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| 型号： | G9131-15T74U |
| 厂商： | Global Mixed-mode Technology Inc. |
| 英文描述： | 300mA Low-Dropout Linear Regulators |
| 中文描述： | 300mA的低压差线性稳压器 |
| 文件页数： | 8/10页 |
| 文件大小： | 271K |
| 代理商： | G9131-15T74U |
Ver: 1.6
Dec 22, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G9131
Global Mixed-mode Technology Inc.
Pin Description
NAME
FUNCTION
IN
Regulator Input. Supply voltage can range from VIN(min) to +5.5V. Bypass with 1F to GND.
GND
This is ground pin.
OUT
Regulator Output. Sources up to 300mA. Bypass with a 1F, ＜0.2
Ω typical ESR capacitor to GND.
Detailed Description
The block diagram of the G9131 is shown in Figure 1.
It consists of an error amplifier, 1.25V bandgap refer-
ence, PMOS output transistor, internal feedback volt-
age divider, over current protection circuit, and over
temperature protection circuit.
Over Current Protection
The G9131 use a current sense-resistor to monitor the
output current. A portion of the PMOS output transistor’s
current is mirrored to a resistor such that the voltage
across this resistor is proportional to the output current.
Once the output current exceeds limit threshold, G9131
would be protected with a limited output current. Further
more, when the output is short to ground, the output
current would be folded-back to a less limit.
Over Temperature Protection
To prevent abnormal temperature from occurring, the
G9131 has a built-in temperature monitoring circuit.
When it detects the temperature is above 150°C, the
output transistor is turned off. When the IC is cooled
down to below 135°C, the output is turned on again. In
this way, the G9131 will be protected against abnor-
mal junction temperature during operation.
Operating Region and Power Dissipation
Since the G9131 is a linear regulator, its power dissi-
pation is always given by P = IOUT (VIN - VOUT). The
maximum power dissipation is given by: PD(MAX) = (TJ -
TA)/θJA, Where (TJ - TA) is the temperature difference
the G9131 die and the ambient air. For surface mount
device, heat sinking is accomplished by using the heat
spreading capabilities of the PC board and its copper
traces. θJA is the thermal resistance of the chosen
package to the ambient air. In the case of a SOT-23
package, the thermal resistance is typically 275.5°C/W.
In SOT 89 RθJA is 172.5°C/W.
相关PDF资料 |
PDF描述 |
|---|---|
| G9131-15T75U | 300mA Low-Dropout Linear Regulators |
| G9131-15T76U | 300mA Low-Dropout Linear Regulators |
| G9131-18T21U | 300mA Low-Dropout Linear Regulators |
| G9131-18T22U | 300mA Low-Dropout Linear Regulators |
| G9131-18T23U | 300mA Low-Dropout Linear Regulators |
相关代理商/技术参数 |
参数描述 |
|---|---|
| G9131-15T75U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:300mA Low-Dropout Linear Regulators |
| G9131-15T76U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:300mA Low-Dropout Linear Regulators |
| G9131-18T21U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:300mA Low-Dropout Linear Regulators |
| G9131-18T22U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:300mA Low-Dropout Linear Regulators |
| G9131-18T23U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:300mA Low-Dropout Linear Regulators |
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