Overview
The LP5521YQ/NOPB is a three-channel RGB and white LED driver produced by Texas Instruments. This device is designed to produce a variety of lighting effects, particularly in mobile devices. It features a high-efficiency charge pump that enables LED driving over the full Li-Ion battery voltage range. The LP5521YQ/NOPB includes internal program memory, allowing it to operate autonomously without external processor control, which helps in power savings. The device is known for its low power consumption, high efficiency, and the ability to automatically enter power-save mode when LED outputs are not active.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 3 | - |
| LED Current per Channel | 25.5 | mA |
| LED Configuration | Parallel | - |
| Program Memory | Yes | - |
| Regulator Topology | Charge Pump | - |
| Vin (Min) | 2.7 | V |
| Vin (Max) | 5.5 | V |
| Operating Temperature Range | -30 to 85 | °C |
| Shutdown Current (Typ) | 0.2 | µA |
| Package Type | WQFN-24 | - |
Key Features
- Adaptive Charge Pump with 1× and 1.5× gain, providing 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
- 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 of 50 mV and current matching of 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 LP5521YQ/NOPB is suitable for various applications, particularly in mobile devices where efficient LED lighting is crucial. It is used in:
- Smartphones and tablets for backlighting and notification LEDs
- Portable gaming devices for RGB lighting effects
- Wearable devices for power-efficient LED lighting
- Other handheld electronic devices requiring advanced LED lighting solutions
Q & A
- What is the primary function of the LP5521YQ/NOPB?
The LP5521YQ/NOPB is a three-channel RGB and white LED driver designed to produce a variety of lighting effects in mobile devices.
- What is the efficiency of the charge pump in the LP5521YQ/NOPB?
The charge pump in the LP5521YQ/NOPB provides up to 95% LED drive efficiency.
- Does the LP5521YQ/NOPB require external components like inductors or resistors?
No, the LP5521YQ/NOPB does not require inductors or resistors, making it a very small solution.
- How does the LP5521YQ/NOPB manage power consumption when LEDs are not active?
The device automatically enters power-save mode when LED outputs are not active, thus lowering current consumption.
- What type of interface does the LP5521YQ/NOPB use for communication?
The LP5521YQ/NOPB uses an I2C-compatible interface for communication.
- Can the LP5521YQ/NOPB operate autonomously without external processor control?
Yes, the LP5521YQ/NOPB can operate autonomously once the program memory has been loaded, allowing for power savings.
- What is the typical shutdown current of the LP5521YQ/NOPB?
The typical shutdown current of the LP5521YQ/NOPB is 0.2 µA.
- What is the operating temperature range of the LP5521YQ/NOPB?
The operating temperature range of the LP5521YQ/NOPB is -30 to 85 °C.
- How many channels does the LP5521YQ/NOPB support?
The LP5521YQ/NOPB supports three independent LED channels.
- What type of package does the LP5521YQ/NOPB come in?
The LP5521YQ/NOPB comes in a 24-pin WQFN (NJA) package.
