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LM3642TLX-LT Datasheet(PDF) 1 Page - Texas Instruments |
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LM3642TLX-LT Datasheet(HTML) 1 Page - Texas Instruments |
1 / 30 page IN OUT SW TX/TORCH SDA SCL 1 2H 10 2F 10 2F STROBE LED Flash LED 2.5V to 5.5V GND Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3642 SNVS891H – SEPTEMBER 2012 – REVISED SEPTEMBER 2015 LM3642 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source 1 Features 3 Description The LM3642 is a 4-MHz fixed-frequency synchronous 1 • 1.5-A High-Side Current Source for Single LED boost converter plus 1.5-A constant current driver for • > 85% Efficiency in Torch Mode (at 100 mA) and a high-current white LED. The high-side current Flash Mode (at 1 A to 1.5 A) source allows for grounded cathode LED operation • Accurate Programmable Flash LED Current from providing Flash current up to 1.5 A. An adaptive regulation method ensures the current source 93 mA to 1.5 A remains in regulation and maximizes efficiency. • Accurate Programmable Torch LED Currents: The LM3642 is controlled via an I2C-compatible – 48.4 mA to 375 mA interface. Features include a hardware flash enable – 24 mA to 187 mA (LT option) (STROBE) allowing a logic input to trigger the flash • Small Solution Size: < 20 mm2 pulse as well as a TX input which forces the flash • Soft-Start Operation for Battery Protection pulse into a low-current Torch Mode, allowing for synchronization to RF power amplifier events or other • Hardware Strobe Enable high-current conditions. • Synchronization Input for RF Power Amplifier The 4-MHz switching frequency, overvoltage Pulse Events protection and adjustable current limit settings allow • VIN Flash Monitor Optimization the use of tiny, low-profile inductors and (10-µF) • 400-kHz I2C-Compatible Interface ceramic capacitors. The device is available in a small • 0.5-mm Pitch, 9-Bump DSBGA 9-bump DSBGA package and operates over the −40°C to 85°C temperature range. 2 Applications Device Information(1) Camera Phone LED Flash PART NUMBER PACKAGE BODY SIZE (MAX) LM3642 DSBGA (9) 1.69 mm × 1.64 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic 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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