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TPS61052

更新时间： 2024-11-24 04:48:51
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德州仪器 - TI 驱动器转换器升压转换器高功率电源
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45页 1390K
描述
1.2-A HIGH POWER WHITE LED DRIVER 2-MHz SYNCHRONOUS BOOST CONVERTER WITH I2C COMPATIBLE INTERFACE

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TPS61052 数据手册

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TPS61050  
CSP-12  
QFN-10  
TPS61052  
www.ti.com  
SLUS525–MARCH 2007  
1.2-A HIGH POWER WHITE LED DRIVER  
2-MHz SYNCHRONOUS BOOST CONVERTER WITH I2C COMPATIBLE INTERFACE  
FEATURES  
DESCRIPTION  
•
Four Operational Modes  
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.  
–
–
Torch and Flash up to ILED = 1200 mA  
Voltage-Regulated Boost Converter:  
4.5/5.0/5.25 V  
–
Shutdown: 0.3 µA (typ)  
•
•
•
•
•
•
Total Solution Circuit Area < 25 mm2  
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.  
Up to 96% Efficiency  
I2C-Compatible Interface up to 400 kbps  
Integrated LED Turn-On Safety Timer  
Zero Latency TX-Masking Input (TPS61050)  
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).  
Hardware Voltage Mode Selection Input  
(TPS61052)  
•
•
•
•
•
•
Integrated ADC for LED VF Monitoring  
Integrated Low Light Dimming Mode  
LED Disconnect During Shutdown  
Open/Shorted LED Protection  
For highest flexibility, the LED current or the desired  
output voltage can be programmed via an I2C  
Over-Temperature Protection  
Available in a 12-Pin NanoFree™ (CSP) and  
10-Pin QFN Packaging  
compatible  
interface.  
To  
simplify  
flash  
synchronization with the camera module, the device  
offers a trigger pin (FLASH_SYNC) for fast LED  
turn-on time.  
APPLICATIONS  
•
Camera White LED Torch/Flash for Cell  
Phones, Smart-Phones and PDAs  
Audio Amplifier Power Supply  
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.  
•
4.7 mm  
TPS61050  
L
+ BATTERY  
SW  
SW  
VOUT  
INDUCTOR  
2.2 mH  
C1  
COUT  
AVIN  
10 mF  
L1  
P
CIN  
LED  
SENSE  
P
P
PGND  
LED  
SCL  
SDA  
2
I C I/F  
GPIO  
PGND  
FLASH_SYNC  
P
PGND  
PGND  
C2  
AGND  
LED ANODE  
Figure 1. Typical Application  
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  
1234567...45

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