LP55231 Texas instruments

LP55231

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LP55231

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Описание

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.

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; I_VDD = 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

Number of channels	9
LED current per channel (mA)	25.5
LED configuration	Parallel
Program memory	Yes
Topology	Charge pump
Programmable ramp control	Yes
Vin (min) (V)	2.7
Vin (max) (V)	5.5
Iout (max) (A)	0.0255
Features	Analog/PWM mixed dimming, Constant current, Current control, I2C control, Power-save mode, Programmable lighting engines
Iq (typ) (mA)	0.8
Shutdown current (ISD) (typ) (µA)	0.2
Operating temperature range (°C)	-30 to 85
Rating	Catalog