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PDF G9611 Data sheet ( Hoja de datos )
| Número de pieza | G9611 | |
| Descripción | Linear Regulator | |
| Fabricantes | GMT | |
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Global Mixed-mode Technology Inc.
G9611
Low-Dropout, 300mA Linear Regulator with Reset
Features
300mA Output Current, with Foldback Current
Limiting
High Ripple Rejection
±2% Output Accuracy
±2% Reset Threshold Accuracy
Externally Programmable Reset Time Delay
Generator
Internal 300mA P-Channel Pass Transistor
320µA quiescent Current
Thermal Overload Protection
SOP 8 Package
Applications
CD ROM or DVD ROM
Slim-Type CD/DVD
DVD Player
General Description
The G9611 are low-dropout, linear regulator with
reset function supply 3.4V, 3.3V or 2.5V output for
currents up to 300mA. They are available in a
700mW SOP 8 package. Typical dropouts are
320mV at 300mA. Shutdown turns off linear regu-
lator function. Other features include foldback cur-
rent limiting and thermal overload protection.
The reset function in G9611 detect VCC level with
hysteresis, keeping it asserted for time delay de-
termined by external capacitor. The reset output is
active low open-drain output. The detection thresh-
old are 3.9V or 4.2V.
The output is preset at 3.4V for the G9611A, 3.3V
for the G9611B/C, and 2.5V for G9611D. The reset
threshold is preset at 4.2V for G9611 A/B/D and
3.9V for G9611C.
Ordering Information
PART
NUMBER
MARKING
REGULATOR
OUTPUT VOLTAGE
G9611AP1x
G9611A
3.4
G9611BP1x
G9611B
3.3
G9611CP1x
G9611C
3.3
G9611DP1x
G9611D
2.5
Note: X Specify the packing type
U: Tape & Reel
T: Tube
RESET THRESHOLD
VOLTAGE
4.2
4.2
3.9
4.2
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
SOP-8L
SOP-8L
SOP-8L
SOP-8L
Pin configuration
Typical Operation Circuit
N.C 1
RESET 2
SHDN 3
VIN 4
G9611
8 CD
7 GND
6 N.C
SOP- 8L
5 VOUT
VCC
VIN
1µF RESET
G9611
SHDN
CD VOUT
GND
Rpull-high
10kΩ
OUTPUT
VOLTAGE
10µF
(Tantalum or Aluminum)
Ver: 1.4
Jun 29, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 page  
Global Mixed-mode Technology Inc.
Pin Description
G9611
PIN NO.
1, 6
2
3
4
5
7
8
PIN NAME
N.C
RESET
SHDN
VIN
VOUT
GND
CD
PIN FUNCTION
No Connection.
RESET Open-Drain Output remains low while VIN is below the reset threshold,
and for delay time set by CD after VIN rises above the reset threshold.
SHDN = High to enable regulator output.
SHDN = Low to shutdown regulator output.
Regulator Input. Supply voltage can range from 2.5V to 6V.
Regulator Output. Sources up to 300mA.
Ground
External Programmable time delay is set by the capacitor connect to CD pin.
SHDN
SHUTDOWN
LOGIC
－
＋
THERMAL
PROTECTION
1.24V
REFERENCE
VIN
MOSFET DRIVER
WITH FOLDBACK
CURRENT LIMIT
GND
P
VOUT
R1
R2
－
＋
RESET
RD
CD
Figure 1. Functional Diagram
Detailed Description
The G9611 are low-dropout, low-quiescent current
linear regulators with reset function The regulator in
G9611 supply 3.4V, 3.3V or 2.5V output for load cur-
rents up to 300mA. The reset function detect VIN. 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, thermal sensor, and shutdown logic.
The G9611 also offer reset function to detect the level
of VIN. They assert a reset signal whenever VIN supply
voltage declines below a preset threshold (VTH), keep-
ing it asserted for time delay set by capacitor con-
nected to CD pin, after VIN has resen above the high
reset threshold (VTH + VHYS). The RESET is an active
low, open-drain output.
Internal P-Channel Pass Transistor
The G9611 feature a 300mA 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 G9611 do not suffer from these
problems and consume only 320µA of quiescent cur-
rent.
Ver: 1.4
Jun 29, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet G9611.PDF ] | |
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