Datasheet > MAX1997

MAX1997

更新时间： 2023-12-20 18:46:06

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
31页	760K
描述
五/三输出TFT LCD电源，带有故障保护及VCOM缓冲器

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MAX1997 数据手册

19-2638; Rev 0; 10/02

Quintuple/Triple-Output TFT LCD Power Supplies

with Fault Protection and VCOM Buffer

General Description

Features

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 pro-

tection switch control, and flexible sequence program-

ming. The MAX1997 contains two additional linear-

regulator 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.

o 2.7V to 5.5V Input Supply Range

o Adjustable (Up to +13V) Output Voltage for

Source-Driver ICs

o Integrated High-Efficiency Power MOSFET

o Linear-Regulator Controllers for TFT Gate-On and

Gate-Off Supplies

o High-Current VCOM Buffer (MAX1997 Only)

o Two Additional Linear-Regulator Controllers

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.

(MAX1997 Only)

o Programmable Power-Up Sequencing

o Multiple Overload Protection with Thermal

Shutdown

o 1µA Shutdown Current

o 32-Pin/20-Pin Thin QFN Packages

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.

Ordering Information

TEMP RANGE PIN-PACKAGE

PART

MAX1997ETJ

MAX1998ETP

-40°C to +85°C 32 Thin QFN 5mm x 5mm

-40°C to +85°C 20 Thin QFN 5mm x 5mm

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.

Pin Configurations

The MAX1997/MAX1998 have a unique input switch con-

trol 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.

TOP VIEW

TGNDA

PGND

ONN

ONP

ON2

The MAX1997 is available in a 32-pin thin QFN package

and the MAX1998 is available in a 20-pin thin QFN pack-

age. Both packages have a maximum thickness of

0.8mm suitable for ultra-thin LCD panels.

DRVP

MAX1998

12 FBP

Applications

Notebook Computer Displays

LCD Monitors

THIN QFN 5mm × 5mm

Car Navigation Displays

Pin Configurations continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...31

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与MAX1997相关器件

型号	品牌	获取价格	描述	数据表
MAX1997ETJ	MAXIM	获取价格	SMPS Controller
MAX1997ETJ+	MAXIM	获取价格	Switching Regulator, Current-mode, 2.8A, 863kHz Switching Freq-Max, CMOS, CQCC32, 5 X 5 MM
MAX1997ETJ+T	MAXIM	获取价格	Switching Regulator, Current-mode, 2.8A, 863kHz Switching Freq-Max, CMOS, CQCC32, 5 X 5 MM
MAX1997ETJ-T	MAXIM	获取价格	Switching Regulator, Current-mode, 2.8A, 863kHz Switching Freq-Max, CMOS, CQCC32, 5 X 5 MM
MAX1997EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX1997
MAX1998	MAXIM	获取价格	Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer
MAX19985A	MAXIM	获取价格	Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch
MAX19985A	ADI	获取价格	双通道、SiGe、高线性度、高增益、700MHz至1000MHz下变频混频器，带有LO缓冲
MAX19985AETX+	MAXIM	获取价格	Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch
MAX19985AETX+T	MAXIM	获取价格	Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch

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