AT9933

DS20005597A-page 6

 2016 Microchip Technology Inc.

2.0

PIN DESCRIPTION

The details on the pins of AT9933 are listed on

Table 2-1. Refer to Package Type for the location of

the pins.

TABLE 2-1:

PIN FUNCTION TABLE

Pin Number

Pin Name

Description

1

VIN

This pin is the input of an 8V–75V voltage regulator.

2

CS1

This pin is used to sense the input and output currents of the boost-buck converter. It is

a non-inverting input of the internal comparator.

3

GND

This is the ground return for all the internal circuitry. This pin must be electrically

connected to the ground of the power train.

4

GATE

This pin is the output gate driver for an external N-channel power Metal-oxide

Semiconductor Field-effect Transistor (MOSFET).

5

PWMD

When this pin is left open or pulled to GND, the gate driver is disabled. Pulling the pin to

a voltage greater than 2V will enable the gate driver output.

6

VDD

This is a power supply pin for all internal circuits. It must be bypassed to GND with a

low-ESR capacitor greater than 0.1 µF.

7

CS2

This pin is used to sense the input and output currents of the boost-buck converter. It is

a non-inverting input of the internal comparator.

8

REF

This pin provides accurate reference voltage. It must be bypassed with a

0.01 µF–0.1 µF capacitor to GND.