SNOSCR5D March 2013 – December 2016 LP55231
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Electrical Characteristics
- 6.6 Charge Pump Electrical Characteristics
- 6.7 LED Driver Electrical Characteristics
- 6.8 LED Test Electrical Characteristics
- 6.9 Logic Interface Characteristics
- 6.10 Recommended External Clock Source Conditions
- 6.11 Serial Bus Timing Parameters (SDA, SCL)
- 6.12 Typical Characteristics
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3 Feature Description
- 7.4 Device Functional Modes
- 7.5 Programming
- 7.6 Register Maps
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
- RTW|24
Thermal pad, mechanical data (Package|Pins)
- RTW|24
Orderable Information
1 Features
- 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
2 Applications
3 Description
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.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LP55231 | WQFN (24) | 4.00 mm × 4.00 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
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Typical Application
4 Revision History
Changes from C Revision (November 2016) to D Revision
- Added top nav icon for TI Designs Go
- Changed variable 1 spanning to go from Bit [3] to Bit [2] and variable 2 span from Bit [1] to Bit [0] in table 7 Go
Changes from B Revision (May 2016) to C Revision
- Changed wording of data sheet titleGo
Changes from A Revision (October 2014) to B Revision
- Added several new Applications Go
- Changed Handling Ratings to ESD Ratings; moved storage temperature to Abs Max table Go
- Changed RθJA value from 36.6C/W to 33.3C/W; add additional thermal informationGo
- Added Community Resources section Go
Changes from * Revision (March 2013) to A Revision
- Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section Go