Micrel, Inc.

MIC2199.

January 2010

2

M9999-011310

Pin Configuration

FB

CSH

VOUT

3

4

5

COMP

EN/UVLO

1

2

BST

GND

LSD

10

9

8

VDD

7

HSD

VSW

12

11

Ordering Information

Part Number

Voltage

Temperature Range

Package

Standard

Pb-Free

MIC2199BML

MIC2199YML

Adj

−40ºCto+125ºC

Pin Description

Pin Number

Pin Name

Pin Function

1

COMP

Compensation(Output): Internalerroramplifieroutput.Connecttocapacitor

or series RC network to compensate the regulator control loop.

2

EN/UVLO

Enable/UndervoltageLockout(Input): Low-levelsignalpowersdownthe

controller. Input below the 2.5V threshold disables switching and functions as

an accurate undervoltage lockout (UVLO). Input below the threshold forces

complete micropower (<0.1µA) shutdown.

3

FB

Feedback(Input): RegulatesFBpinto0.8V.See“Applications Information”

for resistor divider calculations.

4

CSH

Current-SenseHigh(Input): Currentlimitcomparatornon-invertinginput.A

current-sense resistor set the current limit threshold level. This is also the

non-invertinginputtothecurrentsenseamplifier.

5

VOUT

Current-SenseLow(Input): Outputvoltagefeedbackinputandinverting

inputforthecurrentlimitcomparatorandthecurrentsenseamplifier.

6

VIN

UnregulatedInput(Input): +4.5Vto+32Vsupplyinput.

7

VDD

drivesupplyvoltageandinternalsupplybusfortheIC.BypasstoGNDwith

4.7µF.

8

LSD

Low-SideDrive(Output): High-currentdriveroutputforlow-sideN-Channel

9

GND

Ground (Return).

10

BST

Boost(Input): Providesdrivevoltageforthehigh-sideMOSFETdriver.The

11

VSW

Switch(Return): High-sideMOSFETdriverreturn.

12

HSD

High-SideDrive(Output): High-currentdriveroutputforhigh-sideMOSFET.