パッケージ情報
| パッケージ | ピン数 WQFN (RTW) | 24 |
| 動作温度範囲 (℃) -30 to 85 |
| パッケージ数量 | キャリア 250 | SMALL T&R |
LP55231 の特徴
- Three
Independent Program Execution Engines, 9 Programmable Outputs With 25.5-mA Full-Scale Current,
8-Bit Current Setting Resolution and
12-Bit PWM Control Resolution - Adaptive High-Efficiency 1×/1.5× Fractional Charge Pump - Efficiency up to 94%
- LED Drive Efficiency Up to 93%
- Charge Pump With Soft Start
- Overcurrent and Short-Circuit Protection
- Built-in LED Test
- 200-nA Typical Standby Current
- Automatic Power Save Mode; IVDD = 10 µA (Typical)
- Two-Wire I2C-Compatible Control Interface
- Flexible Instruction Set
- Large SRAM Program Memory
- Small Application Circuit
- Source (High-Side) Drivers
- Architecture Supports Color Control
LP55231 に関する概要
The LP55231 is a 9-channel LED driver designed to produce lighting effects for mobile devices. A high-efficiency charge pump enables LED driving over full Li-Ion battery voltage range. The device is equipped with an internal program memory, which allows operation without processor control.
The LP55231 has an I2C-compatible control interface with four pin-selectable addresses. The INT pin can be used to notify processor when a lighting sequence has ended (interrupt function). Also, the device has a trigger input interface, which allows synchronization, for example, between multiple LP55231 devices. Excellent efficiency is maintained over a wide operating range by autonomously selecting the best charge pump gain based on LED forward voltage requirements. The device is able to automatically enter power-save mode when LED outputs are not active, thus lowering idle current consumption down to 10 µA (typical). Only four small and low-cost ceramic capacitors are required.
For all available packages, see the orderable addendum at the end of the data sheet.