AT9933
Pin Description
Pin Number
1
2
7
3
4
5
6
8
Pin
VIN
CS1
CS2
GND
GATE
PWMD
VDD
REF
Description
This pin is the input of a 8 - 100V voltage regulator.
These pins are used to sense the input and output currents of the boost-buck converter.
They are the non-inverting inputs of the internal comparators.
Ground return for all the internal circuitry. This pin must be electrically connected to the
ground of the power train.
This pin is the output gate driver for an external N-channel power MOSFET.
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 drive output.
This is a power supply pin for all internal circuits. It must be bypassed to GND with a low
ESR capacitor greater than 0.1µF.
This pin provides accurate reference voltage. It must be bypassed with a 0.01 - 0.1µF
capacitor to GND.
Block Diagram
VIN
Regulator
Input Comparator
7.5V
VDD
CS1
100mV
GATE
0mV
CS2
Output Comparator
1.25V
REF
PWMD
GND
AT9933
4
SUPERTEX [ Supertex, Inc ]
