LP8501 Datasheet, PDF (1/51 Pages) National Semiconductor (TI) – Multi-Purpose 9-Output LED Driver

LP8501
www.ti.com
SNVS548D – SEPTEMBER 2008 – REVISED AUGUST 2013
LP8501 Multi-Purpose 9-Output LED Driver
Check for Samples: LP8501
FEATURES
1
•2 Three Independent Program Execution
Engines for User-defined Programs with Large
SRAM Memory for Storing Lighting Programs
• 9 Programmable Source (High Side) Driver
Outputs with 25.5 mA Full-Scale Current, 8-bit
Current Setting Resolution and 12-Bit PWM
Control Resolution
• Flexible Grouping Possibility for All 9 Outputs
Including GPO into Three Groups with Group
PWM and Fade-In/ Fade-Out Controls
• Built-in LED Test
• Adaptive Charge Pump with 1x and 1.5x Gain
Provides up to 95% LED Drive Efficiency, with
Soft Start and Overcurrent/Short Circuit
Protection
• Automatic Power Save Mode; I_VDD = 10 µA
(typ.)
• Two Wire, I²C-Compatible, Control Interface
• Small Application Circuit
• Pin-configured LED Powering for LEDs 1 to 6
and for LEDs 7 to 9
• Solution Area <18 mm²
APPLICATIONS
• Fun Lights and Indicator Lights
• LED Backlighting and Color Keypad Lighting
• Programmable Current Source
• Haptic Feedback Driver and GPIO Expander
DESCRIPTION
The LP8501 is an LED driver with 9 outputs,
designed to produce versatile lighting effects for
mobile devices. The device is equipped with an
internal program memory, which allows operation
without processor control. Internal program memory
is used by three independent program execution
engines to produce user-defined lighting effects for
the outputs.
A high-efficiency charge pump enables LED driving
over full Li-Ion battery voltage range. The excellent
efficiency over a wide operating range is achieved by
autonomously selecting the best charge pump gain
based on LED forward voltage requirements. The
LP8501 is able to automatically enter power-save
mode when LED outputs are not active, thus lowering
idle current consumption down to 10 µA (typ.)
C₁
C₂
0.47 2F 0.47 2F
V_IN = 2.7V TO 5.5V
C_IN
1 2F
V_OUT
C1+ C1- C2+ C2- VOUT
VDD
D7
D1
VDD1_6
D2
VDD7_9
GPO
D8
INT _{LP8501 D3}
SCL
D4
SDA
MCU
EN
CLK
D9
D5
TRIG
GND
D6
C_OUT
1 2F
R
G
B
R
G
B
R
G
B
1
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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.
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