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SM625/SM626/SM627
SWITCHING REGULATOR POWER OUTPUT STAGES
DESCRIPTION
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.
FEATURES
* 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
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.
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) .................................................. 150C Power Switch, J - C ................................................... 4.0C/W Storage Temperature Range ............................. -65C to 150C Commutating Diode .................................................. 4.0C/W Lead Temperature (Soldering, 10 Seconds) ....................300C Case to Ambient, C - A ............................................ 60.0C/W
Note 1. Exceeding these ratings could cause damage to the device.
THERMAL DATA
R Package: Thermal Resistance-Junction to Case, JC .................. 4.0C/W Thermal Resistance-Junction to Ambient, JA .............. 40C/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)
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 ....................................................... 0C to 70C SM6XXHRR ........................................... -55C to 125C
Note 2. Range over which the device is functional.
SM627 90V 90V 4V 13A -0.3A
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
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 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.
SM625/SM626/SM627
ELECTRICAL SPECIFICATIONS
Parameter
(continued)
Test Conditions
SG625/626/627 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)
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
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.
SM625/SM626/SM627
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
4-PIN TO-66 METAL CAN R - PACKAGE (See Note Below)
Part No. SM625R SM625HRR SM626R SM626HRR SM627R SM627HRR
Ambient Temperature Range 0C to 70C -55C to 125C 0C to 70C -55C to 125C 0C to 70C -55C to 125C
Connection Diagram
POSITIVE OUTPUT
1 2 4 3
POSITIVE INPUT
COMMON
DRIVE
Note 1. All packages are viewed from the top. 2. Case is electrically isolated. 3. Contact 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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