MIC33M350 datasheet(15/32 Pages) MICROCHIP

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DS20006348B-page 15

MIC33M350

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLE

MIC33M350

Symbol

Pin Function

1, 2, 3, 10, 11

PGND

Power Ground Pin: PGND is the ground path for the MIC33M350 buck

converter power stage.

4, 5, 6, 7, 8, 9

Switch Node Pin

PVIN

Power Supply Voltage Pin

SVIN

Analog Voltage Input Pin. The power to the internal reference and

control sections of the MIC33M350 device. A 1.0 µF ceramic

capacitor from SVIN to GND must be used. Internally connected to

PVIN through a 10 resistor.

VSEL2

Output Voltage Selection Control Pin 2 (Input): The Logic state of the

VSEL1 and VSEL2 selects the register that sets the output voltage. This

input has three Digital states: High, Low and Floating.

VSEL1

Output Voltage Selection Control Pin 1 (Input): The Logic state of the

VSEL1 and VSEL2 selects the register that sets the output voltage. This

input has three Digital states: High, Low and Floating.

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

EN pin should not be left open.

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

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

VOUT

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

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

possible to sense output voltage. Also provides the path to discharge

the output through an internal 10

 resistor when disabled.

12, 13, 14, 15, 16

OUT

Power Output Side Connection Pins

AGND

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

EP1_PGND

Exposed Thermal Pad Pin: Internally connected to PGND

EP2_PGND

Exposed Thermal Pad Pin: Internally connected to PGND

EP_SW

Exposed Thermal Pad Pin: Internally connected to SW Node

EP_OUT

Exposed Thermal Pad Pin: Internally connected to Output side

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