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GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Description
GM6605 series of positive adjustable and fixed regulators is designed to provide 5A output current with low dropout voltage performance. On-chip trimming adjusts the reference voltage with an accuracy of O 1% for adjustable, and O 2% for fixed output voltage versions. Besides the features mentioned, GM6605 works well in post regulators or micro-processor power supplies where low voltage operation and fast transient response are required. GM6605 includes over current protection and thermal shutdown protection as well.
GM6605 is available in TO-220 and surface-mount TO263 packages.
Features
Adjustable or Fixed Output Output Current of 5A Low Dropout, 1.5V max at 5A Output Current 0.04% Line Regulation 0.2 % Load Regulation 100% Thermal Limit Burn-In Fast Transient Response
Applications
Microprocessor Supply Post Regulators for Switching Supplies Telecommunication Systems Medical Equipment Printer Supplies Motherboards
Typical Application Circuit
VIN
VOUT
GM6605-x.x
CIN COUT
VIN
5.0A
GM6605-adj VREF
R1
VOUT 5.0A
CIN
COUT R2
Fixed Output Voltage Version
Adjustable Output Voltage Version VOUT = VREF X ( 1 + R2 R1 ) + IADJ X R2
GM6605V2.04
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GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Marking Information and Pin Configurations (Top View)
TO 252 (D-PAK) TO 220 TO 263 (D2-PAK)
GM6605 VVAYWW GM6605 VVAYWW 1.GND/ADJ 1.GND/ADJ 2. VOUT 2. VOUT 3. VIN
GM6605 VVAYWW
2. VOUT
1. GND/ADJ
3. V
IN
2 VOUT
1. GND/ADJ
3. VIN
GM6605G VVAYWW GM6605G VVAYWW 3. VIN
GM6605G VVAYWW
2. VOUT
1. GND/ADJ
3. VIN
2 VOUT
GM6605V2.04
G: Green Product VV: Output Voltage Codes (05: 5.0V, ...A: ADJ) A: Assembly/Test Site Code Y: Year WW: Week
1. GND/ADJ
3. VIN
2
GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Ordering Information
Ordering Number GM6605-ATA3T GM6605-ATA3R GM6605-ATB3T GM6605-ATC3T GM6605-ATC3R GM6605-1.8TA3T GM6605-1.8TA3R GM6605-1.8TB3T GM6605-1.8TC3T GM6605-1.8TC3R GM6605-2.5TA3T GM6605-2.5TA3R GM6605-2.5TB3T GM6605-2.5TC3T GM6605-2.5TC3R GM6605-3.3TA3T GM6605-3.3TA3R GM6605-3.3TB3T GM6605-3.3TC3T GM6605-3.3TC3R GM6605-5.0TA3T GM6605-5.0TA3R GM6605-5.0TB3T GM6605-5.0TC3T GM6605-5.0TC3R 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
GM6605V2.04
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GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Ordering Information - Green Products
Ordering Number GM6605-ATA3TG GM6605-ATA3RG GM6605-ATB3TG GM6605-ATC3TG GM6605-ATC3RG GM6605-1.8TA3TG GM6605-1.8TA3RG GM6605-1.8TB3TG GM6605-1.8TC3TG GM6605-1.8TC3RG GM6605-2.5TA3TG GM6605-2.5TA3RG GM6605-2.5TB3TG GM6605-2.5TC3TG GM6605-2.5TC3RG GM6605-3.3TA3TG GM6605-3.3TA3RG GM6605-3.3TB3TG GM6605-3.3TC3TG GM6605-3.3TC3RG GM6605-5.0TA3TG GM6605-5.0TA3RG GM6605-5.0TB3TG GM6605-5.0TC3TG 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
GM6605V2.04
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GM6605-5.0TC3RG
GM6605
5.0A 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
Thermal Limit VOUT
ADJ
For fixed output Options GND
GM6605V2.04
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GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Electrical Characteristics (TI = 25C, Inless otherwise noted)
Parameter
Reference Voltage GM6605-A
Symbol
VREF
Test Condition
IOUT = 10mA, VIN - VOUT = 1.5V 10mA IOUT 5A, 3.3V VIN 7V IOUT = 10mA, VIN = 3.3V 10mA IOUT 5A, 3.3V VIN 7V IOUT = 10mA, VIN = 4V
Min
1.238 1.230 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 1.270 1.818 1.836 2.525 2.540 3.333 3.353 5.050 5.080
Unit
V
GM6605-1.8
GM6605-2.5 Output Voltage GM6605-3.3 VO
10mA IOUT 5A, 4V VIN 7V IOUT = 10mA, VIN = 4.8V 10mA IOUT 5A, 4.8V VIN 7V IOUT = 10mA, VIN = 6.5V 10mA IOUT 5A, 6.5V VIN 7V IOUT = 10mA, 3.3V VIN 7V IOUT = 10mA, 3.3V VIN 7V
