LM3631 Integrated WLED Backlight Driver and Bias Power for LCD panels | TI.com

LM3631 (ACTIVE)

Integrated WLED Backlight Driver and Bias Power for LCD panels

Integrated WLED Backlight Driver and Bias Power for LCD panels - LM3631
Datasheet
 

Description

The LM3631 is a complete LCD backlight and bias power solution for mobile devices. This one-chip solution has an integrated high-efficiency backlight LED driver and positive/negative bias supplies for LCD drivers addressing the power requirements of high-definition LCDs. Integrated solution allows small solution size while still maintaining high performance.

Capable of driving up to 16 LEDs, the LM3631 is ideal for small- to medium-size displays. Two additional programmable LDO regulator outputs can be used to power display controller, LCD gamma reference, or any additional peripherals.

A high level of integration and programmability allows the LM3631 to address a variety of applications without the need for hardware changes. Voltage levels, backlight configuration, and power sequences are all configurable through I2C interface.

Features

  • Drives up to Two Strings with Maximum of Eight LEDs in Series
    • Integrated Backlight Boost with 29-V Maximum Output Voltage
    • Two Low-Side Constant-Current LED Drivers with 25-mA
      Maximum Output Current
  • Backlight Efficiency Up to 90%
  • 11-Bit Linear or Exponential Dimming with up to 17-Bit Output
    Resolution
  • External PWM Input for CABC Backlight Operation
  • LCD Bias Efficiency > 85%
  • Programmable Positive LCD bias, 4-V to 6-V, 100-mA Maximum
    Output Current
  • Programmable Negative LCD bias, –4-V to –6-V,
    80-mA Maximum Output Current
  • Two Positive Programmable LDO Reference Outputs
    • 4-V to 6-V, 50-mA Maximum Output Current
    • 1.8-V to 3.3-V, 80-mA Maximum Output Current
  • 2.7-V to 5-V Input Voltage Range

Parametrics

Compare all products in Backlight LED drivers Email Download to Excel
Part number Order Channels (#) Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switching frequency (Max) (kHz) Type LED current per channel (mA) LED (#) Topology Shutdown current (Typ) (uA) Peak efficiency (%) LED configuration Function Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3631 Order now 2     2.7     5.0     0     30     1100     Inductive     25     16     Boost
Current Sink
LDO
Multi-Channel    
1     90     Dual
Parallel
Series    
Backlight + Bias     Adjustable Switch Frequency
CABC
Enable/Shutdown
I2C Control
OVP
PWM Control
Power Good
Soft Start    
-40 to 85     DSBGA | 24     See datasheet (DSBGA)    
LM3630A Order now 2     2.3     5.5     12     40     1120     Inductive     28.5     20     Boost     1     87     Dual       I2C Control
OVP
PWM Control
Soft Start
Thermal Shutdown    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)    
LM3632A Order now 2     2.7     5.5     0     29.5     1100     Inductive     25     16     Boost
Current Sink
Multi-Channel    
1     92     Dual
Parallel
Series
Single    
Backlight, Bias Power, Flash     Adjustable Switch Frequency
CABC
Direct PWM Dimming
Enable/Shutdown
I2C Control
Integrated Switch
OVP
PWM Control
Soft Start    
-40 to 85     DSBGA | 30     See datasheet (DSBGA)    
LM36922 Order now 2     2.5     5.5     0     29.5     1050     Inductive     25     24     Boost     1.2     92     Parallel
Series    
  Adjustable Switch Frequency
CABC
Direct PWM Dimming
Enable/Shutdown
I2C Control
OVP
PWM Control
Thermal Shutdown    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)    
LM36923 Order now 3     2.5     5.5     0     29.5     1050     Inductive     25     24     Boost     1.2