MIC28303 datasheet(19/38 Pages) MICROCHIP

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DS20005464A-page 19

MIC28303

3.0

PIN DESCRIPTIONS

Package Type

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

Pin Number

Symbol

Description

1, 2, 3, 54, 64

GND

Analog Ground. Ground for internal controller and feedback resistor network. The

analog ground return path should be separate from the power ground (PGND) return

path.

4ILIM

Current Limit Setting. Connect a resistor from SW (Pin 6) to ILIM to set the

overcurrent threshold for the converter.

5, 60

VIN

Supply Voltage for Controller. The VIN operating voltage range is from 4.5V to 50V.

A 0.47 μF ceramic capacitor from VIN (pin 60) to GND is required for decoupling.

Pin 5 should be externally connected to either PVIN or Pin 60 on PCB.

6, 40 to 48, 51

Switch Node and Current-Sense Input. High current output driver return. The SW

pin connects directly to the switch node. Due to the high-speed switching on this

pin, the SW pin should be routed away from sensitive nodes. The SW pin also

senses the current by monitoring the voltage across the low-side MOSFET during

OFF time.

7, 8

FREQ

Switching Frequency Adjust Input. Leaving this pin open will set the switching

frequency to 600 kHz. Alternatively, a resistor from this pin to ground can be used

to lower the switching frequency.

9 to 13

PGND

Power Ground. PGND is the return path for the buck converter power stage. The

PGND pin connects to the sources of low-side N-Channel external MOSFET, the

negative terminals of input capacitors, and the negative terminals of output

capacitors. The return path for the power ground should be as small as possible

and separate from the analog ground (GND) return path.

14 to 22

PVIN

Power Input Voltage. Connection to the drain of the internal high-side power

MOSFET.

23 to 38

VOUT

Output Voltage. Connection with the internal inductor, the output capacitor should

be connected from this pin to PGND as close to the module as possible.

No Connection. Leave it floating.

MIC28303

64-Pin 12 mm x 12 mm QFN (MP)

PVIN

PGND

PVIN

PGND

FREQ

VIN

GND

VOUT

ANODE

ILIM

GND

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