LM36922 High Efficiency, Dual-String, 30-V Synchronous White LED Driver | TI.com

LM36922 (ACTIVE)

High Efficiency, Dual-String, 30-V Synchronous White LED Driver

 

Recommended alternative parts

  • LM36923  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Three Channel backlight w/ CABC support, 11-bit Dimming
  • TPS61162  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Dual Channel backlight w/ PWM brightness control
  • LM3697  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Three channel backlight 2/ 11-bit dimming

Description

The LM36922 is an ultra-compact, highly efficient, two string white-LED driver designed for LCD display backlighting. The device can power up to 8 series LEDs at up to 25 mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation.

The LED current is adjusted via an I2C interface or through a logic level PWM input. The PWM duty cycle is internally sensed and mapped to an 11-bit current thus allowing for a wide range of PWM frequencies and noise-free operation.

The device operates over the 2.5-V to 5.5-V input voltage range and –40°C to 85°C temperature range.

Features

  • 1% Matched Current Sinks Across (Process,
    Voltage, Temp)
  • 3% Current Sink Accuracy Across (Process,
    Voltage, Temp)
  • 11-Bit Dimming Resolution
  • Up to 91.6% Solution Efficiency
  • Drives from One to Two Parallel LED Strings at up
    to 28 V
  • PWM Dimming Input
  • I2C Programmable
  • Selectable 500-kHz and 1-MHz Switching
    Frequency with Optional –12% shift
  • Auto Switch Frequency Mode (250 kHz, 500 kHz,
    1 MHz)
  • Four Configurable Overvoltage Protection
    Thresholds (17 V, 21 V, 25 V, 29 V)
  • Four Configurable Overcurrent Protection
    Thresholds (750 mA, 1000 mA, 1250 mA, 1500
    mA)
  • Thermal Shutdown Protection

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)
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)    
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)    
TPS61161 Order now 1     2.7     18     2.7     38     600     Inductive     20     10     Boost     1     90     Series