V
GM6605-5.0 GM6605-A GM6605-1.8 Line Regulation GM6605-2.5 GM6605-3.3 GM6605-5.0 GM6605-A GM6605-1.8 Load Regulation GM6605-2.5 GM6605-3.3 GM6605-5.0 Dropout Voltage Current Limit Minimum Load Current GM6605-1.8 Quiescent Current GM6605-2.5 GM6605-3.3 GM6605-5.0 Adjust Pin Current GM6605-A IADJ IQ VD ICL IO(MIN) VOL VOI
IOUT = 10mA, 4V VIN 7V IOUT = 10mA, 4.8V VIN 7V IOUT = 10mA, 6.5V VIN 7V VIN -VOUT =1.5V,10mA IOUT 5A VIN = 3.3V, 10mA IOUT 5A VIN = 4.0V, 10mA IOUT 5A VIN = 4,8V, 10mA IOUT 5A VIN = 6.5V, 10mA IOUT 5A IOUT = 5A VIN -VOUT =3V VIN = 5.0V VIN = 3.3V, 10mA IOUT 5A VIN = 4.0V, 10mA IOUT 5A VIN = 4,8V, 10mA IOUT 5A VIN = 6.5V, 10mA IOUT 5A IOUT = 10mA, 2.75V VIN 7V IOUT = 10mA, VIN - VOUT = 1.5V 5.5
0.04
0.20
%
0.08
0.40
%
1.3 6.8 5
1.5 10
V A mA
5
10
mA
50 0.005 60 80
120
A %/C dB
Temperature Coefficient
GM6605V2.04
Ripple Rejection
RA
IOUT = 5A, VIN - VOUT = 1.5V
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GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
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. A detailed procedure for selecting this capacitor is as below: 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 GM6605 higher capacitance values will improve the transient response and stability. Most applications for Gm6605 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:
V = I x ESR 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 the best results.
Protection Diodes When large external capacitors are used with most linear regulators, 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.
1N4002 1N4002
VIN
VOUT
VIN
VOUT
GM6605-3.3
C1 GND C2 C1
GM6605-Adj
ADJ CADJ R1
C2
R2
(a) Fixed version
(b) Adjustable version
Figure 1. Protection Diode Scheme for large Output Capacitors
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For GM6605, 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 is recommended.
GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Output Voltage Sensing
GM6605 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, GM6605 should be connected as shown 1n F1gure 2.
Conductor Parasitic RC Resistance
RLOAD
VIN
VOUT
VIN
VOUT
Conductor Parasitic RC Resistance
RLOAD
GM6605-3.3
GND
GM6605-A
ADJ
R1 R2
(a) Fixed version
(b) Adjustable version
Figure 2. Conductor parasitic resistance effects are minimized by this grounding scheme.
Calculating Power Dissipation and Heat Sink Requirements GM6605 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 GM6605, so electrical isolation may be required for some applicat1ons. Thermal compound should always be used with high current regulators like GM6605. 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):
GM6605V2.04
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 GM6605, the majority of the heat is generated in the power transistor sect1on.
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GM6605
5.0A 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
GM6605V2.04
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GM6605
5.0A 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 - 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
0.045 - 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)
GM6605V2.04
0.180 (4.570) TYP
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GM6605
5.0A LOW DROPOUT PRECISION REGULATOR
Ordering Number
GM 6605
APM Gamma Micro Circuit Type
- 1.8 TA3
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
G
Blank: Pb-free G:Green
T: Tube R: Tape & Reel
Note: Pb-free products: RoHS compliant and compatible with the current require-ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes with 100% matte tin (Sn) plating. Lead-free (RoHS compliant) Halogen free(Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by weight)
Green products:
GM6605V2.04
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