ISSUED DATE :2005/06/21
REVISED DATE :2005/10/04B
GSC2128
Description
C M O S L o w D r o p o u t Vo l t a g e R e g u l a t o r
The GSC2128 series of positive, linear regulators feature low quiescent 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.
In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground.
The GSC2128 is stable with an output capacitance of 4.7 F or greater.
Features
&
Low Dropout Voltage
Very
Functional Block Diagram
Applications
&
Battery Powered Widgets
&Instrumentation
&Wireless Devices
&PC Peripherals
&Portable Electronics
&Guaranteed 1.5A output
&Over-Temperature Shutdown
&Current Limiting
&Short Circuit Current Fold-back
&Highly Accurate± 1.5%
&Low Temperature Coefficient
‡
&Noise Reduction Bypass Capacitor
&Power-Saving Shutdown Mode
Package Dimensions
REF.
A
B
C
D
E
F
Millimeter
Min.
Max.
5.80
4.80
3.80
0C
0.40
0.19
6.20
5.00
4.00
8C
0.90
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 C
1.27 TYP.
Typical Application Circuit
1/6
ISSUED DATE :2005/06/21
REVISED DATE :2005/10/04B
Absolute Maximum Ratings
Parameter
Input Max Voltage
Output Current
Output Voltage
Operating Ambient Temperature
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Internal Power Dissipation(
EDS Classification
T=100 : )
Symbol
V
IN
I
OUT
V
OUT
Topr
Tj
Tj
Max
jc
PD
Ratings
8
P
D
/( V
IN-
V
O)
1.5~5.0
-40 ~ +85
-40 ~ +125
150
40
810
B
Unit
V
A
V
:
: /W
mW
Electrical Characteristics
V
IN
=V
OUT
(T)+2V, V
EN
=V
IN
, T
A
=25 : unless otherwise
Parameter
Output Voltage
Output Current
Current Limit
Load Regulation
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Symbol
V
OUT
(E)
(Note1)
Condition
V
EN
=V
EH
min,
I
O
=1mA
V
OUT
>1.2V
V
OUT
>1.2V
I
O
=1mA to 1.5A
1.5V<V
OUT
(T)
I
O
=1.5A
V
O
=V
OUT
(E)-2% 2.0V<V
OUT
(T)
I
O
=0mA
I
O
=1mA~1.5A
I
O
=1mA
V
OUT
(T)<2.0V
V
IN
=V
OUT
(T)+1 to
2.0V V
OUT
(T)<4.0V
V
OUT
(T)+2
4.0V V
OUT
(T)
2.0V
2.8V
Min
-1.5%
1.5
1.5
-1
-
-
-
-
-
-0.15
-0.1
-0.4
Note3
-
-
-
Typ
V
OUT
(T)
(Note2)
Max
1.5%
-
-
1
1300
800
600
70
-
0.15
0.1
0.4
7
-
-
-
-
-
-
-
-
-
-
V
IN
0.4
0.1
0.5
2
Unit
V
A
A
%
mV
A
A
%
V
:
:
ppm/ :
mA
dB
dB
Vrms
Vrms
V
V
A
A
A
I
O
I
LIM
REG
LOAD
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
OTS
OTH
TC
I
SC
PSRR
PSRR
eN
eN
V
EH
V
EL
I
EH
I
EL
I
SD
-
2.0
0.2
-
-
-
45
45
-
0.02
-
-
150
30
30
750
50
20
75
55
30
30
-
-
-
-
0.5
2.8V<V
OUT
(T)
Output Voltage
Temperature Coefficient
Short Circuit Current
Power Supply Rejection
Power Supply Rejection
Output Voltage Noise
Output Voltage Noise
EN
Input
Threshold
EN
Input
Bias Current
Shutdown Supply Current
certain I
OUT
value).
V
OUT
<0.4V
Io=100mA
Co=4.7 F
ceramic
Io=100mA
Co=4.7 F
ceramic
C
BYP
=0.01 F
f=10Hz~100kHz
Io=10mA,
C
BYP
=0 F
f=10Hz~100kHz
Io=10mA,
C
BYP
=0.01 F
f=1kHz
f=10kHz
f=1kHz
f=10kHz
Co=4.7 F
Co=4.7 F
-
-
-
-
-
-
-
2.0
0
V
IN
=7V
V
EN
= 0V, V
IN
=7V
V
IN
=5V, V
OUT
=0V, V
EN
=0V
-
-
-
Note 1: V
OUT
(E) =Effective Output Voltage (i.e. the output voltage when “V
OUT
(T) + 2.0V” is provided at the VIN pin while maintaining a
2: V
OUT
(T) =Specified Output Voltage
3: V
IN
(MIN)
=V
OUT
+V
DROPOUT
2/6
Embedded System
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