LP5036RJVR

The LP503x device is a 30- or 36-channel constant-current sink LED driver. The LP503x features a 29kHz, 12-bit PWM generator for each channel, as well as independent color mixing and intensity control (previously known as brightness control registers) for channels/modules, enabling vivid LED effects with zero audible noise. Users can benefit from the device's ultra-low shutdown Iq power-saving mode, while designers can easily code software with the three programmable groups (R, G, B) of the LP503x. The LP503x device controls each LED output with 12-bit PWM resolution and a 29kHz switching frequency. This control helps achieve smoothly decreasing intensity and eliminates audible noise. The device has different color mixing and intensity control registers, making software coding very simple. When aiming for a fade-in/fade-out type breathing effect, the global R, G, B group control can significantly reduce the microcontroller load. The LP503x device can also implement the PWM phase-shifting function to help reduce the input power budget when multiple LEDs are turned on simultaneously. The LP503x device has an automatic power-saving mode, enabling ultra-low quiescent current. When all channels are turned off for 30ms, the total power consumption of the device drops to 10μA, making the LP503x device a potential alternative for battery-powered end devices. The LP503x device is a 30- or 36-channel constant-current-sink LED driver. The LP503x device includes all necessary power rails, an on-chip oscillator, and a two-wire serial I²C interface. The maximum constant-current value of all channels is set by a single external resistor. Two hardware address pins allow up to four devices on the same bus. An automatic power-saving mode is implemented to keep the total current consumption under 10 μA, which makes the LP503x device a potential choice for battery-powered end-equipment. The LP503x device is optimized for RGB LEDs regarding both live effects and software efforts. The LP503x device controls each LED output with 12-bit PWM resolution at 29-kHz switching frequency, which helps achieve a smooth dimming effect and eliminates audible noise. The independent color-mixing and intensity-control registers make the software coding straightforward. When targeting a fade-in, fade-out type breathing effect, the global RGB bank control reduces the microcontroller loading significantly. The LP503x device also implements a PWM phase-shifting function to help reduce the input power budget when LEDs turn on simultaneously.

Applications

• Smart speakers
• Smart home appliances
• Video doorbells
• Electronic smart locks
• Smoke detectors
• Set-top boxes
• Smart routers
• Handheld devices

Key features

• Operating voltage range: VCC range: 2.7V to 5.5V
• EN, SDA, and SCL pins compatible with 1.8V, 3.3V, and 5V supply rails
• Maximum output voltage: 6V
• 36-channel high-precision constant current sink
• Maximum current per channel: 25.5mA across full VCC range
• Maximum current per channel: 35mA when VCC ≥ 3.3V
• Device-to-device accuracy: ±5%; channel-to-channel accuracy: ±5%
• Ultra-low quiescent current: shutdown mode: 1μA (max), EN low; power-save mode: 12μA (max), EN high with all LEDs off for more than 30ms
• Integrated 12-bit 29kHz PWM generator per channel
• Independent color mixing register per channel
• Independent brightness control register per RGB LED module
• Selectable logarithmic or linear scale brightness control
• Integrated three-phase phase-shifted PWM scheme
• 3 programmable groups (R, G, B) for easy per-color software control
• 2 external hardware address pins supporting up to 4 devices
• Broadcast slave address for simultaneous multi-device configuration
• Auto-increment for read/write of multiple consecutive registers in a single transfer
• Fast-mode I²C speed up to 400kHz