Micrel, Inc.

MIC2358YLQ

July 2010

4

M9999-070810

Pin Description

Pin Number

Pin Name

Pin Function

1

P1OUTPOS

Port 1 Positive 48V Terminal Input.

2

P1OUTNEG

Port 1 Negative 48V Terminal Input.

3

P1GATE

Port 1 Gate Drive Output: Connect this pin to the gate terminal of Port 1’s external power

FET.

4

P1SENSE

Port 1 Sense Input: Connect this pin the source terminal of Port 1’s external power FET.

5

P2OUTPOS

Port 2 Positive 48V Terminal Input.

6

P2OUTNEG

Port 2 Negative 48V Terminal Input.

7

P2GATE

Port 2 Gate Drive Output: Connect this pin to the gate terminal of Port 2’s external power

FET.

8

P2SENSE

Port 2 Sense Input: Connect this pin the source terminal of Port 2’s external power FET.

9

P3OUTPOS

Port 3 Positive 48V Terminal Input.

10

P3OUTNEG

Port 3 Negative 48V Terminal Input.

11

P3GATE

Port 3 Gate Drive Output: Connect this pin to the gate terminal of Port 3’s external power

FET.

12

P3SENSE

Port 3 Sense Input: Connect this pin the source terminal of Port 3’s external power FET.

13

P4OUTPOS

Port 4 Positive 48V Terminal Input.

14

P4OUTNEG

Port 4 Negative 48V Terminal Input.

15

P4GATE

Port 4 Gate Drive Output: Connect this pin to the gate terminal of Port 4’s external power

FET.

16

P4SENSE

Port 4 Sense Input: Connect this pin the source terminal of Port 4’s external power FET.

17

NC

No connection.

18

ENABLE_L

Autonomous mode select pin Input. When high, all ports are disabled on power up and can

only be enabled via SMBus interaction. When low, all ports are enabled on power up and

device operation will proceed without SMBus interaction necessary. Internally pulled up to

+5V by a 50kΩ resistor.

19

ALTB

Autonomous mode select pin Input. When high all ports will be configured for Alt B operation,

when low all ports will be configured for Alt A operation. Internally pulled up to +5V by a 50kΩ

resistor.

20

ICO

Autonomous mode select pin Input. When high, ports will not have power removed if its

current exceeds the class-dependent overload current, i.e. overload current will be equal to

Class 0 Level. Internally pulled up to +5V by a 50kΩ resistor.

21

ACMPS

Autonomous mode select pin Input. When high, AC Maintain Power Signature feature is

enabled. Internally pulled up to +5V by a 50kΩ resistor.

22

DCMPS

Autonomous mode select pin Input. When high, DC Maintain Power Signature feature is

enabled. Internally pulled up to +5V by a 50kΩ resistor.

23

5VS

+5V Supply Voltage: Applying a +5V supply relative to 48VRTN powers the MIC2358YLQ’s

internal digital circuits, state machines, and port control circuits.

24

NC

No connection.

25

DRTN

Digital Ground Return.

26

48VS

48V Power Supply Input: In a negative common application, applying a conditioned +48V

supply (+44V ≤ 48VS ≤ +60V) provides the supply voltage to power the MIC2358YLQ and all

eight ports. In a positive common application, apply system COM to this pin.

27

DRTN

Digital Ground Return.

28

ARTN

Analog Ground Return.

29

ARTN

Analog Ground Return.