LP8501
LP8501 PRODUCT BRIEF Multi-Purpose 9-Output LED Driver
Literature Number: SNVS548B
November 20, 2008
LP8501 PRODUCT BRIEF
Multi-Purpose 9-Output LED Driver
General Description
The LP8501 is a LED driver with 9 outputs, designed to pro-
duce versatile lighting effects for mobile devices. The device
is equipped with an internal program memory, which allows
operation without processor control. Internal program mem-
ory 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. 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.)
The device has a flexible General Purpose Output (GPO),
which can be used for example as a digital control pin for other
devices. INT pin (interrupt function), which can be used to
notify processor. Trigger input interface, which allows pro-
gram execution start without I2C write.
The device requires only four small and low-cost ceramic ca-
pacitors. The LP8501 is available in a tiny 25–bump 2.27 mm
x 2.27 mm x 0.60 mm micro SMD package (0.4 mm pitch).
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples,
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html
Features
■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 and with soft start and
overcurrent/short circuit protection
■Automatic power save mode; IVDD = 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
Typical Application
30041901
© 2008 National Semiconductor Corporation 300419 www.national.com
LP8501 PRODUCT BRIEF
LP8501 PRODUCT BRIEF
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