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LM3555TLX/NOPB
Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interface
LM3555
2.2 μH
COUT
10 μF
CIN
10 μF
VIN
VLED
I2C/EN
SCL/EN1
SDA/EN2
VBAT
VOUT
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LM3555SNVS594G –DECEMBER 2008–REVISED APRIL 2016
LM3555 Synchronous Boost Converter With 500-mA High-Side
LED Driver and Dual-Mode Control Interface Features High-Voltage High-Side Current Source Allows for
Grounded Cathode LED Operation Synchronous Boost Converter Peak Converter Efficiency> 90% Accurate and Programmable LED Current
Ranging From60 mAto 500 mA Adaptive LED Current Range Basedon LED
Configuration Dedicated Indicator Current Source Dedicated Torch and Strobe Pins Dual Mode Control (General PurposeorI2C) Broken Inductor Detection Output Overvoltage Protection Output and LED Short-Circuit Protection 400-kHzI2 C-Compatible Interface
ApplicationsCamera Phone LED Flash
DescriptionThe LM3555isa 2-MHz fixed-frequency, current-
mode synchronous boost converter designedto drive
eithera single flash LEDat 500 mAor two series
flash LEDsat 400 mA.A high-voltage current source
allows the LEDsto be terminatedto the GND plane
eliminating the need for an additional return trace
backto the device. dual-mode control interface allows the user to
configure the LM3555 with a general-purpose
interface using two enable pins for controlor anI2C
allowinga higher levelof control. Both interfaces
allow accessto the indicator, assist light, and flash
modes.A dedicated STROBE pin providesa direct
interfaceto trigger the flash event, while an external
TORCH pin provides an additional method for
enabling the LEDsina constant current mode.
The LM3555 can adaptively scale the maximum flash
level deliveredto the LEDs based upon the flash
configuration, whetheritbea single LEDor two LEDs series.
Eight protection features are availableon the LM3555
ranging from overvoltage protection to broken
inductor detection. The LM3555 has four selectable
inductor current limits to help the user select an
inductor thatis appropriatefor the design.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application
