Features
Description
GM6603 of positive adjustable and fixed regulators are de-
Adjustable or Fixed Output
signed to provide 3.0A output with low dropout voltage per-
Output Current of 3.0A
formance.
Dropout Voltage (typical) 1.15V @ 3.0A
On-chip trimming adjusts the reference voltage to 2.0%. To
Typical Line Regulation 0.04%
work in post regulators or microprocessor power supplies
Typical Load Regulation 0.2%
where low voltage operation and fast transient response
Fast Transient Response
are required.
Current Limit Protection
Device includes over-current protection and thermal shut-
Thermal Shutdown Protection
down protection as well.
Pin-to-pin compatible with LT1085 family of regulators,
GM6603 is available in TO-252, TO-220, and surfacemount TO-263 packages.
Application
Microprocessor Supply
Printer Supplies
Post Regulators for Switching Supplies
Motherboards
Telecommunication Systems
TYPICAL APPLICATION CIRCUITS
(Adjustable Version)
3
ADJ
+
VOUT= 3.45V
VOUT 2
VIN
1
C1
10µF
Tant
VOUT= VREF X (1 +
R1
133W
1.0%
R2
232W
1.0%
VIN> 4.75V
3
VIN
GM6603-3.3
VOUT 2
VOUT= 3.3V
GND
+
C2
10µF
Tant. Min
+
1
C1
10µF
Tant
+
C2
10µF
Tant. Min
GM6603 V0.1
VIN> 4.75V
(Fixed Version)
GM6603-Adj
R2
) + IADJ X R2
R1
Notes:
1. C1 needed if device is far from filter capacitors
2. C2 minimum value required for stability
www.gammamicro.com
1
MARKING INFORMATION & PIN CONFIGURATIONS(Top View)
2
TO-252(DPAK)
TO-263-2 (D PAK)
TO-220
GM6603
VVAYWW
GM6603
VVAYWW
GM6603
VVAYWW
VIN
VOUT
ADJ/GND*
VIN
VOUT
ADJ/GND*
VIN
VOUT
ADJ/GND*
V V, V = Output Voltage(A =Adj ,33 = 3.3V)
A
= Assembly Location
Y
= Year
W W = Weekly
On fixed versions Pin 1 = GND,
on adjustable versions Pin 1 = ADJ
Tab = VOUT
ORDERING INFORMATION
Output Voltage
Package
Shipping
GM6603-ATA3T
Adj
TO-263-2
50 Units/ Tube
GM6603-ATA3R
Adj
TO-263-2
800 Units / Tape &Reel
GM6603-ATC3T
Adj
TO-252
80 Units / Tube
GM6603-ATC3R
Adj
TO-252
2,500 Units / Tape & Reel
GM6603-ATB3T
Adj
TO-220
50 Units / Tube
GM6603-1.5TA3T
1.5
TO-263-2
50 Units/ Tube
GM6603-1.5TA3R
1.5
TO-263-2
800 Units / Tape &Reel
GM6603-1.5TB3T
1.5
TO-220
50 Units / Tube
GM6603-1.8TA3T
1.8
TO-263-2
50 Units/ Tube
GM6603-1.8TA3R
1.8
TO-263-2
800 Units / Tape &Reel
GM6603-1.8TC3T
1.8
TO-252
80 Units / Tube
GM6603-1.8TC3R
1.8
TO-252
2,500 Units / Tape & Reel
GM6603-1.8TB3T
1.8
TO-220
50 Units / Tube
GM6603-2.5TA3T
2.5
TO-263-2
50 Units/ Tube
GM6603-2.5TA3R
2.5
TO-263-2
800 Units / Tape &Reel
GM6603-2.5TB3T
2.5
TO-220
50 Units / Tube
GM6603-2.85TA3T
2.85
TO-263-2
50 Units/ Tube
GM6603-2.85TA3R
2.85
TO-263-2
800 Units / Tape &Reel
GM6603-2.85TB3T
2.85
TO-220
50 Units / Tube
GM6603-3.0TA3T
3.0
TO-263-2
50 Units/ Tube
GM6603-3.0TA3R
3.0
TO-263-2
800 Units / Tape &Reel
GM6603-3.0TC3T
3.0
TO-252
80 Units / Tube
GM6603-3.0TC3R
3.0
TO-252
2,500 Units / Tape & Reel
GM6603-3.0TB3T
3.0
TO-220
50 Units / Tube
GM6603
Ordering Number
2
* For detail Ordering Number identification, please see last page.
