MC33730FS, Switch Mode Power Spply with Multiple Linear Regulators - Fact Sh ...

Analog, Mixed-signal and Power Management
MC33730
Switch mode power supply with multiple linear regulators
Applications
MC33730 Simplified Application Drawing
• Automotive Power Train
• Engine Control
• Transmission Control
33730
• Electronic Power Steering
• Industrial
+
+
VBAT
BOOT
SW
+
MCU
(MPC5XXX)
Overview
PFD
KA_VBAT
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 +4.5 to +26.5 V.
The step-down switching regulator utilizes a
fixed frequency PWM voltage mode control. It
has a 3.5 A current limit (typ.) and the Slew-rate
is adjustable via a control pin, to reduce the
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 regulators VDD3, VDDL and
one standby regulator VKAM, or as one normal
mode linear regulator (VDDL) and two standby
regulators (VKAM and VDD3 Standby). Two
protected outputs VREF (1, 2) are used to provide
power to the external sensors.
VIGN
IGN_ON
5.0V
+
VDDH
5.0V
INV
VCOMP
VDD3_B
VDD3
3.3V
VDDL_B
VDDL
1.5V
VREF1,2
P1
P2
P3
CP
VKAM
5.0 V
GND
RSTs
HRT
REGON
KA_1.0V
Features
Parametric Table
• Provides all regulated voltages for Freescale’s
32-bit microcontroller families
Part Number
• Wide operating input voltage range of buck
regulator up to +35 V
MCZ33730EK/R2
• Adjustable frequency switching buck regulator
with slew-rate control
Max Input Voltage
Output Current
Temperature Range
Package
40 V
2.0 A
-40 °C to 125 °C
32 SOICW-EP
MC33730EK/R2
Development Tools
Part Number
Description
• Programmable voltages VDDL, VDD3 - ±3%
accuracy
KIT33730EKEVBE
Evaluation board to demonstrate the key features of the MC33730
• Programmable standby regulator VKAM ±15% accuracy, operating down to 4.5 V at
KA_VBAT pin
Document Number
Title
Description
MC33730
Data Sheet
Presents the specifications for the product
• VDD3 can be programmed as an optional
second standby regulator with ±15% accuracy
SG1002
Selector Guide
Analog and power management device comparison
SG187
Selector Guide
Automotive device comparison
• Power sequencing
Documentation
• Provides two 5.0 V Protected supplies for
sensors
• Low quiescent current IQ = 500 μA maximum
over temperature.
• Provides gate drive for a reverse battery
protection FET
• Provides necessary MCU monitoring and failsafe support
Benefits
• System solution for the electronic control
module
• Supports 32-bit and other microcontroller
families
• Low system cost
Questions
• High performance, improved efficiency
• Q. Why use a switching regulator?
• Protection and safety features
A. To increase efficiency, wasting less power as
heat.
• Automotive temperature range & reliability
Freescale Semiconductor is a leading provider for
over 25 years of high-performance products using
SMARTMOS™ technology that combines digital,
power and standard analog functions. The
company supplies analog and power management
ICs for the automotive, consumer, networking and
industrial markets. Freescale’s analog and power
ICs complement our broad portfolio of micro
controllers, microprocessors, ZigBee®
technology, digital signal processors, sensors,
with development tools and support to provide
system solutions to customers.
• Q. Are the different output voltages
programmable?
A. Yes. There are eight different combinations
of voltages for the VDDL, VDD3 and
VKAM.
• Q. Can the MCU keep the MC33730 enabled
even when the ignition input is turned off.
A. Yes. The enable input, from the MCU can
override the ignition input to allow the
MCU to stay powered until it is ready to
shut down.
• Q. Does this IC have applications anywhere
else besides Automotive ECUs.
A. Yes. The MC33730 is a general purpose
switching power supply that can be used in
many other commercial, industrial and
consumer applications.
Learn More: For current information about Freescale products,
please visit www.freescale.com.
Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc.
All other product or service names are the property of their respective owners.
© Freescale Semiconductor, Inc., 2012 All rights reserved.
Document Number: MC33730FS, Rev. 3.0