Gamma GM6605-2.5TB3T 5.0a low dropout precision linear regulator Datasheet

Features
Description
GM6605 series of positive adjustable and fixed regulators
Adjustable or Fixed Output
is designed to provide 5A output with low dropout voltage
Output Current of 5.0A
performance. On-chip trimming adjusts the reference volt-
Dropout Voltage (typical) 1.15V @ 5.0A
age with an accuracy of ±1% for adjustable, and ±2% for
Typical Line Regulation 0.04%
fixed voltage versions. To work in post regulators or micro-
Typical Load Regulation 0.08%
processor power supplies, which where low voltage opera-
Fast Transient Response
tion and fast transient response are required. Device in-
Current Limit Protection
cludes over-current protection and thermal shutdown pro-
Thermal Shutdown Protection
tection as well.
GM6605 is available in TO-220 and surface-mount TO-263
packages.
Application
Microprocessor Supply
Medical Equipment
Post Regulators for Switching Supplies
Printer Supplies
Telecommunication Systems
Motherboards
TYPICAL APPLICATION CIRCUITS
GM6605-Adj
[email protected]
5.0V
10µF
5.0V
0.1µF
5.0V
5.0V
124W
1.0%
ADJ
VOUT
VIN
VOUT
200W
1.0%
(Adjustable Version)
GM6605-3.3
[email protected]
GND
22µF
5.0V
22µF
5.0V
10µF
5.0V
(Fixed Version)
www.gammamicro.com
GM6605 V0.11
VIN
1
MARKING INFORMATION & PIN CONFIGURATIONS (Top View)
TO-252 (DPAK)
2
TO-220
GM6605
VVAYWW
TO-263-2 (D PAK)
GM6605
GM6605
VVAYWW
VVAYWW
VIN
VOUT
VIN
VOUT
GND*
VIN
VOUT
GND*
GND*
V V = Output Voltage (50 = 5.0V, A =Adj )
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
GM6605-ATA3T
Adj
TO-263-2
50 Units / Tube
GM6605-ATA3R
Adj
TO-263-2
GM6605-ATB3T
Adj
TO-220
50 Units / Tube
GM6605-1.8TA3T
1.8
TO-263-2
50 Units / Tube
GM6605-1.8TA3R
1.8
TO-263-2
800 Units / Tape & Reel
GM6605-1.8TB3T
1.8
TO-220
50 Units / Tube
GM6605-2.5TA3T
2.5
TO-263-2
50 Units / Tube
GM6605-2.5TA3R
2.5
TO-263-2
800 Units / Tape & Reel
GM6605-2.5TB3T
2.5
TO-220
GM6605-3.3TA3T
3.3
TO-263-2
50 Units / Tube
800 Units / Tape & Reel
GM6605
Ordering Number
2
GM6605-3.3TA3R
3.3
TO-263-2
GM6605-3.3TB3T
3.3
TO-220
GM6605-3.3TC3T
3.3
TO-252
800 Units / Tape & Reel
50 Units / Tube
50 Units / Tube
80 Units / Tube
2,500 Units / Tape & Reel
GM6605-3.3TC3R
3.3
TO-252
GM6605-5.0TA3T
5.0
TO-263-2
50 Units / Tube
GM6605-5.0TA3R
5.0
TO-263-2
800 Units / Tape & Reel
GM6605-5.0TB3T
5.0
TO-220
* For detail Ordering Number identification, please see last page.
