ISSUED DATE :2005/12/12
REVISED DATE :
GQ2181
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 GQ2181 series of positive, linear regulators feature low quiescent current (50 A typ.) with low dropout
voltage and excellent PSRR, thus making them ideal for Telecommunications and other battery applications.
These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under
the “Worst” of operating conditions.
As an additional feature, the GQ2181 is stable with an output capacitance of just extended 0.22 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
&Cellular Phones
&Cameras
&Telecommunications
&Guaranteed 150mA output
&Over-Temperature Shutdown
&Current Limiting
&Short Circuit Current Fold-back
&Excellent PSRR Type 70dB
&Noise Reduction Bypass Capacitor
&Power-saving Shutdown Mode
&Factor Pre-set Output Voltage
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
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ISSUED DATE :2005/12/12
REVISED DATE :
Absolute Maximum Ratings
Parameter
Input
Max Voltage
Output Current
Output Voltage
Operating Ambient Temperature
Junction Temperature
Maximum Junction Temperature
Power Dissipation( T=100 : )
EDS Classification
Symbol
V
IN
I
OUT
V
OUT
Topr
Tj
Tj
Max
PD
Ratings
6
P
D
/( V
IN-
V
O)
1.5~3.3
-40 ~ +85
-40 ~ +125
150
380
B
Unit
V
mA
V
:
mW
Electrical Characteristics T
A
=25
Parameter
Output Voltage
Current Limit
Fold-back Current
Load Regulation
Symbol
V
OUT
(E)
(Note1)
unless otherwise noted
Condition
I
O
=0.1mA, V
OUT
(T) 2.0V
I
O
=0.1mA, V
OUT
(T)<2.0V
I
O
=150mA
V
O
>800mV
V
O
=0V
I
O
=0.1 to 150mA
V
OUT
>2.0V
V
IN
=V
OUT
(T)+0.5V
V
OUT
2.0V
V
IN
=V
OUT
(T)+1V
V
OUT
(T) 2.0V
1.8V V
OUT
(T)<2.0V
1.5V V
OUT
(T)<1.8V
(V
OUT
(T)>2.0V V
IN
=V
OUT
(T)+0.5V; V
OUT
(T) 2.0V V
IN
=V
OUT
(T)+1V; V
SHDN
=V
IN
, C
IN
=C
OUT
=1uF)
Min
-1.0
-1.5
-2.0
150
-
-1
-2
-
-
-
-
-
-0.2
-0.4
Note3
-
-
-
TYP
V
OUT
(T)
(Note2)
Max
1.0
1.5
2.0
-
-
1
Unit
%
mA
A
%
I
LIM
I
FB
REG
LOAD
200
80
0.5
-
300
700
900
60
50
0.1
-
-
137
23
30
70
30
-
-
0.01
0.5
-
2
500
1000
1300
-
-
0.2
%
0.4
5.5
-
-
-
-
-
V
IN
0.6
-
1
0.4
V
:
:
ppm/ :
dB
Vrms
V
V
A
A
V
A
A
mV
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Input
Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
OTS
OTH
TC
PSRR
eN
V
SHDNH
V
SHDNL
I
SD
V
O,SD
I
O
=150mA
V
O
=V
OUT
(E)-2%
V
IN
=5V,
I
O
=0mA
V
IN
=5V,
I
O
=1mA to150mA
I
O
=0.1mA, V
OUT
>2.0V
V
IN
=V
OUT
(T)+0.5V to 5.5V
I
O
=0.1mA, V
OUT
2.0V
V
IN
=V
OUT
(T)+1V to 5.5V
Output Voltage
Temperature Coefficient
Power Supply Rejection
Output Voltage Noise
SHDN
Input
Threshold
SHDN
Input
Bias Current
Shutdown Supply Current
Shutdown Output Voltage
Ro=100
,Co=2.2mF, f=1kHz
f=10Hz~100kHz,
Io=10mA,
Co=2.2 F
V
SHDN
=0.8* V
IN
V
SHDN
=0.6V
V
IN
=5V, EN=0v, or 5V
V
IN
=5V, V
O
=0V
Output Loading 1200 , Vo=0V
-
-
0.8* V
IN
0
-
-
0
Note 1: V
OUT
(E) =Effective Output Voltage (i.e. the output voltage when “V
OUT
(T)>2.0V V
IN
=V
OUT
(T)+0.5V; V
OUT
(T) 2.0V V
IN
=V
OUT
(T)+1V;
V
SHDN
=V
IN
” 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
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ISSUED DATE :2005/12/12
REVISED DATE :
Ordering Information ( contd. )
Part Number
GQ2181-15
GQ2181-20
GQ2181-27
GQ2181-2H
GQ2181-32
XXXX
XXXX
XXXX
XXXX
XXXX
Marking
1L152
1L202
1L272
1L2H2
Output Voltage
1.5V
2.0V
2.7V
2.85V
3.2V
Part Number
GQ2181-18
GQ2181-25
GQ2181-28
GQ2181-30
GQ2181-33
XXXX
XXXX
XXXX
XXXX
XXXX
Marking
1L182
Output Voltage
1.8V
2.5V
2.8V
3.0V
3.3V
1L252
1L282
1L302
1L332
1L322
The GQ2181 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 150mA. During thermal shutdown, the output voltage remains low. Normal
operation is restored when the junction temperature drops below 120 : .
The GQ2181 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GQ2181 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 GQ2181 is stable with an output capacitance to ground of 0.22 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.
A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should
be at least 1 F to have a beneficial effect.
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.
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.
Detailed Description
External Capacitors
Shutdown
Characteristics Curve
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ISSUED DATE :2005/12/12
REVISED DATE :
4/5
ISSUED DATE :2005/12/12
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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