MIC45404 datasheet(14/32 Pages) MICROCHIP

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MIC45404

DS20005478A-page 14

 2015 Microchip Technology Inc.

3.5

Ground Extension Pins

(GND_EXT)

These pins are used for the bottom terminal connection

of the internal VIN and VDDP decoupling capacitors.

The GND_EXT pins should be connected to the GND

net, directly at the top layer, using a wide copper

connection.

3.6

Input Voltage Pins (VIN)

Input voltage for the Buck Converter power stage and

input of the internal linear regulator. These pins are the

drain terminal of the internal high-side N-channel

MOSFET. A 10 µF (minimum) ceramic capacitor should

be connected from VIN to GND, as close as possible to

the device.

3.7

Power Ground Pins (GND)

Connect the output capacitors to GND Pins 23 and 24,

as close as possible to the module.

Connect the input capacitors to GND Pin 9, as close as

possible to the module.

3.8

Output-Side Connection Pins

(OUT)

Output side connection of the internal inductor. The

output capacitors should be connected from this pin

group to GND (Pins 23 and 24), as close to the module

as possible.

3.9

Switch Node Pins (LX)

Switch Node: Drain (low-side MOSFET) and source

(high-side MOSFET) connection of the internal power

N-channel FETs. The internal inductor switched side

and the bootstrap capacitor are connected to LX.

Leave this pin floating.

3.10

Bootstrap Capacitor Pin (BST)

Connection to the internal bootstrap capacitor and

high-side power MOSFET drive circuitry. Leave this pin

floating.

3.11

Power Good Output Pin (PG)

When the output voltage is within 92.5% of the nominal

set point, this pin will go from logic low to logic high

through an external pull-up resistor. This pin is the drain

connection of an internal N-channel FET.

3.12

Output Voltage Selection Pins

(VOSET0 and VOSET1)

Three-state pin (low, high and High Z) for output volt-

age programming. Both VOSET0 and VOSET1 define

9 logic values, corresponding to nine output voltage

selections.

3.13

Not Connected Pins (NC)

These pins are not internally connected. Leave them

floating.

3.14

Current Limit Pin (ILIM)

This pin allows the selection of the current limit state:

low, high and High Z.

3.15

Switching Frequency Pin (FREQ)

This pin allows the selection of the frequency state: low,

high and High Z.

3.16

Analog Ground Pin (AGND)

This pin is a quiet ground for the analog circuitry of the

internal regulator and a return terminal for the external

compensation network.

3.17

Compensation Network Pin

(COMP)

Connect a compensation network from this pin to

AGND.

3.18

GND Exposed Pad

Connect to ground plane with thermal vias.

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