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Product details

Parameters

Input voltage (type) DC/DC Topology Boost, Current Mode Vin (Min) (V) 2.5 Vin (Max) (V) 5.5 Iout (Max) (A) 1.5 Iq (Typ) (mA) 0.75 Features Input/Output Isolation, OVP, Over Current Protection, Synchronous Rectification Operating temperature range (C) -40 to 85 Dimming method Analog, PWM open-in-new Find other Illumination LED drivers

Package | Pins | Size

DSBGA (YZR) 9 4 mm² 1.65 x 1.7 open-in-new Find other Illumination LED drivers

Features

  • 1.5-A High-Side Current Source for Single LED
  • > 85% Efficiency in Torch Mode (at 100 mA) and
    Flash Mode (at 1 A to 1.5 A)
  • Accurate Programmable Flash LED Current from
    93 mA to 1.5 A
  • Accurate Programmable Torch LED Currents:
    • 48.4 mA to 375 mA
    • 24 mA to 187 mA (LT option)
  • Small Solution Size: < 20 mm2
  • Soft-Start Operation for Battery Protection
  • Hardware Strobe Enable
  • Synchronization Input for RF Power Amplifier
    Pulse Events
  • VIN Flash Monitor Optimization
  • 400-kHz I2C-Compatible Interface
  • 0.5-mm Pitch, 9-Bump DSBGA
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Description

The LM3642 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing Flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

The LM3642 is controlled via an I2C-compatible interface. Features include a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse as well as a TX input which forces the flash pulse into a low-current Torch Mode, allowing for synchronization to RF power amplifier events or other high-current conditions.

The 4-MHz switching frequency, overvoltage protection and adjustable current limit settings allow the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device is available in a small 9-bump DSBGA package and operates over the −40°C to 85°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet LM3642 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source datasheet (Rev. H) Sep. 04, 2015
White paper Common LED Functions and LED Driver Design Considerations Sep. 21, 2020
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note LED Flash-Protection Features Aug. 23, 2017
Technical article Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical article LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical article Take better selfies with innovative LED flashes Nov. 18, 2014
Technical article Solving the automotive EMI issues in new cars with all the screens Sep. 11, 2014
User guide LM3642 Evaluation Board (Rev. A) Apr. 30, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description

1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Evaluation Module Board

The LM3642TL-LT is a 4MHz fixed-frequency synchronous boost converter plus 1.5A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing (...)
Features
  • Synchronization Input for RF Power Amplifier Pulse Events
  • 1.5A High-Side Current Source for Single LED
  • Accurate and Programmable LED Current from VIN Flash Monitor Optimization
  • 400 kHz I2C-Compatible Interface > 85% Efficiency in Torch Mode (@ 100 mA) and Flash Mode (@1A to 1.5A)
  • Accurate Programmable (...)
EVALUATION BOARD Download
document-generic User guide
49
Description

1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Evaluation Module Board

The LM3642TL is a 4MHz fixed-frequency synchronous boost converter plus 1.5A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing (...)
Features
  • Synchronization Input for RF Power Amplifier Pulse Events
  • 1.5A High-Side Current Source for Single LED
  • Accurate and Programmable LED Current from VIN Flash Monitor Optimization
  • 400 kHz I2C-Compatible Interface > 85% Efficiency in Torch Mode (@ 100 mA) and Flash Mode (@1A to 1.5A)
  • Accurate Programmable (...)

Software development

DRIVER OR LIBRARY Download
Linux Driver for LM3642
LM3642SW-LINUX The Linux driver supports the LM3642 LED Flash Driver. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lm3642

 

Linux Source Files

The files (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM510B.ZIP (47 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 9 View options

Ordering & quality

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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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