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GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Description
GM6603 series of positive adjustable and fixed regulators is designed to provide 3A output current with low dropout voltage performance. On-chip trimming adjusts the reference voltage with an accuracy of O 2%. Besides the features mentioned, GM6603 works well in post regulators or micro-processor power supplies where low voltage operation and fast transient response are required. GM6603 includes over current protection and thermal shutdown protection as well.
GM6605 is available in TO-220 and surface-mount TO252 and TO-263 packages.
Features
Adjustable or Fixed Output Output Current of 3.0A Low Dropout, 1.15V max at 3A Output Current 0.04% Line Regulation 0.2 % Load Regulation Current Limit Protection 100% Thermal Limit Burn-In Fast Transient Response
Applications
Microprocessor Supply Post Regulators for Switching Supplies Telecommunication Systems Printer Supplies Motherboards
Typical Application Circuit
VIN > 4.75V
3 VIN
GM6603-3.3
1 GND
2 VOUT
VOUT = 3.3V 3.0A
COUT 10F
VIN > 4.75V
3 VIN
GM6603-adj
1 ADJ
2 VOUT
VOUT =3.45V 3.0A R1 133 1%
CIN 10F
CIN 10F
COUT 10F
Fixed Output Voltage Version
Notes: 1. C IN needed if device is far from filter capacitors 2. C OUT minimum value required for stability
Adjustable Output Voltage Version
1
GM6603V1.00
R2 232 1%
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Marking Information and Pin Configurations (Top View)
TO 252 (D-PAK) TO 220 TO 263 (D2-PAK)
GM6603 VVAYWW GM6603 VVAYWW 1.GND/ADJ 2. VOUT 3. VIN
GM6603 VVAYWW
2. VOUT
1. GND/ADJ
3. VIN
2 VOUT
VV: Output Voltage Codes (05: 5.0V, ...A: ADJ) A: Assembly/Test Site Code Y: Year WW: Week
1. GND/ADJ
3. VIN
GM6603V1.00
2
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Ordering Information
Ordering Number GM6603-ATA3T GM6603-ATA3R GM6603-ATB3T GM6603-ATC3T GM6603-ATC3R GM6603-1.8TA3T GM6603-1.8TA3R GM6603-1.8TB3T GM6603-1.8TC3T GM6603-1.8TC3R GM6603-2.5TA3T GM6603-2.5TA3R GM6603-2.5TB3T GM6603-2.5TC3T GM6603-2.5TC3R GM6603-3.3TA3T GM6603-3.3TA3R GM6603-3.3TB3T GM6603-3.3TC3T GM6603-3.3TC3R GM6603-5.0TA3T GM6603-5.0TA3R GM6603-5.0TB3T GM6603-5.0TC3T GM6603-5.0TC3R 5.0V 3.3V 2.5V 1.8V Adj VOUT Package TO-263 TO-263 TO-220 TO-252 TO-252 TO-263 TO-263 TO-220 TO-252 TO-252 TO-263 TO-263 TO-220 TO-252 TO-252 TO-263 TO-263 TO-220 TO-252 TO-252 TO-263 TO-263 TO-220 TO-252 TO-252 Shipping 50 Units/Tube 800 Units / Reel 50 Units/Tube 80 Units/Tube 2,500 Units / Reel 50 Units/Tube 800 Units / Reel 50 Units/Tube 80 Units/Tube 2,500 Units / Reel 50 Units/Tube 800 Units / Reel 50 Units/Tube 80 Units/Tube 2,500 Units / Reel 50 Units/Tube 800 Units / Reel 50 Units/Tube 80 Units/Tube 2,500 Units / Reel 50 Units/Tube 800 Units / Reel 50 Units/Tube 80 Units/Tube 2,500 Units / Reel
3
GM6603V1.00
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Absolute Maximum Ratings
PARAMETER Input Voltage Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature 1.6mm (1/6 inch) from case for 10 seconds SYMBOL VI PD TJ Tstg RATINGS 15 Internally Limited - 40 to 125 - 60 to 150 260 UNITS V W C C C
Block Diagram
VIN
VOUT
ADJ
For fixed output Options GND
GM6603V1.00
4
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Electrical Characteristics (TI = 25C, Inless otherwise noted)
Parameter
Reference Voltage GM6603-A
Symbol
VREF
Test Condition
IOUT = 10mA, VIN - VOUT = 1.5V 10mA IOUT 3A, 1.5V VIN - VOUT 10V IOUT = 10mA, VIN = 3.3V
Min
1.238 1.225 1.782 1.764 2.475 2.460 3.267 3.247 4.950 4.920
Typ
1.250 1.250 1.800 1.800 2.500 2.500 3.300 3.300 5.000 5.000
Max
1.262 1.275 1.818 1.836 2.525 2.540 3.333 3.353 5.050 5.080
Unit
V
GM6603-1.8
10mA IOUT 5A, 3.3V VIN 10V IOUT = 10mA, VIN = 4V
GM6603-2.5 Output Voltage GM6603-3.3 VO
10mA IOUT 5A, 4V VIN 10V IOUT = 10mA, VIN = 4.8V 10mA IOUT 5A, 4.8V VIN 7V IOUT = 10mA, VIN = 6.5V
V
GM6603-5.0 GM6603-A GM6603-1.8 Line Regulation GM6603-2.5 GM6603-3.3 GM6603-5.0 GM6603-A Load Regulation GM6603-1.8 GM6603-2.5 GM6603-3.3 GM6603-5.0 Dropout Voltage Current Limit Minimum Load Current GM6603-1.8 Quiescent Current GM6603-2.5 GM6603-3.3 GM6603-5.0 Adjust Pin Current GM6603-A IADJ IQ VD ICL IO(MIN) VOL VOI