50 Units / Tube
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VALUE
UNIT
Power Dissipation
PD
Internally limited
W
Input Voltage
VIN
15
V
Junction Temperature
TJ
+150
°C
TLEAD
300
°C
TJ
0 to + 125
°C
TSTG
-65 to + 150
°C
Lead Temperature(Soldering, 10sec)
Operating Junction Temperature Range
Storage Temperature Range
BLOCK DIAGRAM
(Fixed Version)
VOUT
VIN
Thermal
Shutdown
Error
Amplifier
-
Output
Current
Limit
+
Bandgap
Reference
GND
(Adjustable Version)
VOUT
VIN
Error
Amplifier
-
Bandgap
Reference
+
ADJ
GM6605
Thermal
Shutdown
Output
Current
Limit
3
ELECTRICAL CHARACTERISTICS
(Typicals and limits appearing in normal type apply for TJ = 25°C)
Symbol
Parameter
Reference Voltage
GM6605-Adj
VREF
GM6605-1.8
VO
GM6605-3.3
Load Regulation
10mA
GM6605-Adj
IOUT=10mA,
GM6605-1.8
IOUT=10mA, 3.3V
GM6605-2.5
REGLINE
IOUT=10mA, 4V
Max
1.238
1.230
1.782
1.764
2.475
2.460
3.267
3.247
4.950
4.920
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
2.540
3.333
3.353
5.050
5.080
0.04
0.20
0.04
0.20
0.04
0.20
0.04
0.20
0.04
0.20
0.08
0.40
7V
7V
GM6605-3.3
7V
GM6605-5.0
IOUT=10mA, 6.5V
VIN
7V
GM6605-Adj
VIN-VOUT=1.5V, 10mA IO
GM6605-1.8
VIN=3.8V, 10mA IO
5A
0.08
0.40
VIN=4.5V, 10mA IO
5A
0.08
0.40
GM6605-3.3
VIN=5.3V, 10mA IO
5A
0.08
0.40
GM6605-5.0
VIN=7V, 10mA IO
0.08
0.40
1.15
1.3
GM6605-2.5
REGLOAD
IOUT=5A
Current Limit
ICL
VIN-VOUT=3V
GM6605-Adj
IO MIN
5A
5A
5.5
VIN=5V
6.8
5
10
5A
5
10
VIN=4.0V, 10mA IO
5A
5
10
GM6605-3.3
VIN=4.8V, 10mA IO
5A
5
10
GM6605-5.0
VIN=6.5V, 10mA IO
5A
5
10
50
120
GM6605-2.5
GM6605-Adj
IQ
IADJ
RA
V
V
V
V
V
%
%
V
mA
mA
IOUT=10mA, 2.75V
VIN
7V
VIN-VOUT=1.5V, IOUT=10mA
Temperature Coefficient
Unit
A
VIN=3.3V, 10mA IO
Quiescent Current
Ripple Rejection
VIN
Typ
VIN
VD
Adjust Pin Current
VIN
Min
IOUT=10mA, 4.8V
GM6605-1.8
GM6605
IOUT 5A, 6.5V VIN 7V
Dropout Voltage
Minimum Load Current
4
10mA IOUT 5A, 4V VIN 7V
IOUT=10mA, VIN=4.8V
10mA IOUT 5A, 4.8V VIN 7V
IOUT=10mA, VIN=6.5V
GM6605-5.0
Line Regulation
10mA IOUT 5A, 3.3V VIN 7V
IOUT=10mA, VIN=3.3V
10mA IOUT 5A, 3.3V VIN 7V
IOUT=10mA, VIN=4V
GM6605-2.5
Output Voltage
Condition
IOUT=10mA, VIN-VOUT=1.5V
VIN-VOUT=1.5V, IOUT=5A
60
µA
0.005
%/°C
80
dB
APPLICATION INFORMATION
GM6605 series linear regulators provide fixed and adjustable output voltages at currents up to 5.0A. These
regulators are protected against over-current conditions and include thermal shutdown protection. The
GM6605 has a composite PNP-NPN 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.
