Quad, High-Side MOSFET Drivers

The MAX620/MAX621 incorporate four MOSFET drivers and a charge-pump high-side power supply to power high-side switching and control circuits. The charge pump delivers a regulated output voltage 11V greater than VCC to the drivers, which then translate a TTL/CMOS input signal to a noninverted output that swings from ground to the high-side voltage. The out­puts drive N-channel FETs in high-side or low-side switching applications, including a wide range of line­and battery-powered applications.

The MAX620/MAX621 are microprocessor compatible and feature undervoltage lockout capability. This lockout feature inhibits the FET driver outputs until the high-side voltage reaches the proper level, as indicated by a Power-Ready output.

The MAX620 requires three inexpensive charge-pump capacitors. The MAX621 has internal capacitors-no external components are needed.

APPLICATIONS

* Portable Computer Battery Load Management

* High-Side Power, N-Channel MOSFET Switching

* Low-Side Switching from Low Supply Voltages Quad-Latching Level Translators

* H-Bridge Motor Drivers

* Stepper Motor Drivers

* Wide Operating Voltage Range

* Minimum Component Count

* Output Voltage Regulated to VCC Plus 11V (Typ)

* Low Quiescent Current - 70µA (Typ)