GM6603
3.0A PRECISION LINEAR REGULATORS
Power Management
Features
Description
Adjustable or Fixed Output
The GM6603 series of positive adjustable and fixed regulators are designed to provide 3.0A output with low dropout
voltage performance.
Output Current of 3.0A
Dropout Voltage (typical) 1.3V @ 3.0A
Typical Line Regulation 0.015%
On-chip trimming adjusts the reference voltage to 2.0%.
Typical Load Regulation 0.05%
Put them to work in post regulators or microprocessor
Fast Transient Response
power supplies where low voltage operation and fast tran-
Current Limit Protection
sient response are required.
Thermal Shutdown Protection
Device includes over-current protection and thermal shutdown protection as well.
Pin-to-pin compatible with the LT1085 family of regulators,
the GM6603's are available in TO-252, TO-220 and surface-mount TO-263 packages.
Application
Microprocessor Supply
Printer Supplies
Post Regulators for Switching Supplies
Motherboards
Telecommunication Systems
TYPICAL APPLICATION CIRCUITS
(Adjustable Version)
VOUT
VIN
ADJ
+
1
C1
10µF
Tant
VOUT= VREF X (1 +
VOUT= 3.45V
2
R1
133W
1.0%
R2
232W
1.0%
VIN> 4.75V
3
GM6603-3.3
VOUT 2
VIN
VOUT= 3.3V
GND
+
C2
10µF
Tant. Min
+
1
+
C1
10µF
Tant
C2
10µF
Tant. Min
Revision 1, Jun. 2004
GM6603-Adj
3
GM6603
VIN> 4.75V
(Fixed Version)
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
PRELIMINARY
1
GM6603
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
V V, V = Output Voltage(A =Adj ,33 = 3.3V)
A
= Assembly Location
Y
= Year
W W = Work Week
ADJ/GND*
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.
GM6603
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
GM6603
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VALUE
UNIT
Power Dissipation
PD
Internally limited
W
Input Voltage
VIN
7.0
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
ESD Damage Threshold
ESD
2.0
KV
BLOCK DIAGRAM
(Adjustable Version)
VOUT
VIN
Output
Current
Limit
Thermal
Shutdown
Bandgap
Reference
Error
Amplifier
-
+
ADJ
(Fixed Version)
VOUT
GM6603
VIN
4
Output
Current
Limit
Thermal
Shutdown
Bandgap
Reference
Error
Amplifier
-
+
GND
GM6603
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, 3.3V VIN 7V
IOUT=10mA, VIN=3.3V
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
IOUT=10mA, VIN-VOUT=1.5V
10mA IOUT 3A, 3.3V VIN 7V
IOUT=10mA, VIN=4V
GM6603-2.5
Output Voltage
Condition
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
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
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
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
TC
Thermal Regulation
RA
Unit
V
V
V
V
V
%
%
V
A
VIN=3.3V, 10mA IO
GM6603-1.8
Ripple Rejection
1.250
1.250
1.800
1.800
2.500
2.500
3.300
3.300
5.000
5.000
VIN
IOUT=3A
Temperature Coefficient
Max
1.238
1.230
1.782
1.764
2.475
2.450
3.267
3.234
4.950
4.900
IOUT=10mA, 4.8V
VD
Adjust Pin Current
VIN
Typ
GM6603-3.3
Dropout Voltage
Minimum Load Current
VIN
Min
mA
mA
IOUT=10mA, 2.65V
VIN
7V
µA
VIN-VOUT=1.5V, IOUT=10mA
0.005
%/°C
TA=25°C, 30ms pulse
0.003
%/W
72
dB
VIN-VOUT=1.5V, IOUT=3A
60
GM6603
Parameter
5
GM6603
APPLICATION INFORMATION
The GM6603 series linear regulators provide fixed and
adjustable output voltages at currents up to 3.0A.
These regulators are protected against overcurrent conditions and include thermal shutdown protection. The
GM6603's have 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 fol-
of capacitor, output voltage and rate at which VIN
lows.
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 best. A 22µF tantalum capacitor will
work fine in most applications, but with high current regulators such as the 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
given by:
R2
DV = DI x ESD
GM6603
In the GM6603 linear regulators, the discharge path
6
In microprocessor applications an output capacitor network of several tantalum and ceramic capacitors in parallel is commonly used. This reduces overall ESR and
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
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.
GM6603
Output Voltage Sensing
The GM6603 series are three terminal regulators, 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
the GM6603 should be connected as shown in Figure
2.
VIN
VOUT
VIN
RC
Conductor
Parasitic
Resistance
The thermal characteristics of an IC depend 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
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
The GM6603 series precision linear regulators include
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
thermal shutdown and current limit circuitry to protect
the 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 the
GM6603, so electrical isolation may be required for
some applications. Thermal compound should always
be used with high current regulators like the 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
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 the GM6603 the majority of
the heat is generated in the power transistor section.
GM6603
ADJ
7
GM6603
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
101
102
103
104
105
Frequency(Hz)
GM6603
Figure 5. Ripple Rejection vs. Frequency
8
106
0.40
1
2
3
4
5
6
7
VIN - VOUT(V)
Figure 6. Minimum Load Current vs.
VIN - VOUT(V)
8
GM6603
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
P
1.27 ± 0.10
0.80 ± 0.10
1.52 ± 0.10
2.54 TYP
(2.54 ± 0.20)
3°
0.9
7.0
3°
45°
3.00
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
3°
3-R0.2
+0.1
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°
1.20
Pad Layout
3°
1.50 DP0.20
0.63
17.02
0.33
8.38
9.20 ± 0.20
P
15.3 ± 0.20
1.4 ± 0.20
0.10 ± 0.01
3°
3°
R0.30
2.40 ± 0.20
2.00 ± 0.10
4.90 ± 0.20
0.90 ± 0.10
1.27 ± 0.10
2.54 TYP
(2.54 ± 0.20)
0.42
10.66
3°
0.24
6.096
2.54 ± 0.10
0.75
R0.30
+0.1
0.50 -0.05
0.04
1.016
10.0 ± 0.20
7.0
4.0
0.40
3°
0.12
3.05
(
0.90
R 0.3
R 0.45
7.2
9.20 ± 0.20
10.00 ± 0.20
Inches
)
mm
GM6603
0.40
9
4.90 ± 0.20
Unit: mm
GM6603
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
6.10 ± 0.05
7.20 ± 0.05
G
7°
0.75 ± 0.10
0.89 ± 0.05
R 0.25 ± 0.13
0.81 ± 0.038
R0.15 max
0.244
6.20
0.118
3.0
0.070 ± 0.05
9.900
7°
0.75 ± 0.10
2.70 ± 0.10
0.243
6.172
0.228
5.80
1.525 ± 0.10
0.101
2.58
0.063
1.6
(
Inches
)
mm
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