LM3697 Texas instruments

LM3697

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LM3697

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Описание

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.

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

Number of channels	3
Vin (min) (V)	2.7
Vin (max) (V)	5.5
Vout (min) (V)	0
Vout (max) (V)	40
Type	Inductive
Switching frequency (max) (kHz)	1100
Duty cycle (max) (%)	94
LED current per channel (mA)	30
Peak efficiency (%)	91
Topology	Boost
Features	I2C control, OVP, PWM control
Operating temperature range (°C)	-40 to 125
Rating	Catalog