Global Mixed-mode Technology Inc.
G940/G941
3.7V 400mA Low Dropout Regulator
Features
Dropout voltage typically 0.8V @ I
O
= 400mA
Output current in excess of 400mA
Output voltage accuracy +3%/-2%
Quiescent current, typically 600µA
Internal short circuit current limit
Internal over temperature protection
General Description
The G940/G941 positive 3.7V voltage regulator fea-
tures the ability to source 400mA of output current
with a dropout voltage of typically 0.8V over the en-
tire operating temperature range. A low quiescent
current is provided over the entire output current
range. The typical quiescent current is 0.6mA. Fur-
thermore, the quiescent current is smaller when the
regulator is in the dropout mode (V
IN
< 3.7V).
Familiar regulator features such as over temperature
and over current protection circuits are provided to
prevent it from being damaged by abnormal operating
conditions.
Ordering Information
ORDER NUMBER
G940T21U
G941T24U
G940T73U
PACKAGE TYPE
SOT 89
SOT 89
SOT 23
1
V
OUT
GND
GND
PIN OPTION
2
GND
V
IN
V
OUT
3
V
IN
V
OUT
V
IN
*For other package types, pin options and package, please contact us at sales
@
gmt.com.tw
Order Number Identification
GXXX
XX
X
X
Packing Type
Pin Option
Package Type
Part Number
PACKAGE TYPE
T2 : SOT 89
T6 : SOT 223
T7 : SOT 23
T8 : µTO92
1
1 : V
OUT
2 : V
OUT
3 : GND
4 : GND
5 : V
IN
6 : V
IN
PIN OPTION
2
GND
V
IN
V
OUT
V
IN
GND
V
OUT
3
V
IN
GND
V
IN
V
OUT
V
OUT
GND
PACKING
U & D : Tape & Reel D Direction
T : Tube
B : Bag
Typical Application
[Note 4] : Type of C
OUT
Package Type
3
I
O
V
IN
G940
C1
0.47µF
IQ
V
OUT
C
OUT
10µF
Top View
Top View
Top View
Top View
Top View
1
2
1
2
3
1
2
3
SOT 89、223
、
µTO 92
SOT 23
Ver: 5.5
May 13, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
(Note 1)
Input Voltage……………………………..……..…..…10V
Power Dissipation Internally Limited
..(Note 2)
Maximum Junction Temperature………….….…...150°C
Storage Temperature Range…..…..…..-65°C
≤
T
J
≤+150°C
Lead Temperature, Time for Wave Soldering
SOT 89, SOT23 Package….….…..……..…....260°C, 4s
Continuous Power Dissipation (T
A
= + 25°C)
SOT 23
(1)
…….…………………….….……….……...0.3W
SOT 89
(1)
……………………….………..………..…0.42W
Note
(1)
: See Recommended Minimum Footprint.
Absolute Maximum Ratings
(Note 1)
Input Voltage………………………….…………….4V~7V
Temperature Range………………….…0°C
≤
T
J
≤125°C
Operating Conditions
G940/G941
Electrical Characteristics
V
IN
=5V, I
O
= 400mA, C
IN
= 1 µF, C
OUT
=10 µF, All specifications apply for T
A
= T
J
= 25°C. [Note 3]
PARAMETER
Output Voltage Accuracy
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
Ripple Rejection
Dropout Voltage
Short Circuit Current
Over Temperature
CONDITIONS
I
O
= 10mA
V
IN
= 4V to 7V, I
O
= 50mA
I
O
= 10mA to 400mA
100mA DC and 100mA AC, fo = 120Hz
V
IN
=5V
f
i
= 120 Hz, 1V
P-P
, Io = 100mA
I
O
= 400mA
I
O
= 100mA
MIN
-2
-
-
-
-
-
-
-
-
-
TYP
-
0.08
-
100
0.6
42
0.8
130
0.76
125
MAX
+3
0.9
2.2
-
-
-
0.9
150
-
-
UNITS
%
%/V
%
mΩ
mA
dB
V
mV
A
°C
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Condi-
tions are conditions under which the device functions but the specifications might not be guaranteed. For
guaranteed specifications and test conditions see the Electrical Characteristics.
Note2:
The maximum power dissipation is a function of the maximum junction temperature, T
Jmax
; total thermal re-
sistance,
θ
JA
, and ambient temperature T
A
. The maximum allowable power dissipation at any ambient tem-
perature is T
jmax
-T
A
/
θ
JA
. If this dissipation is exceeded, the die temperature will rise above 130°C and IC
will go into thermal shutdown. For the G940/G941 in SOT 23 package,
θ
JA
is 350°C/W and in the SOT 89
package is 250°C/W (See Recommend Minimum Footprint). The safe operation in SOT 23 & SOT 89
package, it can see “Typical Performance Characteristics” (Safe Operating Area).
