2-2

Pin Descriptions

PIN

SYMBOL

FUNCTION

DESCRIPTION

1

VCC

Bias Supply

Connect this pin to either a 12V or a 5V source. The HIP1020 detects the bias-voltage level at

pin 1 and decides whether to operate as a voltage-doubler or a voltage-tripler. Consequently,

it is not recommended to operate with bias voltages between 5V (

±10%) and 12V (±10%). In

the absence of an enable signal at pin 5, the current into pin 1 is less than 1

µA. It is necessary

for voltage to be present at pin 1 prior to applying an enable signal at pin 5.

2

GND

Ground

Connect to the negative rail of the supply that is connected to pin 1.

3

LGATE

Gate Driver for the 5V

and/or 3.3V

MOSFET(s)

When VCC = 12V, connect this pin to the gate(s) of the 5V and/or 3.3V MOSFETs. When VCC

= 5V, connect this pin to the gate of a 3.3V MOSFET. Upon a rising edge on EN (pin 5), the

voltage on this pin will ramp linearly to ~16V when VCC = 12V and ~12V when VCC = 5V. An

internal dv/dt activated clamp shunts coupled noise to ground preventing unintended turn on at

either output. The internal dv/dt-activated clamp also protects pin 5.

4

HGATE

12V or 5V MOSFET

Gate Driver

When VCC = 12V, connect this pin to the gate of the 12V MOSFET. When VCC = 5V, connect

this pin to the gate of the 5V MOSFET. Upon a rising edge on EN (pin 5), the voltage on this

pin will ramp linearly to ~22V when VCC = 12V and ~13V when VCC = 5V.

5

EN

Enable

Connect a TTL or 3.3V logic signal to this pin to control the outputs at pins 3 and 4. A rising

edge on pin 5 initiates the linear voltage ramps at pins 3 and 4. Be sure that the device driving

EN does not enter a high-impedance state when enabling is not desired and that it’s maximum

rise time does not exceed 100

µs.

HIP1020