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SG1626/SG2626/SG3626
DUAL HIGH SPEED DRIVER
DESCRIPTION
The SG1626, 2626, 3626 is a dual inverting monolithic high speed driver that is pin for pin compatible with the DS0026, TSC426 and ICL7667. This device utilizes high voltage Schottky logic to convert TTL signals to high speed outputs up to 18V. The totem pole outputs have 3A peak current capability, which enables them to drive 1000pF loads in typically less than 25ns. These speeds make it ideal for driving power MOSFETs and other large capacitive loads requiring high speed switching. In addition to the standard packages, Silicon General offers the 16 pin S.O.I.C. (DW-package) for commercial and industrial applications, and the Hermetic TO-66 (R-package) for military use. These packages offer improved thermal performance for applications requiring high frequencies and/or high peak currents.
FEATURES
* Pin for pin compatible with DS0026, TSC426 and ICL7667. * Totem pole outputs with 3.0A peak current capability. * Supply voltage to 22V. * Rise and fall times less than 25ns. * Propagation delays less than 20ns. * Inverting high-speed high-voltage Schottky logic. * Efficient operation at high frequency. * Available in: 8 Pin Plastic and Ceramic DIP 14 Pin Ceramic DIP 16 Pin Plastic S.O.I.C. 20 Pin LCC TO-99 TO-66
HIGH RELIABILITY FEATURES - SG1626
Available to MIL-STD-883 Radiation data available LMI level"S" processing available
EQUIVALENT CIRCUIT SCHEMATIC
VCC
6.5V VREG
2.5K
3K
INV. INPUT
OUTPUT
GND
9/91 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.
SG1626/SG2626/SG3626
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (VCC) ........................................................... 22V Logic Input Voltage ............................................................... 7V Source/Sink Output Current (Each Output) Continuous ................................................................... 0.5A Pulse, 500ns ................................................................ 3.0A Operating Junction Temperature Hermetic (J, T, Y, R-Packages) ................................... 150C Plastic (M, DW, L-Packages) ....................................... 150C Storage Temperature Range ............................ -65C to 150C Lead Temperature (Soldering, 10 Seconds) ................... 300C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to ground. All currents are positive into the specified terminal.
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC .................. 30C/W Thermal Resistance-Junction to Ambient, JA .............. 80C/W Y Package: Thermal Resistance-Junction to Case, JC .................. 50C/W Thermal Resistance-Junction to Ambient, JA ............ 130C/W M Package: Thermal Resistance-Junction to Case, JC .................. 60C/W Thermal Resistance-Junction to Ambient, JA ............. 95C/W DW Package: Thermal Resistance-Junction to Case, JC .................. 40C/W Thermal Resistance-Junction to Ambient, JA .............. 95C/W T Package: Thermal Resistance-Junction to Case, JC .................. 25C/W Thermal Resistance-Junction to Ambient, JA ........... 130C/W R Package: Thermal Resistance-Junction to Case, JC ................. 5.0C/W Thermal Resistance-Junction to Ambient, JA ............. 40C/W L Package: Thermal Resistance-Junction to Case, JC .................. 35C/W Thermal Resistance-Junction to Ambient, JA ........... 120C/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)
Supply Voltage (VCC) .................................. 4.5V to 20V (Note 3) Frequency Range ............................................... DC to 1.5MHz Peak Pulse Current ............................................................ 3A Logic Input Voltage ................................................ -0.5 to 5.5V
Note 2. Range over which the device is functional. Note 3. AC performance has been optimized for VCC = 8V to 20V.
Operating Ambient Temperature Range (TJ) SG1626 ......................................................... -55C to 125C SG2626 ........................................................... -25C to 85C SG3626 .............................................................. 0C to 70C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specfiications apply over the operating ambient temperatures for SG1626 with -55C TA 125C, SG2626 with 25C TA 85C, SG3626 with 0C TA 70C, and VCC = 20V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter Static Characteristics Logic 1 Input Voltage Logic 0 Input Voltage Input High Current Input High Current Input Low Current Input Clamp Voltage Output High Voltage (Note 4) Output Low Voltage (Note 4) Supply Current Outputs Low Supply Current Outputs High
Note 4. VCC = 10V to 20V.
