Document Number: MC33730

Rev. 5.0, 7/2009

Freescale Semiconductor

Advance Information

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

© Freescale Semiconductor, Inc., 2009. All rights reserved.

Switch Mode Power Supply with

Multiple Linear Regulators

The 33730 is a multiple output power supply integrated circuit for

automotive applications. The integrated circuit (IC) incorporates a

switching regulator which operates over a wide input voltage range

from +4.5V to +26.5V.

The step-down switching regulator uses a fixed frequency PWM

voltage mode control. It has a 3.5A current limit (typical) and the slew-

rate is adjustable via a control pin to reduce switching noise. The

switching regulator has an adjustable frequency oscillator, which

allows the user to optimize its operation over a wide range of input

voltages and component values.

The linear regulators can be configured either as two normal mode

provide power to external sensors.

Features

• Provides all regulated voltages for Freescale 32-bit

microcontroller family

• Adjustable frequency switching buck regulator with slew-rate

control

• Power sequencing provided

operating down to 4.5V at KA_VBAT pin

• Provides two 5.0V protected supplies for sensors

• Provides reverse battery protection FET gate drive

• Provides necessary MCU monitoring and fail-safe support

• Pb-free packaging designated by suffix code EK

Figure 1. 33730 Simplified Application Diagram

SWITCHING POWER SUPPLY

EK SUFFIX (PB-FREE)

98ARL10543D

32-LEAD SOICW-EP

33730

ORDERING INFORMATION

Device

Temperature

Package

MCZ33730EK/R2

-40°C to 125°C

32-SOICW-EP

VBAT

KA_VBAT

VIGN

VREF1,2

GND

HRT

BOOT

SW

VDDH

VCOMP

VDD3_B

VDD3

VDDL

VKAM

RSTs

+

+

5.0 V

+

+

INV

VDDL_B

5.0V

KA_1.0V

1.5V

MCU

(32 Bit)

3.3V

33730

P1

P2

PFD

P3

REGON

IGN_ON

CP

5.0V