LP8543SQX/NOPB
ActiveSMBUS/I2C CONTROLLED WLED DRIVER FOR MEDIUM SIZED LCD BACKLIGHT
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LP8543SQX/NOPB
ActiveSMBUS/I2C CONTROLLED WLED DRIVER FOR MEDIUM SIZED LCD BACKLIGHT
Technical Specifications
Parameters and characteristics for this part
| Specification | LP8543SQX/NOPB |
|---|---|
| Applications | Backlight |
| Current - Output / Channel | 60 mA |
| Dimming | PWM |
| Frequency [Max] | 1.25 MHz |
| Frequency [Min] | 625 kHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 7 |
| 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 |
| Voltage - Supply (Min) [Min] | 5.5 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 | $ 1.14 | |
| Texas Instruments | LARGE T&R | 1 | $ 2.05 | |
| 100 | $ 1.69 | |||
| 250 | $ 1.22 | |||
| 1000 | $ 0.92 | |||
Description
General part information
LP8543 Series
The LP8543 is a white LED driver with integrated boost converter. It has 7 adjustable current sinks which can be controlled by SMBus or I2C-compatible serial interface, PWM input and Ambient Light Sensor (ALS).
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. Phase Shift PWM dimming offers further power saving especially when there is poor matching in the forward voltages of the LED strings. Boost voltage can also be controlled through the SMBus/I2C.
Internal EEPROM stores the data for backlight brightness and ambient light sensor calibration. Brightness can be calibrated during the backlight unit production so that all units produce the same brightness. EEPROM also stores the coefficients for the LED control equations and the default LED current value. LED current has 8–bit adjustment from 0 to 60 mA.