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参数资料
| 型号： | MAX1997ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/31页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY TFT LCD 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 5 |
| 输出电压： | 2.7 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
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Quintuple/Triple-Output TFT LCD Power Supplies
with Fault Protection and VCOM Buffer
V MAIN
V P
V N
DRVP
NPN CASCODE
TRANSISTOR
PNP PASS
TRANSISTOR
DRVN
PNP CASCODE
TRANSISTOR
NPN PASS
TRANSISTOR
V G_ON
FBP
Figure 4. Using Cascode NPN for Output Voltages > 28V
Positive Linear-Regulator
Controller, REG P
The positive linear-regulator controller is an analog gain
block with an open-drain N-channel output. It drives an
external PNP pass transistor with a 6.8k ? base-to-emitter
resistor (Figure 1). Its guaranteed base drive sink current
is at least 2mA. The regulator is designed to deliver 20mA
with an output capacitor of 1μF.
REG P is enabled when SHDN is high, the gate to the
input P-channel MOSFET is low, ONDC is high, V CT >
V ONP , and the soft-start of the main step-up regulator is
complete. (See the Power-Up Sequencing and Inrush
Current Control section.) Each time it is enabled, the
regulator goes through a soft-start routine that ramps
up its reference input.
Note that the voltage rating of the DRVP output is 28V. If
higher voltages are present, an external cascode NPN
transistor should be used with the emitter connected to
DRVP, the base to V MAIN , and the collector to the base
of the PNP (Figure 4).
REG P is typically used to provide the TFT LCD gate
driver ’ s gate-on voltage. A sufficient voltage can be
produced using a charge-pump circuit as shown in
Figure 1. Use as many stages as necessary to obtain
the required output voltage. (See the Selecting the
Number of Charge-Pump Stages section.)
Negative Linear-Regulator
Controller, REG N
The negative linear-regulator controller is an analog
gain block with an open-drain P-channel output. It dri-
ves an external NPN pass transistor with a 6.8k ?
base-to-emitter resistor (Figure 1). Its guaranteed base
drive source current is at least 2mA. The regulator is
designed to deliver 20mA with an output capacitor of
0.47μF.
V G_OFF
FBN
REF
Figure 5. Using Cascode PNP for Output Voltages < VIN - 28V
REG N is enabled when SHDN is high, the gate to the
input P-channel MOSFET is low, ONDC is high, and
V CT > V ONN (see the Power-Up Sequencing and Inrush
Current Control section). Each time it is enabled, the
regulator goes through a soft-start routine that ramps
down its reference input.
Note that the voltage rating of the DRVN output is
V IN - 28V. If lower voltages are present, an external
cascode PNP transistor should be used with the emitter
connected to DRVN, the base to GND, and the collec-
tor to the base of the NPN (Figure 5).
REG N is typically used to provide the TFT LCD gate
driver ’ s gate-off voltage. A negative voltage can be pro-
duced using a charge-pump circuit as shown in Figure
1. Use as many stages as necessary to obtain the
required output voltage. (See the Selecting the Number
of Charge-Pump Stages section.)
Linear-Regulator Controller, REG 1
(MAX1997 Only)
The linear-regulator controller REG 1 is an analog gain
block with an open-drain N-channel output. It drives an
external PNP pass transistor with a 510 ? base-to-emitter
resistor (Figure 1). Its guaranteed base-drive sink current
is at least 5mA. The regulator is designed to deliver
300mA with an output capacitor of 10μF.
REG 1 is enabled when SHDN is high and the gate to
the input P-channel MOSFET is low. (See the Power-Up
Sequencing and Inrush Current Control section.) Each
time it is enabled, the regulator goes through a soft-
start routine that ramps up its reference input. REG 1 is
typically used to provide the TFT LCD timing
controller ’ s logic supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1997ETJ+ | 功能描述:其他电源管理 Quint/Triple-Out TFT LCD Power Supply RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX1997ETJ+T | 功能描述:LCD 驱动器 Quint/Triple-Out TFT LCD Power Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1997ETJ-T | 功能描述:其他电源管理 RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX1997EVKIT | 制造商:Maxim Integrated Products 功能描述:QUINTUPLE/TRIPLE OUTPUT TFT LCD POWER SUPPLIE - Bulk |
| MAX19983A | 功能描述:上下转换器 RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
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