ETL GJ2137-30 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 Datasheet

ISSUED DATE :2006/05/16
REVISED DATE :
GJ2137
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
Description
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
Very Low Dropout Voltage
Guaranteed 750mA output
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Highly Accurate± 1.5%
Low Temperature Coefficient
Functional Block Diagram
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
Page: 1/5
ISSUED DATE :2006/05/16
REVISED DATE :
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Input Max Voltage
VIN
8
V
Output Current
IOUT
1
A
Output Voltage
VOUT
1.5~3.8
V
Operating Ambient Temperature
Topr
-40 ~ +85
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Internal Power Dissipation ( T=100 )
Tj
-40 ~ +125
Tj Max
150
jc
60
PD
3
EDS Classification
B
Electrical Characteristics VIN=VOUT(T)+2V, Ta=25
Parameter
Output Voltage
/W
W
unless otherwise noted
Symbol
VOUT (E)
Condition
Min
IO=1mA
-1.5%
(Note1)
TYP
VOUT(T)
(Note2)
Max
Unit
1.5%
V
Output Current
Current Limit
Load Regulation
IO
ILIM
VO>1.2V
750
-
-
mA
VO>1.2V
750
850
-
mA
REGLOAD
VIN=VOUT(T)+2V, IO=1mA to 750mA
-1
0.2
1
%
1.4V<VOUT(T) 2.0V
-
-
1400
Dropout Voltage
VDROPOUT
2.0V<VOUT(T) 2.8V
-
-
800
2.8V<VOUT(T)
-
-
600
Quiescent Current
Ground Pin Current
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Vo Temperature Coefficient
Short Circuit Current
Power Supply Rejection
Output Voltage Noise
IQ
IGND
REGLINE
VIN
OTS
OTH
TC
ISC
PSRR
eN
IO=750mA
VO=VOUT(E)-2%
mV
VIN= VOUT(T)+2V, IO=0mA
-
30
50
A
VIN= VOUT(T)+2V, IO=1mA~750mA
IO=1mA
1.4V<VOUT(T) 2.0V
VIN=VOUT(T)+1 to
2.0V<VOUT(T)<4.0V
VOUT(T)+2
-
35
-
A
-0.15
-
0.15
-0.1
0.02
0.1
Note3
-
7
-
150
-
-
30
-
-
30
-
VIN=VOUT(T)+1V, VOUT<0.8V
-
300
600
f=1kHz
Io=100mA
f=10kHz
Co=2.2 F
f=100kHz
f=10Hz~100kHz, Io=10mA, Co=2.2 F
-
50
20
10
30
-
%
V
ppm/
mA
dB
Vrms
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) =V OUT+VDROPOUT
GJ2137
Page: 2/5
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
Marking
7T152
XXXX
7T252
XXXX
7T282
XXXX
7T302
XXXX
7T332
XXXX
7T352
XXXX
7T372
XXXX
7T2H2
XXXX
Output Voltage
Part Number
1.5V
GJ2137-18
2.5V
GJ2137-27
2.8V
GJ2137-29
3.0V
GJ2137-31
3.3V
GJ2137-34
3.5V
GJ2137-36
3.7V
GJ2137-38
Marking
7T182
XXXX
7T272
XXXX
7T292
XXXX
7T312
XXXX
7T342
XXXX
7T362
XXXX
7T382
XXXX
Output Voltage
1.8V
2.7V
2.9V
3.1V
3.4V
3.6V
3.8V
2.85V
Detailed Description
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.
External Capacitors
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.
GJ2137
Page: 3/5
ISSUED DATE :2006/05/16
REVISED DATE :
Characteristics Curve
GJ2137
Page: 4/5
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
Page: 5/5
Similar pages