ORDERING INFORMATION (Continued)
Output Voltage
Package
Shipping
GM6603-3.3TA3T
3.3
TO-263-2
50 Units/ Tube
GM6603-3.3TA3R
3.3
TO-263-2
800 Units / Tape &Reel
GM6603-3.3TC3T
3.3
TO-252
80 Units / Tube
GM6603-3.3TC3R
3.3
TO-252
2,500 Units / Tape & Reel
GM6603-3.3TB3T
3.3
TO-220
50 Units / Tube
GM6603-5.0TA3T
5.0
TO-263-2
50 Units/ Tube
GM6603-5.0TA3R
5.0
TO-263-2
800 Units / Tape &Reel
GM6603-5.0TC3T
5.0
TO-252
80 Units / Tube
GM6603-5.0TC3R
5.0
TO-252
2,500 Units / Tape & Reel
GM6603-5.0TB3T
5.0
TO-220
50 Units / Tube
Ordering Number
GM6603
* For detail Ordering Number identification, please see last page.
3
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VALUE
UNIT
Power Dissipation
PD
Internally limited
W
Input Voltage
VIN
15
V
Operating Junction Temperature Range
Control Section
Power Transistor
TJ
0 to 125
0 to 150
°C
Lead Temperature(Soldering, 10sec)
TLEAD
300
°C
Storage Temperature Range
TSTG
-65 to + 150
°C
BLOCK DIAGRAM
(Adjustable Version)
VOUT
VIN
Output
Current
Limit
Error
Amplifier
Thermal
Shutdown
-
Bandgap
Reference
+
ADJ
(Fixed Version)
VOUT
GM6603
VIN
4
Output
Current
Limit
Thermal
Shutdown
Bandgap
Reference
Error
Amplifier
-
+
GND
ELECTRICAL CHARACTERISTICS
(Typicals and limits appearing in normal type apply for TJ = 25°C)
Symbol
Reference Voltage
GM6603-Adj
VREF
GM6603-1.8
VO
GM6603-3.3
Load Regulation
10mA IOUT 3A, 4V VIN 7V
IOUT=10mA, VIN=4.8V
10mA IOUT 3A, 4.8V VIN 7V
IOUT=10mA, VIN=6.5V
GM6603-5.0
Line Regulation
10mA IOUT 3A, 3.3V VIN 7V
IOUT=10mA, VIN=3.3V
10mA IOUT 3A, 3.3V VIN 7V
IOUT=10mA, VIN=4V
GM6603-2.5
Output Voltage
Condition
IOUT=10mA, VIN-VOUT=1.5V
10mA
IOUT 3A, 6.5V VIN 7V
GM6603-Adj
IOUT=10mA,
GM6603-1.8
IOUT=10mA, 3.3V
GM6603-2.5
REGLINE
IOUT=10mA, 4V
Max
1.238
1.230
1.782
1.764
2.475
2.450
3.267
3.234
4.950
4.900
1.250
1.250
1.800
1.800
2.500
2.500
3.300
3.300
5.000
5.000
1.262
1.270
1.818
1.836
2.525
2.550
3.333
3.366
5.050
5.100
0.04
0.20
0.04
0.20
0.04
0.20
7V
7V
IOUT=10mA, 4.8V
VIN
7V
0.04
0.20
GM6603-5.0
IOUT=10mA, 6.5V
VIN
7V
0.04
0.20
GM6603-Adj
VIN-VOUT=1.5V, 10mA IO
0.2
0.40
GM6603-1.8
VIN=3.8V, 10mA IO
3A
0.2
0.40
VIN=4.5V, 10mA IO
3A
0.2
0.40
GM6603-3.3
VIN=5.3V, 10mA IO
3A
0.2
0.40
GM6603-5.0
VIN=7V, 10mA IO
0.2
0.40
1.15
1.3
GM6603-2.5
REGLOAD
VD
IOUT=3A
Current Limit
ICL
VIN-VOUT=3V
GM6603-Adj
IO MIN
3A
3A
3
VIN=5V
4
1.7
5
3A
5
10
VIN=4.0V, 10mA IO
3A
5
10
GM6603-3.3
VIN=4.8V, 10mA IO
3A
5
10
GM6603-5.0
VIN=6.5V, 10mA IO
3A
5
10
55
90
GM6603-2.5
Quiescent Current
GM6603-Adj
IQ
IADJ
Unit
V
V
V
V
V
%
%
V
A
VIN=3.3V, 10mA IO
GM6603-1.8
Adjust Pin Current
VIN
Typ
GM6603-3.3
Dropout Voltage
Minimum Load Current
VIN
Min
mA
mA
IOUT=10mA, 2.65V
VIN
7V
Temperature Coefficient
TC
VIN-VOUT=1.5V, IOUT=10mA
Ripple Rejection
RA
VIN-VOUT=1.5V, IOUT=3A
60
µA
0.005
%/°C
72
dB
GM6603
Parameter
5
APPLICATION INFORMATION
GM6603 series linear regulators provide fixed and adjustable output voltages at currents up to 3.0A. These
regulators are protected against over current conditions and include thermal shutdown protection.
