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LM3697

ACTIVE

3 String backlight driver with 11-bits of Exponential dimming

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Data sheet

LM3697

ACTIVE
Data sheet Order now

Product details

Number of channels 3 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1100 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 91 Topology Boost Features I2C control, OVP, PWM control Operating temperature range (°C) -40 to 125 Rating Catalog
Number of channels 3 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1100 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 91 Topology Boost Features I2C control, OVP, PWM control Operating temperature range (°C) -40 to 125 Rating Catalog
DSBGA (YFQ) 12 2.52000000000000018 mm² 1.8 x 1.4000000000000001
  • Drives three parallel high-voltage led strings for display and keypad lighting
  • High-voltage strings capable of up to 40-V output voltage and up to 90% efficiency
  • Up to 30 mA per current sink
  • 11-Bit configurable dimming resolution
  • PWM input for content adjustable brightness control (CABC)
  • Fully configurable LED grouping and control
  • Integrated 1-A/40-V MOSFET
  • Adaptive boost output to LED voltages
  • Selectable 500-kHz and 1-MHz switching frequency
  • Four configurable overvoltage protection thresholds (16 V, 24 V, 32 V, and 40 V)
  • Overcurrent protection
  • Thermal shutdown protection
  • 29-mm2 Total solution size
  • Drives three parallel high-voltage led strings for display and keypad lighting
  • High-voltage strings capable of up to 40-V output voltage and up to 90% efficiency
  • Up to 30 mA per current sink
  • 11-Bit configurable dimming resolution
  • PWM input for content adjustable brightness control (CABC)
  • Fully configurable LED grouping and control
  • Integrated 1-A/40-V MOSFET
  • Adaptive boost output to LED voltages
  • Selectable 500-kHz and 1-MHz switching frequency
  • Four configurable overvoltage protection thresholds (16 V, 24 V, 32 V, and 40 V)
  • Overcurrent protection
  • Thermal shutdown protection
  • 29-mm2 Total solution size

The LM3697 11-bit LED driver provides high-performance backlight dimming for 1, 2, or 3 series LED strings while delivering up to 90% efficiency. The boost converter with integrated 1-A, 40-V MOSFET automatically adjusts to LED forward voltage to minimize headroom voltage and effectively improve LED efficiency.

The LM3697 is a high-efficiency three-string power source for backlight or keypad LEDs in smart-phone handsets. The high-voltage inductive boost converter provides the power for three-series LED strings for display backlight and keypad functions (HVLED1, HVLED2, and HVLED3).

An additional feature is a pulse width modulation (PWM) control input for content adjustable backlight control, which can be used to control any high-voltage current sink.

The LM3697 is fully configurable via an I2C-compatible interface. The device operates over a
2.7-V to 5.5-V input voltage range and a −40°C to +85°C temperature range.

The LM3697 11-bit LED driver provides high-performance backlight dimming for 1, 2, or 3 series LED strings while delivering up to 90% efficiency. The boost converter with integrated 1-A, 40-V MOSFET automatically adjusts to LED forward voltage to minimize headroom voltage and effectively improve LED efficiency.

The LM3697 is a high-efficiency three-string power source for backlight or keypad LEDs in smart-phone handsets. The high-voltage inductive boost converter provides the power for three-series LED strings for display backlight and keypad functions (HVLED1, HVLED2, and HVLED3).

An additional feature is a pulse width modulation (PWM) control input for content adjustable backlight control, which can be used to control any high-voltage current sink.

The LM3697 is fully configurable via an I2C-compatible interface. The device operates over a
2.7-V to 5.5-V input voltage range and a −40°C to +85°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet LM3697 High-efficiency three-string white LED driver datasheet (Rev. D) PDF | HTML 27 Mar 2019
Application note How to use the LM3697 Device to Design a Backlight Unit in a Smartphone PDF | HTML 15 Apr 2021
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note Analog PWM Dimming in White-LED Drivers 21 Dec 2016
EVM User's guide LM3697EVM User Guide 15 Nov 2013

Design & development

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

Evaluation board

LM3697EVM — Evaluation Module for LM3697 Three String White LED Driver for Smartphone Handsets

The LM3697 Evaluation Module (LM3697EVM) is designed to fully evaluate the LM3697 Three String backlight driver.  The LM3697EVM consists of the LM3697, 3p10s white LED strings, level shifters and the USB2ANY interface.  The Texas Instruments USB2ANY interface provides the hardware link (...)

User guide: PDF
Not available on TI.com
Driver or library

LM3532SW-LINUX — Linux Driver for LM3532

The Linux driver supports the LMU(Lighting Management Unit) devices for smartphone handsets. The Linux driver supports communication through the I2C bus and interfaces with various sub-systems.

 

Linux Mainline Status

Available in Linux Main line: No
Available through git.ti.com: (...)

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GUI for evaluation module (EVM)

SNVC095 — LM3697 GUI Software

Supported products & hardware

Supported products & hardware

Products
Backlight LED drivers
LM3697 — 3 String backlight driver with 11-bits of Exponential dimming
Hardware development
Evaluation board
LM3697EVM — Evaluation Module for LM3697 Three String White LED Driver for Smartphone Handsets
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Simulation model

LM3697 Unencrypted PSpice Transient Model Package (Rev. B)

SNOM463B.ZIP (51 KB) - PSpice Model
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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 (...)
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DSBGA (YFQ) 12 Ultra Librarian
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