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MB39C014

1 ch DC/DC Converter IC with PFM/PWM Synchronous Rectification

Cypress Semiconductor 

MB39C014

5.6 Protection Circuit

This IC has a built-in over-temperature protection circuit.

The over-temperature protection circuit turns off both N-ch and P-ch switching FETs when the junction

temperature reaches +135°C. When the junction temperature comes down to + 110°C, the switching FET is returned to the normal

operation.

Since the PWM control circuit of this IC is in the control method in current mode, the current peak value is also monitored and controlled

as required.

■ Function Table

MODE

Shutdown mode

Operation mode

Switching

Frequency

—

2.0 MHz

3.2 MHz

Input

CTL FSEL

L

*

H

L

H

H

OUTPUT Pin

Voltage

Output stop

VOUT voltage output

Output

VREF

Output stop

1.2 V

POWERGOOD

Function stop

Operation

* : Don't care

Document Number: 002-08361 Rev. *C

Page 8 of 32

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