Test Conditions
SG1626/2626/3626 Units Min. Typ. Max. 2.0 V V A mA mA V V V mA mA
VIN = 2.4V VIN = 5.5V VIN = 0V IIN = -10mA IOUT = -200mA IOUT = 200mA VIN = 2.4V (both inputs) VIN = 0V (both inputs)
0.7 500 1.0 -4 -1.5 VCC-3 18 7.5 1.0 27 12
9/91 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.
SG1626/SG2626/SG3626
ELECTRICAL CHARACTERISTICS
Parameter Dynamic Characteristics (Note 6) Propagation Delay High-Low (TPHL) Propagation Delay Low-High (TPLH) Rise Time (TTLH) Fall Time (TTHL) Supply Current (ICC)
(both outputs) (continued)
SG1626/2626/3626 Test Conditions (Figure 1)
TA= 25C
TA=-55C to 125C
SG1626
Units
Min. Typ. Max. Min. Typ. Max. CL = 1000pF (Note 5) CL = 2500pF CL = 1000pF (Note 5) CL = 2500pF CL = 1000pF (Note 5) CL = 2500pF CL = 1000pF (Note 5) CL = 2500pF CL = 2500pF, Freq. = 200KHz Duty Cycle = 50% 18 25 25 35 30 40 20 40 35 30 40 40 50 35 50 30 50 40 ns ns ns ns ns ns ns ns mA
17 25 30 30 30
Note 5. These parameters, specified at 1000pF, although guaranteed over recommended operating conditions, are not 100% tested in production. Note 6. VCC = 15V.
AC TEST CIRCUIT AND SWITCHING TIME WAVEFORMS - FIGURE 1
SG1626
CHARACTERISTIC CURVES
FIGURE 2. TRANSITION TIMES VS. SUPPLY VOLTAGE
FIGURE 3. PROPAGATION DELAY VS. SUPPLY VOLTAGE
FIGURE 4. TRANSITION TIMES VS. AMBIENT TEMPERATURE
9/91 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.
SG1626/SG2626/SG3626
CHARACTERISTIC CURVES
(continued)
FIGURE 5. PROPAGATION DELAY VS. AMBIENT TEMPERATURE
FIGURE 6. TRANSITION TIMES VS. CAPACITIVE LOAD
FIGURE 7. SUPPLY CURRENT VS. CAPACITANCE LOAD
FIGURE 8. HIGH SIDE SATURATION VS. OUTPUT CURRENT
FIGURE 9. LOW SIDE SATURATION VS. OUTPUT CURRENT
FIGURE 10. SUPPLY CURRENT VS. FREQUENCY
FIGURE 11. SUPPLY CURRENT VS. FREQUENCY
9/91 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.
