ISSUED DATE :2006/01/26
REVISED DATE :
GT2133
Description
C M O S P o s i t i v e Vo l t a g e R eg u l a t o r
The GT2133 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 SOT-26 package is attractive for “Pocket” and “Hand Held” 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. In
applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and ground.
The GT2133 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
&Typical Accurate± 1.5%
&Noise Reduction Bypass Capacitor
&Power-saving Shutdown Mode
&Power Good Detector
&Factory Pre-set Output Voltages
&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
1/7
ISSUED DATE :2006/01/26
REVISED DATE :
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
Symbol
V
IN
I
OUT
Topr
Tj
Tj
Max
ja
PD
Ratings
8
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 :
unless otherwise noted
Parameter
Output Voltage
Output Current
Current Limit
Load Regulation
Dropout Voltage
Quiescent Current
Ground Pin Current
Line Regulation
Input
Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Vo Temperature Coefficient
Symbol
V
OUT
(E)
(Note1)
Condition
V
IN
=V
OUT
(T)+2V,
I
O
=1mA
V
IN
=V
OUT
(T)+2V, V
O
>1.2
V
IN
=V
OUT
(T)+2V, V
O
>1.2
V
IN
=V
OUT
(T)+2V,
I
O
=1mA to 300mA
1.2V V
OUT
(T) 2.0V
I
O
=300mA
2.0V<V
OUT
(T) 2.8V
V
O
=V
OUT
(E)-2%
2.8V<V
OUT
(T)
V
IN
= V
OUT
(T)+1V,
I
O
=0mA
Min
-1.5%
300
300
-1
-
-
-
-
TYP
V
OUT
(T)
(Note2)
Max
1.5%
-
-
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
85
75
-
-
1
7
0.4
Unit
V
mA
mA
%
mV
A
A
%
V
:
:
ppm/ :
mA
dB
Vrms
V
V
A
A
A
V
% V
OUT
(T)
% V
OUT
(T)
I
O
I
LIM
REG
LOAD
V
DROPOUT
I
Q
I
GND
REG
LINE
V
IN
OTS
OTH
TC
I
SC
PSRR
eN
V
EH
V
EL
I
EH
I
EL
I
SD
V
O,SD
V
UV
V
OV
-
450
0.2
-
-
-
30
35
-
-
0.02
0.2
-
150
30
30
150
50
20
15
30
-
-
-
-
0.5
-
-
-
-
-
-
-
-
V
IN
= V
OUT
(T)+2V,
I
O
=1mA~300mA
-
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
-
-
-
-
-
-
-
-
2.0
0
-
-
-
0
-
-
115
125
-
-
-
Short Circuit Current
(Note4)
Power Supply Rejection
Output Voltage Noise
EN
Input
Threshold
EN
Input
Bias Current
Shutdown Supply Current
Shutdown Output Voltage
Output Under Voltage
Output Over Voltage
PG Leakage Current
PG Voltage Rating
PG Voltage Low
V
IN
=V
OUT
(T)+1V, V
O
<0.8V
V
IN
=V
OUT
(T)+2V
Io=100mA
Co=2.2 F
f=10Hz~100kHz
Io=10mA
f=1kHz
f=10kHz
f=100kHz
Co=2.2 F
I
LC
V
PG
V
OL
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
2.5V V
OUT
(T) 5.0V
1.2V V
OUT
(T)<2.5V
2.5V V
OUT
(T) 5.0V
1.2V V
OUT
(T)<2.5V
V
PG
=7V
V
O
in regulation
I
SINK
=0.4mA
A
V
V
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
certain I
OUT
value).
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
ISSUED DATE :2006/01/26
REVISED DATE :
Ordering Information ( contd. )
Part Number
GT2133-15
GT2133-25
GT2133-28
GT2133-30
GT2133-33
GT2133-35
GT2133-37
GT2133-2H
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
Marking
3C152
3C252
3C282
3C302
3C332
3C352
3C372
3C2H2
Output Voltage
1.5V
2.5V
2.8V
3.0V
3.3V
3.5V
3.7V
2.85V
Part Number
GT2133-18
GT2133-27
GT2133-29
GT2133-31
GT2133-34
GT2133-36
GT2133-38
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
Marking
3C182
3C272
3C292
3C312
3C342
3C362
3C382
Output Voltage
1.8V
2.7V
2.9V
3.1V
3.4V
3.6V
3.8V
The GT2133 family of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, thermal shutdown and Power Good detection circuitry.
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 GT2133 switches from voltage mode to current mode when the load exceeds the rated output current.
This prevents over-stress. The GT2133 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 GT2133 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 0.001 ~ 0.01uF. 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.
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.
The GT2133 includes the Power Good feature. When the output is not within ±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.)
Detailed Description
External Capacitors
Enable
Power Good
3/7
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