Description
GM6603 of positive adjustable and fixed regulators are de-
signed to provide 3.0A output with low dropout voltage per-
formance.
On-chip trimming adjusts the reference voltage to 2.0%. To
work in post regulators or microprocessor power supplies
where low voltage operation and fast transient response
are required.
Device includes over-current protection and thermal shut-
down protection as well.
Pin-to-pin compatible with LT1085 family of regulators,
GM6603 is available in TO-252, TO-220, and surface-
mount TO-263 packages.
Features
Adjustable or Fixed Output
Output Current of 3.0A
Dropout Voltage (typical) 1.15V @ 3.0A
Typical Line Regulation 0.04%
Typical Load Regulation 0.2%
Fast Transient Response
Current Limit Protection
Thermal Shutdown Protection
Application
Microprocessor Supply
Post Regulators for Switching Supplies
Printer Supplies
Motherboards
Telecommunication Systems
TYPICAL APPLICATION CIRCUITS
(Adjustable Version)
(Fixed Version)
V
IN
> 4.75V
GM6603-Adj
3
V
IN
ADJ
V
OUT
2
R1
133W
1.0%
R2
232W
1.0%
V
OUT
= 3.45V
V
IN
> 4.75V
3
GM6603-3.3
V
OUT
2
V
IN
GND
V
OUT
= 3.3V
+
1
C1
10µF
Tant
+
C2
10µF
Tant. Min
+
1
C1
10µF
Tant
+
C2
10µF
Tant. Min
V
OUT
=
V
REF
X (1 +
R2
) + I
ADJ
X
R2
R1
Notes:
1. C1 needed if device is far from filter capacitors
2. C2 minimum value required for stability
www.gammamicro.com
GM6603
V0.1
1
MARKING INFORMATION & PIN CONFIGURATIONS
(Top View)
TO-252(DPAK)
TO-220
TO-263-2 (D PAK)
2
GM6603
VVAYWW
GM6603
GM6603
VVAYWW
VVAYWW
V
IN
V
OUT
ADJ/GND*
V
OUT
V V, V = Output Voltage(A =
Adj
,33 = 3.3V)
A
= Assembly Location
Y
= Year
W W = Weekly
V
IN
V
OUT
V
IN
ADJ/GND*
ADJ/GND*
On fixed versions Pin 1 = GND,
on adjustable versions Pin 1 = ADJ
Tab = V
OUT
ORDERING INFORMATION
Ordering Number
GM6603-ATA3T
GM6603-ATA3R
GM6603-ATC3T
GM6603-ATC3R
GM6603-ATB3T
GM6603-1.5TA3T
GM6603-1.5TA3R
GM6603-1.5TB3T
GM6603-1.8TA3T
GM6603-1.8TA3R
GM6603-1.8TC3T
GM6603-1.8TC3R
GM6603-1.8TB3T
GM6603-2.5TA3T
GM6603-2.5TA3R
GM6603-2.5TB3T
GM6603-2.85TA3T
GM6603-2.85TA3R
GM6603-2.85TB3T
Output Voltage
Adj
Adj
Adj
Adj
Adj
1.5
1.5
1.5
1.8
1.8
1.8
1.8
1.8
2.5
2.5
2.5
2.85
2.85
2.85
3.0
3.0
3.0
3.0
3.0
Package
TO-263-2
TO-263-2
TO-252
TO-252
TO-220
TO-263-2
TO-263-2
TO-220
TO-263-2
TO-263-2
TO-252
TO-252
TO-220
TO-263-2
TO-263-2
TO-220
TO-263-2
TO-263-2
TO-220
TO-263-2
TO-263-2
TO-252
TO-252
TO-220
Shipping
50 Units/ Tube
800 Units / Tape &Reel
80 Units / Tube
2,500 Units / Tape & Reel
50 Units / Tube
50 Units/ Tube
800 Units / Tape &Reel
50 Units / Tube
50 Units/ Tube
800 Units / Tape &Reel
80 Units / Tube
2,500 Units / Tape & Reel
50 Units / Tube
50 Units/ Tube
800 Units / Tape &Reel
50 Units / Tube
50 Units/ Tube
800 Units / Tape &Reel
50 Units / Tube
50 Units/ Tube
800 Units / Tape &Reel
80 Units / Tube
2,500 Units / Tape & Reel
50 Units / Tube
GM6603
GM6603-3.0TA3T
GM6603-3.0TA3R
GM6603-3.0TC3T
GM6603-3.0TC3R
GM6603-3.0TB3T
* For detail Ordering Number identification, please see last page.
