A driver circuit suitable for use in an operational amplifier, includes a bipolar pull-up transistor which sources current to an output terminal in proportion to an applied drive current, and an MOS pull-down transistor which sinks current from the output terminal in proportion to an applied control voltage. An MOS drive transistor provides a constant drive current for the pull-up transistor, and an MOS shunt transistor shunts the drive current away from the bipolar transistor in proportion to the control voltage. A cross-over compensation circuit develops a predetermined bias voltage on the base of the bipolar transistor relative to the voltage on the output terminal, to assure a minimum level of operation of the bipolar transistor when the output terminal is near the analog ground voltage.