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LM3639A

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LM3639A Single chip 40V backlight + 1.5A flash LED driver

Product details

Number of channels 2 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 535 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 87 Topology Boost Features Adjustable Switch Frequency, CABC, Enable/Shutdown, I2C control, PWM control Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 2 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 535 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 87 Topology Boost Features Adjustable Switch Frequency, CABC, Enable/Shutdown, I2C control, PWM control Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFQ) 20 3.96 mm² 2.2 x 1.8
  • Single Chip White LED Flash and Backlight Driver
  • 1.5A Flash LED Current
  • Dual String Backlight Control (40V Max VOUT)
  • 128 Level Exponential and Linear Brightness Control
  • PWM Input for CABC
  • Programmable Over-Voltage Protection (Backlight)
  • Programmable Current Limit (Flash)
  • Programmable Switching Frequency
  • Optimized Flash Current During Low-Battery Conditions
  • Single Chip White LED Flash and Backlight Driver
  • 1.5A Flash LED Current
  • Dual String Backlight Control (40V Max VOUT)
  • 128 Level Exponential and Linear Brightness Control
  • PWM Input for CABC
  • Programmable Over-Voltage Protection (Backlight)
  • Programmable Current Limit (Flash)
  • Programmable Switching Frequency
  • Optimized Flash Current During Low-Battery Conditions

The LM3639A is a single-chip white LED Camera Flash Driver + LCD Display Backlight Driver. The low-voltage, high-current flash LED driver is a synchronous boost which provides the power for a single flash LED at up to 1.5A or dual LEDs at up to 750 mA each. The high-voltage backlight driver is a dual-output asynchronous boost which powers dual LED strings at up to 40V and 30 mA per string. An adaptive regulation method in both boost converters regulates the headroom voltage across the respective source/sink to ensure the LED current remains in regulation while maximizing efficiency. The LM3639A's flash driver is a 2MHz or 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 Flash current up to 1.5A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

The device is controlled by an I2C-compatible interface. Features for the flash LED driver include a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse, and a TX input for synchronization to RF power amplifier events or other high current conditions. Features for the LCD backlight driver include a PWM input for content adjustable backlight control, 128 exponential or linear brightness levels, programmable over-voltage protection, and selectable switching frequency (500 kHz or 1 MHz).

The device is available in a tiny 1.790 mm x 2.165 mm x 0.6 mm 20-bump, 0.4 mm pitch DSBGA package and operates over the −40°C to +85°C temperature range.

The LM3639A is a single-chip white LED Camera Flash Driver + LCD Display Backlight Driver. The low-voltage, high-current flash LED driver is a synchronous boost which provides the power for a single flash LED at up to 1.5A or dual LEDs at up to 750 mA each. The high-voltage backlight driver is a dual-output asynchronous boost which powers dual LED strings at up to 40V and 30 mA per string. An adaptive regulation method in both boost converters regulates the headroom voltage across the respective source/sink to ensure the LED current remains in regulation while maximizing efficiency. The LM3639A's flash driver is a 2MHz or 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 Flash current up to 1.5A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

The device is controlled by an I2C-compatible interface. Features for the flash LED driver include a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse, and a TX input for synchronization to RF power amplifier events or other high current conditions. Features for the LCD backlight driver include a PWM input for content adjustable backlight control, 128 exponential or linear brightness levels, programmable over-voltage protection, and selectable switching frequency (500 kHz or 1 MHz).

The device is available in a tiny 1.790 mm x 2.165 mm x 0.6 mm 20-bump, 0.4 mm pitch 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 LM3639A Single Chip 40V Backlight + 1.5A Flash LED Driver datasheet 14 Mar 2013
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
User guide LM3639A User's Guide 14 Mar 2013

Design & development

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

Evaluation board

LM3639AYFQEVM — SingleChip 40V Backlight + 1.5A Flash LED Driver Evaluation Module Board

SingleChip 40V Backlight + 1.5A Flash LED Driver Evaluation Module Board

The LM3639AYFQEVM aids in evaluation of the LM3639A Single-chip white LED Camera Flash Driver + LCD Display Backlight Driver. The low-voltage,high-current flash LED driver is a synchronous boost which provides the power for a (...)
User guide: PDF
Driver or library

LM3639ASW-LINUX — Linux Driver for LM3639A

The Linux driver supports the LM3639A Backlight and Flash LED Drivers. The Linux driver supports communication through the I2C bus and interfaces with the backlight sub-system.

 

Linux Mainline Status

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

Supported Devices:

  • lm3639a

 

Linux (...)

GUI for evaluation module (EVM)

LM3639AGUI GUI Control Software for LM3639AYFQEVM

Supported products & hardware

Supported products & hardware

Products
Backlight LED drivers
LM3639A LM3639A Single chip 40V backlight + 1.5A flash LED driver
Hardware development
Evaluation board
LM3639AYFQEVM SingleChip 40V Backlight + 1.5A Flash LED Driver Evaluation Module Board
Simulation model

LM3639A Unencrypted PSpice Transient Model Package (Rev. B)

SNVM342B.ZIP (360 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Package Pins CAD symbols, footprints & 3D models
DSBGA (YFQ) 20 Ultra Librarian

Ordering & quality

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  • MTBF/FIT estimates
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  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

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