LM2755TMX/NOPB
ActiveCHARGE PUMP LED CONTROLLER WITH I2C COMPATIBLE INTERFACE IN MICRO SMD
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LM2755TMX/NOPB
ActiveCHARGE PUMP LED CONTROLLER WITH I2C COMPATIBLE INTERFACE IN MICRO SMD
Technical Specifications
Parameters and characteristics for this part
| Specification | LM2755TMX/NOPB |
|---|---|
| Applications | Backlight |
| Current - Output / Channel | 30 mA |
| Dimming | I2C |
| Frequency | 1.25 MHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 3 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -30 °C |
| Package / Case | 18-WFBGA |
| Supplier Device Package | 18-DSBGA |
| Topology | Switched Capacitor (Charge Pump) |
| Type | DC DC Regulator |
| Voltage - Supply (Max) | 5.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 1.65 | |
| 10 | $ 1.48 | |||
| 25 | $ 1.40 | |||
| 100 | $ 1.15 | |||
| 250 | $ 1.08 | |||
| 500 | $ 0.95 | |||
| 1000 | $ 0.75 | |||
| Digi-Reel® | 1 | $ 1.65 | ||
| 10 | $ 1.48 | |||
| 25 | $ 1.40 | |||
| 100 | $ 1.15 | |||
| 250 | $ 1.08 | |||
| 500 | $ 0.95 | |||
| 1000 | $ 0.75 | |||
| Tape & Reel (TR) | 3000 | $ 0.70 | ||
| 6000 | $ 0.67 | |||
| 9000 | $ 0.65 | |||
| 15000 | $ 0.63 | |||
| Texas Instruments | LARGE T&R | 1 | $ 1.23 | |
| 100 | $ 0.94 | |||
| 250 | $ 0.69 | |||
| 1000 | $ 0.50 | |||
Description
General part information
LM2755 Series
The LM2755 is a charge-pump-based, constant current LED driver capable of driving 3 LEDs with a total output current up to 90mA. The diode current waveforms of each LED can be trapezoidal with timing and level parameters (rise time, fall time, high level, low level, delay, high time, low time) programmed via an I2C-compatible interface. The 32 brightness levels found on the LM2755 are exponentially spaced (as opposed to linearly spaced) to better match the response of the human eye to changing brightness levels.
The device requires only four small and low-cost ceramic capacitors. The LM2755 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements.
The pre-regulation scheme used by the LM2755 is optimized to ensure low conducted noise on the input. An internal soft-start circuitry eliminates high inrush current at start-up. The LM2755 consumes 3µA (typ.) of supply current in shut-down.
Documents
Technical documentation and resources
