Global Mixed-mode Technology Inc.
3.3V 600mA Low Dropout Regulator
Features
Dropout voltage typically 0.65V @ I
O
= 600mA
Output current in excess of 600mA
Output voltage accuracy +2%
Quiescent current, typically 0.3mA
Internal short circuit current limit
Internal over temperature protection
G903
General Description
The G903 positive 3.3V voltage regulator features the
ability to source 600mA of output current with a
dropout voltage of typically 0.65V. A low quiescent
current is provided. The typical quiescent current is
0.3mA.
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
G903T63U
G903T65U
ORDER NUMBER
(Pb free)
G903T63Uf
G903T65Uf
PACKAGE
SOT223
SOT223
1
GND
V
IN
PIN OPTION
2
3
V
OUT
GND
V
IN
V
OUT
* 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
T6: SOT223
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 Direction
T : Tube
B : Bag
Package Type
Typical Application
[Note 4]: Type of C
OUT
I
O
Top View
Top View
V
IN
C1
1µF
G903
IQ
V
OUT
C
OUT
10µF
1
2
3
SOT-223
Ver: 1.4
Mar 03, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
(Note 1)
Input Voltage………………………………..…….…….7V
Power Dissipation Internally Limited
(Note2)
Maximum Junction Temperature…………………150°C
Storage Temperature Range..……-65°C
≤
T
J
≤+150°C
Reflow Temperature (soldering, 10sec)............260°C
Thermal Resistance Junction to Ambient, (θ
JA
)
SOT-223………………………….…………..…147°C/W
Thermal Resistance Junction to Case, (θ
Jc
)
SOT-223……………………………….…………27°C/W
Note
(1)
: See Recommended Minimum Footprint.
G903
Absolute Maximum Ratings
Operating Conditions
(Note 1)
Input Voltage………….…….…..……..….……4V ~ 6.5V
Temperature Range…………………..-40°C
≤
T
A
≤85°C
Electrical Characteristics
V
IN
=5V, I
O
= 600mA, C
IN
=10µF, C
OUT
=10µF. All specifications apply for T
A
= T
J
= 25°C.[Note 3]
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Ripple Rejection
Dropout Voltage
Output Current
Short Circuit Current
Current Limit
Over Temperature
10mA < I
O
<600mA
4V < V
IN
< 6V, I
O
= 10mA
10mA < I
O
< 600mA
10mA < I
O
< 250mA
V
IN
= 5V
f
i
= 120 Hz, 1V
P-P
, Io = 100mA
I
O
= 600mA
I
O
= 250mA
CONDITION
MIN
3.234
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TYP
3.3
15
20
10
0.3
47
0.65
0.25
600
0.65
0.8
145
MAX
3.366
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UNIT
V
mV
mV
mA
dB
V
mA
A
A
°C
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions
are conditions under which the device functions but the specifications might not be guaranteed. For guaran-
teed 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 150°C and IC will
go into thermal shutdown. The
θ
JA
of SOT223 package is 147°C/W (See Recommended Minimum Footprint).
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 regu-
lator 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 volt-
age. The measurement is made under conditions of low
dissipation or by using pulse techniques such that av-
erage chip temperature is not significantly affected.
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.
Ver: 1.4
Mar 03, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(V
IN
=5V, C
IN
=10µF, C
OUT
=10µF, T
A
=25°C, unless otherwise noted.)
G903
SOT-223 Max. Power Dissipation
vs. PCB Top Copper Area
T
AMB
= 25°C ; Still Air
2.5
SOT-223 Max. Power Dissipation
vs. T
AMB
(still air)
( Different PCB Top Copper Area )
2.5
Max. Dissipation Power (W)
2
1.5
1
0.5
0
25
45
T
AMB
(°C)
65
85
Unit:in
2
A=0.5
Max. Dissipation Power (W)
2
1.5
1
0.5
0
0.5
1.5
2.5
3.5
PCB Top Copper Area (in
2
)
4.5
A=1.0
A=1.5
A=2.0
A=2.5
A=3.0
A=3.5
A=4.0
A=4.5
A=5.0
Recommended Minimum Footprint
SOT-223
Ver: 1.4
Mar 03, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
4
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