LP55281 Datasheet, PDF (1/35 Pages) National Semiconductor (TI) – Quad RGB Driver

LP55281
www.ti.com
SNVS458B – JUNE 2007 – REVISED JUNE 2007
LP55281 Quad RGB Driver
Check for Samples: LP55281
FEATURES
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•23 Audio synchronization for a single fun light
LED
• 4 PWM controlled RGB LED drivers
• High efficiency Boost DC-DC converter
• SPI/I²C compatible interface
• 2 addresses in I²C compatible interface
• LED connectivity test through the serial
interface
• Small 36-bump Micro SMD (3 mm x 3 mm x 0.6
mm) or 36-bump Micro SMDxt package (3 mm
x 3 mm x 0.65 mm)
APPLICATIONS
• Cellular Phones
• PDAs, MP3 players
DESCRIPTION
LP55281 is a quad RGB LED driver for handheld devices. It can drive 4 RGB LED sets and a single fun light
LED. The boost DC-DC converter drives high current loads with high efficiency. The RGB driver can drive
individual color LEDs or RGB LEDs powered from boost output or external supply. Built-in audio synchronization
feature allows user to synchronize the fun light LED to audio inputs. The flexible SPI/I²C interface allows easy
control of LP55281. Small Micro SMD or Micro SMDxt package together with minimum number of external
components is a best fit for handheld devices. LP55281 has also a LED test feature, which can be used for
example in production for checking the LED connections.
Typical Application
BATTERY
C_IN
10 PF
C_VDD
100 nF
C_VDDA
1 éF
C_REF
100 nF
R_RGB
R_RT
MCU
C_VDDIO
100 nF
AUDIO
INPUTS
V_DD1
V_DD2
V_DDA
V_REF
IRGB
IRT
SO
SI/A0
SCK/SCL
SS/SDA
V_DDIO
IF_SEL
ASE1
ASE2
L_boost
4.7 PH
SW
D1
FB
R1
G1
B1
R2
G2
B2
LP55281
R3
G3
B3
R4
G4
B4
GNDs
ALED
I_MAX = 300...400 mA
V_OUT = 4...5.3V
C_OUT
10 PF
RGB1
RGB2
RGB3
RGB4
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
National Semiconductor is a registered trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 2007, Texas Instruments Incorporated