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VOLTAGE REGULATOR. GSC2138 Datasheet

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VOLTAGE REGULATOR. GSC2138 Datasheet






GSC2138 REGULATOR. Datasheet pdf. Equivalent




GSC2138 REGULATOR. Datasheet pdf. Equivalent





Part

GSC2138

Description

CMOS LOW DROPOUT VOLTAGE REGULATOR



Feature


www.DataSheet4U.com ISSUED DATE :2006/04 /13 REVISED DATE : GSC2138 Description 1 . 5 A C M O S L o w D r o p o u t V o l t a g e R e g u l a t o r The GSC2 138 of positive, linear regulator featu re low ground current (45 A typ.) with low dropout voltage, making them ideal for battery applications. Output voltag es are set at the factory and trimmed t o 1.5% accuracy. T.
Manufacture

GTM

Datasheet
Download GSC2138 Datasheet


GTM GSC2138

GSC2138; hese rugged devices have both Thermal Sh utdown, and Current Fold-back to preven t device failure under the “Worst” of operating conditions. The GSC2138 is stable with an output capacitance of 4 .7 F or greater. Features Application s Very Low Dropout Voltage Guaranteed 1.5A output Over-Temperature Shutdown C urrent Limiting Short Circuit Current F old-back Highly Accura.


GTM GSC2138

te± 1.5% Low Temperature Coefficient Po wer-Saving Shutdown Mode Adjustable Ver sion Functional Block Diagram Package Dimensions Battery Powered Widgets In strumentation Wireless Devices PC Perip herals Portable Electronics REF. A B C D E F Millimeter Min. Max. 5.80 4.80 3.80 0° 0.40 0.19 6.20 5.00 4.00 8° 0 .90 0.25 REF. M H L J K G Millimeter Min. Max. 0.10 0.25 0.


GTM GSC2138

.35 0.49 1.35 1.75 0.375 REF. 45° 1.27 TYP. Typical Application Circuit GSC2 138 Page: 1/7 ISSUED DATE :2006/04/13 REVISED DATE : Absolute Maximum Ratin gs Parameter Input Max Voltage Output C urrent Output Voltage Operating Ambient Temperature Junction Temperature Maxim um Junction Temperature Internal Power Dissipation( EDS Classification T=100 ) Symbol VIN IOUT V.

Part

GSC2138

Description

CMOS LOW DROPOUT VOLTAGE REGULATOR



Feature


www.DataSheet4U.com ISSUED DATE :2006/04 /13 REVISED DATE : GSC2138 Description 1 . 5 A C M O S L o w D r o p o u t V o l t a g e R e g u l a t o r The GSC2 138 of positive, linear regulator featu re low ground current (45 A typ.) with low dropout voltage, making them ideal for battery applications. Output voltag es are set at the factory and trimmed t o 1.5% accuracy. T.
Manufacture

GTM

Datasheet
Download GSC2138 Datasheet




 GSC2138
www.DataSheet4U.com
ISSUED DATE :2006/04/13
REVISED DATE :
GSC2138
1. 5A CMO S Low Dropou t Vol tag e Regu lato r
Description
The GSC2138 of positive, linear regulator feature low ground current (45 A typ.) with low dropout voltage,
making them 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.
The GSC2138 is stable with an output capacitance of 4.7 F or greater.
Features
Very Low Dropout Voltage
Guaranteed 1.5A output
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Highly Accurate± 1.5%
Low Temperature Coefficient
Power-Saving Shutdown Mode
Adjustable Version
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.
GSC2138
Page: 1/7




