GUI for evaluation module (EVM)
Data sheet
LM3533
- Drives Two 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) - 14-Bit Equivalent Exponential Dimming With 8-Bit
Programmable Backlight Code - Selectable Analog ALS Input with 128
Programmable Gain-Setting Resistors or PWM
ALS Input With Internal Low-Pass Filter - PWM Input for Content Adjustable Brightness
Control - Five Low-Voltage Current Sinks for Indicator LEDs
- Integrated Charge Pump for Improved Efficiency
and VIN Operating Range - Internal Pattern Generation Engine
- 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 - 27-mm2 Total Solution Size
The LM3533 is a complete power source for backlight, keypad, and indicator LEDs in smartphone handsets. The high-voltage inductive boost converter provides the power for two series LED strings for display backlight and keypad functions (HVLED1 and HVLED2). The integrated charge pump provides the bias for the five low-voltage indicator LED current sinks (LVLED1 to LVLED5). All low-voltage current sinks can have a programmable pattern modulated onto their output current for a wide variety of blinking patterns.
Additional features include a pulse width modulation (PWM) control input for content adjustable backlight control (CABC), and an ambient light sensor interface (ALS) with an internal 8-bit ADC to provide automatic current adjustment based upon ambient light conditions. Both the PWM and ALS inputs can be used to control any high- or low-voltage current sink.
The LM3533 is fully programmable via an I2C-compatible interface. The device is available in a 20-pin DSBGA and operates over a 2.7-V to 5.5-V input voltage range and a −40°C to +85°C temperature range.
Technical documentation
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View all 8 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3533 Complete Lighting Power Solution for Smartphone Handsets datasheet (Rev. C) | PDF | HTML | 27 Sep 2015 |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Analog PWM Dimming in White-LED Drivers | 21 Dec 2016 | ||
| Application note | Inductor Selection in Boost Converters for LCD Backlight Applications | 24 Oct 2016 | ||
| Application note | Schottky Diode Selection in Asynchronous Boost Converters | 06 Sep 2016 | ||
| User guide | AN-2250 LM3533 Evaluation Kit (Rev. B) | 30 Apr 2013 | ||
| User guide | AN-2250 LM3533 Evaluation Kit | 21 Jun 2012 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM3533EVAL — LM3533 Evaluation Module
The LM3533 Evaluation Module (LM3533EVM) is designed to fully evaluate the LM3533 Dual String backlight driver + 5 indicatorLED driver. The LM3533EVM consists of the National Semiconductor USB Interface Board and the LM3533 EvaluationBoard. The Texas Instruments USB Interface Board Rev 1.1 provides (...)
User guide: PDF
Driver or library
LM3533SW-LINUX — Linux Driver for LM3533
The Linux driver supports the LM3533 Complete lighting solution for smartphone handsets. The Linux driver supports communication through the I2C bus and interfaces with various sub-systems.
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- (...)
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFQ) | 20 | Ultra Librarian |
Ordering & quality
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