10mA IOUT 5A, 6.5V VIN 10V IOUT = 10mA IOUT = 10mA, 3.3V VIN 10V IOUT = 10mA, 4V VIN 10V IOUT = 10mA, 4.8V VIN 10V IOUT = 10mA, 6.5V VIN 10V VIN -VOUT =1.5V, 10mA IOUT 3A VIN = 3.3V, 10mA IOUT 3A VIN = 4.0V, 10mA IOUT 3A VIN = 4.8V, 10mA IOUT 3A VIN = 6.5V, 10mA IOUT 3A IOUT = 3A VIN -VOUT =3V VIN = 5.0V VIN = 3.3V, 10mA IOUT 3A VIN = 4.0V, 10mA IOUT 3A VIN = 4,8V, 10mA IOUT 3A VIN = 6.5V, 10mA IOUT 3A IOUT = 10mA, 2.75V VIN 10V IOUT = 10mA, VIN - VOUT = 1.5V RA IOUT = 3A, VIN - VOUT = 1.5V
0.04
0.20
%
0.2
0.40
%
1.15 3 4.5 3
1.3 7
V A mA
7
10
mA
40 0.005 60 80
90
A %/C dB
Temperature Coefficient Ripple Rejection
5
GM6603V1.00
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
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. The GM6603 has a composite PNP-NPN output transistor and require an output capacitor for stability. A detailed procedure for selecting this capacitor is as below: Stability Considerations The circuit design used in the GM6603 series requires the use of an output capacitor as part of the device frequency compensation. The addition of 150F aluminum electrolytic or a 22F solid tantalum on the output will ensure stability for all operating conditions. When the adjustment terminal is bypassed with a capacitor to improve the ripple rejection, the requirement for an output capacitor increases. The value of 22F tantalum or 150F aluminum covers all cases of bypassing the adjustment terminal. Without bypassing the adjustment terminal smaller capacitors can be used with equally good results. To ensure good transient response with heavy load current changes capacitor values on the order of 100F are used in the output of many regulators. To further improve stability and transient response of these devices larger values of output capacitor can be used. Protection Diodes Unlike older regulators, the GM6603 family does not need any protection diodes between the adjustment pin and the output and from the output to the input to prevent over stressing the die. Internal resistors are limiting the internal current paths on the GM6603 adjustment pin, therefore even with capacitors on the adjustment pin no protection diode is needed to ensure device safety under short-circuit conditions. Microsecond surge currents of 50A to 100A can be handled by the internal diode between the input and output pins of the device. In normal operations it is difficult to get those values of surge currents even with the use of large output capacitances. If high value output capacitors are used, such as 1000F to 5000F at the input pin, is instantaneously shorted to ground, damage can occur. A diode from output to input is recommended, when a crowbar circuit at the input of the GM6603 is used. Normal power supply cycling or even plugging and unplugging in the system will not generate current large enough to do any damage. The adjustment pin can be driven on a transient basis 25V, with respect to the output without any device degradation. As with any IC regulator, none the protection circuitry will be functional and the internal transistors will break down if the maximum input to output voltage differential is exceeded.
1N4002
VIN
GM6603-Adj
ADJ R1
VOUT COUT 150F
CADJ 10F
R2
Diodes between the input and output are not usually needed.
GM6603V1.00
6
Ripple Rejectiopn The ripple rejection values are measured with the adjustment pin bypassed. The impedance of the adjust pin capacitor at the ripple frequency should be less than the value of R1 (normally 100. to 120.) for a proper bypassing and ripple rejection approaching the values shown. The size of the required adjust pin capacitor is a function of the input ripple frequency. If R1=100. at 120Hz the adjust pin capacitor should be 25F. At 10kHz only 0.22F is needed. The ripple rejection will be a function of output voltage, in circuits without an adjust pin bypass capacitor. The output ripple will increase directly as a ratio of the output voltage to the reference voltage (VOUT / VREF).
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Output Voltage Sensing
GM6603 series is a three-terminal regulator, so it 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 1n F1gure 2.
Conductor Parasitic RC Resistance
RLOAD
VIN
VOUT
VIN
VOUT
Conductor Parasitic RC Resistance
RLOAD
GM6603-3.3
GND
GM6603-A
ADJ
R1 R2
(a) Fixed version
(b) Adjustable version
Figure 1. Conductor Parasitic Resistance Effects are Minimized by this Grounding Scheme.
