1FEATURES
• 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.