LM3633 Lighting Power Datasheet

LM3633 Datasheet, PDF, Equivalent


Part Number

LM3633

Description

Complete Lighting Power

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM3633 Datasheet


LM3633
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LM3633
SNVS867 – JUNE 2014
LM3633 Complete Lighting Power Solution for Smartphone Handsets
Check for Samples: LM3633
1 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-mA per Current Sink (Both Backlight and
Indicator)
• 11-Bit High-Voltage LED Dimming
• PWM Input for Content Adjustable Brightness
Control (CABC)
• Integrated 1-A/40-V MOSFET
• Adaptive Boost Output to LED Voltages
• Six Low-Voltage Current Sinks for Indicator LEDs
• Integrated Charge Pump for Improved Efficiency
and VIN Operating Range
• Internal Pattern Generation Engine for Each
Indicator LED
• Fully Configurable LED Grouping and Control
• Four Programmable Overvoltage Protection
Thresholds (16 V, 24 V, 32 V, and 40 V)
• Programmable 500-kHz and 1-MHz Switching
Frequency
• Overcurrent Protection
• Thermal Shutdown Protection
• 27 mm2 Total Solution Size
2 Applications
• Power Source for Smart Phone Illumination
• Display, Keypad and Indicator Illumination
• RGB Indicator Driver
space
Simplified Schematic
L
2.7V to 5.5V
VIN
CIN
D1
VOUT up to 40V
COUT
SDA
SCL
HWEN
PWM
IN SW OVP
LM3633 C+
C-
SDA
SCL
HWEN
HVLED1
HVLED2
HVLED3
CPOUT
PWM
PGND
LVLED1
LVLED2
LVLED3
LVLED4
LVLED5
LVLED6
CP
CPOUT
3 Description
The LM3633 11-bit LED driver provides high-
performance backlight dimming for 1, 2, or 3 parallel
high-voltage 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 LM3633 is a complete power source for
backlight, keypad, and indicator LEDs in smartphone
handsets. The high-voltage inductive boost converter
provides the power for three parallel LED strings
(HVLED1, HVLED2 and HVLED3). The integrated
charge pump provides the bias for the six low-voltage
indicator LEDs (LVLED1-LVLED6). All low-voltage
current sinks can have a programmable pattern
modulated onto their output current for a wide variety
of blinking patterns.
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 LM3633 is fully programmable 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3633
DSBGA (20)
2.04 mm x 1.78 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Dual String Efficiency vs VIN
92% L=22µH, fSW=1MHz
90%
88%
86%
84%
82%
80%
78%
76%
74%
72%
70%
2.5 3 3.5 4 4.5
VIN (V)
3s3p
4s3p
5s3p
6s3p
5 5.5
C002
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.

LM3633
LM3633
SNVS867 – JUNE 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin 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 Timing Requirements ................................................ 7
6.7 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 10
7.1 Overview ................................................................ 10
7.2 Functional Block Diagram ...................................... 10
7.3 Feature Description ................................................ 10
7.4 Device Functional Modes ....................................... 12
7.5 Register Descriptions .............................................. 24
8 Applications and Implementation ...................... 33
8.1 Application Information .......................................... 33
8.2 Typical Application .................................................. 33
8.3 Initialization Set Up ................................................. 45
9 Power Supply Recommendations...................... 48
10 Layout................................................................... 48
10.1 Layout Guidelines (Boost) .................................... 48
10.2 Layout Guidelines (Charge Pump)........................ 51
10.3 Layout Example ................................................... 52
11 Device and Documentation Support ................. 53
11.1 Device Support...................................................... 53
11.2 Trademarks ........................................................... 53
11.3 Electrostatic Discharge Caution ............................ 53
11.4 Glossary ................................................................ 53
12 Mechanical, Packaging, and Orderable
Information ........................................................... 53
4 Revision History
Date
June 2014
Revision
*
Notes
Initial release
2 Submit Documentation Feedback
Product Folder Links: LM3633
Copyright © 2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3633 SNVS867 – JUNE 2014 LM3633 Complete Lighting Power Solutio n for Smartphone Handsets Check for Sam ples: LM3633 1 Features •1 Drives Th ree Parallel High-Voltage LED Strings f or 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 (Both Backlight and Indicator) • 11-Bit Hi gh-Voltage LED Dimming • PWM Input fo r Content Adjustable Brightness Control (CABC) • Integrated 1-A/40-V MOSFET • Adaptive Boost Output to LED Voltag es • Six Low-Voltage Current Sinks fo r Indicator LEDs • Integrated Charge Pump for Improved Efficiency and VIN Op erating Range • Internal Pattern Gene ration Engine for Each Indicator LED Fully Configurable LED Grouping and C ontrol • Four Programmable Overvoltag e Protection Thresholds (16 V, 24 V, 32 V, and 40 V) • Programmable 500-kHz and 1-MHz Switching Frequency • Overcurrent Protecti.
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