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LM3642TLX/NOPB
1.5A Synchronous Boost LED Flash Driver w/ High-Side Current 9-DSBGA
OUTSWTX/TORCH
SDA
SCL
1 PH
10 PF 10 PF
STROBE LED
Flash
LED
2.5V to 5.5V
GND
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LM3642SNVS891H –SEPTEMBER 2012–REVISED SEPTEMBER 2015
LM3642 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source Features 3 DescriptionThe LM3642isa 4-MHz fixed-frequency synchronous 1.5-A High-Side Current Source for Single LED boost converter plus 1.5-A constant current driver for• > 85% Efficiencyin Torch Mode (at 100 mA) and a high-current white LED. The high-side currentFlash Mode (at1Ato 1.5A) source allows for grounded cathode LED operation Accurate Programmable Flash LED Current from providing Flash current upto 1.5 A. An adaptive
regulation method ensures the current source93 mAto 1.5A
remainsin regulation and maximizes efficiency.• Accurate Programmable Torch LED Currents:
The LM3642is controlled via anI2 C-compatible– 48.4 mAto 375 mA
interface. Features includea hardware flash enable– 24 mAto 187 mA (LT option) (STROBE) allowinga logic inputto trigger the flash• Small Solution Size:<20 mm2 pulse as well asa TX input which forces the flash Soft-Start Operationfor Battery Protection pulse intoa low-current Torch Mode, allowing for
synchronizationto RF power amplifier eventsor other• Hardware Strobe Enable high-current conditions.• Synchronization Input for RF Power Amplifier
The 4-MHz switching frequency, overvoltagePulse Events
protection and adjustable current limit settings allow• VIN Flash Monitor Optimization the use of tiny, low-profile inductors and (10-µF)• 400-kHzI2 C-Compatible Interface ceramic capacitors. The deviceis availableina small 0.5-mm Pitch, 9-Bump DSBGA 9-bump DSBGA package and operates over the
−40°Cto 85°C temperature range.
Applications Device Information(1)Camera Phone LED Flash
(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Simplified Schematic
