ISSUED DATE :2006/05/16
REVISED DATE :
GJ2137
Description
7 5 0 m A 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 GJ2137 series of positive, linear regulators feature low quiescent current (30 A typ.) with low dropout
voltage, making them ideal for battery applications.
These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under
the “Worst” of operating conditions.
The GJ2137 is stable with an output capacitance of 2.2 F or greater.
Features
&
Low Dropout Voltage
Very
Functional Block Diagram
&Guaranteed 750mA output
&Over-Temperature Shutdown
&Current Limiting
&Short Circuit Current Fold-back
&Highly Accurate± 1.5%
&Low Temperature Coefficient
Applications
&
Battery Powered Widgets
&Instrumentation
&Wireless Devices
&PC Peripherals
&Portable Electronics
Package Dimensions
TO-252
REF.
A
B
C
D
E
F
S
Millimeter
Min.
Max.
6.40
6.80
5.20
5.50
6.80
7.20
2.40
3.00
2.30 REF.
0.70
0.90
0.60
0.90
REF.
G
H
J
K
L
M
R
Millimeter
Min.
Max.
0.50
0.70
2.20
2.40
0.45
0.55
0
0.15
0.90
1.50
5.40
5.80
0.80
1.20
Typical Application Circuit
GJ2137
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ISSUED DATE :2006/05/16
REVISED DATE :
Absolute Maximum Ratings
Parameter
Input Max Voltage
Output Current
Output Voltage
Operating Ambient Temperature
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Internal Power Dissipation ( T=100 : )
EDS Classification
Symbol
V
IN
I
OUT
V
OUT
Topr
Tj
Tj
Max
jc
PD
Ratings
8
1
1.5~3.8
-40 ~ +85
-40 ~ +125
150
60
3
B
Unit
V
A
V
:
:
:
: /W
W
Electrical Characteristics
V
IN
=V
OUT
(T)+2V, Ta=25 : unless otherwise noted
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
Vo Temperature Coefficient
Symbol
V
OUT
(E)
(Note1)
Condition
I
O
=1mA
V
O
>1.2V
V
O
>1.2V
V
IN
=V
OUT
(T)+2V,
I
O
=1mA to 750mA
I
O
=750mA
V
O
=V
OUT
(E)-2%
1.4V<V
OUT
(T) 2.0V
2.0V<V
OUT
(T) 2.8V
2.8V<V
OUT
(T)
Min
-1.5%
750
750
-1
-
-
-
-
-
-0.15
-0.1
Note3
-
-
-
TYP
V
OUT
(T)
(Note2)
Max
1.5%
-
-
1
1400
800
600
50
-
0.15
0.1
7
-
-
-
600
-
-
-
-
Unit
V
mA
mA
%
mV
A
A
%
V
:
:
ppm/ :
mA
dB
Vrms
I
O
I
LIM
REG
LOAD
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
OTS
OTH
TC
I
SC
PSRR
eN
-
850
0.2
-
-
-
30
35
-
0.02
-
150
30
30
300
50
20
10
30
V
IN
= V
OUT
(T)+2V,
I
O
=0mA
V
IN
= V
OUT
(T)+2V,
I
O
=1mA~750mA
I
O
=1mA
1.4V<V
OUT
(T) 2.0V
V
IN
=V
OUT
(T)+1 to
2.0V<V
OUT
(T)<4.0V
V
OUT
(T)+2
Short Circuit Current
Power Supply Rejection
Output Voltage Noise
V
IN
=V
OUT
(T)+1V, V
OUT
<0.8V
f=1kHz
f=10kHz
f=100kHz
f=10Hz~100kHz,
Io=10mA,
Co=2.2 F
Io=100mA
Co=2.2 F
-
-
-
-
-
Note 1: V
OUT
(E) =Effective Output Voltage (i.e. the output voltage when “V
OUT
(T) + 2.0V” is provided at the V
IN
pin while maintaining a
certain
I
OUT
value).
2: V
OUT
(T) =Specified Output Voltage
3: V
IN
(MIN)
=V
OUT
+V
DROPOUT
GJ2137
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ISSUED DATE :2006/05/16
REVISED DATE :
Ordering Information ( contd. )
Part Number
GJ2137-15
GJ2137-25
GJ2137-28
GJ2137-30
GJ2137-33
GJ2137-35
GJ2137-3.7
GJ2137-2H
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
Marking
7T152
7T252
7T282
7T302
7T332
7T352
Output Voltage
1.5V
2.5V
2.8V
3.0V
3.3V
3.5V
3.7V
2.85V
Part Number
GJ2137-18
GJ2137-27
GJ2137-29
GJ2137-31
GJ2137-34
GJ2137-36
GJ2137-38
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
Marking
7T182
7T272
7T292
7T312
7T342
7T362
7T382
Output Voltage
1.8V
2.7V
2.9V
3.1V
3.4V
3.6V
3.8V
7T372
7T2H2
The GJ2137 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
150 : , or the current exceeds 750mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 : .
The GJ2137 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GJ2137 also incorporates current fold-back to reduce power dissipation when
the output is short circuited. This feature becomes active when the output drops below 0.8V and reduces the
current flow by 65%. Full current is restored when the voltage exceeds 0.8V.
Detailed Description
The GJ2137 is stable with an output capacitance to ground of 2.2 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.
External Capacitors
GJ2137
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ISSUED DATE :2006/05/16
REVISED DATE :
Characteristics Curve
GJ2137
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ISSUED DATE :2006/05/16
REVISED DATE :
Important Notice:
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM.
GTM reserves the right to make changes to its products without notice.
GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems.
GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
Head Office And Factory:
Taiwan:
No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C.
TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785
China:
(201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China
TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165
GJ2137
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