MAX8758
Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD
Part Details
- 1.8V to 5.5V Input Voltage Range
- Input Undervoltage Lockout
- 0.5mA Quiescent Current
- 640kHz/1.2MHz Current-Mode Step-Up Regulator
- Fast Transient Response
- High-Accuracy Output Voltage (1.5%)
- Built-In 14V, 2.5A, 115mΩ MOSFET
- High Efficiency
- Programmable Soft-Start
- Current Limit with Lossless Sensing
- Timer-Delay Fault Latch
- High-Speed Operational Amplifier
- ±150mA Output Current
- 7.5V/µs Slew Rate
- 12MHz, -3dB Bandwidth
- Rail-to-Rail Inputs/Outputs
- Dual Mode, Logic-Controlled, High-Voltage Switch with Programmable Delay
- Thermal-Overload Protection
- 24-Pin, 4mm x 4mm, Thin QFN Package
The MAX8758 includes a high-performance step-up regulator, a high-speed operational amplifier, and a logic-controlled, high-voltage switch-control block with programmable delay. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC regulator provides the regulated supply voltage for the panel source driver ICs. The converter is a high-frequency (640kHz/1.2MHz), current-mode regulator with an integrated 14V n-channel power MOSFET. The high-switching frequency allows the use of ultra-small inductors and ceramic capacitors. The current-mode control architecture provides fast transient response to pulsed loads. The regulator achieves efficiencies over 85% by bootstrapping the supply rail of the internal gate driver from the step-up regulator output. The step-up regulator features undervoltage lockout (UVLO), soft-start, and internal current limit. The high-current operational amplifier is designed to drive the LCD backplane (VCOM). The amplifier features high output current (±150mA), fast slew rate (7.5V/µs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs.
The MAX8758 is available in a 24-pin, 4mm x 4mm, thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panels. The device operates over the -40°C to +85°C temperature range.
Applications
- LCD Monitors
- Notebook Displays
Documentation
Data Sheet 1
Reliability Data 1
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
Parts | Product Life Cycle | Description |
---|---|---|
Product 5 | ||
MAX1542 | TFT LCD DC-to-DC Converter with Operational Amplifiers | |
MAX1516A | TFT-LCD DC-DC Converters with Operational Amplifiers | |
MAX1543 | TFT LCD DC-to-DC Converter with Operational Amplifiers | |
MAX1517A | TFT-LCD DC-DC Converters with Operational Amplifiers |
MAX1518A | TFT-LCD DC-DC Converters with Operational Amplifiers |
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