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LM3699

Texas Instruments
Part Number LM3699
Manufacturer Texas Instruments
Description High-Efficiency White LED Driver
Published Mar 14, 2020
Detailed Description Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3699 SNVS821A – JANUARY 2014...
Datasheet PDF File LM3699 PDF File

LM3699
LM3699

Overview
Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3699 SNVS821A – JANUARY 2014 – REVISED MARCH 2014 LM3699 High-Efficiency White LED Driver 1 Features •1 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 3 Description The LM3699 is a three-string, high-efficiency, PWMcontrolled power source for display backlight or keypad LEDs in smartphone handsets.
The highvoltage 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.
2 Applications • Power Source for Smart Phone Illumination • Display or Keypad Illumination Device Information ORDER NUMBER PACKAGE BODY SIZE LM3699YFQ DSBGA (12) 1,64 mm x 1,29 mm Simplified Schematic VIN CIN L D1 VOUT up to 24V COUT ILOW RST PWM IN SW OVP IS1 IS0 ILOW HWEN PWM LM3699 HVLED1 HVLED2 HVLED3 GND Boost Efficiency vs VIN with 10-µH Inductor 90% 88% 86% EFFICIENCY (%) 84% 82% 80% 78% 76% 3s3p 74% 72% 70% 4s3p 5s3p 6s3p 2.
5 3 3.
5 4 4.
5 5 5.
5 VIN (V) C012 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-cri...


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