LP55231_16 Datasheet, PDF (1/57 Pages) Texas Instruments – LP55231 Programmable 9-Output LED Driver

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LP55231
SNOSCR5B – MARCH 2013 – REVISED MAY 2016
LP55231 Programmable 9-Output LED Driver
1 Features
•1 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
2 Applications
• Fun Lights and Indicator Lights
• LED Backlighting
• Haptic Feedback
• Programmable Current Source
• Fire Notification
• Electronic Thermostats
• Electronic Locks
• Robotics
• Intruder Notification
• Light Switches and Dimmers
• Gaming and Smart Headphones
• Speakers
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
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Simplified Schematic
C1
C2
0.47 µF 0.47 µF
VIN = 2.7 V to 5.5 V
CIN
1 µF
MCU
C1+ C1- C2+ C2- VOUT
VDD
D7
D1
SCL
SDA
D2
EN
CLK
D8
LP55231
D3
INT
TRIG
D4
ASEL0
ASEL1
D9
GND
D5
D6
C1
C2
0.47 µF 0.47 µF
COUT1 µF
R
G
B
R
G
B
R
G
VIN = 2.7 V to 5.5 V
CIN
1 µF
MCU
C1+ C1- C2+ C2- VOUT
VDD
D1
D2
SCL
SDA
D3
EN
D4
CLK
LP55231
D5
INT
D6
TRIG
D7
ASEL0
ASEL1
D8
GND
D9
COUT1 µF
B
RGB LED
APPLICATION
WLED APPLICATION
NOTE: D7, D8 and D9 powered
directly from VIN
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.