MC34152PG Dual MOSFET Driver 1.5A Peak Current 12V-18V Supply 50ns Rise/Fall DIP-8 -40°C to +85°C

MC34152PG Dual MOSFET Driver 1.5A Peak Current 12V-18V Supply 50ns Rise/Fall DIP-8 -40°C to +85°C

Features

• Two Independent Channels with 1.5 A Totem Pole Outputs

• Output Rise and Fall Times of 15 ns with 1000 pF Load

• CMOS/LSTTL Compatible Inputs with Hysteresis

• Undervoltage Lockout with Hysteresis

• Low Standby Current

• Efficient High Frequency Operation

• Enhanced System Performance with Common Switching Regulator Control ICs

• NCV Prefix for Automotive and Other Applications Requiring Site and Change Controls

• These are Pb−Free and Halide−Free Devices

DESCRIPTION

The MC34152/MC33152 are dual noninverting high speed drivers specifically designed for applications that require low current digital signals to drive large capacitive loads with high slew rates. These devices feature low input current making them CMOS/LSTTL logic compatible, input hysteresis for fast output switching that is independent of input transition time, and two high current totem pole outputs ideally suited for driving power MOSFETs. Also included is an undervoltage lockout with hysteresis to prevent system erratic operation at low supply voltages.

Typical applications include switching power supplies, dc−to−dc converters, capacitor charge pump voltage doublers/inverters, and motor controllers.

This device is available in dual−in−line and surface mount packages.

Input Stage

The Logic Inputs have 170 mV of hysteresis with the input threshold centered at 1.67 V. The input thresholds are insensitive to VCC making this device directly compatible with CMOS and LSTTL logic families over its entire operating voltage range. Input hysteresis provides fast output switching that is independent of the input signal transition time, preventing output oscillations as the input thresholds are crossed. The inputs are designed to accept a signal amplitude ranging from ground to VCC. This allows the output of one channel to directly drive the input of a second channel for master−slave operation. Each input has a 30 k pulldown resistor so that an unconnected open input will cause the associated Drive Output to be in a known low state.

Output Stage

Each totem pole Drive Output is capable of sourcing and sinking up to 1.5 A with a typical ‘on’ resistance of 2.4 at 1.0 A. The low ‘on’ resistance allows high output currents to be attained at a lower VCC than with comparative CMOS drivers. Each output has a 100 k pulldown resistor to keep the MOSFET gate low when VCC is less than 1.4 V. No over current or thermal protection has been designed into the device, so output shorting to VCC or ground must be avoided.

Parasitic inductance in series with the load will cause the driver outputs to ring above VCC during the turn−on transition, and below ground during the turn−off transition. With CMOS drivers, this mode of operation can cause a destructive output latchup condition. The MC34152 is immune to output latchup. The Drive Outputs contain an internal diode to VCC for clamping positive voltage transients. When operating with VCC at 18 V, proper power supply bypassing must be observed to prevent the output ringing from exceeding the maximum 20 V device rating. Negative output transients are clamped by the internal NPN pullup transistor. Since full supply voltage is applied across the NPN pullup during the negative output transient, power dissipation at high frequencies can become excessive. Figures 19, 20, and 21 show a method of using external Schottky diode clamps to reduce driver power dissipation.

INFORMATION

Drawing

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