Calculating Power Dissipation and Heat Sink Requirements GM6603 series 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 to use an adequate heat sink. The case is connected to VOUT on GM6603, so electrical isolation may be required for some applicat1ons. Thermal compound should always be used with high current regulators like GM6603. The thermal characteristics of an IC depend on four factors: 1. 2. 3. 4. Maximum Ambient Temperature TA (C) Power Dissipation PD (Watts) Maximum Junction Temperature TJ (C) Thermal Resistance Junction to amb1ent JA
The relationship of these four factors is expressed by equation (1): TJ = TA + PD x JA Maximum ambient temperature and power dissipation are determ1ned 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) ) x IOUT(MIN) + VIN(MIN) x 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 max1mum quiescent current at IOUT(MAX). A heat sink effect1vely 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 resistance are summed to determine JA, the total thermal resistance between the junction and the air. This is expressed by equation (3): JA = JC + CS + SA where: JC is the thermal resistance of Junction to Case, CS is the thermal resistance of Case to Heat Sink, SA is the thermal resistance of Heat Sink to Ambient air. The value for JA is calculated using equation (3) and the result can be substituted in equation (1). The value for CS is 3.5C/W for a given package typed based on an average d1ie size. For a high current regulator such as GM6603, the majority of the heat is generated in the power transistor sect1on.
7
GM6603V1.00
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Typical Performance Characteristics
1.12 1.15
+0.3 Reference Voltage Deviation (%) TCASE = 0C TCASE = 25C +0.2 +0.1 0 -0.1 -0.2 -0.3 0 30 60 TJ (C) Figure 2. Bandgap Reference Voltage Deviation Vs. Temperature 90 120
Dropout Voltage (V)
1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0
TCASE = 125C
0.30 0.60 0.90 1.20 1.50 1.80 2.10 2.40 2.70 3.00
Output Current(A) Figure 1. Dropout Voltage vs. Output Current
90 Minimum Load Current (mA) 80 Ripple Rejection (dB) 70 60 50 40 30 20 10 1 10 102 104 103 Frequency (Hz) 105 106
0.65 0.60 TCASE = 25C 0.55 0.50 0.45 0.40 1 TCASE = 125C TCASE = 0C
2
3
4
5
6
7
8
VIN - VOUT (V) Figure 4. Minimum Load Current vs. VIN - VOUT
Figure 3. Ripple Rejection vs. Frequency
GM6603V1.00
8
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Package Outline Dimensions - TO263
0.390 - 0.415 (9.906 - 10.541)
0.105 - 0.180 (4.191 - 4.572)
0.045 - 0.055 (1.143 - 1.397)
0.060 (1.524) TYP
15 TYP
0.330 - 0.370 (8.382 - 9.398)
0.143 + 0.012 0.143 - 0.002 (3.632 + 0305) (3.362 - 0.508)
0.059 (1.499) TYP 0.050 +/- 0.012 (1.270 +/- 0.305) 0.020 - 0.039 (0.510 - 0.990)
0.090 - 0.110 (2.286 - 2.794)
0.050 (1.270)
0.013 - 0.023 (0.330 - 0.584)
Package Outline Dimensions - TO220
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 0.9 7.0 8.70 2.80 0.10 4.50 0.20
+0.1
8.0 7.0 1.30 -0.05
8.40 1.46 1.00 45 3.00
3
3
13.08 0.20
2.54 TYP (2.54 0.20)
0.80 0.10 1.52 0.10
10.08 0.30
1.27 0.10
3-R0.2
0.50 -0.05
+0.1
2.40 0.20
3
3
2 - R 0.3
Unit: mm
10.00 0.20
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GM6603V1.00
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Package Outline Dimensions - TO252
0.039 - 0.050 (1.020 - 1.270) 0.055 - 0.080 (1.400 - 2.030) 0.018 - 0.023 (0.460 - 0.580)
0.205 - 0.215 (5.210 - 5.460)
SEATING PLAN
0.210 - 0.228 (5.330 - 5.800)
0.370 - 0.410 (9.400 - 10.420)
0.090 (2.285) TYP 0.180 (4.570) TYP
0.045 - 0.060 (1.150 - 1.520) 0.030 - 0.045 (0.760 - 1.140)
0.020 (0.510) MIN 0.018 - 0.023 (0.460 - 0.580)
GM6603V1.00
10
GM6603
3.0A LOW DROPOUT PRECISION REGULATOR
Ordering Number
GM 6603 - 1.8 TA3
APM Gamma Micro Circuit Type Output Voltages A: ADJ 1.8: 1.8V 2.5: 2.5V 3.3: 3.3V 5.0: 5.0V Package Type TA3: TO263 TB3: TO220 TC3: TO252
T
Shipping Type
T: Tube R: Tape & Reel
8 10 6
11
GM6603V1.00

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