MIC33M656 datasheet(17/46 Pages) MICROCHIP

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DS20006256A-page 17

MIC33M656

3.0

PIN DESCRIPTIONS

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

3.1

Power Ground Pin (PGND)

PGND is the ground path for the MIC33M656 buck

converter power stage. The PGND pin connects to the

sources of the low-side N-channel MOSFET, the nega-

tive terminals of the input capacitors and the negative

terminals of the output capacitors. The loop for the

Power Ground should be as small as possible and

separate from the Analog Ground (AGND) loop.

3.2

Switch Node Pin (SW)

Switching node output pin which connects to the inter-

nal MOSFETs and inductor. This is a high-frequency

connection; therefore, traces should be kept as short

and as wide as practical.

3.3

Input Voltage Pin (PVIN)

Input supply to the source of the internal high-side

P-channel MOSFET. The PVIN operating voltage range

is from 2.4V to 5.5V. An input capacitor between PVIN

and the Power Ground (PGND) pin is required and

placed as close as possible to the IC.

3.4

Analog Voltage Input Pin (SVIN)

The power to the internal reference and control

sections of the MIC33M656. Internally connected to

PVIN through a 10 resistor.

TABLE 3-1:

PIN FUNCTION TABLE

Pin Number

Symbol

Description

2, 3, 4, 5, 23, 24,

39, 40

PGND

Power Ground is the ground path for the MIC33M650 power module.

1, 53

AUX_PVIN

Auxiliary Power Input Voltage Pins: Connect externally to PVIN.

6, 7, 8, 9, 10, 11, 12,

13, 14, 15, 16, 17,

18, 19, 20, 21, 22

Switch Node Pins. SW connects to the internal MOSFETs and inductor.

Do not connect any external load to this point.

41, 42

PVIN

Power Supply Voltage Pins.

25, 26, 27, 28, 29,

30, 31, 32, 33, 34,

35, 36, 37, 38

OUT

Output Side Connection Pins.

43, 44

SVIN

Analog Voltage Input Pins: The power to the internal reference and

control sections of the MIC33M650. Internally connected to PVIN through

a 10

 resistor.

46, 47

AUX_AGND

Auxiliary Analog Ground Pins: Connect externally to AGND.

SCL

I2C Clock (Input) Pin: I2C serial bus clock input.

SDA

I2C Data (Input/Output) Pin: I2C serial bus data bidirectional pin.

Enable (Input) Pin: Logic high enables the operation of the regulator. The

EN pin should not be left floating.

Power Good (Output) Pin: This is an open-drain output that indicates

when the output voltage is higher than the 91% limit.

VOUT

Output Voltage Sense (Input) Pin: This pin is used to remotely sense the

output voltage. Connect VOUT as close to the output capacitor as possible

to sense the output voltage.

AGND

Analog Ground Pin: Internal signal ground for all low-power circuits.

EP_OUT

Exposed Thermal Pad: Internally connected to OUT.

EP_SW

Exposed Thermal Pad: Internally connected to SW node.

EP_PGND

Exposed Thermal Pad: Internally connected to PGND.

EP_PVIN

Exposed Thermal Pad: Internally connected to PVIN.

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