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VOLTAGE REGULATOR. GSC2127 Datasheet

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VOLTAGE REGULATOR. GSC2127 Datasheet







GSC2127 REGULATOR. Datasheet pdf. Equivalent




GSC2127 REGULATOR. Datasheet pdf. Equivalent





Part

GSC2127

Description

CMOS POSITIVE VOLTAGE REGULATOR

Manufacture

GTM

Datasheet
Download GSC2127 Datasheet


GTM GSC2127

GSC2127; www.DataSheet4U.com ISSUED DATE :2006/02 /24 REVISED DATE : GSC2127 Description 7 5 0 m A C M O S P o s i t i v e Vo l t a g e R e g u l a t o r The GSC212 7 series of positive, linear regulators feature low quiescent current (45 A ty p.) with low dropout voltage, making th en ideal for battery applications. Outp ut voltages are set at the factory and trimmed to 1.5% ac.


GTM GSC2127

curacy. These rugged devices have both T hermal Shutdown, and Current Fold-back to prevent device failure under the “ Worst” of operating conditions. An ad ditional feature is a “Power Good” detector, which pulls low when the outp ut is out of regulation. The GSC2127 is stable with an output capacitance of 4 .7 F or greater. Features Application s Very Low Dropout Voltag.


GTM GSC2127

e Guaranteed 750mA output Over-Temperatu re Shutdown Current Limiting Short Circ uit Current Fold-back Low Temperature C oefficient Noise Reduction Bypass Capac itor Power-saving Shutdown Mode Power G ood Output Function Functional Block D iagram Package Dimensions Battery Pow ered Widgets Instrumentation Wireless D evices PC Peripherals Portable Electron ics REF. A B C D .



Part

GSC2127

Description

CMOS POSITIVE VOLTAGE REGULATOR

Manufacture

GTM

Datasheet
Download GSC2127 Datasheet




 GSC2127
www.DataSheet4U.com
ISSUED DATE :2006/02/24
REVISED DATE :
GSC2127
750m A CMO S Po si ti ve Vol tag e Regu l ato r
Description
The GSC2127 series of positive, linear regulators feature low quiescent current (45 A typ.) with low dropout
voltage, making then ideal for battery applications.
Output voltages are set at the factory and trimmed to 1.5% accuracy.
These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under
the “Worst” of operating conditions.
An additional feature is a “Power Good” detector, which pulls low when the output is out of regulation.
The GSC2127 is stable with an output capacitance of 4.7 F or greater.
Features
Very Low Dropout Voltage
Guaranteed 750mA output
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Low Temperature Coefficient
Noise Reduction Bypass Capacitor
Power-saving Shutdown Mode
Power Good Output Function
Applications
Battery Powered Widgets
Instrumentation
Wireless Devices
PC Peripherals
Portable Electronics
Package Dimensions
Functional Block Diagram
Typical Application Circuit
REF.
A
B
C
D
E
F
Millimeter
Min. Max.
5.80
6.20
4.80
5.00
3.80
4.00
0° 8°
0.40
0.90
0.19
0.25
REF.
M
H
L
J
K
G
Millimeter
Min. Max.
0.10
0.25
0.35
0.49
1.35
1.75
0.375 REF.
45°
1.27 TYP.
GSC2127
Page: 1/6





