SM645/SM646/SM647 SWITCHING REGULATOR POWER OUTPUT STAGES DESCRIPTION FEATURES The SM645/646/647 series of Power Output Stages are especially designed to be driven with standard PWM integrated circuits to form an efficient switching power supply. The SM645, SM646 and SM647 are optimized for non-isolated Buck and Buck-Boost application. The hybrid circuit construction utilizes thick film resistors on a beryllia substrate for maximum thermal conductivity and resultant low thermal impedance. All of the active elements in the hybrid are fully passivated. • Equivalent to the Unitrode PIC 645, 646, 647 • 15A current capability • Cost saving design reduces size, improves efficiency, reduces noise and RFI • High operating frequency (to > 100KHz) results in smaller inductor-capacitor filter and improved power supply response time • High operating efficiency at 7A typical performance Rise and fall time < 300ns Efficiency > 85% HIGH RELIABILITY FEATURES ♦ Available with high reliability processing FUNCTIONAL DIAGRAM SM645/SM646/SM647 LINFINITY 4/90 Rev 1.1 2/94 Copyright 1994 1 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SM645/SM646/SM647 ABSOLUTE MAXIMUM RATINGS (Note 1) SM645 Input Voltage, V4 - 2 ......................................... 60V Output Voltage, V1 - 2 ...................................... 60v 5V Drive Input Reverse Voltage, V3 - 4 ................ Continuous Output Current, I1 ....................... 15A Peak Output Current ..................................... 20A Drive Current, I3 ............................................ -0.4A Thermal Resistance Power Switch, θJ - C ................................................... 2.0°C/W Commutating Diode ................................................. 2.0°C/W Case to Ambient, θ C - A ............................................ 30.0°C/W SM646 80V 80v 5V 15A 20A -0.4A SM647 100V 100V 5V 15A 20A -0.4A Operating Junction Temperature Hermetic (K Package) .................................................. 150°C Storage Temperature Range ............................. -65°C to 150°C Lead Temperature (Soldering, 10 Seconds) ................... 300°C Note 1. Exceeding these ratings could cause damage to the device. THERMAL DATA K Package: Thermal Resistance-Junction to Case, θJC .................. 2.0°C/W Thermal Resistance-Junction to Ambient, θJA .............. 35°C/W RECOMMENDED OPERATING CONDITIONS Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA). Note B. The above numbers for θ JC are maximums for the limiting thermal resistance of the package in a standard mounting configuration. The θ JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow. (Note 2) Input Voltage, V4 - 2 .......................................... Output Voltage, V1 - 2 ....................................... Drive Input Reverse Voltage, V3 - 4 .................. Output Current, I1 ........................................... Drive Current, I3 .............................................. SM645 50V 50v 4V 13A -0.3A SM646 70V 70v 4V 13A -0.3A SM647 90V 90V 4V 13A -0.3A Operating Ambient Temperature Range SM6XXK ....................................................... 0°C to 70°C SM6XXHRK ............................................ -55°C to 125°C Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply for the operating ambient temperature of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter On-State Voltage (Note 3) Diode Forward Voltage (Note 3) Off-State Current Diode Reverse Current Test Conditions I4 = 7A(-7A), I3 = -30mA(30mA) I4 = 15A(-15A), I3 = -30mA(30mA) I4 = 7A(-7A) I4 = 15A(-15A) V4 = Rated input voltage V4 = Rated input voltage, TA = 125°C V1 = Rated output voltage V1 = Rated output voltage, TA = 125°C SG645/646/647 Min. Typ. Max. 1.0 1.5 2.5 3.5 0.85 1.25 0.95 1.75 0.1 10 10 1.0 10 500 Units V V V V µA µA µA µA Note 3. Pulse test: Duration = 300µs, Duty Cycle ≤ 2%. LINFINITY 4/90 Rev 1.1 2/94 Copyright 1994 2 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SM645/SM646/SM647 ELECTRICAL CHARACTERISTICS (continued) Parameter Test Conditions Dynamic Characteristics (See Figures 1 & 2) (Notes 4 & 5) Current Delay Time Current Rise Time Voltage Rise Time Voltage Storage Time Voltage Fall Time Current Fall Time Efficiency (Note 5) AC TEST CIRCUIT AND SWITCHING TIME WAVEFORMS SG645/646/647 Min. Typ. Max. Units 35 65 40 700 70 175 85 ns ns ns ns ns ns % 60 150 60 175 300 (Note 6) SM645 SM646 SM647 FIGURE 1 - SM645/646/647 SWITCHING SPEED CIRCUIT FIGURE 2 - SM645/646/647 SWITCHING WAVEFORMS Note 4. In switching an inductive load, the current will lead the voltage on turn-on and lag the voltage on turn-off (see Figure 2). Therefore, Voltage Delay Time (tDV) ≅ tdi + tri and Current Storage Time (t si) ≅ tsv + tfv . Note 5. The efficiency is a measure of internal power losses and is equal to Output Power divided by Input Power. The switching speed circuit of Figure 1, in which the efficiency measured, is represenative of typical operating conditions for the SM600 series switching regulators. APPLICATION CIRCUITS SM64X SM64X FIGURE 3 - STEP DOWN (BUCK) CONVERTER FIGURE 4 - NEGATIVE OUTPUT DOWN/UP (BUCK-BOOST) CONVERTER LINFINITY 4/90 Rev 1.1 2/94 Copyright 1994 3 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SM645/SM646/SM647 CONNECTION DIAGRAMS & ORDERING INFORMATION Package 4-TERMINAL TO-3 METAL CAN K - PACKAGE Part No. SM645K SM645HRK SM646K SM646HRK SM647K SM647HRK (See Note Below) Ambient Temperature Range 0°C to 70°C -55°C to 125°C 0°C to 70°C -55°C to 125°C 0°C to 70°C -55°C to 125°C Connection Diagram DRIVE POSITIVE INPUT 3 4 1 CASE IS COMMON POSITIVE OUTPUT Note 1. All packages are viewed from the top. 2. Consult factory for additional screening available. LINFINITY 4/90 Rev 1.1 2/94 Copyright 1994 4 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570