LM3633
- 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
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.
For all available packages, see the orderable addendum at the end of the datasheet.Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3633 Complete Lighting Power Solution for Smartphone Handsets datasheet | PDF | HTML | 04 Jun 2014 |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| 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 | ||
| EVM User's guide | LM3633 User's Guide | 05 Jun 2014 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
LM3633SW-LINUX — Linux Driver for LM3633
Linux Mainline Status
Available in Linux Main line: No
Available through git.ti.com: (...)
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFQ) | 20 | Ultra Librarian |
Ordering & quality
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- Lead finish/Ball material
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Support & training
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