LM3699 Texas instruments

LM3699

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LM3699

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Описание

The LM3699 is a three-string, high-efficiency, PWM-controlled power source for display backlight or keypad LEDs in smartphone handsets. The high-voltage inductive boost converter with integrated 1-A, 40-V MOSFET provides the power for three series LED strings. The boost output automatically adjusts to LED forward voltage to minimize headroom voltage and effectively improve LED efficiency. The ILOW terminal provides a method to quickly reduce LED brightness during camera flash operation. The LM3699 has integrated overvoltage, overcurrent, and thermal protection. 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 Parallel High-Voltage LED Strings
for Display or Keypad Lighting
Boost Converter up to 90% Efficiency
Four User-Selectable Full-Scale Current Settings
(20.2 mA, 18.6 mA, 17.0 mA, 15.4 mA)
Quick-Dimming Enable Terminal (ILOW)
Simple PWM Duty Cycle Control
24-V Overvoltage Protection Threshold
Fixed 1-MHz Switching Frequency
Integrated 1-A/40-V MOSFET
Three Current Sink Terminals
Adaptive Boost Output to LED Voltages
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)	24
Type	Inductive
Switching frequency (max) (kHz)	1120
Duty cycle (max) (%)	94
LED current per channel (mA)	20.2
Peak efficiency (%)	90
Topology	Boost
Features	CABC, Direct PWM Dimming, Enable/Shutdown, Integrated Switch, OVP, PWM control, Synchronous Rectification, Thermal shutdown
Operating temperature range (°C)	-40 to 125
Rating	Catalog