GM6605ATB3T

GM6605 5.0A PRECISION LINEAR REGULATORS Power Management Description The GM6605 series of positive adjustable and fixed regulators are designed to provide 5A output with low dropout voltage performance. On-chip trimming adjusts the reference voltage with an accuracy of ±1% for adjustable, and ±2% for fixed voltage versions. Put them 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. The GM6605’s are available in TO-220 and surfacemount TO-263 packages. Features Adjustable or Fixed Output Output Current of 5.0A Dropout Voltage (typical) 1.2V @ 5.0A Typical Line Regulation 0.04% Typical Load Regulation 0.08% Fast Transient Response Current Limit Protection Thermal Shutdown Protection Application Microprocessor Supply Post Regulators for Switching Supplies Telecommunication Systems Medical Equipment Printer Supplies Motherboards TYPICAL APPLICATION CIRCUITS GM6605-Adj 5.0V ADJ 124W 1.0% 3.3V@3.0A 5.0V GM6605-3.3 GND 3.3V@3.0A 10µF 5.0V 0.1µF 5.0V 200W 1.0% 22µF 5.0V 10µF 5.0V 22µF 5.0V (Adjustable Version) (Fixed Version) www.gammamicro.com PRELIMINARY GM6605 1 Revision 1, Feb. 2004 VIN VOUT VIN VOUT GM6605 MARKING INFORMATION & PIN CONFIGURATIONS (Top View) TO-252 (DPAK) TO-220 TO-263-2 (D PAK) 2 GM6605 VVAYWW GM6605 VVAYWW GM6605 VVAYWW VIN VOUT GND* VIN VOUT GND* V V = Output Voltage (50 = 5.0V, A =Adj ) A = Assembly Location Y = Year W W = Work Week VIN VOUT GND* On fixed versions Pin 1 = GND, on adjustable versions Pin 1 = ADJ Tab = VOUT ORDERING INFORMATION Ordering Number GM6605-ATA3T GM6605-ATA3R GM6605-ATB3T GM6605-1.8TA3T GM6605-1.8TA3R GM6605-1.8TB3T GM6605-2.5TA3T GM6605-2.5TA3R GM6605-2.5TB3T GM6605-3.3TA3T GM6605-3.3TA3R GM6605-3.3TB3T Output Voltage Adj Adj Adj 1.8 1.8 1.8 2.5 2.5 2.5 3.3 3.3 3.3 3.3 3.3 5.0 5.0 5.0 Package TO-263-2 TO-263-2 T O-220 TO-263-2 TO-263-2 TO-220 TO-263-2 TO-263-2 TO-220 TO-263-2 TO-263-2 TO-220 TO-252 TO-252 TO-263-2 TO-263-2 TO-220 Shipping 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 50 Units / Tube 50 Units / Tube 800 Units / Tape & Reel 50 Units / Tube 80 Units / Tube 2,500 Units / Tape & Reel 50 Units / Tube 800 Units / Tape & Reel 50 Units / Tube GM6605 GM6605-3.3TC3T GM6605-3.3TC3R GM6605-5.0TA3T GM6605-5.0TA3R GM6605-5.0TB3T 2 * For detail Ordering Number identification, please see last page. GM6605 ABSOLUTE MAXIMUM RATINGS PARAMETER Power Dissipation Input Voltage Junction Temperature Lead Temperature(Soldering, 10sec) SYMBOL PD VIN TJ TLEAD TJ TSTG ESD VALUE Internally limited 7.0 +150 300 0 to + 125 -65 to + 150 2.0 UNIT W V °C °C °C °C KV Operating Junction Temperature Range Storage Temperature Range ESD Damage Threshold BLOCK DIAGRAM (Fixed Version) VOUT VIN Thermal Shutdown Bandgap Reference + Error Amplifier Output Current Limit GND (Adjustable Version) VOUT VIN Thermal Shutdown Bandgap Reference + Error Amplifier ADJ GM6605 3 Output Current Limit GM6605 ELECTRICAL CHARACTERISTICS (Typicals and limits appearing in normal type apply for TJ = 25°C) Parameter Reference Voltage GM6605-Adj GM6605-1.8 GM6605-2.5 Output Voltage GM6605-3.3 GM6605-5.0 GM6605-Adj GM6605-1.8 Line Regulation GM6605-2.5 GM6605-3.3 GM6605-5.0 GM6605-Adj GM6605-1.8 Load Regulation GM6605-2.5 GM6605-3.3 GM6605-5.0 Dropout Voltage Current Limit Minimum Load Current GM6605-Adj GM6605-1.8 GM6605-2.5 Quiescent Current GM6605-3.3 GM6605-5.0 Adjust Pin Current Temperature Coefficient GM6605-Adj IADJ IQ VD ICL IO MIN REGLOAD REGLINE VO Symbol VREF 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 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, IOUT=10mA, 3.3V IOUT=10mA, 4V IOUT=10mA, 4.8V IOUT=10mA, 6.5V VIN VIN VIN VIN 7V 7V 7V 7V 5A 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 0.04 0.04 0.04 0.04 0.04 0.08 0.08 0.08 0.08 0.08 1.15 Max 1.262 1.270 1.818 1.836 2.525 2.540 3.333 3.353 5.050 5.080 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 5A 5A 5A 5A % IOUT=5A 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 5A 5A 5A 5A V A 5.5 6.8 5 5 5 5 5 10 10 10 mA mA 10 10 120 µA %/°C %/W dB IOUT=10mA, 2.75V VIN 7V 50 0.005 0.003 60 80 VIN-VOUT=1.5V, IOUT=10mA TC RA TA=25°C, 30ms pulse VIN-VOUT=1.5V, IOUT=5A GM6605 4 Thermal Regulation Ripple Rejection GM6605 APPLICATION INFORMATION The GM6605 series linear regulators provide fixed and adjustable output voltages at currents up to 5.0A. These regulators are protected against overcurrent conditions and include thermal shutdown protection. The GM6605's have a composite PNP-NPN output transistor and require an output capacitor for stability. A detailed procedure for selecting this capacitor follows. 