LM3697 3 String Backlight Driver with 11-bits of Exponential Dimming | TI.com

LM3697 (ACTIVE) 3 String Backlight Driver with 11-bits of Exponential Dimming

 

Description

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.

Features

  • 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

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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)
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)    
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)    
LM36273 Order now 3     2.7     5     27     30     1050     Inductive     30     24     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)    
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)    
LM3631 Order now 2     2.7     5.0     0     30