SG1626/SG2626/SG3626
APPLICATION INFORMATION
POWER DISSIPATION The SG1626, while more energy-efficient than earlier gold-doped driver IC's, can still dissipate considerable power because of its high peak current capability at high frequencies. Total power dissipation in any specific application will be the sum of the DC or steady-state power dissipation, and the AC dissipation caused by driving capacitive loads. The DC power dissipation is given by: PDC = +VCC * ICC [1] where ICC is a function of the driver state, and hence is duty-cycle dependent. The AC power dissipation is proportional to the switching frequency, the load capacitance, and the square of the output voltage. In most applications, the driver is constantly changing state, and the AC contribution becomes dominant when the frequency exceeds 100-200KHz. The SG1626 driver family is available in a variety of packages to accommodate a wide range of operating temperatures and power dissipation requirements. The Absolute Maximums section of the data sheet includes two graphs to aid the designer in choosing an appropriate package for his design. The designer should first determine the actual power dissipation of the driver by referring to the curves in the data sheet relating operating current to supply voltage, switching frequency, and capacitive load. These curves were generated from data taken on actual devices. The designer can then refer to the Absolute Maximum Thermal Dissipation curves to choose a package type, and to determine if heat-sinking is required. DESIGN EXAMPLE Given: Two 2500 pF loads must be driven push-pull from a +15 volt supply at 100KHz. This is a commercial application where the maximum ambient temperature is +50C, and cost is important. 1. From Figure 11, the average driver current consumption under these conditions will be 18mA, and the power dissipation will be 15volts x 18mA, or 270mW. 2. From the Ambient Thermal Characteristic curve, it can be seen that the M package, which is an 8-pin plastic DIP with a copper lead frame, has more than enough thermal conductance from junction to ambient to support operation at an ambient temperature of +50C. The SG3626M driver would be specified for this application. SUPPLY BYPASSING Since the SG1626 can deliver peak currents above 3amps under some load conditions, adequate supply bypassing is essential for proper operation. Two capacitors in parallel are recommended to guarantee low supply impedance over a wide bandwidth: a 0.1F ceramic disk capacitor for high frequencies, and a 4.7F solid tantalum capacitor for energy storage. In military applica9/91 Rev 1.1 2/94
Copyright (c) 1994
tions, a CK05 or CK06 ceramic operator with a CSR-13 tantalum capacitor is an effective combination. For commercial applications, any low-inductance ceramic disk capacitor teamed with a Sprague 150D or equivalent low ESR capacitor will work well. The capacitors must be located as close as physically possible to the VCC pin, with combined lead and pc board trace lengths held to less than 0.5 inches. GROUNDING CONSIDERATIONS Since ground is both the reference potential for the driver logic and the return path for the high peak output currents of the driver, use of a low-inductance ground system is essential. A ground plane is highly recommended for best performance. In dense, high performance applications a 4-layer pc board works best; the 2 inner planes are dedicated to power and ground distribution, and signal traces are carried by the outside layers. For costsensitive designs a 2-layer board can be made to work, with one layer dedicated completely to ground, and the other to power and signal distribution. A great deal of attention to component layout and interconnect routing is required for this approach. LOGIC INTERFACE The logic input of the 1626 is designed to accept standard DCcoupled 5 volt logic swings, with no speed-up capacitors required. If the input signal voltage exceeds 6 volts, the input pin must be protected against the excessive voltage in the HIGH state. Either a high speed blocking diode must be used, or a resistive divider to attenuate the logic swing is necessary. LAYOUT FOR HIGH SPEED The SG1626 can generate relatively large voltage excursions with rise and fall times around 20-30 nanoseconds with light capacitive loads. A Fourier analysis of these time domain signals will indicate strong energy components at frequencies much higher than the basic switching frequency. These high frequencies can induce ringing on an otherwise ideal pulse if sufficient inductance occurs in the signal path (either the positive signal trace or the ground return). Overshoot on the rising edge is undesirable because the excess drive voltage could rupture the gate oxide of a power MOSFET. Trailing edge undershoot is dangerous because the negative voltage excursion can forwardbias the parasitic PN substrate diode of the driver, potentially causing erratic operation or outright failure. Ringing can be reduced or eliminated by minimizing signal path inductance, and by using a damping resistor between the drive output and the capacitive load. Inductance can be reduced by keeping trace lengths short, trace widths wide, and by using 2oz. copper if possible. The resistor value for critical damping can be calculated from: RD = 2L/CL [2] where L is the total signal line inductance, and CL is the load capacitance. Values between 10 and 100ohms are usually sufficient. Inexpensive carbon composition resistors are best because they have excellent high frequency characteristics. They should be located as close as possible to the gate terminal of the power MOSFET.
