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LM3556 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3556 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 39 page IN OUT TEMP SW ENABLE TORCH TX SDA SCL GND 1 PH 10 PF 10 PF STROBE LED Flash LED 2.5 V to 5.5 V Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3556 SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015 LM3556 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source 1 Features 3 Description The LM3556 is a 4-MHz fixed-frequency synchronous 1 • Grounded Cathode LED Operation for Improved boost converter plus 1.5-A constant current driver for Thermal Management a high-current white LED. The high-side current • 1.5-A High-Side Current Source for Single LED source allows for grounded cathode LED operation • Accurate and Programmable LED Current from providing flash current up to 1.5 A. An adaptive regulation method ensures the current source 46.9 mA to 1.5 A remains in regulation and maximizes efficiency. • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A) The LM3556 is controlled via an I2C-compatible interface. Features include: a hardware flash enable • Small Solution Size: < 20 mm2 (STROBE) allowing a logic input to trigger the flash • LED Thermal Sensing and Current Scale-Back pulse, a hardware torch enable (TORCH) for Movie • Soft-Start Operation for Battery Protection Mode or flashlight functions, a TX input which forces the flash pulse into a low-current Torch Mode • Hardware Enable Pin allowing for synchronization to RF power amplifier • Hardware Torch Enable events or other high-current conditions, and an • Hardware Strobe Enable integrated comparator designed to monitor an NTC • Synchronization Input for RF Power Amplifier thermistor and provide an interrupt to the LED current. With a fast 1- μs transition from 0 mA to Pulse Events 46.9 mA, the TORCH input pin can be used to • VIN Flash Monitor Optimization develop custom LED current waveforms. • 400-kHz I2C-Compatible Interface The 4-MHz switching frequency, overvoltage • I2C-Compatible Programmable NTC Trip Point protection and adjustable current limit allow for the • 0.4-mm Pitch, 16-Pin DSBGA Package use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to 2 Applications +85°C temperature range. Camera Phone LED Flash Device Information(1) PART NUMBER PACKAGE BODY SIZE (MAX) LM3556 DSBGA (16) 1.69 mm × 1.64 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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