GM6603 has a composite PNP-PN output transistor
and require an output capacitor for stability.
Protection Diodes
When large external capacitors are used with most
linear regulator, it is wise to add protection diodes. If
the input voltage of the regulator is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value
A detailed procedure for selecting this capacitor is as
of capacitor, output voltage, and rate at which VIN
followed.
drops.
Stability Considerations
The output compensation capacitor helps to determine
FIGURE 1
(a),(b)
. Protection Diode Scheme for
Large Output Capacitors
(a) Fixed Version
three main characteristics of a linear regulator's performance: start-up delay, load transient response, and
loop stability. The capacitor value and type is based on
cost, availability, size, and temperature constraints. A
tantalum or aluminum electrolytic capacitor is pre-
IN4002
VIN
VIN
GM6603-3.3
ferred, as a film or ceramic capacitor with almost zero
ESR can cause instability. An aluminum electrolytic ca-
VOUT
VOUT
GND
C1
C2
pacitor is the least expensive type. But when the circuit
operates at low temperatures, both the value and ESR
of the capacitor will vary widely. For optimum performance over the full operating temperature range, a tan-
(b) Adjustable Version
talum capacitor is the best. A 22µF tantalum capacitor
will work fine in most applications. But with high current
regulators, such as GM6603 higher capacitance values
IN4002
VIN
will improve the transient response and stability. Most
applications for the GM6603's involve large changes in
VOUT
VOUT
VIN
GM6603-Adj
C1
ADJ
R1
C2
load current, so the output capacitor must supply instantaneous load current. The ESR of the output ca-
CADJ
pacitor causes an immediate drop in output voltage
R2
given by:
DV = DI x ESD
In microprocessor applications an output capacitor network of several tantalum and ceramic capacitors in par-
GM6603
allel is commonly used. This reduces overall ESR and
6
minimizes the instantaneous output voltage drop under
transient load conditions. The output capacitor network
should be placed as close to the load as possible for
the best results.
In GM6603 linear regulators, the discharge path is
through a large junction, and protection diodes are
normally not needed. However, if the regulator is
used with large output capacitance values and the input voltage is instantaneously shorted to ground,
damage can occur. In this case, a diode connected
as shown above in Figure 1.
Output Voltage Sensing
GM6603 series is three terminal regulator, so they cannot provide true remote load sensing. Load regulation
is limited by the resistance of the conductors connecting the regulator to the load. For best results, GM6603
should be connected as shown in Figure 2.
VIN
VOUT
VIN
RC
Conductor
Parasitic
Resistance
The thermal characteristics of an IC depend on four
factors:
1. Maximum Ambient Temperature TA (°C)
2. Power Dissipation PD (Watts)
3. Maximum Junction Temperature TJ (°C)
4. Thermal Resistance Junction to ambient RQJA
(°C/W)
These relationship of these four factors is expressed
by equation (1):
TJ = TA + PD X RQJA
GM6603-3.3
RLOAD
GND
(a) Fixed Version
VIN
VIN
VOUT
RC
Conductor
Parasitic
Resistance
Maximum ambient temperature and power dissipation are determined by the design while the maximum junction temperature and thermal resistance
depend on the manufacturer and the package type.
The maximum power dissipation for a regulator is expressed by equation (2):
PD(max)={VIN(max)-VOUT(min)} IOUT(max) + VIN(max)IQ
GM6603-A
ADJ
R1
RLOAD
R2
(b) Adjustable Version
(a),(b)
FIGURE 2
Conductor Parasitic Resistance Effects are
Minimized by this Grounding Scheme For Fixed
and Adjustable Output Regulators
Calculating Power Dissipation and Heat
Sink Requirements
GM6603 series precision linear regulators include thermal shutdown and current limit circuitry to protect the
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current
IQ is the maximum quiescent current at IOUT(max).
A heat sink effectively increases the surface area of
the package to improve the flow of heat away from
the IC into the air. Each material in the heat flow
path between the IC and the environment has a thermal resistance. Like series electrical resistances,
these resistances are summed to determine RQJA,
the total thermal resistance between the junction
and the air. This is expressed by equation (3):
RQJA = RQJC + RQ CS + RQSA
devices. However, high power regulators normally operate at high junction temperatures so it is important to
calculate the power dissipation and junction temperatures accurately to be sure that you use and adequate
heat sink. The case is connected to VOUT on GM6603
Where all of the following are in °C/W:
RQJC is thermal resistance of junction to case,
RQCS is thermal resistance of case to heat sink,
RQSA is thermal resistance of heat sink to ambient
air
so electrical isolation may be required for some appliwith high current regulators like the GM6603.
