LP8545 Series
Six channel high-efficiency LED backlight driver for notebooks with flexible ext/int FET control
Manufacturer: Texas Instruments
Catalog(1 parts)
| Part | Dimming | Voltage - Supply (Max)▲▼ | Supplier Device Package | Package / Case | Type | Frequency▲▼ | Current - Output / Channel▲▼ | Voltage - Output▲▼ | Internal Switch(s)▲▼ | Mounting Type | Operating Temperature▲▼ | Operating Temperature▲▼ | Applications | Topology | Number of Outputs▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments LP8545SQX/NOPBLED Driver IC 6 Output DC DC Regulator Step-Up (Boost) PWM Dimming 50mA 24-WQFN (4x4) | PWM | 22 V | 24-WQFN (4x4) | 24-WFQFN Exposed Pad | DC DC Regulator | 156000 Hz, 312000 Hz, 625000 Hz, 1250000 Hz | 0.05000000074505806 A | 40 V | Surface Mount | -30 °C | 85 °C | Backlight | Step-Up (Boost) | 6 ul |
Key Features
• High-Voltage DC/DC Boost Converter with Integrated FETwith Four Switching Frequency Options: 156/312/625/1250 kHzConfigurable for Use with External FET for Applications NeedingHigher Output Voltage2.7V – 22V Input Voltage Range to Support 1x…5x CellLi-Ion BatteriesProgrammable PWM Resolution8 to 13 True Bit (Steady State)Additional 1 to 3 Bits Using Dithering During BrightnessChangesI2C and PWM Brightness ControlPWM Output Frequency and LED Current Set Through ResistorsOptional Synchronization to Display VSYNCSignal6 LED Outputs with LED fault (Short/Open) DetectionLow Input Voltage, Over-Temperature, Over-Current Detectionand ShutdownMinimum Number of External ComponentsWQFN 24-Pin Package, 4 × 4 × 0.8 mmHigh-Voltage DC/DC Boost Converter with Integrated FETwith Four Switching Frequency Options: 156/312/625/1250 kHzConfigurable for Use with External FET for Applications NeedingHigher Output Voltage2.7V – 22V Input Voltage Range to Support 1x…5x CellLi-Ion BatteriesProgrammable PWM Resolution8 to 13 True Bit (Steady State)Additional 1 to 3 Bits Using Dithering During BrightnessChangesI2C and PWM Brightness ControlPWM Output Frequency and LED Current Set Through ResistorsOptional Synchronization to Display VSYNCSignal6 LED Outputs with LED fault (Short/Open) DetectionLow Input Voltage, Over-Temperature, Over-Current Detectionand ShutdownMinimum Number of External ComponentsWQFN 24-Pin Package, 4 × 4 × 0.8 mm
Description
AI
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.
Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.
LP8545 has safety features which make it possible to detect LED outputs with open or short fault. As well low input voltage and boost over-current conditions are monitored and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
LP8545 is available in TI’s WQFN 24-pin package.
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.
Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.
LP8545 has safety features which make it possible to detect LED outputs with open or short fault. As well low input voltage and boost over-current conditions are monitored and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
LP8545 is available in TI’s WQFN 24-pin package.