Overview
The LP5024RSMR from Texas Instruments is a 24-channel I2C constant-current RGB LED driver designed for high-performance applications in smart homes and other human-machine interaction environments. This device is part of the LP50xx series, which includes integrated color mixing and brightness control, making it ideal for LED animation effects such as flashing, breathing, and chasing. The LP5024RSMR simplifies software coding with pre-configured settings and minimizes system noise, enhancing user experience.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range (VCC) | 2.7 to 5.5 | V |
| EN, SDA, and SCL Pin Compatibility | 1.8V, 3.3V, 5V | V |
| Output Maximum Voltage | 6 | V |
| Maximum Sink Current per Channel (VCC in full range) | 25.5 mA | mA |
| Maximum Sink Current per Channel (VCC ≥ 3.3V) | 35 mA | mA |
| Device-to-Device Error | ±7% | % |
| Channel-to-Channel Error | ±7% | % |
| Quiescent Current in Shutdown Mode | 1 µA (max) | µA |
| Quiescent Current in Power Saving Mode | 10 µA (typical) | µA |
| PWM Switching Frequency | 29 kHz | kHz |
| I2C Speed | Up to 400 kHz | kHz |
| Package Type | 32-pin VQFN (RSM) with Exposed Thermal Pad | |
| Operating Temperature Range | -40 to 85 °C | °C |
Key Features
- 24 constant-current sinks with high precision
- Integrated 12-bit, 29kHz PWM generator for each channel
- Independent color-mixing and brightness-control registers per channel
- Optional logarithmic- or linear-scale brightness control
- Integrated 3-phase PWM-shifting scheme to reduce input power budget
- 3 programmable banks (R, G, B) for easy software control of each color
- 2 external hardware address pins allowing connection of up to 4 devices
- Broadcast slave address for configuring multiple devices simultaneously
- Auto-increment feature for writing or reading consecutive registers within one transmission
- Ultralow quiescent current in shutdown and power-saving modes
Applications
- Smart speaker (with voice assistant)
- Smart home appliances
- Video doorbell
- Electronic smart lock
- Smoke and heat detector
- Set-top box (STB) and digital video recorder (DVR)
- Smart router
- Handheld devices
Q & A
- What is the operating voltage range of the LP5024RSMR?
The operating voltage range is 2.7V to 5.5V.
- How many constant-current sinks does the LP5024RSMR have?
The LP5024RSMR has 24 constant-current sinks.
- What is the maximum sink current per channel when VCC is in the full range?
The maximum sink current per channel is 25.5 mA when VCC is in the full range.
- What is the maximum sink current per channel when VCC ≥ 3.3V?
The maximum sink current per channel is 35 mA when VCC ≥ 3.3V.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is 1 µA (maximum).
- What is the quiescent current in power-saving mode?
The quiescent current in power-saving mode is 10 µA (typical) when all LEDs are off for more than 30ms.
- What is the PWM switching frequency of the LP5024RSMR?
The PWM switching frequency is 29 kHz.
- What is the maximum I2C speed supported by the LP5024RSMR?
The maximum I2C speed supported is up to 400 kHz.
- What package type does the LP5024RSMR come in?
The LP5024RSMR comes in a 32-pin VQFN (RSM) package with an exposed thermal pad.
- What is the operating temperature range of the LP5024RSMR?
The operating temperature range is -40 to 85 °C.
