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IC / 1997E / MAX1997ETJ / QFN-32

تولید کننده: MAXIM
مدل کالا: MAX1997ETJ
موجودی:
تماس 8893- 6186
قیمت: 0تومان

1997E - MAX1997ETJ – MAXIM-QFN-32

Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer
 

پنج برابر سه خروجی با حفاظت از گسل و بافر

 

General Description

The MAX1997/MAX1998 provide the voltages required for active-matrix, thin-film transistor liquid-crystal displays (TFT LCDs). Both combine a high-performance step-up regulator with two linear-regulator controllers, input protection switch control, and flexible sequence programming

The MAX1997 contains two additional linearregulator controllers and a VCOM buffer. The MAX1997/MAX1998 can operate from input supplies of 2.7V to 5.5V and feature multiple levels of protection circuitry, making them complete power-supply systems for displays

The main DC-DC converter provides the regulated supply voltage for the display’s source-driver ICs. The converter is a high-frequency (up to 1.5MHz) step-up regulator with an integrated 14V N-channel MOSFET that allows the use of ultra-small inductors and ceramic capacitors while achieving efficiencies over 85%. Its current-mode control architecture provides fast transient response to pulsed loads. Internal soft-start and  cycle-by-cycle current limit help prevent input surge currents

 

The positive and negative linear-regulator controllers postregulate charge-pump outputs for TFT gate-on and gate-off supplies. Both linear-regulator controllers, as well as the step-up regulator, have supply-sequencing control inputs. The three outputs can be sequenced in any order by selecting the appropriate external components

The MAX1997 features a high-current backplane driver (VCOM). This buffer provides peak currents exceeding 300mA (typ) and requires only a 0.47μF output filter capacitor. The MAX1997’s two additional linear-regulator

controllers can be used to build the gamma reference voltage and a logic supply. The MAX1997/MAX1998 have a unique input switch control that can replace the typical input supply fuse. When a fault is detected, the regulator is disconnected from the input supply. The fault detector monitors all the regulated output voltages and the current from the input supply. In addition, the MAX1997/MAX1998 enter shutdown when the internal over-temperature threshold is reached

The MAX1997 is available in a 32-pin thin QFN package and the MAX1998 is available in a 20-pin thin QFN package.Both packages have a maximum thickness of 0.8mm suitable for ultra-thin LCD panels

 

Applications

Notebook Computer Displays

LCD Monitors

Car Navigation Displays

 

Features

 2.7V to 5.5V Input Supply Range

 Adjustable (Up to +13V) Output Voltage for Source-Driver ICs

 Integrated High-Efficiency Power MOSFET

 Linear-Regulator Controllers for TFT Gate-On and Gate-Off Supplies

 High-Current VCOM Buffer /MAX1997 Only

Two Additional Linear-Regulator Controllers /MAX1997 Only

 Programmable Power-Up Sequencing

Multiple Overload Protection with Thermal Shutdown

1μA Shutdown Current

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