Texas Instruments LM3697
The LM3697 11-bit LED driver provides highperformance 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.| Part No. | LM3697 |
|---|---|
| Datasheet | LM3697 Download |
| Manufacturer |  Texas Instruments |
| Description | High-efficiency three-string white LED driver |
| Buy | Stock & Price |
FEATURES
●1 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 2
APPLICATIONS
● Power source for smart phone illumination● Display, keypad, and indicator illumination VIN = 2.7V to 5.5V VIN Simplified Schematic L D1 CIN VOUT up to 40V COUT IN SDA SCL HWEN PWM LM3697 SW OVP HVLED1 HVLED2 HVLED3 PGND 3
DESCRIPTION
The high-voltage inductive boost converter provides the power for three-series LED strings for display backlight and keypad functions (HVLED1, HVLED2, and HVLED3).
