MIC45404 datasheet(13/32 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005478A-page 13

MIC45404

3.0

PIN DESCRIPTION

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

3.1

Output Sensing Pins (OUTSNS)

Connect these pins directly to the Buck Converter

output voltage. These pins are the top side terminal of

the internal feedback divider.

3.2

Precision Enable/Turn-On Delay

Input Pin (EN/DLY)

The EN/DLY pin is first compared against a 515 mV

threshold to turn on the on-board LDO regulator. The

EN/DLY pin is then compared against a 1.21V (typical)

threshold to initiate output power delivery. A 150 mV

typical hysteresis prevents chattering when power

delivery is started. A 2 µA (typical) current source pulls

up the EN/DLY pin. Turn-on delay can be achieved by

connecting a capacitor from EN/DLY to ground, while

using an open-drain output to drive the EN/DLY pin.

3.3

MOSFET Drivers Internal

Supply Pin (VDDP)

Internal supply rail for the MOSFET drivers, fed by the

VDDA pin. An internal resistor (10) between the VDDP

and VDDA pins, and an internal decoupling capacitor

are provided in the module in order to implement an RC

filter for switching noise suppression.

3.4

Internal Regulator Output Pin

(VDDA)

Output of the internal linear regulator and internal

supply for analog control. A 1 µF minimum ceramic

capacitor should be connected from this pin to GND; a

2.2 µF nominal value is recommended.

TABLE 3-1:

PIN FUNCTION TABLE

MIC45404

Symbol

Pin Function

1, 54

OUTSNS

Output Sensing Pin

EN/DLY

Precision Enable/Turn-On Delay Input Pin

3VDDP

MOSFET Drivers Internal Supply Pin

4VDDA

Internal LDO Output and Analog Supply Pin

5, 6

GND_EXT

Ground Extension Pins

7, 8

VIN

Input Voltage Pins

9, 23, 24, 50, 51

GND

Power Ground Pins

11, 12, 13, 14, 15, 16, 17, 18,

19, 20, 21

OUT

Output Side Connection Pins

10, 22, 25, 40

KEEPOUT

Depopulated Pin Positions

26, 27, 28, 29, 30, 31, 32, 33,

34, 35, 36, 37, 38, 39

Switch Node Pins

41, 42

BST

Bootstrap Capacitor Pin

Power Good Output Pin

VOSET0

Output Voltage Selection Pins

VOSET1

46, 47

Not Connected Pins

ILIM

Current Limit Selection Pin

FREQ

Switching Frequency Selection Pin

AGND

Analog Ground Pin

COMP

Compensation Network Pin

GND_EP

Ground Exposed Pad.

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