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參數(shù)資料
| 型號： | G9612 |
| 英文描述： | LDO with reset. Io=500mA.|LDO regulator |
| 中文描述： | 穩(wěn)壓器的復位。木衛(wèi)一\u003d 500mA的。| LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 451K |
| 代理商： | G9612 |
Ver: 1.2
Feb 13, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G9612
Global Mixed-mode Technology Inc.
Pin Description
PIN NO.
1
2
3
4
5
PIN NAME
V
IN
GND
V
OUT
C
D
RESET
PIN FUNCTION
Regulator Input. Supply voltage can range from 2.5V to 6V.
Ground
Regulator Output. Sources up to 500mA.
External Programmable time delay is set by the capacitor connect to C
D
pin.
RESET
Open-Drain Output remains low while V
IN
is below the reset threshold,
and for delay time set by C
D
after V
IN
rises above the reset threshold.
Figure 1. Functional Diagram
Detailed Description
The G9612 are low-dropout, low-quiescent current
linear regulators with reset function The regulator in
G9612 supply 3.4V, 3.3V or 2.5V output for load cur-
rents up to 500mA. The reset function detect V
IN.
As
illustrated in Figure 1, they consist of a 1.24V refer-
ence, error amplifier, MOSFET driver, P-channel pass
transistor, and internal feedback voltage divider, reset
threshold comparator and time delay generator.
The 1.24V bandgap reference is connected to the er-
ror amplifier’s inverting input. The error amplifier com-
pares this reference with the feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the
P-channel pass transistor. If the feedback voltage is
lower than the reference, the pass transistor gate is
pulled lower, allowing more current to pass and in-
creasing the output voltage. If the feedback voltage is
too high, the pass transistor gate is pulled up, allowing
less current to pass to the output.
Additional blocks of linear regulator include a foldback
current limiter, reverse current protection, and thermal
sensor.
The G9612 also offer reset function to detect the level
of V
IN
. They assert a reset signal whenever V
IN
supply
voltage declines below a preset threshold (V
TH
), keep-
ing it asserted for time delay set by capacitor con-
nected to C
D
pin, after V
IN
has resen above the high
reset threshold (V
TH
+ V
HYS
). The
RESET
is an active
low, open-drain output.
Internal P-Channel Pass Transistor
The G9612 feature a 500mA P-channel MOSFET
pass transistor. This provides several advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires
no base drive, which reduces quiescent current con-
siderably. PNP based regulators waste considerable
amounts of current in dropout when the pass transistor
saturates. They also use high base-drive currents un-
der large loads. The G9612 do not suffer from these
problems and consume only 320μA of quiescent cur-
rent.
V
OUT
1.24V
REFERENCE
－
＋
CURRENT LIMIT
R1
R2
PROTECTION
P
－
＋
C
D
R
D
V
IN
GND
RESET
MOSFET DRIVER
WITH FOLDBACK
THERMAL
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