SM625/SM626/SM627 SWITCHING REGULATOR POWER OUTPUT STAGES DESCRIPTION FEATURES The SM625/626/627 series of Power Output Stages are especially designed to be driven with standard PWM integrated circuits to form an efficient switching power supply. The SM625, SM626 and SM627 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 625, 626, 627 • 15A current capability • Designed and characterized for switching regulator applications such as Buck, Boost, and Buck-Boost type • 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% • Electrically isolated, 4-pin, TO-66 hermetic case HIGH RELIABILITY FEATURES ♦ Available with high reliability processing FUNCTIONAL DIAGRAM SM625/SM626/SM627 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 SM625/SM626/SM627 ABSOLUTE MAXIMUM RATINGS (Note 1) SM625 SM626 SM627 Input Voltage, V 4 - 2 ......................................... 60V 80V 100V 80V 100V Output Voltage, V1 - 2 ...................................... 60V Drive Input Reverse Voltage, V3 - 4 ................. 5V 5V 5V 15A 15A Output Current, I 1 .......................................... 15A Drive Current, I 3 ............................................. -0.4A -0.4A -0.4A Thermal Resistance Operating Junction Temperature Hermetic (R Package) .................................................. 150°C Power Switch, θJ - C ................................................... 4.0°C/W Storage Temperature Range ............................. -65°C to 150°C Commutating Diode .................................................. 4.0°C/W Lead Temperature (Soldering, 10 Seconds) ....................300°C Case to Ambient, θ C - A ............................................ 60.0°C/W Note 1. Exceeding these ratings could cause damage to the device. THERMAL DATA R Package: Thermal Resistance-Junction to Case, θJC .................. 4.0°C/W Thermal Resistance-Junction to Ambient, θJA .............. 40°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) SM625 SM626 Input Voltage, V4 - 2 ......................................... 50V 70V Output Voltage, V1 - 2 ...................................... 50V 70V 4V Drive Input Reverse Voltage, V3 - 4 ................. 4V Output Current, I1 .......................................... 13A 13A -0.3A Drive Current, I3 ............................................. -0.3A Operating Ambient Temperature Range SM6XXR ....................................................... 0°C to 70°C SM6XXHRR ........................................... -55°C to 125°C SM627 90V 90V 4V 13A -0.3A 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 SG625/626/627 Min. Typ. Max. 1.5 1.0 3.5 2.5 0.85 1.25 0.95 1.75 10 0.1 10 10 1.0 500 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 SM625/SM626/SM627 ELECTRICAL SPECIFICATIONS (continued) Parameter Test Conditions SG625/626/627 Min. Typ. Max. Units 35 65 40 700 70 175 85 ns ns ns ns ns ns % 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 60 150 60 175 300 (Note 6) SM625 SM626 SM627 FIGURE 1 - SM625/626/627 SWITCHING SPEED CIRCUIT FIGURE 2 - SM625/626/627 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 SM62X SM62X 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 SM625/SM626/SM627 CONNECTION DIAGRAMS & ORDERING INFORMATION Package 4-PIN TO-66 METAL CAN R - PACKAGE Part No. SM625R SM625HRR SM626R SM626HRR SM627R SM627HRR (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 POSITIVE OUTPUT COMMON POSITIVE INPUT 1 4 2 3 DRIVE Note 1. All packages are viewed from the top. 2. Case is electrically isolated. 3. Contact 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