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| 型号： | G9131-18T75U |
| 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： | 9/10页 |
| 文件大小： | 271K |
| 代理商： | G9131-18T75U |
Ver: 1.6
Dec 22, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G9131
Global Mixed-mode Technology Inc.
Applications Information
Capacitor Selection and Regulator Stability
Normally, use a 1F capacitor on the input and a 1F
capacitor on the output of the G9131. Larger input ca-
pacitor values and lower ESR provide better sup-
ply-noise rejection and transient response. For stable
operation over the full temperature range, with load
currents up to 120mA, a minimum of 1F is recom-
mended.
Power-Supply
Rejection
and
Operation
from
Sources Other than Batteries
The G9131 is designed to deliver low dropout voltages
and low quiescent currents in battery powered sys-
tems. Power-supply rejection is 47dB at low frequen-
cies the output capacitor is the major contributor to the
rejection of power-supply noise.
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output ca-
pacitors, and using passive filtering techniques.
Load Transient Considerations
The G9131 load-transient response graphs show two
components of the output response: a DC shift of the
output voltage due to the different load currents, and
the transient response. Typical overshoot for step
changes in the load current from 0mA to 300mA is
10mV. Increasing the output capacitor's value and
decreasing its ESR attenuates transient spikes.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable
supply voltage. In battery-powered systems, this will
determine the useful end-of-life battery voltage. Be-
cause the G9131 use a P-channel MOSFET pass
transistor, their dropout voltage is a function of RDS(ON)
multiplied by the load current.
Figure 1. Functional Diagram
IN
OUT
1.25V
Vref
－
ERROR
AMP
＋
OVER CURRENT
PROTECT & DYNAMIC
FEEDBACK
GND
R1
R2
OVER TEMP.
PROTECT
P
IN
OUT
1.25V
Vref
－
ERROR
AMP
＋
OVER CURRENT
PROTECT & DYNAMIC
FEEDBACK
GND
R1
R2
OVER TEMP.
PROTECT
P
相关PDF资料 |
PDF描述 |
|---|---|
| G9131-18T76U | 300mA Low-Dropout Linear Regulators |
| G9131-21 | InGaAs PIN photodiode with preamp |
| G9131-22 | InGaAs PIN photodiode with preamp |
| G9131-23 | InGaAs PIN photodiode with preamp |
| G9131-24 | InGaAs PIN photodiode with preamp |
相关代理商/技术参数 |
参数描述 |
|---|---|
| G9131-18T76U | 制造商:GMT 制造商全称:Global Mixed-mode Technology Inc 功能描述:300mA Low-Dropout Linear Regulators |
| G9131-21 | 制造商:HAMAMATSU 制造商全称:Hamamatsu Corporation 功能描述:InGaAs PIN photodiode with preamp |
| G9131-22 | 制造商:HAMAMATSU 制造商全称:Hamamatsu Corporation 功能描述:InGaAs PIN photodiode with preamp |
| G9131-23 | 制造商:HAMAMATSU 制造商全称:Hamamatsu Corporation 功能描述:InGaAs PIN photodiode with preamp |
| G9131-24 | 制造商:HAMAMATSU 制造商全称:Hamamatsu Corporation 功能描述:InGaAs PIN photodiode with preamp |
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