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參數(shù)資料
| 型號(hào)： | G914X |
| 英文描述： | 5-pin. 150mA. Vo=Fixed(1.5/1.8/2.5/2.7/2.8/2.85/3.0/3.3V). Low noise.|LDO regulator |
| 中文描述： | 5針。 150mA的。武\u003d固定（1.5/1.8/2.5/2.7/2.8/2.85/3.0/3.3V）。低噪音。| LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 280K |
| 代理商： | G914X |
Pin Description
Ver: 1.1
Sep 18, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G914X
Global Mixed-mode Technology Inc.
PIN
1
NAME
IN
FUNCTION
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1μF to GND.
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground
plane to maximize thermal dissipation.
Active-High Enable Input. A logic low reduces the supply current to less than 1μA. Connect to IN for
normal operation.
This is a reference bypass pin. It should connect external 10nF capacitor to GND to reduce out-
put noise. Bypass capacitor must be no less than 1nF. (C
BYP
≥
1nF)
Regulator Output. Sources up to 150mA. Bypass with a 1μF,
＜
0.2
typical ESR capacitor to
GND.
2
GND
3
SHDN
4
BYP
5
OUT
Detailed Description
The block diagram of the G914X is shown in Figure 1.
It consists of an error amplifier, 1.25V bandgap refer-
ence, PMOS output transistor, internal feedback volt-
age divider, shutdown logic, over current protection
circuit, and over temperature protection circuit.
The internal feedback voltage divider’s central tap is
connected to the non-inverting input of the error ampli-
fier. The error amplifier compares non-inverting input
with the 1.25V bandgap reference. If the feedback
voltage is higher than 1.25V, the error amplifier’s out-
put becomes higher so that the PMOS output transis-
tor has a smaller gate-to-source voltage (V
GS
). This
reduces the current carrying capability of the PMOS
output transistor, as a result the output voltage de-
creases until the feedback voltage is equal to 1.25V.
Similarly, when the feedback voltage is less than
1.25V, the error amplifier causes the output PMOS to
conduct more current to pull the feedback voltage up
to 1.25V. Thus, through this feedback action, the error
amplifier, output PMOS, and the voltage divider effec-
tively form a unity-gain amplifier with the feedback
voltage force to be the same as the 1.25V bandgap
reference. The output voltage, V
OUT
, is then given by
the following equation:
V
OUT
= 1.25 (1 + R1/R2).
Alternatively, the relationship between R1 and R2 is
given by:
R1 = R2 (V
OUT
/ 1.25 + 1).
For the output voltage versions of G914X, the output
voltages are 2.7V for G914A, 2.8V for G914B, 3.0V for
G914C, 3.3V for G914D, and 2.5V for G914E, 2.85V
for G914F, 1.50V for G914G and 1.80V for G914H.
(1)
(2)
Figure 1. Functional Diagram
SHDN
IN
OUT
LOGIC
Vref
－
＋
FEEDBACK
GND
R1
R2
PROTECT
BYP
C
BYP
SHUTDOWN
1.25V
ERROR
AMP
OVER CURRENT
PROTECT & DYNAMIC
OVER TEMP.
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| G914X_07 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:300mA High PSRR, Low-Noise LDO Regulators |
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