amplifier Power Supply
L
2.2 mH
C_IN
P
P
I2C I/F
TPS61050
SW
SW
AVIN
VOUT
LED
SCL
SDA
GPIO
FLASH_SYNC
AGND
PGND
PGND
C_OUT
10 mF
P
P
Figure 1. Typical Application
DESCRIPTION
The TPS6105x device is based on a high-frequency
synchronous-boost topology with constant current
sink to drive single white LEDs. The device uses an
inductive fixed-frequency PWM control scheme using
small external components, minimizing input ripple
current.
The 2-MHz switching frequency allows the use of
small and low profile 2.2-µH inductors. To optimize
overall efficiency, the device operates with only a
250 mV LED feedback voltage.
The TPS6105x device not only operates as a
regulated current source, but also as a standard
voltage-boost regulator. This additional operating
mode can be useful to supply other high-power
devices in the system, such as a hands-free audio
power amplifier, or any other component requiring a
supply voltage higher than the battery voltage (refer
to TPS61052).
For highest flexibility, the LED current or the desired
output voltage can be programmed via an I²C
compatible interface. To simplify flash
synchronization with the camera module, the device
offers a trigger pin (FLASH_SYNC) for fast LED
turn-on time.
When the TPS6105x is not in use, it can be put into
shutdown mode via the I²C-compatible interface,
reducing the input current to 0.3 µA (typ). During
shutdown, the LED pin is high impedance to avoid
leakage current through the LED.
+ BATTERY
C1
4.7 mm
INDUCTOR
L1
LED
SENSE
PGND
PGND
C2
LED ANODE
Figure 2. Typical PC-Board Layout
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.
NanoFree, PowerPAD are trademarks of Texas Instruments.
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 © 2007, Texas Instruments Incorporated