Figure 1
Stability Considerations
The output compensation capacitor helps to determine
(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
IN4002
VIN
VIN
VOUT
VOUT
GM6605-3.3
tantalum or aluminum electrolytic capacitor is preferred, as a film or ceramic capacitor with almost zero
GND
C1
C2
ESR can cause instability. An aluminum electrolytic capacitor 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 perfor-
(b) Adjustable Version
mance over the full operating temperature range, a tantalum capacitor is the best. A 22µF tantalum capacitor
will work fine in most applications. But with high current
VIN
VIN
regulators, such as GM6605 higher capacitance values
current, so the output capacitor must supply instantaneous load current. The ESR of the output capacitor
VOUT
GM6605-Adj
will improve the transient response and stability. Most
applications for Gm6605 involve large changes in load
IN4002
VOUT
C1
ADJ
R1
CADJ
C2
R2
causes an immediate drop in output voltage given by:
work 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
the best results.
In GM6605 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.
GM6605
DV = DI x ESD
In microprocessor applications an output capacitor net-
5
Output Voltage Sensing
GM6605 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, Gm6605
should be connected as shown in Figure 2.
VIN
VIN
VOUT
RC
Conductor
Parasitic
Resistance
GM6605-3.3
RLOAD
GND
(a) Fixed Version
VIN
VIN
VOUT
RC
Conductor
Parasitic
Resistance
GM6605-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
GM6605 series precision linear regulators include 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 GM6605.
so electrical isolation may be required for some applications. Thermal compound should always be used
GM6605
with high current regulators like GM6605.
6
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 ........(1)
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 ........(2)
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 re-
,
sistance 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+ R QSA ........(3)
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 GM6605, the majority of the heat is
generated in the power transistor section.
Typical Performance Characteristics
+0.3
1.20
TCASE= 0°C
1.10
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)
Figure 5. Ripple Rejection vs. Frequency
106
0.40
1
2
3
4
5
6
7
8
VIN - VOUT(V)
Figure 6. Minimum Load Current vs.
VIN - VOUT(V)
GM6605
Dropout Voltage(V)
Reference Voltage Deviation(%)
1.15
7
TO-252 PACKAGE OUTLINE DIMENSIONS
6.50 ± 0.05
Pad Layout
2.30 ± 0.05
5.340 ± 0.05
0.508 ± 0.0127
29° ± 0.5°
REF 0.6
0.244
6.20
7°
0.118
3.0
1.0 ± 0.05
6.10 ± 0.05
0.070 ± 0.05
7.20 ± 0.05
9.900
7°
7°
0.75 ± 0.10
0.243
6.172
0.228
5.80
0.75 ± 0.10
2.70 ± 0.10
0.89 ± 0.05
0.063
1.6
1.525 ± 0.10
R 0.25 ± 0.13
0.101
2.58
0.81 ± 0.038
(
Inches
)
mm
Unit: mm
R0.15 max
2°
TO-263-2 PACKAGE OUTLINE DIMENSIONS
9.90 ± 0.20
4.50 ± 0.20
+0.1
1.30 -0.05
15°
0.40
1.20
Pad Layout
3°
1.50 DP0.20
0.63
17.02
0.33
8.38
9.20 ± 0.20
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
1.27 ± 0.10
GM6605
2.54 TYP
(2.54 ± 0.20)
8
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°
3°
0.24
6.096
2.54 ± 0.10
0.75
R0.30
0.90 ± 0.10
0.12
3.05
(
0.90
R 0.3
R 0.45
7.2
9.20 ± 0.20
10.00 ± 0.20
4.90 ± 0.20
Unit: mm
Inches
)
mm
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
1.27 ± 0.10
2.54 TYP
(2.54 ± 0.20)
3°
3°
0.9
7.0
3°
45°
3.00
10.08 ± 0.30
13.08 ± 0.20
1.46
1.00
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
0.80 ± 0.10
1.52 ± 0.10
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
ORDERING NUMBER
GM 6605 1.8 TB3 T
Gamma Micro.
Shipping
T: Tube
R: Tape & Reel
Output Voltage
A: Adj, 1.5: 1.5V
1.8: 1.8V, 2.5: 2.5V
3.3: 3.3V, 5.0: 5.0V
Package
TA3: TO-263-2
TB3: TO-220
TC3: TO-252
GM6605
Circuit Type
9
10
GM6605
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