TPS61325 Datasheet, PDF (1/62 Pages) Texas Instruments – 1.5A/4.1A Multiple LED Camera Flash Driver With I2CTM Compatible Interface

TPS61325
www.ti.com
SLVS977 – FEBRUARY 2010
1.5A/4.1A Multiple LED Camera Flash Driver With I²C^TM Compatible Interface
FEATURES
1
•23 Four Operational Modes
– DC Light and Flashlight
– Voltage Regulated Converter: 3.8V...5.7V
– Standby: 2mA (typ.)
• Storage Capacitor Friendly Solution
• Automatic V_F and ESR Calibration
• Power-Save Mode for Improved Efficiency at
Low Output Power, Up to 95% Efficiency
• Output Voltage Remains Regulated When
Input Voltage Exceeds Nominal Output Voltage
• I²C Compatible Interface up to 3.4Mbits/s
• Dual Wire Camera Module Interface
• Zero Latency Tx-Masking Input
• LED Temperature Monitoring
• Privacy Indicator LED Output
• Integrated LED Safety Timer
• GPIO/Flash Ready Output
• Total Solution Size of Less Than 25 mm²
(<1mm height)
• Available in a 20-Pin NanoFree™ (CSP)
APPLICATIONS
• Single/Dual/Triple White LED Flashlight Supply
for Cell Phones and Smart-Phones
• LED Based Xenon "Killer" Flashlight
DESCRIPTION
The TPS6132x device is based on a high-frequency
synchronous boost topology with constant current
sinks to drive up to three white LEDs in parallel
(445mA/890mA/445mA maximum flash current). The
extended high-current mode (HC_SEL) allows up
to 1025mA/2050mA/1025mA flash current out of
the storage capacitor.
The high-capacity storage capacitor on the output of
the boost regulator provides the high-peak flash LED
current, thereby reducing the peak current demand
from the battery to a minimum.
The 2-MHz switching frequency allows the use of
small and low profile 2.2mH inductors. To optimize
overall efficiency, the device operates with a 400mV
LED feedback voltage.
The TPS6132x device not only operates as a
regulated current source, but also as a standard
voltage boost regulator. The device keeps the output
voltage regulated even when the input voltage
exceeds the nominal output voltage. The device
enters power-save mode operation at light load
currents to maintain high efficiency over the entire
load current range.
To simplify DC light and flashlight synchronization
with the camera module, the device offers a
dedicated control interface (STRB0, STRB1) for zero
latency LED turn-on time.
2.5 V..5.5 V
CI
4.7 mF
L
2.2 mH
TPS61325
SW
SW
AVIN
HC_SEL
VOUT
BAL
CO
10mF ^D1
D2
PHONE POWER ON
I²C I/F
NTC
STRB0
STRB1
SCL
SDA
Tx-MASK
TS
AGND
LED1
LED2
LED3
INDLED
1.8 V
GPIO/PG
PGND
PGND
Privacy
Indicator
FLASH READY
Figure 1. Typical Application
1
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 is a trademark of Texas Instruments.
2
I²C is a trademark of NXP Semiconductors.
3
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 © 2010, Texas Instruments Incorporated