LM3697 Datasheet | Texas Instruments

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 m A 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-k Hz 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 VOUT up to 40V COUT SDA SCL HWEN SW OVP HVLED1 HVLED2 HVLED3 PGND 3 Description 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. 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 highvoltage current sink. The LM3697 is fully configurable via an I2Cpatible 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. Device Information(1) ORDER NUMBER PACKAGE BODY SIZE (MAX) DSBGA (12) 1.64 mm × 1.29 mm (1) For all available packages, see the orderable addendum at the end of...