 GSC2127
ISSUED DATE :2006/02/24
REVISED DATE :
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Input Max Voltage
VIN 8
V
Output Current
IOUT
PD/( VIN- VO)
mA
Output Voltage
Operating Ambient Temperature
VOUT
Topr
1.5~3.3
-40 ~ +85
V
Junction Temperature
Tj -40 ~ +125
Maximum Junction Temperature
Internal Power Dissipation( T=100 )
Tj Max
PD
150
810
mW
EDS Classification
B
Electrical Characteristics TA=25 unless otherwise noted
(VIN=VOUT (T) +2V, VEN=VIN, CIN=1 F, COUT=4.7 F)
Parameter
Symbol
Condition
Output Voltage
VOUT(E)
(Note1)
IO=1mA, VIN=VOUT(T)+2V
Output Current
IO
VO>1.2V
Current Limit ILIM VO>1.2V
Short Circuit Current ISC VIN=VOUT(T)+1V, VO < 0.4V
Min TYP Max
-1.5
VOUT(T)
(Note2)
1.5
750 -
-
750 -
-
- 750 -
Unit
%
mA
mA
mA
Load Regulation
REGLOAD
VIN=VOUT(T)+2V, IO=1mA to 750mA
-1
0.2
1
%
Dropout Voltage
IO=750mA
VOUT(T)=1.5V
-
- 1000
VDROPOUT VO=VOUT(E)-2%
VOUT(T)=1.8V
-
- 650 mV
Quiescent Current
Ground Pin Current
IQ
IGND
VOUT(T) 2.0V
VIN=VOUT(T)+2V, IO=0mA
VIN=VOUT(T)+2V, IO=1mA to 750mA
-
-
-
- 500
45 70
45 -
A
A
Line Regulation
REGLINE
IO=1mA
VIN=VOUT(T)+1 to
VOUT(T)+2
VOUT(T)<2.0V
2.0V VOUT(T)<4.0V
4.0V VOUT(T)
-0.15
-0.1
-0.4
-
0.02
-
0.15
0.1
0.4
%
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Output Voltage
Temperature Coefficient
VIN
OTS
OTH
TC
Note3
-
-
-
-
150
30
30
7V
-
-
- ppm/
Power Supply Rejection
PSRR
Io=100mA
Co=4.7 F
(ceramic)
f=1kHz
f=10kHz
f=100kHz
- 75 -
- 55 -
- 30 -
dB
Output Voltage Noise
eN f=10Hz~100kHz, Io=10mA, Co=4.7 F - 30 - Vrms
EN Input Threshold
VEH
VEL
VIN=2.7V to 7V
VIN=2.7V to 7V
2.0 - VIN
V
0
- 0.4
V
EN Input Bias Current
IEH
IEL
VEN=VIN, VIN=2.7V to 7V
VEN= 0V, VIN=2.7V to 7V
- -1
- -1
A
A
Shutdown Supply Current
Output Under Voltage
Output Over Voltage
PG Leakage Current
PG Voltage Low
ISD
VUV
VOV
ILC
VOL
VIN=5V, VO=0V, VEN<VEL
PG goes Low when VOUT too Low
PG goes Low when VOUT too High
VPG=7V
ISINK=0.25mA
- 0.5
--
105 -
--
--
2A
84 % VOUT(T)
- % VOUT(T)
1.0 A
0.4 V
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT (T) + 2.0V” is provided at the VIN pin while maintaining a
certain IOUT value).
2: VOUT (T) =Specified Output Voltage
3: VIN (MIN) =VOUT+VDROPOUT
GSC2127
Page: 2/6





 GSC2127
ISSUED DATE :2006/02/24
REVISED DATE :
Ordering Information ( contd. )
Part Number
GSC2127-15
GSC2127-25
Marking
7B152
XXXX
7B252
XXXX
Output Voltage
1.5V
2.5V
Part Number
GSC2127-18
GSC2127-33
Marking
7B182
XXXX
7B332
XXXX
Output Voltage
1.8V
3.3V
Detailed Description
The GSC2127 series of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision
reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds
140 , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 .
The GSC2127 behaves like a current source when the load reaches 2.2A. However, if the load impedance
drops below 0.3ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal
operation is restored when the load resistance exceeds 0.75ohms.
External Capacitors
The GSC2127 is stable with an output capacitance to ground of 4.7 F or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the
highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are
comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic.
The benefit is low ESR, high capacitance, and low overall cost.
A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should
be at least 0.1 F to have a beneficial effect.
All capacitors should be placed in close proximity to the pins. A “Quiet” ground termination is desirable. This
can be achieved with a “Star” connection.
Enable
When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In
this state, the quiescent current is less than 2 A. This pin behaves much like an electronic switch.
100K resistor is necessary between VEN source and EN pin when VEN is high than VIN.
(Note: There is no internal pull-up for EN pin. It can not be floating.)
Power Good
The GSC2127 includes the Power Good feature. When the output is not within 15% of the specified voltage,
it pulls low. This can occur under the following conditions:
1) Input Voltage too low.
2) During Over-Temperature.
3) During Over-Current.
4) If output is pulled up.
(Note: PG pin is an open-drain output.)
GSC2127
Page: 3/6



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