National LM2756 Data Handbook / Specifications
Summary
The LM2756 is a highly integrated, inductorless LED driver designed for complex display applications requiring precise illumination control. This component can simultaneously drive up to 8 LEDs across independently configurable groups—ideal for main displays, keypads, and indicator lights. It offers advanced features such as 32 exponential dimming steps and high efficiency in an ultra-compact micro SMD package (2.7V–5.5V input). The manual provides comprehensive technical specifications, pin descriptions, and application guidelines to ensure seamless implementation in portable electronics requiring superior LCD backlighting or multi-display functionality.
Page 1 Text Content
lti-D is la In to rle riv r w ith tia l D im in te in ic ro
December 5, 2007
LM2756 Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in micro SMD General Description Features The LM2756 is a highly integrated, switched-capacitor, multi- Drives up to 8 LEDs with up to 30m A of Diode Current display LED driver that can drive up to 8 LEDs in parallel with Each a total output current of 180m A. Regulated internal current 32 Exponential Dimming Steps with 800:1 Dimming Ratio sources deliver excellent current and brightness matching in for Group A (Up to 6 LEDs) all LEDs.
8 Linear Dimming States for Groups B (Up to 3 LEDs) and
The LED driver current sinks are split into three independently D1C (1 LED) controlled groups. The primary group (Group A) can be con- Programmable Auto-Dimming Function figured to drive four, five or six LEDs for use in the main phone
3 Independently Controlled LED Groups Via I2C
display, while the secondary group (Group B) can be config-
Compatible Interface
ured to drive one, two or three LEDs for driving secondary
Up to 90% Efficiency
displays, keypads and/or indicator LEDs. An additional driver,
Total Solution Size < 21mm2
D1C, is provided for additional indicator lighting functions.
Low Profile 20 Bump micro SMD Package
The device provides excellent efficiency without the use of an
(1.615mm × 2.015mm × 0.6mm)
inductor by operating the charge pump in a gain of 3/2 or in
Pass-Mode. The proper gain for maintaining current regula- 0.4% Accurate Current Matching
tion is chosen, based on LED forward voltage, so that effi- Internal Soft-Start Limits Inrush Current ciency is maximized over the input voltage range.
True Shutdown Isolation for LED’s
The LM2756 is available in National’s tiny 20-bump, 0.4mm
Wide Input Voltage Range (2.7V to 5.5V)
pitch, thin micro SMD package.
Active High Hardware Enable
Applications Dual Display LCD Backlighting for Portable Applications Large Format LCD Backlighting Display Backlighting with Indicator Light
Typical Application Circuit
© 2007 National Semiconductor Corporation www.national.com
Page Summary Contents For National LM2756 Data Handbook / Specifications
Manual Details
| Brand | National |
|---|---|
| Pages | 16 |
| File Size | 511.47 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
How many dimming steps does the LM2756 offer?
It provides 32 Exponential Dimming Steps with an improvement ratio up to 800:1.
What is the operational input voltage range for this driver?
The device operates within an input voltage range of 2.7V to 5.5V.
Can I control multiple LED areas separately?
Yes, it supports three independently controlled groups: Group A (primary), Group B (secondary), and a separate indicator LED.
What physical package is used for this driver?
It comes in a low profile 20-bump micro SMD Package (1.615mm × 2.015mm × 0.6mm).
What ESD precautions are necessary when installing the device?
All integrated circuits must be handled with appropriate ESD precautions, specifically Human Body Model 2.0kV.