Note3:
Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as
possible.
Note4:
The type of output capacitor should be tantalum or aluminum.
Definitions
Dropout Voltage
The input/output Voltage differential at which the
regulator output no longer maintains regulation against
further reductions in input voltage. Measured when the
output drops 100mV below its nominal value, dropout
voltage is affected by junction temperature, load cur-
rent and minimum input supply requirements.
Line Regulation
The change in output voltage for a change in input
voltage. The measurement is made under conditions
of low dissipation or by using pulse techniques such
that average chip temperature is not significantly af-
fected.
Ver: 5.5
May 13, 2002
Load Regulation
The change in output voltage for a change in load
current at constant chip temperature. The measure-
ment is made under conditions of low dissipation or by
using pulse techniques such that average chip tem-
perature is not significantly affected.
Maximum Power Dissipation
The maximum total device dissipation for which the
regulator will operate within specifications.
Quiescent Bias Current
Current which is used to operate the regulator chip
and is not delivered to the load.
TEL: 886-3-5788833
http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(V
IN
=5V, C
IN
=1µF, C
OUT
=10µF, T
A
=25°C, unless otherwise noted.)
G940/G941
Load Transient
Line Transient
Ch1: Vout (offset=3.70V)
Ch2: Vin (offset=5.0V)
Iout=100mA
Ch1: Iout (400mA/div)
Ch2: Vout (offset=3.70V)
Output Voltage Accuracy vs. Load Current
2.000%
Dropout Voltage vs. Load Current
900
800
Output Voltage Accuracy
Dropout Voltage (mV)
1.500%
700
600
500
400
300
200
100
1.000%
0.500%
0.000%
-0.500%
-1.000%
0
50
100 150 200 250 300 350 400 450 500 550 600
0
0
50
100
150
200
250
300
350
400
450
Load Current (mA)
Load Current (mA)
Ground Current vs. Load Current
2.0
1.8
1.6
Ground Current (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
50
100
Load Current (mA)
150
200
250
300
350
400
Ver: 5.5
May 13, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
G940/G941
Maximum Power Dissipation of SOT 23
Safe Operating Area
[Power Dissipation Limit]
500
450
400
350
300
250
200
150
100
50
0
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
1oz Copper on SOT 23 Package
Mounted on recommended mimimum footprint (RθJA=350°C/W)
TA=25℃
TA=55℃
TA=85℃
0.5
Maximum Recommended Output Current
T
A
=25°C,Still Air
0.4
Power Dissipation (W)
Output Current (mA)
0.3
0.2
0.1
Still Air
1oz Copper on SOT 23 Package
Mounted on recommend mimimum footprint (RθJA=350°C/W)
0.0
25
35
45
55
65
75
85
95
105
115
125
Input-Output Voltage Differential V
IN
-V
OUT
(V)
Note: V
IN(max)
<= 6.5V
Amibent Temperature T
A
(°C)
Safe Operating Area
[Power Dissipation Limit]
500
450
400
Maximum Recommended Output Current
T
A
=25°C,Still Air
Maximum Power Dissipation of SOT 89
0.6
0.5
Output Current (mA)
350
300
250
200
150
100
50
0
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
1oz Copper on SOT 89 Package
Mounted on recommended mimimum footprint (RθJA=250°C/W)
TA=25℃
TA=55℃
TA=85℃
Power Dissipation (W)
0.4
0.3
0.2
0.1
0
25
35
45
55
65
75
85
95
105
115
125
Still Air
1oz Copper on SOT 89 Package
Mounted on recommend mimimum footprint (RθJA=250°C/W)
Input-Output Voltage Differential V
IN
-V
OUT
(V)
Note: V
IN(max)
<= 6.5V
Amibent Temperature T
A
(°C)
Recommend Minimum Footprint
Ver: 5.5
May 13, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Package Information
D
D1
G940/G941
POLISH
E
HE
A1
e
C
MATTE FINISH
A
b
b1
b
POLISH
SOT-89 (T2) Package
SYMBOLS
A
A1
b
b1
C
D
D1
HE
E
e
DIMENSIONS IN MILLIMETERS
MIN
NOM
MAX
1.40
0.80
0.36
0.41
038
4.40
1.40
-----
2.40
2.90
1.50
1.04
0.42
0.47
0.40
4.50
1.60
-----
2.50
3.00
1.60
-----
0.48
0.53
0.43
4.60
1.75
4.25
2.60
3.10
DIMENSIONS IN INCHES
MIN
NOM
MAX
0.055
0.031
0.014
0.016
0.014
0.173
0.055
-----
0.094
0.114
0.059
0.041
0.016
0.018
0.015
0.177
0.062
-----
0.098
0.118
0.063
-----
0.048
0.020
0.017
0.181
0.069
0.167
0.102
0.122
Ver: 5.5
May 13, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
5
