Catalog(4 parts)
| Part | Operating Temperature▲▼ | Operating Temperature▲▼ | Number of Outputs▲▼ | Mounting Type | Dimming | Internal Switch(s)▲▼ | Voltage - Output▲▼ | Type | Frequency▲▼ | Current - Output / Channel▲▼ | Topology | Voltage - Supply (Max)▲▼ | Package / Case | Supplier Device Package | Applications | Voltage - Input▲▼ | Voltage - Input▲▼ | Supplied Contents | Utilized IC / Part | Outputs and Type | Outputs and Type▲▼ | Features |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments LP8557IAYFQRLED Driver IC 6 Output DC DC Regulator Step-Up (Boost) PWM Dimming 25mA 16-DSBGA | -30 °C | 85 °C | 6 ul | Surface Mount | PWM | 28 V | DC DC Regulator | 500000 Hz, 1000000 Hz | 0.02500000037252903 A | Step-Up (Boost) | 5.5 V | 16-WFBGA, DSBGA | 16-DSBGA | Backlight | ||||||||
Texas Instruments LP8557AYFQTLED Driver IC 6 Output DC DC Regulator Step-Up (Boost) PWM Dimming 25mA 16-DSBGA | -30 °C | 85 °C | 6 ul | Surface Mount | PWM | 28 V | DC DC Regulator | 500000 Hz, 1000000 Hz | 0.02500000037252903 A | Step-Up (Boost) | 5.5 V | 16-WFBGA, DSBGA | 16-DSBGA | Backlight | ||||||||
0.019999999552965164 A | 2.700000047683716 V | 5.5 V | Board(s) | LP8557I | Non-Isolated | 6 ul | Dimmable | |||||||||||||||
Texas Instruments LP8557IAYFQTLED Driver IC 6 Output DC DC Regulator Step-Up (Boost) PWM Dimming 25mA 16-DSBGA | -30 °C | 85 °C | 6 ul | Surface Mount | PWM | 28 V | DC DC Regulator | 500000 Hz, 1000000 Hz | 0.02500000037252903 A | Step-Up (Boost) | 5.5 V | 16-WFBGA, DSBGA | 16-DSBGA | Backlight |
Key Features
• High-Efficiency DC-DC Boost Converter With 28-V Integrated Power MOSFET2.7-V to 5.5-V VDD Range for Supporting Single-Cell Li-Ion Battery ApplicationsSix 25-mA High-Precision LED Current SinksAdaptive Boost Voltage and LED Current Sink Headroom Controls for Maximum System EfficiencyLED String Count Auto-Detect for Maximum Design FlexibilitySmart Phase Shift PWM Mode for Reduced Audible NoisePWM Input Duty Cycle Brightness Control, PWM Output Frequency Selectable Independent of Input FrequencyHybrid PWM Plus Current Dimming for Higher LED Drive Optical EfficiencySwitching Frequency, PWM Output Frequency, and LED Current can be set Through Resistors or I2C InterfaceProgrammable Boost SW Slew Rate Control and Spread Spectrum Scheme for Reduced Switching Noise and Improved EMI PerformanceUVLO, TSD, BST_OVP, BST_OCP, BST_UV, LED OPEN* and LED Short Fault CoverageMinimum Number of External ComponentsHigh-Efficiency DC-DC Boost Converter With 28-V Integrated Power MOSFET2.7-V to 5.5-V VDD Range for Supporting Single-Cell Li-Ion Battery ApplicationsSix 25-mA High-Precision LED Current SinksAdaptive Boost Voltage and LED Current Sink Headroom Controls for Maximum System EfficiencyLED String Count Auto-Detect for Maximum Design FlexibilitySmart Phase Shift PWM Mode for Reduced Audible NoisePWM Input Duty Cycle Brightness Control, PWM Output Frequency Selectable Independent of Input FrequencyHybrid PWM Plus Current Dimming for Higher LED Drive Optical EfficiencySwitching Frequency, PWM Output Frequency, and LED Current can be set Through Resistors or I2C InterfaceProgrammable Boost SW Slew Rate Control and Spread Spectrum Scheme for Reduced Switching Noise and Improved EMI PerformanceUVLO, TSD, BST_OVP, BST_OCP, BST_UV, LED OPEN* and LED Short Fault CoverageMinimum Number of External Components
Description
AI
The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.
The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.
The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.
The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.
Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.
Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.
The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.
The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.
The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.
The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.
Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.
Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.