In the Functional Block Diagram of the HIP4020, the four
switches and a load are arranged in an H-Configuration so
that the drive voltage from terminals OUTA and OUTB can
be cross-switched to change the direction of current flow in
the load. This is commonly known as 4-quadrant load
control. As shown in the Block Diagram, switches Q1 and Q4
are conducting or in an ON state when current flows from
VDD through Q1 to the load, and then through Q4 to terminal
VSSB; where load terminal OUTA is at a positive potential
with respect to OUTB. Switches Q1 and Q4 are operated
synchronously by the control logic. The control logic
switches Q3 and Q2 to an open or OFF state when Q1 and
Q4 are switched ON. To reverse the current flow in the load,
the switch states are reversed where Q1 and Q4 are OFF
while Q2 and Q3 are ON. Consequently, current then flows
from VDD through Q3, through the load, and through Q2 to
terminal VSSA, and load terminal OUTB is then at a positive
potential with respect to OUTA.
Terminals ENA and ENB are ENABLE Inputs for the Logic A
and B Input Controls. The ILF output is an Overcurrent Limit
Fault Flag Output and indicates a fault condition for either
Output A or B or both. The VDD and VSS are the Power
Supply reference terminals for the A and B Control Logic
Inputs and ILF Output. While the VDD positive power supply
terminal is internally connected to each bridge driver, the
VSSA and VSSB Power Supply terminals are separate and
independent from VSS and may be more negative than the
VSS ground reference terminal. The use of level shifters in
the gate drive circuitry to the NMOS (low-side) output stages
allows controlled level shifting of the output drive relative to
ground.

Features
• Two Independent Controlled Complementary MOS Power
Output Half H-Drivers (Full-Bridge) for Nominal 3V to 12V
Power Supply Operation
• Split Voltage Power Supply Option for Output Drivers
• Load Switching Capabilities to 0.5A
• Single Supply Range +2.5V to +15V
• Low Standby Current
• CMOS/TTL Compatible Input Logic
• Over-Temperature Shutdown Protection
• Overcurrent Limit Protection
• Overcurrent Fault Flag Output
• Direction, Braking and PWM Control
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications
• DC Motor Driver
• Relay and Solenoid Drivers
• Stepper Motor Controller
• Air Core Gauge Instrument Driver
• Speedometer Displays
• Tachometer Displays
• Remote Power Switch
• Battery Operated Switch Circuits
• Logic and Microcontroller Operated Switch