LM3565 Datasheet, PDF (1/35 Pages) Texas Instruments – 4MHz, High-Current Flash LED Driver

LM3565
www.ti.com
SNVS957 – JANUARY 2013
4MHz, High-Current Flash LED Driver
Check for Samples: LM3565
FEATURES
1
• High Efficiency Synchronous Boost Converter
• Drives 2 LEDs in Series with up to 930 mA
• External Strobe Pin for Hardware Enabled
Flash
• External Torch Pin for Hardware Enabled
Torch
• Dedicated Transmit Interrupt Pin
• 8-Bit ADC for LED Voltage and Input Voltage
Monitoring
• Automatic Diode Current Scale Back
• PWM Control in Flash and Assist Modes
• Fault Detection and Reporting
• 400 kHz I²C-Compatible Interface
• 16-Bump, 1.990 mm x 1.990 mm x 0.6 mm
DSBGA Package (YZR0016AAA)
APPLICATIONS
• Camera Phone LED Flash
DESCRIPTION
The LM3565 is a 4 MHz fixed-frequency, current
mode synchronous boost converter designed to drive
two series flash LEDs at 930 mA. A high-voltage
current source allows the LEDs to be terminated to
the GND plane eliminating the need for an additional
return trace back to the IC.
A dedicated Strobe pin provides a direct interface to
trigger the flash event, while an external Torch pin
provides an additional method for enabling the LEDs
in a constant current mode. The LM3565 can
adaptively scale the maximum flash level delivered to
the LEDs based upon the measured input voltage.
Multiple protection features are available on the
LM3565 ranging from over-voltage protection to
output short-circuit detection.
The LM3565 has four selectable inductor current
limits to help the user select an inductor that is
appropriate for the design.
TYPICAL APPLICATION CIRCUIT
1 µH
V_BAT
C_IN1
10 µF
C_IN2
100 nF
V_IN
SW
x2 _VOUT
x2
LM3565
STROBE
TORCH
ENABLE
VLED
x2
SCL
SDA
Tx-MASK
PGND
x2 ^AGND
C_OUT1
10 µF
C_OUT2
10 µF
WLED
WLED
1
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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 © 2013, Texas Instruments Incorporated