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参数资料
| 型号： | MAX1747EUP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC CHRG-PUMP TRPL TFTLCD 20TSSOP |
| 标准包装： | 74 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 4.5 V |
| 输出数： | 3 |
| 输出电压： | 可调 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
Triple Charge-Pump TFT LCD
DC-DC Converter
Pin Description
PIN
1, 2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NAME
TGND
RDY
FB
INTG
IN
GND
REF
FBP
FBN
SHDN
DRVN
SUPN
DRVP
SUPP
PGND
CXN
SUPM
CXP
OUT
FUNCTION
Must be connected to ground.
Active-Low Open-Drain Output. Indicates all outputs are ready. The R ON is 125 ? (typ).
Main Charge-Pump Feedback Input. Regulates to 1.25V nominal. Connect to the center of a
feedback resistive divider between the main output (OUT) and analog ground (GND).
Main Charge-Pump Integrator Output. If used, connect 1500pF to analog ground (GND). To disable
the integrator, connect to GND.
Supply Input. +2.7V to +4.5V input range. Powers only the logic and reference. Bypass to analog
ground (GND) with a 0.1 μ F capacitor as close to the pin as possible.
Analog Ground. Connect to power ground (PGND) underneath the IC.
Internal Reference Bypass Terminal. Connect a 0.22 μ F capacitor from this terminal to analog
ground (GND). External load capability to 50 μ A. REF is disabled in shutdown.
Positive Charge-Pump Feedback Input. Regulates to 1.25V nominal. Connect feedback resistive
divider to analog ground (GND).
Negative Charge-Pump Regulator Feedback Input. Regulates to 0V nominal. Connect feedback
resistive divider to the reference (REF).
Shutdown Input. Drive SHDN through an external resistor. When SHDN is pulled low, the device
turns off and draws only 0.1 μ A. OUT is also pulled low through an internal 10 ? resistor in shutdown
mode. When current is sourced into SHDN through R FREQ , the device activates, and the SHDN
input current sets the oscillator ’ s switching frequency:
R FREQ (k ? ) = 45.5 (MHz / mA) ? (V ON - 0.7V) / f OSC (MHz)
Negative Charge-Pump Driver Output. Output high level is V SUPN , and low level is PGND.
Negative Charge-Pump Driver Supply Voltage. Bypass to power ground (PGND) with a 0.1 μ F
capacitor.
Positive Charge-Pump Driver Output. Output high level is V SUPP and low level is PGND.
Positive Charge-Pump Driver Supply Voltage. Bypass to power ground (PGND) with a 0.1 μ F
capacitor.
Power Ground. Connect to analog ground (GND) underneath the IC.
Negative Terminal of the Main Charge-Pump Flying Capacitor
Main Charge-Pump Supply Voltage Input
Positive Terminal of the Main Charge-Pump Flying Capacitor
Main Charge-Pump Output. Bypass to power ground (PGND) with 10 μ F for a 1MHz application
(see Output Capacitor Selection ). An internal 10 ? resistor discharges the output when the device
is shut down.
Detailed Description
The MAX1747 is an efficient triple-output power supply
for TFT LCD applications. The device contains one
high-power charge pump and two low-power charge
pumps. The MAX1747 charge pumps switch continu-
ously at a constant frequency, so the output noise con-
tains well-defined frequency components, and the
circuit requires much smaller external capacitors for a
given output ripple. The adjustable switching frequency
is set by the current into the shutdown pin (see
Frequency Selection and Shutdown ).
The main charge pump uses internal MOSFETs with
low R ON to provide high output current. The adjustable
output voltage of the main charge pump can be set up
to 5.5V with external resistors. The dual low-power
charge pumps independently regulate a positive output
8
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相关代理商/技术参数 |
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|---|---|
| MAX1747EUP+ | 功能描述:电荷泵 Triple Charge-Pump TFT LCD DC/DC Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1747EUP+T | 功能描述:电荷泵 Triple Charge-Pump TFT LCD DC/DC Conv RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1747EUP-T | 功能描述:电荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1747EVKIT | 功能描述:电源管理IC开发工具 MAX1747 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17480EVKIT+ | 功能描述:电源管理IC开发工具 MAX17480 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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