LP5521 Datasheet, PDF (1/48 Pages) National Semiconductor (TI) – Programmable Three Channel LED Driver

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LP5521
SNVS441H – JANUARY 2007 – REVISED MAY 2016
LP5521 Programmable Three-Channel LED Driver
1 Features
•1 Adaptive Charge Pump With 1× and 1.5× Gain
Provides Up to 95% LED Drive Efficiency
• Charge Pump with Soft Start and Overcurrent,
Short-Circuit Protection
• Low Input Ripple and EMI
• Very Small Solution Size, No Inductor or Resistors
Required
• 200-nA Typical Shutdown Current
• Automatic Power Save Mode
• I²C-Compatible Interface
• Independently Programmable Constant Current
Outputs with 8-Bit Current Setting and 8-Bit PWM
Control
• Typical LED Output Saturation Voltage 50 mV and
Current Matching 1%
• Three Program Execution Engines with Flexible
Instruction Set
• Autonomous Operation Without External Control
• Large SRAM Program Memory
• Two General Purpose Digital Outputs
2 Applications
• Fun and Indicator Lights
• LCD Sub-Display Backlighting
• Keypad RGB Backlighting and Phone Cosmetics
• Vibra, Speakers, Waveform Generator
• Blood Glucose Meter
• Handheld POS Terminals
• Electronic Access Control
• Where RGB Indication is Needed
Typical Application Circuit
CFLY1
CFLY2
CIN
1 µF
0.47 µF
0.47 µF
CFLY1P
VDD
CFLY1N CFLY2P CFLY2N
VOUT
COUT
1 µF
3 Description
The LP5521 is a three-channel LED driver designed
to produce variety of lighting effects for mobile
devices. A high-efficiency charge pump enables LED
driving over full Li-Ion battery voltage range. The
device has a program memory for creating variety of
lighting sequences. When program memory has been
loaded, LP5521 can operate autonomously without
processor control allowing power savings.
The device maintains excellent efficiency over a wide
operating range by automatically selecting proper
charge pump gain based on LED forward voltage
requirements and is able to automatically enter
power-save mode, when LED outputs are not active
and thus lowering current consumption.
Three independent LED channels have accurate
programmable current sources and PWM control.
Each channel has program memory for creating
desired lighting sequences with PWM control.
The LP5521 has a flexible digital interface. Trigger
I/O and a 32-kHz clock input allow synchronization
between multiple devices. Interrupt output can be
used to notify processor, when LED sequence has
ended. The LP5521 has four pin selectable I²C-
compatible addresses. This allows connecting up to
four parallel devices in one I²C-compatible bus. GPO
and INT pins can be used as a digital control pin for
other devices.
The LP5521 requires only four small, low-cost
ceramic capacitors.
Comprehensive application tools are available,
including command compiler for easy LED sequence
programming.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE
LP5521TM
DSBGA (20) 2.093 mm × 1.733 mm (MAX)
LP5521YQ
WQFN (24) 5.00 mm × 4.00 mm (NOM)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
MCU
SCL
SDA
EN
CLK_32K
INT
TRIG
ADDR_SEL0
ADDR_SEL1
LP5521
GNDs
RGB LED 0...25.5 mA/LED
R
G
B
GPO
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.