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Description
GM6603 of positive adjustable and fixed regulators are designed to provide 3.0A output with low dropout voltage performance. 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 shutdown 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.
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)
VIN> 4.75V
GM6603-Adj
3
VIN
ADJ
VOUT 2
R1 133W 1.0% R2 232W 1.0%
VOUT= 3.45V
VIN> 4.75V
3
VIN
GM6603-3.3 VOUT 2
GND
VOUT= 3.3V
+
1 C1 10F Tant
+
C2 10F Tant. Min
+
1 C1 10F Tant
+
C2 10F Tant. Min
VOUT= VREF X (1 +
R2 ) + IADJ X R2 R1
Notes: 1. C1 needed if device is far from filter capacitors 2. C2 minimum value required for stability
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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
VIN VOUT ADJ/GND* VIN VOUT
V V, V = Output Voltage(A =Adj ,33 = 3.3V) A = Assembly Location Y = Year W W = Weekly ADJ/GND*
VIN VOUT
ADJ/GND*
On fixed versions Pin 1 = GND, on adjustable versions Pin 1 = ADJ Tab = VOUT
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
PD VIN TJ TLEAD TSTG
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) VIN Output Current Limit Error Amplifier +
VOUT
Thermal Shutdown Bandgap Reference
ADJ
(Fixed Version) VIN Output Current Limit
VOUT
GM6603
Thermal Shutdown Bandgap Reference +
Error Amplifier
GND
4
ELECTRICAL CHARACTERISTICS
(Typicals and limits appearing in normal type apply for TJ = 25C) 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 IADJ TC RA IQ VD ICL IO MIN REGLOAD REGLINE VO
Symbol
VREF
Condition
IOUT=10mA, VIN-VOUT=1.5V 10mA IOUT 3A, 3.3V VIN 7V IOUT=10mA, VIN=3.3V 10mA IOUT 3A, 3.3V VIN 7V IOUT=10mA, VIN=4V 10mA IOUT 3A, 4V VIN 7V IOUT=10mA, VIN=4.8V 10mA IOUT 3A, 4.8V VIN 7V IOUT=10mA, VIN=6.5V 10mA IOUT 3A, 6.5V VIN 7V IOUT=10mA, IOUT=10mA, 3.3V IOUT=10mA, 4V IOUT=10mA, 4.8V IOUT=10mA, 6.5V VIN VIN VIN VIN 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
%
VIN-VOUT=1.5V, 10mA IO VIN=3.8V, 10mA IO VIN=4.5V, 10mA IO VIN=5.3V, 10mA IO VIN=7V, 10mA IO 3A 3A 3A 3A
%
IOUT=3A VIN-VOUT=3V VIN=5V
VIN=3.3V, 10mA IO VIN=4.0V, 10mA IO VIN=4.8V, 10mA IO VIN=6.5V, 10mA IO 3A 3A 3A 3A
V A
3
4 1.7 5 5 5 5 5 10 10
mA
mA 10 10 90 A %/C dB
IOUT=10mA, 2.65V
VIN
7V
55 0.005 60 72
VIN-VOUT=1.5V, IOUT=10mA VIN-VOUT=1.5V, IOUT=3A
GM6603
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. A detailed procedure for selecting this capacitor is as followed. 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 of capacitor, output voltage, and rate at which VIN drops.
FIGURE 1 . Protection Diode Scheme for Large Output Capacitors
(a),(b)
Stability Considerations
The output compensation capacitor helps to determine 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 preferred, as a film or ceramic capacitor with almost zero 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 performance over the full operating temperature range, a tantalum capacitor is the best. A 22F tantalum capacitor will work fine in most applications. But with high current regulators, such as GM6603 higher capacitance values will improve the transient response and stability. Most applications for the GM6603's involve large changes in load current, so the output capacitor must supply instantaneous load current. The ESR of the output capacitor causes an immediate drop in output voltage given by:
VIN
(a) Fixed Version
IN4002 VIN VOUT VOUT
GM6603-3.3
C1 GND C2
(b) Adjustable Version
IN4002 VIN VOUT VIN GM6603-Adj C1 ADJ R1 CADJ VOUT C2
R2
DV = DI x ESD
In microprocessor applications an output capacitor network of several tantalum and ceramic capacitors in parallel is commonly used. This reduces overall ESR and
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.
GM6603
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.
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.
