LM3632A Single-Chip Backlight with Bias Power and 1.5-A Flash LED Driver | TI.com

LM3632A (ACTIVE)

Single-Chip Backlight with Bias Power and 1.5-A Flash LED Driver

 

Description

The LM3632A integrates the WLED drivers for both the backlight of the LCD panel and the camera flash along with the bias power for the LCD panel into one device. The device has all the safety features required in LED drivers with up to 90% efficiency and bias positive/negative power rails achieving 1.5% accuracy. Capable of driving up to 16 backlight LEDs, the device is ideal for small- to medium-size displays. A 1.5-A constant-current LED driver powered by a synchronous boost converter can be used for flash applications. The high-side flash current source allows for grounded cathode LED operation.

A high level of integration and programmability allows the LM3632A to address a variety of applications without the need for hardware changes.

Features

  • Drives up to Two Strings of Typically 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 Exponential or Linear Dimming
  • External PWM Input for CABC Backlight
    Operation
  • LCD Bias Efficiency > 85%
  • Programmable Positive LCD bias, 4-V to 6-V, 50-
    mA Maximum Output Current
  • Programmable Negative LCD bias, –4-V to –6-V,
    50-mA Maximum Output Current
  • 1.5-A Flash LED Boost
  • Flash Efficiency > 85%
  • 2.7-V to 5-V Input Voltage Range

Parametrics

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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)
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)    
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)    
LM36923 Order now 3     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)    
LM3697 Order now 3     2.7     5.5     0     40     1100     Inductive     30     30     Boost     1     91     Parallel     Backlighting, LED driver     I2C Control
OVP
PWM Control    
-40 to 125     DSBGA | 12     See datasheet (DSBGA)