ISSUED DATE :2004/12/16
REVISED DATE :
GQ2123
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 GQ2123 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.
In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground.
The GQ2123 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 300mA output
&Over-Temperature Shutdown
&Current Limiting
&Short Circuit Current Fold-back
&Highly Accurate± 1.5%
&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
1/7
ISSUED DATE :2004/12/16
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
8
P
D
/( V
IN-
V
O)
1.5~5.0
-40 ~ +85
-40 ~ +125
150
380
B
Unit
V
mA
V
:
mW
Electrical Characteristics Ta=25
Parameter
Output Voltage
Output Current
Current Limit
Load Regulation
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Symbol
V
OUT
(E)
(Note1)
unless otherwise noted
Condition
V
IN
=V
OUT
(T)+2V,
I
O
=1mA
V
IN
=V
OUT
(T)+2V,
I
O
=300mA
Min
-1.5%
-2.5%
300
300
-1
-
-
-
-
-
TYP
V
OUT
(T)
(Note2)
Max
1.5%
2.5%
-
-
1
1300
400
300
50
-
0.2
0.15
0.1
0.4
7
-
-
-
300
-
-
-
-
V
IN
0.4
0.1
0.5
1
0.4
Unit
V
V
mA
mA
%
mV
A
A
I
O
I
LIM
REG
LOAD
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
=V
OUT
(T)+2V, V
OUT
V
OUT
(E)*0.96
V
IN
=V
OUT
(T)+2V, V
O
>1.2V
V
IN
=V
OUT
(T)+2V,
I
O
=1mA to 300mA
1.2V V
OUT
(T) 2.0V
I
O
=300mA
V
O
=V
OUT
(E)-2% 2.0V<V
OUT
(T) 2.8V
2.8V<V
OUT
(T)
V
IN
= V
OUT
(T)+1V,
I
O
=0mA
V
IN
= V
OUT
(T)+2V,
I
O
=1mA~300mA
-
450
0.2
-
-
-
30
35
-
-
0.02
0.2
-
150
30
30
150
60
50
20
30
-
-
-
-
0.5
-
1.2V V
OUT
(T) 1.4V -0.2
I
O
=1mA
V
IN
=V
OUT
(T)+1 to 1.4V<V
OUT
(T) 2.0V -0.15
V
OUT
(T)+2
2.0V<V
OUT
(T)<4 ` ˆ Ø -0.1
4.0V V
OUT
(T)
-0.4
Note3
-
-
-
V
IN
=V
OUT
(T)+1V, V
OUT
<0.8V
Io=100mA
Co=2.2 F
f=100Hz
f=1kHz
f=10kHz
-
-
-
-
-
2.0
0
-
-
-
0
%
Input
Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
V
IN
OTS
OTH
TC
I
SC
PSRR
eN
V
EH
V
EL
I
EH
I
EL
I
SD
V
O,SD
V
:
:
ppm/ :
mA
dB
Vrms
V
V
A
A
A
V
Output Voltage
Temperature Coefficient
Short Circuit Current
(Note4)
Power Supply Rejection
Output Voltage Noise
EN
Input
Threshold
EN
Input
Bias Current
Shutdown Supply Current
Shutdown Output Voltage
certain I
OUT
value).
f=10Hz~100kHz
Co=2.2 F
Io=10mA
V
IN
=2.7V to 7V
V
IN
=2.7V to 7V
V
EN
=V
IN
, V
IN
=2.7V to 7V
V
EN
= 0V, V
IN
=2.7V to 7V
V
IN
=5V, V
O
=0V, V
EN
<V
EL
Io=0.4mA,
V
EN
<V
EL
Note 1: V
OUT
(E) =Effective Output Voltage (i.e. the output voltage when “V
OUT
(T) + 2.0V” is provided at the V
IN
pin while maintaining a
2: V
OUT
(T) =Specified Output Voltage
3: V
IN
(MIN)
=V
OUT
+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.
2/7
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