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LM3554TMX/NOPB
Synchronous Boost Converter with 1.2A Dual High Side LED Driver and I2C Compatible Interface
HWEN
SCL
SDA
STROBE
TX1/TORCH/
GPIO1 OUT
LED2
LEDI/NTC 4.5-V or 5-V DC Power Rail
Flash
Indicator
LEDENVM/TX2
/GPIO
VBIAS
RBIAS
4.7 μF 4.7 μF
2.2 μH
2.5 V ± 5.5 V
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LM3554SNVS549C –JUNE 2009–REVISED FEBRUARY 2016
LM3554 Synchronous Boost Converter With 1.2-A Dual High-Side LED Drivers andI2C- Features Input Voltage: 2.5Vto 5.5V Programmable 4.5-Vor 5-V Constant Output
Voltage Dual High-Side Current Sources Grounded Cathode Allowing for Better Heat
Sinking and LED Routing > 90% Efficiency Ultra-Small Solution Size:<23 mm2 Four Operating Modes: Torch, Flash, LED
Indicator, and Voltage Output Accurate and Programmable LED Current from
37.5 mAto 1.2A Hardware Flash and Torch Enable LED Thermal Sensing and Current Scaleback Software Selectable Input Voltage Monitor Programmable Flash Timeout Dual Synchronization Inputs for RF Power-
Amplifier Pulse Events Open and Short LED Detection Active High Hardware Enablefor Protection
Against System Faults 400-kHzI2 C-Compatible Interface
Applications Camera Phone LED Flash Controller ClassD Audio Amplifier Power LED Current Source Biasing
DescriptionThe LM3554isa 2-MHz fixed-frequency, current-
mode synchronous boost converter. The deviceis
designedto operate asa dual 600-mA (1.2A total)
constant-current driverfor high-current white LEDs,ora regulated 4.5-Vor 5-V voltage source.
The main features include: anI2 C-compatible
interfacefor controlling the LED currentor the desired
output voltage,a hardware flash
direct triggeringof the flash pulse,
which force the flash pulse intoa low-current torch
mode allowing for synchronization to RF power
amplifier events or other high-current conditions.
Additionally, an active high hardware enable (HWEN)
input providesa hardware shutdown during system
software failures.
Five protection features are available within the
LM3554 includinga software selectable input voltage
monitor,an internal comparator for
external temperature sensor, four
limitsto ensure the battery currentis kept belowa
predetermined peak level, an overvoltage protection
featureto limit the output voltage during LED open
circuits, and an output short circuit protection which
limits the output current during shortsto GND.
Device Information(1)the endofthe data sheet.
Typical Application Circuit
