TC4404/TC4405 M 1.5A Dual Open-Drain MOSFET Drivers Features General Description Independently Programmable Rise and Fall The TC4404/TC4405 are CMOS buffer-drivers Times constructed with complementary MOS outputs, where the drains of the totem-pole output have been left Low Output Impedance 7 Typ. separated so that individual connections can be made High Speed t , t <30nsec with 1000pF Load R F to the pull-up and pull-down sections of the output. This Short Delay Times <30nsec allows the insertion of drain-current-limiting resistors in Wide Operating Range the pull-up and/or pull-down sections, allowing the user - 4.5V to 18V to define the rates of rise and fall for a capacitive load or a reduced output swing, if driving a resistive load, or Latch-Up Protected: Will Withstand > 500mA to limit base current, when driving a bipolar transistor. Reverse Current (Either Polarity) Minimum rise and fall times, with no resistors, will be Input Withstands Negative Swings Up to -5V less than 30nsec for a 1000pF load. Applications For driving MOSFETs in motor-control applications, where slow-ON/fast-OFF operation is desired, these Motor Controls devices are superior to the previously used technique Driving Bipolar Transistors of adding a diode-resistor combination between the Driver for Non-overlapping Totem Poles driver output and the MOSFET, because they allow Reach-Up/Reach-Down Driver accurate control of turn-ON, while maintaining fast turn- OFF and maximum noise immunity for an OFF device. Device Selection Table When used to drive bipolar transistors, these drivers maintain the high speeds common to other Microchip Part Number Package Temp. Range drivers. They allow insertion of a base current-limiting TC4404COA 8-Pin SOIC 0C to +70C resistor, while providing a separate half-output for fast turn-OFF. By proper positioning of the resistor, either TC4404CPA 8-Pin PDIP 0C to +70C npn or pnp transistors can be driven. TC4404EOA 8-Pin SOIC -40C to +85C For driving many loads in low-power regimes, these TC4404EPA 8-Pin PDIP -40C to +85C drivers, because they eliminate shoot-through currents TC4404MJA 8-Pin CERDIP -55C to +125C in the output stage, require significantly less power at TC4405COA 8-Pin SOIC 0C to +70C higher frequencies, and can be helpful in meeting low-power budgets. TC4405CPA 8-Pin PDIP 0C to +70C TC4405EOA 8-Pin SOIC -40C to +85C TC4405EPA 8-Pin PDIP -40C to +85C TC4405MJA 8-Pin CERDIP -55C to +125C Package Type 8-Pin PDIP/SOIC/CERDIP V V DD 1 8 A TOP DD 1 8 A TOP IN A 2 7 A BOTTOM IN A 2 7 A BOTTOM TC4404 TC4404 IN B 3 6 B TOP IN B 3 6 B TOP GND 4 5 B BOTTOM GND 4 5 B BOTTOM V V DD18 A TOP DD18 A TOP IN A27 A BOTTOM IN A27 A BOTTOM TC4405 TC4405 IN B36 B TOP IN B36 B TOP GND45 B BOTTOM GND45 B BOTTOM 2002 Microchip Technology Inc. DS21418B-page 1TC4404/TC4405 Because neither drain in an output is dependent on the These devices are built to operate in the most demand- other, these devices can also be used as open-drain ing electrical environments. They will not latch up under buffer/drivers where both drains are available in one any conditions within their power and voltage ratings device, thus minimizing chip count. Unused open they are not subject to damage when up to 5V of noise drains should be returned to the supply rail that their spiking of either polarity occurs on their ground pin and device sources are connected to (pull-downs to they can accept, without damage or logic upset, up to ground, pull-ups to V ), to prevent static damage. In 1/2 amp of reverse current (of either polarity) being DD addition, in situations where timing resistors or other forced back into their outputs. All terminals are fully means of limiting crossover currents are used, like protected against up to 2kV of electrostatic discharge. drains may be paralleled for greater current carrying capacity. Functional Block Diagram 1 V DD TC4404 Inverting 8 (6) 300 mV Pull Up 7 (5) Pull Down 2 (3) Input TC4405 Noninverting 4.7V 4 GND A (B) Effective Input C 12 pF DS21418B-page 2 2002 Microchip Technology Inc.