19-0862; Rev 0; 2/89 MA MALSVI Dual Power MOSFET Driver General Description The ICL7667 is a dual monolithic power MOSFET driver designed to translate TTL inputs to high voltage/current outputs. Its low delay and transition times make it ideal to drive power MOSFETs for switching power supplies, motor controllers, and DC-DC converters. The |CL7667s CMOS output stage drives within millivolts of the supply rail, allowing the power MOSFETs their minimum ON resistance. The ICL7667's high speed minimizes power losses in switching power supplies and DC-DC con- verters due to rapid charging/discharging of the gate capacitance of the power MOSFETs. The ICL7667 inputs are TTL compatible, enabling direct interface to common switched mode power supply controllers. Features @ Fast Rise and Fall Times Typically 20ns with1000pF Load @ Wide Supply Range: Vpp = 4.5V to 17V @ Low Power Consumption: 6mW with Inputs Low 120mW with Inputs High @ TTL/CMOS Input Compatible @ Low Rout - Typically 4Q @ Pin Equivalent to DS0026/DS0056, TSC 426, $G1626/SG2626/SG3626 Applications Ordering Information Switching Power Supplies | PART TEMP. RANGE PACKAGE _ DC-DC Converters ICL7667CBA 0C to +70C 8 Lead SO - Motor Controllers ICL7667CPA OC to +70C 8 Lead Plastic DIP \CL7667CJA OCto +70C = 8 Lead CERDIP Pin Diode Drivers ICL7667MJA -55Cto +125C 8 Lead CERDIP Functional Diagram Pin Configuration Top View MAXLA o Vv = nc. [1 | la | NC Na (2| Anaxiaa |7 Jour ICL 7667 env [ 3| 6 | Voo INp [4 | 5 | OUTs Maxim Integrated Products 1 For free samples & the latest literature: http:/;www.maxim-ic.com, or phone 1-800-998-8800 Z99ZTOIICL7667 Dual Power MOSFET Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage Vpp toGND.. 0. 18V Maximum Chip Temperature... . rn + 150C Input Voltage ..... bccn eee Vop +0.3V to GND -0.3V Storage Temperature ........0............ -55C to 160C Package Dissipation Lead Temperature (Soldering 10 seconds) .......... +300"C (derate linearly above 50C by 5.5mW/*C) Plastic Dip .......... Cv vee ve etvenes . 300mW Small Outline... 0... eee 200mW CERDIP..............4.. Stee 400mWw operation of the device at these or any other conditions above those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect the device reliability. ELECTRICAL CHARACTERISTICS (Vop = 15V, Over Temperature, unless otherwise noted.) r OUTPUT OV [ PARAMETER SYMBOL CONDITIONS MIN. TYP MAX | UNITS | Logic 1 Input Voltage Vin Vop = 4.5V to 17V 2.0 Logic 0 Input Voltage Vit Voo = 4.5V to 17V 0.8 | Vv Inout Current hin Vin = OV to 15V -0.1 01 uA Output High Voltage Vou Vobp = 15V, No load 14.95 Vv Output Low Voltage Vou Vop = 15V, No load 0.05 Vv Vin = Vic. lout = +10MA,Ta = 25C 4 10 | | Vin = Vin, lout = -10MA, Ta = 25C 4 12 Output Resistance Rout Vin = Vi. lour = +10mA 6 12 Q | Vin = Vin, lout = -10MA 6 13 | Vin = +3V, both inputs, Ta = 25C ? | Vin = OV, both inputs, Ta = 25C 0.4 Power Supply Current loo Vin = +3V, both inputs 8 | mA | Vin = OV, both inputs 0.4 _| - tor Figure 1, CLoao = INF, Ta = 25C 20 30 Delay Time (Note 1 Figure 1. Cloap = 1nF 25 40 | : to2 Figure 1, CLoap = InF, Ta = 25C 25 50 Delay Time (Note 1) Figure 1, CLoap = 1nF 30 60 | ns | . ta Figure 1, CLoap = 1nF, Ta = 25C 20 30 | Rise Time (Note 1) Figure 1, Cloap = 1nF 25 40 | | . tr Figure 1, CLoap = 1nF, Ta = 25C 20 30 Fall Time (Note 1) | Figure 1, C.oap = 1nF 25 40 | Note 1: Switching times guaranteed by design, not tested. 1 vo ta 2 | INPUT 47uF 0 tpF | AAAXIAA = O4V ICL7667 | INPUT RISE AND INPUT e OUTPUT FALL TIMES < 5ns . bo | | Vv Poot C1 - 1000pF | J Figure 1, Test Circuit 2 MANXAI/VIDual Power MOSFET Driver Typical Operating Characteristics RISE AND FALL TIMES DELAY TIME VS. C, VS. TEMPERATURE RISE AND FALL TIMES VS. TEMPERATURE 1000 50 100 40 30 - 4 = RISE = = 20 a = Ez | TALL Vop = 15V | C. - 1nF 10 fo pee | Vop - 15V | | LL 10 100 1000 10K 100K 55 Q 425 70 +125 55 0 425 70 +125 LOAD CAPACITANCE (pF) TEMPERATURE (C) TEMPERATURE (C) NO LOAD Ipp lop VS. CL lpp VS. FREQUENCY VS. FREQUENCY 30 | | 200kH2 a _| __ 7 100 = a _ nH 10 _ er . | _ | <= <x [ me = E 10 } 8 | | Vop = 15V 2 Yoo = 15V 8 Vpp = 15 on | | ne ; tt ; | pm Von = SV | CL = 1nF 1 ; A. 1 10 100 1K 10K 10K 100K iM 10M 10K 100K iM 10M LOAD CAPACITANCE (pF) FREQUENCY (Hz) FREQUENCY (Hz) Introduction Circuit Description The ICL7667 is a dual inverting power MOSFET driver. Its delay times are nearly independent of Voo. The high current output inverters can rapidly charge and dis- charge the gate capacitance of even the largest power MOSFETs. Since the ICL7667's inputs are CMOS, very little current is required to interface to the ICL7667. Al- though the ICL7667 has an input that is easy to drive, the input must never be allowed to stay between Vin and Vit for more than 50ns. Other potential applications include charge pump volt- age inverters and charge pump voltage multipliers. MAXAI/VI The input stage of the ICL7667 consists of a large N channel transistor with a 2MA current source as 4 pull-up device. The second stage inverter has a feedback device to provide some hysteresis for cleaner input switching. The output stage is a very large inverter with separate gate drives to minimize crowbar current through the supplies. The simplicity of the circuit allows for very fast delay and switching times. Unused inputs should always be connected to ground to minimize supply current. Paralleling outputs can be done by tying both inputs together and tying both outputs together. Z99Z191ICL7667 Dual Power MOSFET Driver Supply Bypassing and Grounding Supply bypassing and grounding are extremely impor- tant with the ICL7667 product as the peak currents (both supply and output) are >1 amp. Ground drops are a form of negative feedback with inverters and will degrade the delay and transition time of the ICL7667. The suggested bypass Capacitors are a 4.7uF (low ESR) capacitor in paralle| with a 0. 1pF ceramic capacitor. These should be mounted as close as possible to the ICL7667. Use a ground plane if possible, or use separate ground returns for the inputs and outputs. Output Ringing Ringing is a common problem with large dV/dt and/or large AC currents. Some preventative suggestions are: 1.) Use asmail resistor 5-20Q in series with the output. (This will unfortunately degrade the output transition times); 2.) Reduce the inductance of the ground by using a ground plane; 3.) Use lower ESR capacitors to bypass the ICL7667. Power Dissipation The power dissipation of the |CL7667 consists of three parts: 1.) Input inverter losses; 2.) Crowbar current through the output devices; 3.) Output current (either capacitive or resistive). The sum of these is the total power dissipation and must be kept below the maximum power dissipation listed for the package. The Input inverter !osses come from the DC current in the input inverter. This current is O.4mA when both inputs are low and 4mA when both inputs are high. The Crowbar current through the output devices is the current glitch when the output is making a transition. This current is large (approximately 100mA) but lasts for only a few nanoseconds. It generally is a small portion of the total supply current unless the switching frequency is high and the capacitive load is very small (<100pF). The Output current can be resistive current (example, driving an LED) or capacitive current (example, driving the gate of a power MOSFET). The ICL7667 power when driving a ground referenced resistive load is: P = D x Roncmax) X lLoap where D is the percentage of time the ICL7667 output pulls high, Ronmaxy is the maximum on resistance of the ICL7667 with Vin = ViH, and ILoap is the load current flowing into the ICL7667. If the output load is capacitive, then the power is: P = Cioap x Von x FREQ where Cioao is the capacitive load, Vpo is the |CL7667 supply, and FREQ is the toggle frequency. Chip Topography INg OUTa 0.076" (1.93mm) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product, No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time 4 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 1989 Maxim Integrated Products Printed U.S.A. 19-862 5/89