ETL GSC2146-28 6 0 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 Datasheet

ISSUED DATE :2006/04/10
REVISED DATE :
GSC2146
6 0 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
Description
The GSC2146 series of positive, linear regulators feature low quiescent current (30 A typ.) with low dropout
voltage, making them ideal for battery applications. The space-saving SOP-8 package is attractive for “Pocket”
and “Hand Held” applications.
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 GSC2146 is stable with an output capacitance of 2.2 F or greater.
Features
Very Low Dropout Voltage
Guaranteed 600mA output
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Factory Pre-set Output Voltage
Highly Accurate± 1.5%
Noise Reduction Bypass Capacitor
L Temperature Coefficient
Block Diagram
Applications
Battery Powered Widgets
Instrumentation
Wireless Devices
Cordless Phones
PC Peripherals
Portable Electronics
Electronic Scales
Package Dimensions
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
0.35
0.49
1.35
1.75
0.375 REF.
45°
1.27 TYP.
Typical Application Circuit
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ISSUED DATE :2006/04/10
REVISED DATE :
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Input Max Voltage
VIN
8
V
Output Current
IOUT
PD/( VIN- VO)
A
Output Voltage
VOUT
1.5~3.8
V
Operating Ambient Temperature
Topr
-40 ~ +85
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Power Dissipation( T=100 )
Tj
-40 ~ +125
Tj Max
150
ja
123.7
PD
810
EDS Classification
B
Electrical Characteristics Ta=25
Parameter
Output Voltage
Output Current
Current Limit
Load Regulation
Dropout Voltage
unless otherwise noted
Symbol
VOUT (E)
Condition
Min
VIN=VOUT(T)+2V, IO=1mA
-1.5%
IO
VIN=VOUT(T)+2V, VO>1.2V
600
ILIM
REGLOAD
VIN=VOUT(T)+2V, VO>1.2V
(Note1)
VDROPOUT
VIN=VOUT(T)+2V, IO=1mA to 600mA
Quiescent Current
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
IQ
REGLINE
Max
Unit
1.5%
V
-
-
mA
600
800
-
mA
%
VOUT(T)
(Note2)
-
0.2
1
1.4V
-
-
1900
IO=600mA
1.4V<VOUT(T)
VO=VOUT(E)-2%
2.0V<VOUT(T)
2.0V
-
-
1400
2.8V
-
-
800
-
-
600
-
30
50
1.4V
-0.2
-
0.2
VIN=VOUT(T)+1 to 1.4V<VOUT(T) 2.0V
VOUT(T)+2
2.0V<VOUT(T)
-0.15
-
0.15
-0.1
0.02
0.1
VIN= VOUT(T)+1V, IO=0mA
1.3V VOUT(T)
IO=1mA
VIN
OTS
OTH
Note3
-
7
-
150
-
-
30
-
TC
-
30
-
-
300
600
Output Voltage
Temperature Coefficient
Short Circuit Current(Note4)
Power Supply Rejection
TYP
1.3V VOUT(T)
2.8V<VOUT(T)
Line Regulation
/W
mW
ISC
PSRR
Output Voltage Noise
EN Input Threshold
EN Input Bias Current
Shutdown Supply Current
eN
VEH
VEL
IEH
IEL
ISD
VIN=VOUT(T)+1V, VOUT<0.8V
Io=100mA
Co=2.2 F ceramic
CBYP=0.01 F
mV
A
%
V
ppm/
mA
f=1kHz
-
75
-
f=10kHz
-
55
-
-
30
-
-
30
-
Vrms
2.0
-
VIN
V
f=100kHz
f=10Hz~100kHz
Io=10mA,
Co=2.2 F
CBYP=0.01 F
VIN=2.7V to 7V
dB
VIN=2.7V to 7V
0
-
0.4
V
VEN=VIN, VIN=2.7V to 7V
-
-
0.1
A
VEN= 0V, VIN=2.7V to 7V
-
-
0.5
A
VIN=5V, VO=0V, VEN<VEL
-
0.5
0.1
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: V IN (MIN) =VOUT+V DROPOUT
4: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before
a current source load is applied.
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ISSUED DATE :2006/04/10
REVISED DATE :
Ordering Information ( contd. )
Part Number
GSC2146-15
GSC2146-25
GSC2146-28
GSC2146-29
GSC2146-31
GSC2146-34
GSC2146-36
GSC2146-38
Marking
6D152
XXXX
6D252
XXXX
6D282
XXXX
6D292
XXXX
6D312
XXXX
6D342
XXXX
6D362
XXXX
6D382
XXXX
Output Voltage
Part Number
1.5V
GSC2146-18
2.5V
GSC2146-27
2.8V
GSC2146-2H
2.9V
GSC2146-30
3.1V
GSC2146-33
3.4V
3.6V
GSC2146-35
GSC2146-37
Marking
6D182
XXXX
6D272
XXXX
6D2H2
XXXX
6D302
XXXX
6D332
XXXX
6D352
XXXX
6D372
XXXX
Output Voltage
1.8V
2.7V
2.85V
3.0V
3.3V
3.5V
3.7V
3.8V
Detailed Description
The GSC2146 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 600mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 .
The GSC2146 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GSC2146 also incorporates current fold-back to reduce power dissipation when
the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces
the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.
External Capacitors
The GSC2146 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.
A third capacitor can be connected between the BY-PASS pin and GND. This capacitor can be a low cost
Polyester Film variety between the value of 0.001~0.01 F. A large capacitor improves the AC ripple rejection,
but also makes the output come up slowly. This “Soft” turn-on is desirable in some applications to limit turn-on
surges.
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
The Enable pin normally floats high. When actively, 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.
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ISSUED DATE :2006/04/10
REVISED DATE :
Characteristics Curve
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ISSUED DATE :2006/04/10
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
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