Conductor Parasitic Resistance RLOAD
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):
VIN
VIN
VOUT
RC
TJ = TA + PD X RQJA
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 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 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 3.5C/W for a given package
GM6603-3.3 GND (a) Fixed Version
VIN
VIN ADJ
VOUT GM6603-A
RC R1 R2
Conductor Parasitic Resistance
RLOAD
(b) Adjustable Version
FIGURE 2 Conductor Parasitic Resistance Effects are Minimized by this Grounding Scheme For Fixed and Adjustable Output Regulators
(a),(b)
Calculating Power Dissipation and Heat Sink Requirements
GM6603 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 GM6603 so electrical isolation may be required for some applications. Thermal compound should always be used with high current regulators like the GM6603.
GM6603
7
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.
Typical Performance Characteristics
1.20
Reference Voltage Deviation(%)
+0.3 TCASE= 0C TCASE= 25C +0.2 +0.1 0 -0.1 -0.2 -0.3
1.15 1.10
Dropout Voltage(V)
1.05 1.00 0.95 0.90 0.85 0.80 0.75
TCASE= 125C
0 0.30 0.60 0.90 1.20 1.50 1.80 2.10 2.40 2.70 300
Qutput Current(A)
0
30
60
TJC
90
120
Figure 3. Dropout Voltage vs. Output Current
Figure 4. Bandgap Reference Voltage Deviation vs. Temperature
90 80 70
Ripple Rejection(dB) Minimum Load Current(mA)
0.65 0.60 TCASE= 25C 0.55 0.50 0.45 0.40 1 TCASE= 125C TCASE= 0C
60 50 40 30 20 10 1 10 10
2
10
3
10
4
10
5
10
6
2
3
4
5
6
7
8
Frequency(Hz)
VIN - VOUT(V)
Figure 5. Ripple Rejection vs. Frequency
Figure 6. Minimum Load Current vs. VIN - VOUT(V)
GM6603
8
TO-220 PACKAGE OUTLINE DIMENSIONS
9.90 0.20 3.60 0.20 1.30 0.10 1.70 1.50 DP0.20 9.20 0.20 3.70 0.20 15.90 0.20 4.60 18.95 MAX 3 8.70 2.80 0.10
4.50 0.20 8.0
+0.1 1.30 -0.05
7.0
0.9 7.0
8.40 1.46 1.00 45 3.00
3
3
13.08 0.20
10.08 0.30
1.27 0.10
3-R0.2
2.54 TYP (2.54 0.20)
0.80 0.10 1.52 0.10
0.50 -0.05
+0.1
2.40 0.20
3
3
2 - R 0.3
Unit: mm
10.00 0.20
TO-263-2 PACKAGE OUTLINE DIMENSIONS
9.90 0.20 0.40 15 1.20 3 1.50 DP0.20 9.20 0.20
4.50 0.20 1.30 -0.05
+0.1
Pad Layout
0.63 17.02 0.33 8.38 0.10 0.01 3 3 R0.30 2.40 0.20 2.54 0.10 0.50 -0.05 10.0 0.20 7.0 4.0 0.40 ( Inches ) mm
+0.1
0.12 3.05
15.3 0.20 1.4 0.20 4.90 0.20 0.90 0.10 1.27 0.10 2.54 TYP (2.54 0.20) 0.75 R0.30
2.00 0.10
0.42 10.66
0.24 6.096
0.04 1.016
3 R 0.3
3
0.90 R 0.45 7.2 9.20 0.20
10.00 0.20
4.90 0.20
Unit: mm
GM6603
9
TO-252 PACKAGE OUTLINE DIMENSIONS
6.50 0.05 5.340 0.05 29 0.5 REF 0.6 7
2.30 0.05 0.508 0.0127
Pad Layout
0.244 6.20 0.118 3.0
1.0 0.05 6.10 0.05 7.20 0.05 7 0.070 0.05 9.900 7 0.75 0.10 2.70 0.10 R 0.25 0.13 0.81 0.038 1.525 0.10
0.228 5.80
0.75 0.10 0.89 0.05
0.243 6.172
0.101 2.58
0.063 1.6
(
Inches ) mm
R0.15 max 2
Unit: mm
ORDERING NUMBER
GM 6603 1.8 TB3 T
Gamma Micro. Shipping T: Tube R: Tape & Reel Package TA3: TO-263-2 TB3: TO-220 TC3: TO-252
Circuit Type
GM6603
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
10
11
GM6603

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