LP55231 Datasheet, PDF (1/53 Pages) Texas Instruments – LP55231 Programmable 9-Output LED Driver

LP55231
www.ti.com
SNOSCR5 – MARCH 2013
LP55231 Programmable 9-Output LED Driver
Check for Samples: LP55231
FEATURES
1
•2 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 1x/1.5x Fractional
Charge Pump - Efficiency up to 94%
• LED Drive Efficiency Up to 93%
• Charge Pump With Soft Start and Over-
current/Short-circuit Protection
• Built-in LED Test
• 200 nA Typical Standby Current
• Automatic Power Save Mode; I_VDD = 10 µA
(Typ.)
• Two-wire I²C-compatible Control Interface
• Flexible Instruction Set
• Large SRAM Program Memory
• Small Application Circuit
• Source (High-side) Drivers
• Architecture Supports Color Control
APPLICATIONS
• Fun Lights and Indicator Lights
• LED Backlighting
• Haptic Feedback
• Programmable Current Source
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 maintains excellent efficiency 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 (typ).
Typical Application
C₁
C₂
0.47 PF 0.47 PF
V_IN = 2.7V TO 5.5V
C_IN
1 PF
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
C_OUT
1 PF
R
G
B
R
G
B
R
G
C₁
C₂
0.47 PF 0.47 PF
V_IN = 2.7V TO 5.5V
C_IN
1 PF
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
C_OUT
1 PF
B
RGB LED
APPLICATION
WLED APPLICATION
NOTE: D7, D8 AND D9 POWERED
DIRECTLY FROM V_IN
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated