MIC2086 datasheet(2/29 Pages) MICREL

2 / 29 page

Micrel, Inc.

MIC2085/2086

May 2006

M9999-050406

(408) 955-1690

Ordering Information

Part Number

Standard

Pb-Free

Fast Circuit Breaker Threshold

Discharge Output

Package

MIC2085-xBQS

MIC2085-xYQS

x = J, 95mV

x = K, 150mV*

x = L, 200mV*

x = M, Off

16-Pin QSOP

MIC2086-xBQS

MIC2086-xYQS

x = J, 95mV

x = K, 150mV*

x = L, 200mV*

x = M, Off

Yes

20-Pin QSOP

* Contact factory for availability.

Pin Configuration

MIC2085

MIC2086

16-Pin QSOP (QS)

20-Pin QSOP (QS)

Pin Description

Pin Number

MIC2086

Pin Number

MIC2085

Pin Name

Pin Function

CRWBR

Overvoltage Timer and Crowbar Circuit Trigger: A capacitor connected to this

pin, sets the timer duration for which an overvoltage condition will trigger an

external crowbar circuit. This timer begins when the OV input rises above its

threshold as an internal 45µA current source charges the capacitor. Once the

voltage reaches 470mV, the current increases to 1.5mA.

CFILTER

Current Limit Response Timer: A capacitor connected to this pin defines the

period of time (tOCSLOW) in which an overcurrent event must last to signal a fault

condition and trip the circuit breaker. If no capacitor is connected, then tOCSLOW

defaults to 5µs.

CPOR

Power-On Reset Timer: A capacitor connected between this pin and ground

sets the start-up delay (tSTART) and the power-on reset interval (tPOR). When VCC

rises above the UVLO threshold, the capacitor connected to CPOR begins to

charge. When the voltage at CPOR crosses 1.24V, the start-up threshold

(VSTART), a start cycle is initiated if ON is asserted while capacitor CPOR is

immediately discharged to ground. When the voltage at FB rises above VFB,

capacitor CPOR begins to charge again. When the voltage at CPOR rises above

the power-on reset delay threshold (VTH), the timer resets by pulling CPOR to

ground, and /POR is deasserted. If CPOR = 0, then tSTART defaults to 20µs.

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