LM36922H Highly Efficient Dual-String White LED Driver | TI.com

LM36922H
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Highly Efficient Dual-String White LED Driver

 

Description

The LM36922H is an ultra-compact, highly efficient, two-string white-LED driver designed for LCD display backlighting. The device can power up to 12 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 with noise-free operation from 50 µA to 25 mA.

Other features include an auto-frequency mode, which can automatically change the frequency based on load current in order to optimize efficiency.

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

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • 1% Matched Current Sinks Across Process, Voltage, Temperature
  • 3% Current-Sink Accuracy Across Process, Voltage, Temperature
  • 11-Bit Dimming Resolution
  • Up to 90% Solution Efficiency
  • Drives from One to Two Parallel LED Strings at up to 38 V at 25 mA per String
  • 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, 24 V, 31 V, 38 V)
  • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA,
    1500 mA)
  • Thermal Shutdown Protection
  • Externally Selectable I2C Address Options via ASEL Input

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)
LM36922H Order now 2     2.5     5.5     37     40     1050     Inductive     30     20     Boost
Current Sink
Multi-Channel    
1.2     92     Parallel
Series    
  Adjustable Switch Frequency
CABC
Direct PWM Dimming
I2C Control
OVP
Thermal Shutdown    
-40 to 85     DSBGA | 12     12DSBGA: 2 mm2: 1.16 x 2 (DSBGA | 12)    
LM36272 Order now 2     2.7     5     27     30     1050     Inductive     30     16     Boost
Current Sink    
1.2     92     Parallel
Series    
  Adjustable Switch Frequency
CABC
Direct PWM Dimming
I2C Control
OVP
Thermal Shutdown    
-40 to 85     DSBGA | 24     See datasheet (DSBGA)    
LM36923H Order now 3     2.5     5.5     0     37     1050     Inductive     30     30     Boost
Current Sink
Multi-Channel    
1.2     92     Parallel
Series    
  Adjustable Switch Frequency
CABC
Direct PWM Dimming
Enable/Shutdown
I2C Control
OVP
Thermal Shutdown    
-40 to 85     DSBGA | 12     12DSBGA: 2 mm2: 1.16 x 2 (DSBGA | 12)    
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