Micrel Inc.

MIC23158/9

November 2012

3

M9999-110812-A

Pin Description (Continued)

Pin Number

(Adjustable)

Pin Name

Pin Function

8

AGND2

Analog Ground for Regulator 2. Connect to a central ground point where all high current paths meet

9

EN2

Enable Input for Regulator 2. Logic high enables operation of regulator 2. Logic low will shut down

regulator 2. Do not leave floating.

10

SNS2

Sense Input for Regulator 2. Connect to the output of regulator 2 as close to the output capacitor as

possible to accurately sense the output voltage.

11

FB2

Feedback Input for Regulator 2. Connect a resistor divider from the output of regulator 2 to ground to

set the output voltage.

12

PG2

Power Good Output for Regulator 2. Open drain output for the power good indicator for output 2. Use

13

SS2

Soft-Start for Regulator 2. Connect a minimum of 200pF capacitor to ground to set the turn-on time of

regulator 2. Do not leave floating.

14

SS1

Soft-Start for Regulator 1. Connect a minimum of 200pF capacitor to ground to set the turn-on time of

regulator 1. Do not leave floating.

15

PG1

Power Good Output for Regulator 1. Open drain output for the power good indicator for output 1. Use

16

FB1

Feedback Input for Regulator 1. Connect a resistor divider from the output of regulator 1 to ground to

set the output voltage.

17

SNS1

Sense Input for Regulator 1. Connect to the output of regulator 1 as close to the output capacitor as

possible to accurately sense the output voltage.

18

EN1

Enable Input for Regulator 1. Logic high enables operation of regulator 1. Logic low will shut down

regulator 1. Do not leave floating.

19

AGND1

Analog Ground for Regulator 1. Connect to a central ground point where all high current paths meet

20

AVIN1

Analog Input Voltage for Regulator 1. Tie to VIN1 and connect a capacitor to ground to decouple

noise.

EP

ePad

Exposed Heat Sink Pad. Connect to PGND.