2
ORDERING INFORMATION
(Continued)
Ordering Number
GM6603-3.3TA3T
GM6603-3.3TA3R
GM6603-3.3TC3T
GM6603-3.3TC3R
GM6603-3.3TB3T
GM6603-5.0TA3T
GM6603-5.0TA3R
GM6603-5.0TC3T
GM6603-5.0TC3R
GM6603-5.0TB3T
Output Voltage
3.3
3.3
3.3
3.3
3.3
5.0
5.0
5.0
5.0
5.0
Package
TO-263-2
TO-263-2
TO-252
TO-252
TO-220
TO-263-2
TO-263-2
TO-252
TO-252
TO-220
Shipping
50 Units/ Tube
800 Units / Tape &Reel
80 Units / Tube
2,500 Units / Tape & Reel
50 Units / Tube
50 Units/ Tube
800 Units / Tape &Reel
80 Units / Tube
2,500 Units / Tape & Reel
50 Units / Tube
* For detail Ordering Number identification, please see last page.
GM6603
3
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Power Dissipation
Input Voltage
Operating Junction Temperature Range
Control Section
Power Transistor
Lead Temperature(Soldering, 10sec)
SYMBOL
P
D
V
IN
T
J
T
LEAD
T
STG
VALUE
Internally limited
15
UNIT
W
V
0 to 125
0 to 150
300
-65 to + 150
°C
°C
°C
Storage Temperature Range
BLOCK DIAGRAM
(Adjustable Version)
V
IN
Output
Current
Limit
Error
Amplifier
-
+
V
OUT
Thermal
Shutdown
Bandgap
Reference
ADJ
(Fixed Version)
V
IN
Output
Current
Limit
V
OUT
GM6603
Thermal
Shutdown
Bandgap
Reference
-
+
Error
Amplifier
GND
4
ELECTRICAL CHARACTERISTICS
(Typicals and limits appearing in normal type apply for T
J
= 25°C)
Parameter
Reference Voltage
GM6603-Adj
GM6603-1.8
GM6603-2.5
Output Voltage
GM6603-3.3
GM6603-5.0
GM6603-Adj
GM6603-1.8
Line Regulation
GM6603-2.5
GM6603-3.3
GM6603-5.0
GM6603-Adj
GM6603-1.8
Load Regulation
GM6603-2.5
GM6603-3.3
GM6603-5.0
Dropout Voltage
Current Limit
Minimum Load Current
GM6603-Adj
GM6603-1.8
GM6603-2.5
Quiescent Current
GM6603-3.3
GM6603-5.0
Adjust Pin Current
Temperature Coefficient
Ripple Rejection
GM6603-Adj
I
ADJ
T
C
R
A
I
Q
V
D
I
CL
I
O MIN
REG
LOAD
REG
LINE
V
O
Symbol
V
REF
Condition
I
OUT
=10mA, V
IN
-V
OUT
=1.5V
10mA I
OUT
3A, 3.3V V
IN
7V
I
OUT
=10mA, V
IN
=3.3V
10mA I
OUT
3A, 3.3V V
IN
7V
I
OUT
=10mA, V
IN
=4V
10mA I
OUT
3A, 4V V
IN
7V
I
OUT
=10mA, V
IN
=4.8V
10mA I
OUT
3A, 4.8V V
IN
7V
I
OUT
=10mA, V
IN
=6.5V
10mA
I
OUT
3A, 6.5V V
IN
7V
I
OUT
=10mA,
I
OUT
=10mA, 3.3V
I
OUT
=10mA, 4V
I
OUT
=10mA, 4.8V
I
OUT
=10mA, 6.5V
V
IN
V
IN
V
IN
V
IN
7V
7V
7V
7V
3A
Min
1.238
1.230
1.782
1.764
2.475
2.450
3.267
3.234
4.950
4.900
Typ
1.250
1.250
1.800
1.800
2.500
2.500
3.300
3.300
5.000
5.000
0.04
0.04
0.04
0.04
0.04
0.2
0.2
0.2
0.2
0.2
1.15
Max
1.262
1.270
1.818
1.836
2.525
2.550
3.333
3.366
5.050
5.100
0.20
0.20
0.20
0.20
0.20
0.40
0.40
0.40
0.40
0.40
1.3
Unit
V
V
V
V
V
%
V
IN
-V
OUT
=1.5V, 10mA I
O
V
IN
=3.8V, 10mA I
O
V
IN
=4.5V, 10mA I
O
V
IN
=5.3V, 10mA I
O
V
IN
=7V, 10mA I
O
3A
3A
3A
3A
%
I
OUT
=3A
V
IN
-V
OUT
=3V
V
IN
=5V
V
IN
=3.3V, 10mA I
O
V
IN
=4.0V, 10mA I
O
V
IN
=4.8V, 10mA I
O
V
IN
=6.5V, 10mA I
O
3A
3A
3A
3A
V
A
3
4
1.7
5
5
5
5
5
10
10
mA
mA
10
10
90
µA
%/°C
dB
I
OUT
=10mA, 2.65V
V
IN
7V
55
0.005
60
72
V
IN
-V
OUT
=1.5V, I
OUT
=10mA
V
IN
-V
OUT
=1.5V, I
OUT
=3A
GM6603
5
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