ETL GQ2181-2H 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 :2005/12/12
REVISED DATE :
GQ2181
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 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
Very Low Dropout Voltage
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
Functional Block Diagram
Applications
Battery Powered Widgets
Instrumentation
Wireless Devices
PC Peripherals
Portable Electronics
Cordless Phones
Electronic Scales
Cellular Phones
Cameras
Telecommunications
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
Symbol
Ratings
Unit
Input Max Voltage
VIN
6
V
Output Current
IOUT
PD/( VIN- VO)
mA
Output Voltage
VOUT
1.5~3.3
V
Operating Ambient Temperature
Topr
-40 ~ +85
Junction Temperature
Maximum Junction Temperature
Power Dissipation( T=100 )
Tj
-40 ~ +125
Tj Max
150
PD
380
EDS Classification
mW
B
Electrical Characteristics TA=25
unless otherwise noted
(VOUT(T)>2.0V VIN=VOUT(T)+0.5V; VOUT(T) 2.0V VIN=VOUT(T)+1V; VSHDN=VIN, CIN=COUT=1uF)
Parameter
Output Voltage
Current Limit
Fold-back Current
Load Regulation
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Output Voltage
Temperature Coefficient
Power Supply Rejection
Output Voltage Noise
SHDN Input Threshold
SHDN Input Bias Current
Shutdown Supply Current
Shutdown Output Voltage
Symbol
VOUT (E)
(Note1)
ILIM
IFB
REGLOAD
VDROPOUT
IQ
IGND
Condition
Min
IO=0.1mA, VOUT(T) 2.0V
-1.0
IO=0.1mA, VOUT(T)<2.0V
-1.5
TYP
VOUT(T)
(Note2)
Max
Unit
1.0
1.5
%
IO=150mA
-2.0
VO>800mV
150
200
-
mA
VO=0V
A
IO=0.1 to 150mA
IO=150mA
VO=VOUT(E)-2%
2.0
-
80
-
VOUT>2.0V
VIN=VOUT(T)+0.5V
-1
0.5
1
VOUT 2.0V
VIN=VOUT(T)+1V
-2
-
2
%
VOUT(T) 2.0V
-
300
500
1.8V VOUT(T)<2.0V
-
700
1000
1.5V VOUT(T)<1.8V
-
900
1300
mV
VIN=5V, IO=0mA
-
60
-
A
VIN=5V, IO=1mA to150mA
-
50
-
A
IO=0.1mA, VOUT>2.0V
VIN=VOUT(T)+0.5V to 5.5V
-0.2
0.1
0.2
IO=0.1mA, VOUT 2.0V
VIN=VOUT(T)+1V to 5.5V
-0.4
-
0.4
VIN
OTS
OTH
Note3
-
5.5
-
137
-
-
23
-
TC
-
30
-
ppm/
-
70
-
dB
f=10Hz~100kHz, Io=10mA, Co=2.2 F
-
30
-
Vrms
VSHDN=0.8* VIN
0.8* VIN
-
VIN
V
VSHDN=0.6V
0
-
0.6
V
VIN=5V, EN=0v, or 5V
-
0.01
-
A
VIN=5V, VO=0V
-
0.5
1
A
Output Loading 1200 , Vo=0V
0
-
0.4
V
REGLINE
PSRR
eN
VSHDNH
VSHDNL
ISD
VO,SD
Ro=100 ,Co=2.2mF, f=1kHz
%
V
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT(T)>2.0V VIN=V OUT(T)+0.5V; V OUT(T) 2.0V V IN=VOUT(T)+1V;
VSHDN=VIN” is provided at the VIN pin while maintaining a certain IOUT value).
2: VOUT (T) =Specified Output Voltage
3: VIN (MIN) =VOUT+VDROPOUT
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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
Marking
1L152
XXXX
1L202
XXXX
1L272
XXXX
1L2H2
XXXX
1L322
XXXX
Output Voltage
Part Number
1.5V
GQ2181-18
2.0V
GQ2181-25
2.7V
GQ2181-28
2.85V
GQ2181-30
3.2V
GQ2181-33
Marking
1L182
XXXX
1L252
XXXX
1L282
XXXX
1L302
XXXX
1L332
XXXX
Output Voltage
1.8V
2.5V
2.8V
3.0V
3.3V
Detailed Description
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.
External Capacitors
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.
Shutdown
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.
Characteristics Curve
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ISSUED DATE :2005/12/12
REVISED DATE :
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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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