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.