33730 datasheet(12/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33730

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 33730 multi-output power supply integrated circuit

addresses the system power supply needs for applications

using the Freescale 32-bit microcontroller family architecture.

FUNCTIONAL PIN DESCRIPTION

HARDWARE RESET TIMER (HRT)

This pin is the hardware reset timer input, which provides

delays for the Reset outputs. This delay is programmed by an

external resistor to GND.

VKAM RESET (RSTKAM)

This pin is an open drain reset output monitoring the VKAM

supply to the microprocessor. This output is actively pulled

low when the VKAM output voltage falls below its reset

threshold level.

VDDH RESET (RSTH)

This pin is an open drain reset output monitoring the

VDDH regulator. This output is actively pulled low when the

VDDH output voltage falls below its reset lower threshold

level or when the VDDH output voltage exceeds its reset

upper threshold level

VDDL RESET (RSTL)

This pin is an open drain reset output monitoring the VDDL

regulator. This output is actively pulled low when the VDDL

output voltage falls below its reset threshold level.

VDD3 RESET (RST3)

This pin is an open drain reset output monitoring the VDD3

regulator. This output is actively pulled low when the VDD3

output voltage falls below its reset threshold level.

VREF OUTPUT 2 (VREF2)

This pin is output of the protected supply VREF2. This

output supplies sensors outside of the electronic control

module and therefore it is protected against a battery short

and short to -1V. This pin is supplied from the VDDH through

the internal protection FET.

VDDL REGULATOR (VDDL)

This pin is the VDDL regulator output feedback pin. The

emitter of VDDL regulator external NPN pass transistor is

connected to this pin.

VDDH REGULATOR (VDDH)

This pin is the 5.0V output feedback pin of the buck

regulator. This pin is also a power input for the protected

outputs VREF1 and VREF2.

VDDL REGULATOR BASE DRIVE (VDDL_B)

VDDL linear regulator base drive. This output supplies

current into the base of the regulator external pass NPN

transistor.

VREF OUTPUT 1 (VREF1)

This pin is output of the protected supply VREF1. This

output supplies sensors outside of the electronic control

module and therefore it is protected against short battery and

short to -1V. This pin is supplied from the VDDH through the

internal protection FET.

REGULATOR HOLD ON (REGON)

Regulator Hold On input control pin. The 33730 can be

enabled or kept in the Normal operational mode by holding

this pin high.

VIGN STATUS (IGN_ON)

This open drain output signals the status of the VIGN pin.

This logic output is actively pulled low when the VIGN control

input is pulled high.

COMPENSATION (VCOMP)

This pin provides switching pre-regulator compensation

network. It is the output of the switching regulator error

amplifier.

INVERTING INPUT (INV)

This pin is the inverting input of the switching regulator

error amplifier.

FREQUENCY ADJUSTMENT (FREQ)

This is the frequency adjustment input of the switching

regulator. The operating frequency of the switching regulator

can be programmed by an external resistor from this pin to

ground.

PROGRAMMING PIN 1 (P1)

Programming Pin 1 for the VDD3, VDDL, and VKAM

reference voltage. The output voltage of the VDD3, VDDL

and VKAM regulators can be programmed by the P1, P2, and

P3 pins (see Table 6).

33730 Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

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