ISSUED DATE :2005/07/05
REVISED DATE :
GQ2131
Description
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
The GQ2131 is a fixed 1.2V of positive, linear regulators feature low quiescent current (60 A typ.) with low
dropout voltage, making them ideal for battery applications.
This rugged device has both Thermal Shutdown, and Current Fold-back to prevent device failure under the
“Worst” of operating conditions.
An additional feature is a “Power Good” detector, which pulls low when the output is out of regulation.
The GQ2131 is stable with an output capacitance of 2.2 F or greater.
Features
&
Low Dropout Voltage
Very
Functional Block Diagram
Applications
&
Battery Powered Widgets
&Instrumentation
&Wireless Devices
&PC Peripherals
&Portable Electronics
&Cordless Phones
&Electronic Scales
&Guaranteed 150mA output
&Over-Temperature Shutdown
&Current Limiting
&Short Circuit Current Fold-back
&Accurate± 3.0%
&Power Good Output Function
&Power-saving Shutdown Mode
&Low Temperature coefficient
Package Dimensions
REF.
A
B
C
D
E
F
Millimeter
Min.
Max.
2.70
3.10
2.60
3.00
1.40
1.80
0.30
0.55
0
0.10
0°
10°
REF.
G
H
I
J
K
L
Dimensions
Millimeter
1.90 REF.
1.20 REF.
0.12 REF.
0.37 REF.
0.60 REF.
0.95 REF.
Typical Application Circuit
1/5
ISSUED DATE :2005/07/05
REVISED DATE :
Fig 1. Typical Application Schematic
Fig 2. Typical Application For Processor
VID Code Power Sequencing Schematic
Pin Description
Pin Number
1
2
3
4
5
Pin Name
V
IN
Gnd
EN
PG
V
OUT
Pin Function
Supply Input
Ground
Enable/Shutdown (Input): CMOS compatible input.
Logic high= enable; Logic low= shutdown. Do not leave open.
Power Good Output
Regulator Output
Ordering Information ( contd. )
Part Number
GQ2131-12
XXXX
Marking
1C122
Output Voltage
1.2V
Part Number
Marking
Output Voltage
The GQ2131 of COMS regulator contains a PMOS pass transistor, voltage reference, error amplifier, over
-current protection, thermal shutdown and Power Good function.
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 300mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 : .
The GQ2131 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GQ2131 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.
The GQ2131 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.
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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Detailed Description
External Capacitors
Enable
ISSUED DATE :2005/07/05
REVISED DATE :
Power Good
The GQ2131 includes the Power Good feature. When the output is not within D
15% of the specified voltage, it
pulls low. This can occur under the following conditions:
1) Input Voltage too low.
2) During Over-Temperature.
3) During Over-Current.
4) If output is pulled up.
(Note: PG pin is an open-drain output.)
Absolute Maximum Ratings
Parameter
Input
Max Voltage
Output Current
Input,
Output Voltage
Operating Ambient Temperature
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Power Dissipation( T=100 : )
EDS Classification
Topr
Tj
Tj
Max
ja
PD
Symbol
V
IN
I
OUT
Ratings
7
P
D
/( V
IN-
V
O)
GND-0.3 to V
IN
+0.3
-40 ~ +85
-40 ~ +125
150
260
380
B
Unit
V
mA
V
:
: /W
mW
Electrical Characteristics Ta=25
Parameter
Output Voltage
Current Limit
Load Regulation
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Input
Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
V
IN
=2.7V, V
EN
= V
IN
,
O
=100uA
unless otherwise noted
Min
-3.0%
150
-4
-
-
-
-0.3
2.7
-
-
-
Symbol
V
O
I
LIM
REG
LOAD
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
OTS
OTH
TC
PSRR
eN
V
EH
V
EL
I
EH
I
EL
I
SD
V
O,SD
V
UV
I
LC
V
OL
T
PGD
Condition
I
O
=0.1mA
V
O
<0.1V
I
O
=0.1mA to 150mA
I
O
=150mA, V
OUT
=V
O
-2%
V
IN
=6V,
I
O
=0mA, V
O
=V
O(NOM)
V
IN
=6V,
I
O
=1mA to150mA
I
O
=0.1mA, V
IN
=2.7V to 6V
TYP
-
Max
3.0%
-
4
1300
80
-
0.3
6
-
-
-
-
-
-
-
V
IN
0.4
-
-
1
0.4
95
-
0.1
5
Unit
V
mA
%
mV
A
A
%
V
:
:
ppm/ :
dB
Vrms
V
V
A
A
A
V
%Vo
(NOM)
A
V
ms
350
1
-
60
65
-
-
150
30
30
50
20
15
30
-
-
0.1
0.1
0.5
-
-
0.1
-
-
Output Voltage
Temperature Coefficient
Power Supply Rejection
Output Voltage Noise
EN
Input
Threshold
EN
Input
Bias Current
Shutdown Supply Current
Shutdown Output Voltage
Output Under Voltage
PG Leakage Current
PG Voltage Low
V
PG
Delay
Note 1: V
IN
(MIN)
=V
OUT
+V
DROPOUT
Io=100mA
Co=2.2 F
f=10Hz to 100kHz
Io=10mA
f=1kHz
f=10kHz
f=100kHz
Co=2.2 F
-
-
-
-
1.6
0
-
-
-
0
-
-
-
1.5
V
EN
=V
IN
V
EN
= 0V
V
IN
=5V, V
O
=0V, V
EN
=0V
Output Loading 1200 , V
EN
=0V
PG ON @ % of V
OUT
V
PG
=6V, PG is off
I
SINK
=0.1mA
See Timing Diagram on page 5
3/5
ISSUED DATE :2005/07/05
REVISED DATE :
Characteristics Curve
4/5
ISSUED DATE :2005/07/05
REVISED DATE :
Timing Diagram
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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