LM3699 LED Driver Datasheet

LM3699 Datasheet, PDF, Equivalent


Part Number

LM3699

Description

High-Efficiency White LED Driver

Manufacture

etcTI

Total Page 25 Pages
Datasheet
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LM3699
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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, 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.
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%
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-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM3699
LM3699
SNVS821A – JANUARY 2014 – REVISED MARCH 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Terminal Configuration and Functions................ 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Handling Ratings....................................................... 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics .......................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Application .................................................. 10
9 Power Supply Recommendations...................... 15
10 Layout................................................................... 16
10.1 Layout Guidelines ................................................ 16
10.2 Layout Example .................................................... 18
11 Device and Documentation Support ................. 19
11.1 Device Support...................................................... 19
11.2 Trademarks ........................................................... 19
11.3 Electrostatic Discharge Caution ............................ 19
11.4 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
Changes from Original (January 2014) to Revision A
Page
• Changed to new TI data sheet format: adding Handling Ratings table and Device and Documentation Support sections .. 1
• Added new scope shot ........................................................................................................................................................ 14
2 Submit Documentation Feedback
Product Folder Links: LM3699
Copyright © 2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3699 SNVS821A – JANUARY 2014 – REVISED MARCH 2014 LM3699 High -Efficiency White LED Driver 1 Feature s •1 Drives Parallel High-Voltage LED Strings for Display or Keypad Lighting • Boost Converter up to 90% Efficien cy • 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 Cy cle Control • 24-V Overvoltage Protec tion Threshold • Fixed 1-MHz Switchin g Frequency • Integrated 1-A/40-V MOS FET • 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-eff iciency, PWMcontrolled power source for display backlight or keypad LEDs in sm artphone handsets. The highvoltage indu ctive boost converter with integrated 1 -A, 40-V MOSFET provides the power for three series LED strings. The boost output automatic.
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