PIP212-12M Datasheet, PDF(6/21 Page) NXP Semiconductors

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PIP212-12M Datasheet, PDF (6/21 Pages) NXP Semiconductors – DC-to-DC converter powertrain

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Philips Semiconductors

PIP212-12M

DC-to-DC converter powertrain

7.7 Over Temperature Protection (OTP)

Protection against over temperature is provided by an internal thermal shutdown

incorporated into the control circuit. When the control circuit die temperature exceeds the

upper thermal trip level, both MOSFETs are switched off and the internal VDDG regulator

disabled. This state continues until the die temperature falls below the lower trip

temperature. This function is only operational when VDDC is above the UVLO level.

7.8 Am I Switching (AIS)

The AIS ï¬ag is designed for use with lost phase detection circuitry. During normal

operation (i.e. when PRDY and DISABLE are HIGH and VI is either HIGH or LOW), the

AIS pin is pulled LOW if no voltage transients have been detected on the VO pin for a

period of approximately 40 Âµs. If DISABLE is LOW or the driver is in 3-state mode, the AIS

pin will become ï¬oating (open drain) irrespective of any previous state. False signals

during start-up are prevented by activating this function approximately 200 Âµs after either

the DISABLE pin becoming HIGH or the driver leaving the 3-state mode.

7.9 Disable

This is the disable or enable function of the driver. Pulling the DISABLE pin LOW switches

off both MOSFETs, disables the REG5V output, and makes the AIS ï¬ag open drain. This

pin is internally pulled LOW whilst VDDC remains below the UVLO threshold. Once VDDC

exceeds the UVLO threshold, this pin is pulled HIGH by an internal resistor. In this way the

driver will enable itself unless there is an external pull down. In multiphase applications,

connecting the DISABLE pins of multiple PIP212-12M devices together will ensure that all

devices will only become enabled when the voltage on the VDDC pins of all of the devices

has exceeded the UVLO threshold; see Figure 10.

7.10 Reg5V

This function provides a low current regulated 5 V output voltage suitable for providing

power to a PWM controller. It is operational when both PRDY and DISABLE are HIGH.

Operation as a 5 V power supply is only guaranteed when VDDC is > 7 V. This pin can also

be used as part of an enable function for a PWM controller; this ensures that the PWM is

enabled only when the PIP212-12M is fully operational (i.e. both PRDY and DISABLE are

HIGH).

9397 750 14586

Preliminary data sheet

Rev. 02 â 2 March 2005

6 of 21

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