BUK3F00-50WDXX Datasheet, PDF (8/52 Pages) NXP Semiconductors – Controller for TrenchPLUS FETs

NXP Semiconductors
BUK3F00-50WDxx
Controller for TrenchPLUS FETs
9.1.2
Module supply: pins V_CC(MOD) and GND
Pins V_CC(MOD) and GND supply power to the circuits in the device that need to be kept
functioning when the main battery supply dips below its normal operating limit. It is
anticipated that the connection will be to the protected supply of the application module
control circuits. This can be created using a suitable diode and storage capacitor from the
battery supply. The connection should be decoupled close to the device.
Low module voltage causes the device to go through a Power-On Reset (POR). This
condition is detected when the module supply voltage goes below the module
undervoltage threshold voltage (V_th(uv)mod). The power-on reset is triggered when the
supply voltage recovers and exceeds V_th(uv)mod. Hysteresis on this detection reduces the
possibility of repeated resetting when the module supply is close to the threshold value.
The supply circuit has an internal overvoltage clamp to protect the control chip from
overvoltage transients and is also protected against ESD. This supply should be protected
against reverse battery connection in the application circuit.
9.1.3
External logic supply: pins V_CC(LOG)EXT and GND
The external logic supply provides power for the SDO and PWMMON output pins. Pin
V_CC(LOG)EXT should be connected to the same supply (3.3 V or 5 V) used by the circuits
that monitor these outputs.
9.1.4
Analog measurement supply: pins V_CC(MEASC) and GND
This supply provides power for the IMEAS analog current measurement output. Pin
V_CC(MEASC) should be connected to the same supply (3.3 V or 5 V) used by the circuit that
uses this output.
If this output is not needed, then pins V_CC(MEASC) and IMEAS should be grounded.
9.1.5
Digital supply: pins V_CC(DIGC) and GND(DIGC)
This supplies power to the internal regulator for the digital core and should be connected
to the same potential as V_CC(MOD) and GND. It is not internally connected to the module
supply, ensuring that digital noise does not affect the measurement circuits. The
connection should be decoupled close to the device.
The digital supply circuit has an internal overvoltage clamp to protect the
BUK3F00-50WDxx from overvoltage transients and is also protected against ESD.
9.1.6 Reference supplies: pins IREFCURR and IREFTEMP
An internal band gap reference is used to ensure stable voltage and current references:
• Measured current reference pin IREFCURR: The full-scale analog output
measurement current and the full-scale measurement current through the ADC are
both set by connecting an external resistor between pins IREFCURR and GND.
• Temperature reference pin IREFTEMP: The forward current for the temperature
sensing diodes in the TrenchPLUS FETs is set by connecting an external resistor
between pins IREFTEMP and GND.
BUK3F00-50WDXX_4
Product data sheet
Rev. 04 — 4 September 2008
© NXP B.V. 2008. All rights reserved.
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