The value for RQJA is calculated using equation (3)
and the result can be substituted in equation (1).
The value for RQJC is 3.5°C/W for a given package
type based on an average die size. For a high current regulator such as GM6603, the majority of the
heat is generated in the power transistor section.
GM6603
cations. Thermal compound should always be used
7
Typical Performance Characteristics
+0.3
1.20
TCASE= 0°C
1.10
Dropout Voltage(V)
Reference Voltage Deviation(%)
1.15
1.05
TCASE= 25°C
1.00
0.95
0.90
TCASE= 125°C
0.85
0.80
0.75
+0.2
+0.1
0
-0.1
-0.2
-0.3
0 0.30 0.60 0.90 1.20 1.50 1.80 2.10 2.40 2.70 300
0
30
60
Qutput Current(A)
90
Figure 4. Bandgap Reference Voltage Deviation
vs. Temperature
Figure 3. Dropout Voltage vs. Output Current
90
0.65
Minimum Load Current(mA)
80
70
Ripple Rejection(dB)
120
TJ°C
60
50
40
30
TCASE= 0°C
0.60
TCASE= 25°C
0.55
TCASE= 125°C
0.50
0.45
20
10
1
10
2
10
3
10
4
10
5
10
Frequency(Hz)
GM6603
Figure 5. Ripple Rejection vs. Frequency
8
6
10
0.40
1
2
3
4
5
6
7
VIN - VOUT(V)
Figure 6. Minimum Load Current vs.
VIN - VOUT(V)
8
TO-220 PACKAGE OUTLINE DIMENSIONS
4.50 ± 0.20
9.90 ± 0.20
3.60 ± 0.20
8.0
8.70
2.80 ± 0.10
7.0
+0.1
1.30 -0.05
4.60
8.40
3°
45°
3.00
1.27 ± 0.10
3°
3°
3-R0.2
+0.1
0.80 ± 0.10
1.52 ± 0.10
2.54 TYP
(2.54 ± 0.20)
0.9
7.0
10.08 ± 0.30
13.08 ± 0.20
1.46
1.00
3°
18.95 MAX
3.70 ± 0.20
15.90 ± 0.20
1.50 DP0.20
9.20 ± 0.20
1.30 ± 0.10
1.70
0.50 -0.05
2.40 ± 0.20
3°
2 - R 0.3
Unit: mm
10.00 ± 0.20
TO-263-2 PACKAGE OUTLINE DIMENSIONS
9.90 ± 0.20
4.50 ± 0.20
+0.1
1.30 -0.05
15°
0.40
Pad Layout
1.20
3°
0.63
17.02
0.33
8.38
1.50 DP0.20
9.20 ± 0.20
15.3 ± 0.20
0.10 ± 0.01
3°
3°
R0.30
2.40 ± 0.20
2.00 ± 0.10
4.90 ± 0.20
1.27 ± 0.10
2.54 TYP
(2.54 ± 0.20)
0.24
6.096
2.54 ± 0.10
0.75
R0.30
0.90 ± 0.10
0.42
10.66
+0.1
0.50 -0.05
0.04
1.016
10.0 ± 0.20
7.0
4.0
0.40
3°
(
0.90
R 0.3
R 0.45
7.2
9.20 ± 0.20
10.00 ± 0.20
4.90 ± 0.20
Inches
)
mm
GM6603
1.4 ± 0.20
3°
0.12
3.05
9
Unit: mm
TO-252 PACKAGE OUTLINE DIMENSIONS
6.50 ± 0.05
2.30 ± 0.05
5.340 ± 0.05
0.508 ± 0.0127
29° ± 0.5°
REF 0.6
Pad Layout
7°
1.0 ± 0.05
0.244
6.20
6.10 ± 0.05
0.118
3.0
0.070 ± 0.05
7.20 ± 0.05
9.900
7°
7°
0.75 ± 0.10
0.75 ± 0.10
2.70 ± 0.10
0.89 ± 0.05
R 0.25 ± 0.13
0.243
6.172
0.228
5.80
1.525 ± 0.10
0.81 ± 0.038
0.101
2.58
0.063
1.6
(
R0.15 max
Unit: mm
2°
ORDERING NUMBER
GM 6603 1.8 TB3 T
Gamma Micro.
Shipping
T: Tube
R: Tape & Reel
GM6603
Circuit Type
10
Output Voltage
A: Adj, 1.5: 1.5V
1.8: 1.8V, 2.5: 2.5V
2.85: 2.85V, 3.0: 3.0V
3.3: 3.3V, 5.0: 5.0V
Package
TA3: TO-263-2
TB3: TO-220
TC3: TO-252
Inches
)
mm
11
GM6603