Internal-Switch Boost Regulator with Integrated 7-Channel Driver, VCOM Calibrator, Op Amp, and LDO
Single-Chip Power IC with Integrated Level Shifters and Programmable VCOM for Notebook LCD Applications
DescriptionThe MAX17094 includes a high-performance step-up regulator, a 250mA low-dropout (LDO) linear regulator, a high-speed operational amplifier, a digitally adjustable VCOM calibration device with nonvolatile memory and I²C interface, and seven integrated high-voltage level shifters. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC converter is a current-mode regulator that provides the regulated supply voltage for panel source driver ICs. The current-mode architecture provides fast-transient responses to pulsed loads typical of source driver loads. The high switching frequency, which is programmable to any frequency between 450kHz to 1.2MHz with a single resistor, allows the use of ultra-small inductors and ceramic capacitors. The step-up regulator’s soft-start time is controlled by an internal 10ms digital timer that requires no external components; or if desired, the soft-start time can be adjusted by adding a single external capacitor.
The low-voltage LDO linear regulator can provide at least 250mA. The output voltage is accurate within ±2%.
The high-voltage, level-shifting scan driver is designed to work with panels that incorporate row drivers on the panel glass. Its seven outputs swing from +30V to -10V and can swiftly drive capacitive loads.
The high-performance op amp is designed to drive the LCD backplane and features 20MHz bandwidth, 45V/µs slew rate, and 150mA output currents.
The programmable VCOM calibrator is externally attached to the VCOM amplifier’s resistive voltage-divider and sinks a programmable current to adjust the VCOM voltage level. An internal 7-bit digital-to-analog converter (DAC) controls the sink current. The DAC is ratiometric relative to AVDD and is guaranteed monotonic over all operating conditions. The calibrator includes a nonvolatile memory device (IVR) to store the desired VCOM voltage level. The 2-wire I²C interface simplifies production equipment.
The MAX17094 is available in a 48-pin, 6mm x 6mm TQFN package with a maximum thickness of 0.8mm for thin LCD panels.
- 1.8V to 5.5V IN Supply Voltage Range
- 450kHz to 1.2MHz Adjustable Frequency Current-Mode Step-Up Regulator
- Fast-Transient Response
- Integrated 14V, 2.5A, 150mΩ MOSFET
- High Efficiency (> 85%)
- Low-Dropout Linear Regulator
- High-Accuracy Output Voltage (2.0%)
- Internal Digital Soft-Start
- High-Performance Operational Amplifier
- 200mA Output Short-Circuit Current
- 45V/µs Slew Rate
- 20MHz, -3dB Bandwidth
- Rail-to-Rail Inputs and Outputs
- High-Voltage Drivers
- +30V to -10V Outputs
- I²C Programmable VCOM Calibrator
- 7-Bit Adjustable Current-Sink Output
- Nonvolatile IVR Memory
- Thermal-Overload Protection
- Notebook Computer Displays
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
- High Integration
- Low EMI
- I2C Control/Diagnostic Interface with FLTB (Interrupt) Output