LM2755 Overview
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. SDIO D1 VIO D2 SYNC HWEN C2 COUT ADR VIO SCL SDIO SYNC HWEN C1 Dx Pins CIN RSET Figure 1. Typical Application Circuit Figure 2. Minimum Solution Size 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical
LM2755 Key Features
- 2 90% Peak Efficiency
- Total solution size < 13mm2
- No Inductor Required: Only 4 Inexpensive
- 3 Independently Controlled Constant Current
- Programmable Trapezoidal Dimming
- Programmable Timing Control Via Internal
- 32 Exponential Dimming Steps with 800:1 Dimming Ratio
- Programmable Brightness Control via I2Cpatible Interface
- Hardware Enable Pin
- Wide Input Voltage Range: 2.7V to 5.5V
