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MC33567D-1 View Datasheet(PDF) - ON Semiconductor

Part Name
Description
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MC33567D-1 Datasheet PDF : 8 Pages
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MC33567
FUNCTIONAL DESCRIPTION
Overcurrent Protection – Hiccup Mode
On detection of overcurrent, output goes into hiccup mode
where on period is 40 times shorter than off time. I.e., 1.0
msec ON, 40 msec OFF. When an overcurrent condition
exists, the output voltage will drop below the threshold. The
output is then turned on and off in a 1:40 duty cycle. Each
transition low to high of the enable input restarts the hiccup
mode holdoff period.
Shutoff (Shutdown) Function
Each internal regulator has an active high enable input. If
the input is held above the minimum threshold, the regulator
Logic table for Shutoff (Pin 3) on the 1.5V regulator:*
Shutoff Pin
1.5V Regulator
Output
No Connect
1.5V
< 0.8V
Shutoff
2.0V < SHDN < 4.2V
1.5V
> 4.1V
3.3V – Full ON
*See Figure 4, 1.5V / 3.3V AGP card detection
NOTE: MC33567–2 does not have full–on bypass feature
will operate normally. If the input is held low, the regulator
is turned off.
Logic table for Shutoff (Pin 3) on the 1.8V regulator:
Shutoff Pin
1.8V Regulator
Output
No Connect
1.8V
< 0.8V
Shutoff
> 2.0V
1.8V
This part has under voltage detection that uses the channel
resistance of an internal N–channel FET to put the regulator
into “hiccup mode” when a short is present on the regulated
 voltage plane. Under voltage detection is set to 75% of
regulation set point.
http://onsemi.com
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