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 (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 best. A 22µF tantalum capacitor will work fine in most applications, but with high current regulators such as the GM6605 higher capacitance values will improve the transient response and stability. Most applications for the GM6605'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: C1 VIN C1 Protection Diode Scheme for Large Output Capacitors (a) Fixed Version IN4002 VIN VIN VOUT VOUT GM6605-3.3 GND C2 (b) Adjustable Version VIN IN4002 VOUT ADJ VOUT C2 GM6605-Adj R1 CADJ 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 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 the GM6605 linear regulators, the discharge path 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 5 is through a large junction, and protection diodes are GM6605 Output Voltage Sensing The GM6605 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 GM6605 should be connected as shown in Figure 2. VIN VIN VOUT RC Conductor Parasitic Resistance RLOAD 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 ........(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 resistance 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 the GM6605 the majority of the heat is generated in the power transistor section. GM6605-3.3 GND (a) Fixed Version VIN VIN ADJ VOUT GM6605-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 The 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 temper- , GM6605 6 atures accurately to be sure that you use and adequate heat sink. The case is connected to VOUT on the GM6605, so electrical isolation may be required for some applications. Thermal compound should always be used with high current regulators like the GM6605. GM6605 Typical Performance Characteristics 1.20 Reference Voltage Deviation(%) +0.3 TCASE= 0°C TCASE= 25°C +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= 125°C 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 TJ°C 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= 25°C 0.55 0.50 0.45 0.40 1 TCASE= 125°C TCASE= 0°C 60 50 40 30 20 10 101 102 103 104 Frequency(Hz) 105 106 2 3 4 5 6 7 8 VIN - VOUT(V) Figure 5. Ripple Rejection vs. Frequency Figure 6. Minimum Load Current vs. VIN - VOUT(V) GM6605 7 GM6605 TO-252 PACKAGE OUTLINE DIMENSIONS 6.50 ± 0.05 5.340 ± 0.05 29° ± 0.5° REF 0.6 0.508 ± 0.0127 7° 2.30 ± 0.05 6.10 ± 0.05 7.20 ± 0.05 0.75 ± 0.10 0.89 ± 0.05 0.81 ± 0.038 G 7° 1.20 3° 9.20 ± 0.20 Pad Layout 1.0 ± 0.05 0.244 6.20 0.070 ± 0.05 9.900 7° 0.75 ± 0.10 2.70 ± 0.10 1.525 ± 0.10 0.228 5.80 0.118 3.0 0.243 6.172 R 0.25 ± 0.13 0.101 2.58 0.063 1.6 ( Inches ) mm R0.15 max 2° Unit: mm TO-263-2 PACKAGE OUTLINE DIMENSIONS 9.90 ± 0.20 0.40 15° 4.50 ± 0.20 1.30 -0.05 +0.1 P ad Layout 0.63 17.02 0.33 8.38 0.10 ± 0.01 3° R0.30 2.40 ± 0.20 2.54 ± 0.10 0.50 -0.05 10.0 ± 0.20 7.0 4.0 0.04 1.016 +0.1 1.50 DP0.20 1.4 ± 0.20 1.27 ± 0.10 2.54 TYP (2.54 ± 0.20) GM6605 3° R 0.3 P 15.3 ± 0.20 4.90 ± 0.20 0.90 ± 0.10 0.40 3° 0.90 0.12 3.05 3° 2.00 ± 0.10 0.42 10.66 0.24 6.096 0.75 R0.30 ( Inches ) mm R 0.45 7.2 9.20 ± 0.20 10.00 ± 0.20 8 4.90 ± 0.20 Unit: mm GM6605 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 8.70 2.80 ± 0.10 4.50 ± 0.20 8.0 +0.1 1.30 -0.05 7.0 8.40 1.46 1.00 45° 3.00 10.08 ± 0.30 1.27 ± 0.10 P 3° 3° 3-R0.2 18.95 MAX 0.9 7.0 3° 13.08 ± 0.20 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 ORDERING NUMBER GM 6605 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 Output Voltage A: Adj, 1.5: 1.5V 1.8: 1.8V, 2.5: 2.5V 3.3: 3.3V, 5.0: 5.0V GM6605 9