 GSC2138
ISSUED DATE :2006/04/13
REVISED DATE :
Absolute Maximum Ratings
Parameter
Input Max Voltage
Symbol
VIN
Ratings
8
Unit
V
Output Current
Output Voltage
Operating Ambient Temperature
IOUT
VOUT
Topr
PD/( VIN- VO)
Gnd-0.3 to VIN+0.3
-40 ~ +85
A
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 VIN=VOUT(T)+2V, VEN=VIN, TA=25 unless otherwise
Parameter
Output Voltage
Output Current
Symbol
VOUT(E)
(Note1)
IO
Condition
VEN=VEHmin, IO=1mA
VOUT>1.2V
Min
-1.5%
1.5
Typ
VOUT(T)
(Note2)
-
Max
1.5%
-
Unit
V
A
Current Limit
ILIM
VOUT>1.2V
1.5 2.0
-
A
Load Regulation
Dropout Voltage
REGLOAD
VDROPOUT
IO=1mA to 1.5A
IO=1.5A
VO=VOUT(E)-2%
1.5V<VOUT(T) 2.0V
2.0V<VOUT(T) 2.8V
2.8V<VOUT(T)
-1
-
-
-
0.2 1
- 1300
- 800
- 600
%
mV
Ground Pin Current
IGND
IO=1mA~1.5A
- 45 -
A
Line Regulation
REGLINE
IO=1mA
VOUT(T)<2.0V
VIN=VOUT(T)+1 to 2.0V VOUT(T)<4.0V
VOUT(T)+2
4.0V VOUT(T)
-0.15
-0.1
-0.4
-
0.02
-
0.15
0.1
0.4
%
Input Voltage
Over Temperature Shutdown
VIN
OTS
Note3
-
-
150
7
-
V
Over Temperature Hysterisis
Output Voltage
Temperature Coefficient
Short Circuit Current
ADJ Input Bias Current
Minimum Load Current
ADJ Reference Voltage
OTH
TC
ISC
IADJ
IMin
VREF
VOUT<0.4V
VIN=5V, VADJ=1.242V
-
-
-
-
1
1.223
30
30
750
1
-
1.242
-
-
-
-
-
1.261
ppm/
mA
A
mA
V
Power Supply Rejection
Output Voltage Noise
EN Input Threshold
EN Input Bias Current
PSRR
eN
VEH
VEL
IEH
IEL
Io=100mA
Co=4.7 F ceramic
f=1kHz
f=10kHz
f=10Hz~100kHz
Io=10mA,
Co=4.7 F
VIN=2.7V to 7V
VIN=2.7V to 7V
VIN=7V
VEN= 0V, VIN=7V
- 50 -
- 20 -
dB
- 30 - Vrms
2.0 - VIN
V
0
- 0.4
V
- - 0.1 A
- - 0.5 A
Shutdown Supply Current
ISD
VIN=5V, VOUT=0V, VEN=0V
- 0.5 2
A
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
GSC2138
Page: 2/7




 GSC2138
ISSUED DATE :2006/04/13
REVISED DATE :
Ordering Information ( contd. )
Part Number
GSC2138-AD
Marking
8CAD2
XXXX
Output Voltage
Adjustable
Part Number
Marking
Output Voltage
Detailed Description
The GSC2138 of COMS regulator contains 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 GSC2138 behaves like a current source when the load reaches 2.2A. However, if the load impedance
drops below 0.3 , the current drops back to 600mA to prevent excessive power dissipation. Normal operation
is restored when the load resistance exceeds 0.75 .
External Capacitors
The GSC2138 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 pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state,
the quiescent current is less than 1 A. This pin behaves much like an electronic switch.
100k resistor is necessary between VEN source and EN pin when VEN is higher than VIN.
(Note: there is no internal pull-up for EN PIN)
Adjustable Version
The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to
5.0V. Vadj is trimmed to 1.242V and Vout is given by the equation:
VOUT=Vadj * (1+R1/R2)
Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will
reduce stability. In general, R1 and R2 in the 10’s of k will produce adequate stability, given reasonable
layout precautions. To improve stability characteristics, keep parasitic on the ADJ pin to minimum, and lower
R1 and R2 values.
GSC2138
Page: 3/7






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