33730 datasheet(14/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33730

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

5 VOLT BUCK REGULATOR

This is the main regulator that supplies 5 Volts to the

following protected and regulated outputs, VREF1, VREF2,

VDD3, and VDDL.

OSCILLATOR

This is the frequency source for the switching (buck) 5 Volt

regulator. The frequency of oscillation is selected by an

external resistor to ground.

BAND GAP REFERENCE

This is the main voltage reference, which is used as the

standard for all the current and voltage sources in the

MC33730.

PROTECTION FET DRIVER

The protection FET is used to prevent reverse battery

connections from damaging the MC33730. The gate drive for

the Protection FET is provided by this driver circuit.

SLEEP/WAKE CIRCUITRY

This circuitry is responsible for the two main modes of

operation for the MC33730, Sleep mode and Wake mode. In

the Sleep mode, only the keep alive outputs are active, and

the rest of the circuitry is in a low power drawing sleep state.

In the Wake mode, the MC33730 is fully functional and

normal current is being consumed.

IGNITION DRIVER

This block of circuitry controls all the voltage outputs,

except for the keep alive voltage output(s). It also provides an

output signal to indicate that the ignition switch has been

activated.

VREF1

This output is one of two protected 5 volt outputs that can

be used to supply external sensors or other analog circuits

requiring a regulated, short-circuit protected 5 volt supply.

VREF2

This output is one of two protected 5 volt outputs that can

be used to supply external sensors or other analog circuits

requiring a regulated, short-circuit protected 5 volt supply.

VDD3 REGULATOR

This is one of three, voltage programmable, regulated

supplies. This supply is controlled by the ignition switch.

VDDL REGULATOR

This is one of three, voltage programmable, regulated

supplies. This supply is controlled by the ignition switch.

VKAM

This is one of three, voltage programmable, regulated

supplies. This supply is NOT controlled by the ignition switch.

VOLTAGE PROGRAMMING

P1, P2, and P3 are three logic level inputs that control the

voltage that is available on the VDD3, VDDL and VKAM

outputs.

Table 6 indicates the 8 different combinations of P1, P2,

and P3 and the resultant voltage values.

Band Gap Reference

Sleep/Wake Circuitry

Voltage Programmming Input

Protection FET Driver

Ignition Input

Oscillator

5 Volt Buck Switching

Regulator

5 Volt Protected Outputs

(VREF1, VREF2)

Linear Regulator Outputs

(VDDL, VDD3, VKAM)

Ignition Driver

Reset Circuitry

Input Functions

Internal Functions

Output Functions

MC33730 - Functional Block Diagram

33730 датащи(PDF) 14 Page - Freescale Semiconductor, Inc

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