MIC2131 datasheet(3/20 Pages) MICREL

3 / 20 page

Micrel, Inc.

MIC2130/1

April 2008

M9999-042108-C

Pin Description

Pin Number

MLF-16

Pin Number

e-TSSOP-16

Pin Name

Pin Function

HCL*

AGND2

High Current Limit (Output): The capacitor on this pin sets

the duration of time so that the current limit will be set to

200% of its nominal set current. AGND2 for MIC2130

Soft Start (Output): Active at Power-up, Enable, and Current

Limit recovery.

Feedback (Output): Input to error amplifier. Regulates to

0.7V.

COMP

Compensation (Output): Pin for external compensation.

AGND1

Analog Ground.

EN/UVLO

Enable (Input): Logic low turns the IC off. When the voltage

drops below the band gap reference voltage of the IC the

device turns off. This accurate threshold allows the pin to be

used as an accurate under voltage lockout.

VIN

Supply Voltage (Input): 8V to 40V.

VDD

5V Internal Linear Regulator from VIN. When VIN is <8V,

this regulator operates in drop-out mode. Connect external

bypass capacitor.

LSD

Low-Side Drive (Output): High-current driver output for

external low-side MOSFET.

PGND

Power Ground: High current return for ext. Low side driver.

Switch Node (Output): High current output driver return.

HSD

High-Side Drive (Output): High current output-driver for ext.

high-side MOSFET.

BST

Boost (Output): Provides voltage for high-side MOSFET

driver. The gate drive voltage is higher than the source

voltage by VDD minus a diode drop.

Current Sense (Output): Current-limit comparator non

inverting input. The current limit is sensed across the low-

side FET during the OFF time. Current limit is set by the

resistor in series with the CS pin.

AVDD

Analog Supply Voltage (internal 5V LDO): Connect external

By pass capacitor.

PGOOD

Power Good (Output): High output when VOUT > 90%

nominal.

Note:

* indicates that is only used on MIC2131.

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