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11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1626/SG2626/SG3626
TYPICAL APPLICATIONS
FIGURE 12. When the SG3626 is driven from a totem-pole source with a peak output greater than 6 volts, a low-current, fast-switching blocking diode is required at each logic input for protection. In this push-pull converter, the inverted logic outputs of the 3527A are ideal control sources for the power driver.
FIGURE 13. In this forward converter circuit, the control capabilities of the SG3524B PWM are combined with the powerful totem-pole drivers found in the SG3626. This inexpensive configuration results in very fast charge and discharge of the power MOSFET gate capacitance for efficient swithing.
9/91 Rev 1.1 2/94
Copyright (c) 1994
6
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1626/SG2626/SG3626
TYPICAL APPLICATIONS
(continued)
FIGURE 14. In half or full-bridge power supplies, driving the isolation transformers directly from the PWM can cause excessive IC temperatures, expecially above 100KHz. This circuit uses the high drive capacity of the SG3626 to solve the problem.
FIGURE 15. A low-impedance resistive divider network can also be used as the interface between the PWM high-voltage logic output and the SG3626 power driver. In this 200KHz current mode converter, the SG3847 provides control, while the SG3626 provides high power drive and minimizes ground spiking in the control IC.
9/91 Rev 1.1 2/94
Copyright (c) 1994
7
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1626/SG2626/SG3626
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
14-PIN CERAMIC DIP J - PACKAGE (See Notes Below)
Part No. SG1626J/883B SG1626J/DESC SG1626J SG2626J SG3626J
Ambient Temperature Range -55C to 125C -55C to 125C -55C to 125C -25C to 85C 0C to 70C
Connection Diagram
N.C. N.C. OUT A N.C. IN A N.C. GROUND
1 2 3 4 5 6 7 14 13 12 11 10 9 8
VCC N.C. OUT B N.C. IN B N.C. N.C.
8-PIN CERAMIC DIP Y - PACKAGE
SG1626Y/883B SG1626Y/DESC SG1626Y SG2626Y SG3626Y SG2626M SG3626M SG2626DW SG3626DW
-55C to 125C -55C to 125C -55C to 125C -25C to 85C 0C to 70C -25C to 85C 0C to 70C -25C to 85C 0C to 70C
N.C. IN A GROUND IN B
1 2 3 4
8 7 6 5
N.C. OUT A VCC OUT B
8-PIN PLASTIC DIP M - PACKAGE 16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE
N.C. IN A N.C. GROUND GROUND N.C. IN B N.C.
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
N.C. OUT A VCC GROUND GROUND VCC OUT B N.C.
8-PIN TO-99 METAL CAN T - PACKAGE
SG1626T/883B SG1626T/DESC SG1626T SG2626T SG3626T
-55C to 125C -55C to 125C -55C to 125C -25C to 85C 0C to 70C
VCC OUT A
1 8 7 6 3 5 4
OUT B
N.C. 2 IN A
N.C.
IN B
GND
5-PIN TO-66 METAL CAN R - PACKAGE
SG1626R/883B SG1626R/DESC SG1626R SG2626R SG3626R
-55C to 125C -55C to 125C -55C to 125C -25C to 85C 0C to 70C
VCC
3
OUT B IN B
4 5 1
2
OUT A IN A CASE IS GROUND Note: Case and tab are internally connected to substrate ground.
20-PIN CERAMIC (LCC) LEADLESS CHIP CARRIER L- PACKAGE
SG1626L/883B
-55C to 125C
(Note 4)
1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
N.C. GROUND N.C. IN A N.C. GROUND N.C. IN B N.C. GROUND
3 4 5 6 7 8 9
2
1
20 19 18 17 16 15 14
10 11 12 13
11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
N.C. N.C. OUT B N.C. Vcc N.C. Vcc N.C. OUT A N.C.
Note 1. Contact factory for JAN and DESC product availablity. 2. All packages are viewed from the top. 9/91 Rev 1.1 2/94
Copyright (c) 1994 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
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