Overview
The LP5521YQX/NOPB, produced by Texas Instruments, is a three-channel RGB and white LED driver designed to produce a variety of lighting effects, particularly for mobile devices. This device features a high-efficiency charge pump that enables LED driving over the full Li-Ion battery voltage range. It includes internal program memory, allowing it to operate autonomously without external processor control, which enhances power savings. The LP5521 maintains excellent efficiency across a wide operating range by automatically selecting the proper charge pump gain based on LED forward voltage requirements and entering power-save mode when LED outputs are inactive.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Temperature Range | -30 | 85 | °C | |
| Supply Voltage (VDD) | 2.7 | 5.5 | V | |
| Standby Supply Current (EN = 0, CHIP_EN = 0) | 0.2 | 2 | μA | |
| Normal Mode Supply Current (Charge pump and LED drivers disabled) | 0.25 | 1.5 | mA | |
| Maximum Source Current (Outputs R, G, B) | 25.5 | mA | ||
| Output Current Accuracy | -4% | 4% | % | |
| LED PWM Switching Frequency (PWM_HF = 1) | 558 | Hz | ||
| LED PWM Switching Frequency (PWM_HF = 0) | 256 | Hz | ||
| Saturation Voltage (IOUT set to 17.5 mA) | 50 | 100 | mV |
Key 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
Applications
The LP5521YQX/NOPB is primarily used in mobile devices to create various lighting effects. It is suitable for applications requiring high-efficiency LED driving, such as:
- Smartphones and tablets
- Portable gaming devices
- Wearable technology
- Automotive infotainment systems
- Other battery-powered devices requiring advanced LED lighting
Q & A
- What is the primary function of the LP5521YQX/NOPB?
The LP5521YQX/NOPB is a three-channel RGB and white LED driver designed to produce a variety of lighting effects in mobile devices.
- What is the operating temperature range of the LP5521YQX/NOPB?
The operating temperature range is -30°C to 85°C.
- What is the supply voltage range for the LP5521YQX/NOPB?
The supply voltage range is 2.7 V to 5.5 V.
- Does the LP5521YQX/NOPB support autonomous operation?
- What type of interface does the LP5521YQX/NOPB use for communication?
The LP5521YQX/NOPB uses an I2C-compatible interface.
- How many LED channels does the LP5521YQX/NOPB support?
The LP5521YQX/NOPB supports three independent LED channels.
- What is the maximum source current for each LED channel?
The maximum source current for each LED channel is 25.5 mA.
- Does the LP5521YQX/NOPB have built-in protection features?
- Can multiple LP5521YQX/NOPB devices be connected in parallel?
- What is the typical shutdown current of the LP5521YQX/NOPB?
The typical shutdown current is 200 nA.
