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SM645/SM646/SM647 SWITCHING REGULATOR POWER OUTPUT STAGES
DESCRIPTION
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.
FEATURES
* 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
4/90 Rev 1.1 2/94
Copyright (c) 1994
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
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 SM646 80V 80v 5V 15A 20A -0.4A SM647 100V 100V 5V 15A 20A -0.4A
Thermal Resistance Power Switch, J - C ................................................... 2.0C/W Commutating Diode ................................................. 2.0C/W Case to Ambient, C - A ............................................ 30.0C/W
Note 1. Exceeding these ratings could cause damage to the device.
Operating Junction Temperature Hermetic (K Package) .................................................. 150C Storage Temperature Range ............................. -65C to 150C Lead Temperature (Soldering, 10 Seconds) ................... 300C
THERMAL DATA
K Package: Thermal Resistance-Junction to Case, JC .................. 2.0C/W Thermal Resistance-Junction to Ambient, JA .............. 35C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x JA). Note B. The above numbers for JC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
(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 ....................................................... 0C to 70C SM6XXHRK ............................................ -55C to 125C
Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply for the operating ambient temperature of TA = 25C. 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 = 125C V1 = Rated output voltage V1 = Rated output voltage, TA = 125C
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 A A A A
Note 3. Pulse test: Duration = 300s, Duty Cycle 2%.
4/90 Rev 1.1 2/94
Copyright (c) 1994
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SM645/SM646/SM647
ELECTRICAL CHARACTERISTICS
Parameter
(continued)
Test Conditions
SG645/646/647 Min. Typ. Max. 35 65 40 700 70 175 85 60 150 60 175 300
Units 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
(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
4/90 Rev 1.1 2/94
Copyright (c) 1994
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SM645/SM646/SM647
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
4-TERMINAL TO-3 METAL CAN K - PACKAGE (See Note Below)
Part No. SM645K SM645HRK SM646K SM646HRK SM647K SM647HRK
Ambient Temperature Range 0C to 70C -55C to 125C 0C to 70C -55C to 125C 0C to 70C -55C to 125C
Connection Diagram
DRIVE
3 4
POSITIVE INPUT
1
CASE IS COMMON
POSITIVE OUTPUT
Note 1. All packages are viewed from the top. 2. Consult factory for additional screening available. 4/90 Rev 1.1 2/94
Copyright (c) 1994
4
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.

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