Micrel, Inc.

MIC1344

April 24, 2015

2

Revision 1.0

Ordering Information

Part Number

Marking

Output Current

Junction Temperature Range

Package

(1, 2)

MIC1344YFT

4N

Adjustable (3.0A maximum)

–40°C to +125°C

12-Pin 2mm × 2mm FTQFN

Notes:

1.

Pin 1 indicator = “

▲”

2.

Green RoHS compliant package. Lead finish is NiPdAu. Mold compound is halogen free.

Pin Configuration

12-Pin 2mm × 2mm FTQFN (FT)

(Top View)

Pin Description

Pin Number

Pin Name

Pin Function

1

INB

Supply Voltage Input B. This input may be bypassed to GND with >0.1µF, X7R or similar, ceramic

type capacitor. This input is hot swappable.

2

STBOK

Open drain output, digital status monitor for supply voltage Input B (INB). Voltage will be low if

any of the following conditions occur:

•

INB is below the UVLO limit.

•

The output current from INB is at its set current limit.

•

The die temperature exceeds the overtemperature limit.

•

•

Prolonged high hysteresis mode engaged.

3

BSEL\

Open Drain Output. Low if Input B (INB) is providing power to the OUT pin.

4

ILIMB

A resistor from this pin to ground sets the current limit for INB. The current flowing into INB can be

monitored by the voltage on this pin.

5

ENB

The ENA and ENB digital inputs control which voltage input (INA or INB) is connected to the

voltage out (OUT) pin. There is an internal 570k

Ω pull-down on this pin to ensure that automatic

select mode is active when the logic that is driving the MIC1344 is being powered up. Table 1

shows how to control the power routing with the ENA and ENB inputs.

6

GND

Ground.