LP8545SQX/NOPB
ActiveSIX CHANNEL HIGH-EFFICIENCY LED BACKLIGHT DRIVER FOR NOTEBOOKS WITH FLEXIBLE EXT/INT FET CONTROL
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LP8545SQX/NOPB
ActiveSIX CHANNEL HIGH-EFFICIENCY LED BACKLIGHT DRIVER FOR NOTEBOOKS WITH FLEXIBLE EXT/INT FET CONTROL
Technical Specifications
Parameters and characteristics for this part
| Specification | LP8545SQX/NOPB |
|---|---|
| Applications | Backlight |
| Current - Output / Channel | 50 mA |
| Dimming | PWM |
| Frequency | 625 kHz, 312 kHz, 156 kHz, 1.25 MHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 6 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -30 °C |
| Package / Case | 24-WFQFN Exposed Pad |
| Supplier Device Package | 24-WQFN (4x4) |
| Topology | Step-Up (Boost) |
| Type | DC DC Regulator |
| Voltage - Output | 40 V |
| Voltage - Supply (Max) [Max] | 22 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tape & Reel (TR) | 4500 | $ 1.25 | |
| Texas Instruments | LARGE T&R | 1 | $ 2.05 | |
| 100 | $ 1.69 | |||
| 250 | $ 1.22 | |||
| 1000 | $ 0.92 | |||
Description
General part information
LP8545 Series
The LP8545 is a white LED driver with integrated boost converter. It has six adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface.
The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.
LED outputs have 8-bit current resolution and up to 13-bit PWM resolution with additional 1-3 bit dithering to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.