3 channel RGB/White LED driver with internal program memory and integrated charge pump - LP5521

LP5521 (ACTIVE)

3 channel RGB/White LED driver with internal program memory and integrated charge pump

 

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.

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • 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

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Parametrics Compare all products in RGB & White LED Driver

 
Channels (#)
LED Current Per Channel (mA)
LED Configuration
LED (#)
Program Memory
Programmable Ramp Control
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Iq (Typ) (mA)
Shutdown Current (Typ) (uA)
Peak Efficiency (%)
Features
Rating
Operating Temperature Range (C)
Pin/Package
LP5521 LP5523 LP55231 LP5562 LP5569
3    9    9    4    9   
25.5    25.5    25.5    25.5    25.5   
Parallel    Parallel    Parallel    Parallel    Parallel   
3    9    9    4    9   
Yes    Yes    Yes    Yes    Yes   
Yes    Yes    Yes    Yes    Yes   
2.7    2.7    2.7    2.7    2.5   
5.5    5.5    5.5    5.5    5.5   
2.7    2.7    2.7    2.7    2.5   
5.5    5.5    5.5    5.5    5.5   
0.0765    0.225    0.0255    0.11    0.23   
1.5    0.8    0.8    1    0.002   
0.2    0.2    0.2    0.2    0.2   
95    93    94    100    94   
Analog/PWM Mixed Dimming
Constant Current
Current Control
I2C Control
Programmable Lighting Engines   
Analog/PWM Mixed Dimming
Constant Current
Current Control
I2C Control
Programmable Lighting Engines   
Analog/PWM Mixed Dimming
Constant Current
Current Control
I2C Control
Programmable Lighting Engines   
Analog/PWM Mixed Dimming
Constant Current
Current Control
I2C Control
Programmable Lighting Engines   
Analog/PWM Mixed Dimming
Constant Current
Current Control
Direct PWM Dimming
I2C Control
Programmable Lighting Engines   
Catalog    Catalog    Catalog    Catalog    Catalog   
-30 to 85    -30 to 85    -30 to 85    -40 to 85    -40 to 85   
20DSBGA
24WQFN   
25DSBGA    24WQFN    12DSBGA    24WQFN   

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