Freescale Semiconductor KIT33730EKEVBE User Manual

Freescale Semiconductor

User’s Guide

KIT33730EKEVBE Evaluation Board

Document Number: KT33730UG

Rev. 1.0, 9/2009

Figure 1. KIT33730EKEVBE Evaluation Board

Table of Contents

1 Kit Contents / Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 Important Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4 Using Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

6 KIT33730EKEVBE Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 KIT33730EKEVBE Evaluation Board Bill of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

Kit Contents / Packing List

1 Kit Contents / Packing List

• KIT33730EKEVBE evaluation board

• CD33730EKEVBE

2 Freescale Semiconductor

KIT33730EKEVBE Evaluation Board, Rev. 1.0

2 Important Notice

Freescale provides the enclosed product(s) under the following conditions:

This evaluation kit is intended for use of ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY. It is provided as a sample IC pre-soldered to a printed circuit board to make it
easier to access inputs, outputs, and supply terminals. This EVB may be used with any development
system or other source of I/O signals by simply connecting it to the host MCU or computer board via
off-the-shelf cables. This EVB is not a Reference Design and is not intended to represent a final
design recommendation for any particular application. Final device in an application will be heavily
dependent on proper printed circuit board layout and heat sinking design as well as attention to
supply filtering, transient suppression, and I/O signal quality.

The goods provided may not be complete in terms of required design, marketing, and or
manufacturing related protective considerations, including product safety measures typically found
in the end product incorporating the goods. Due to the open construction of the product, it is the
user's responsibility to take any and all appropriate precautions with regard to electrostatic
discharge. In order to minimize risks associated with the customers applications, adequate design
and operating safeguards must be provided by the customer to minimize inherent or procedural
hazards. For any safety concerns, contact Freescale sales and technical support services.

Should this evaluation kit not meet the specifications indicated in the kit, it may be returned within 30
days from the date of delivery and will be replaced by a new kit.

Freescale reserves the right to make changes without further notice to any products herein.
Freescale makes no warranty, representation or guarantee regarding the suitability of its products
for any particular purpose, nor does Freescale assume any liability arising out of the application or
use of any product or circuit, and specifically disclaims any and all liability, including without limitation
consequential or incidental damages. “Typical” parameters can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typical”, must be
validated for each customer application by customer’s technical experts.

Freescale does not convey any license under its patent rights nor the rights of others. Freescale
products are not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life, or for any other
application in which the failure of the Freescale product could create a situation where personal
injury or death may occur.

Should Buyer purchase or use Freescale products for any such unintended or unauthorized
application, Buyer shall indemnify and hold Freescale and its officers, employees, subsidiaries,
affiliates, and distributors harmless against all claims, costs, damages, and expenses, and
reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Freescale was
negligent regarding the design or manufacture of the part.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. 2009

Important Notice

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KIT33730EKEVBE Evaluation Board, Rev. 1.0

Introduction

3 Introduction

KIT33730EKEVBE Evaluation Board (EVB) is an easy-to-use circuit board used to exercise all the
functions of the MC33730 multiple output switching power supply. The EVB can be used to easily
manipulate the MC33730 functions and validate the capabilities of the IC. The board provides
connections that allow the user to supply MPCxx MCUs via hard wired connections.

3.1 EVB Features

• Provides all regulated voltages for MPC5XX MCUs and other MCUs logic and analog functions

• Adjustable frequency switching buck regulator with slew-rate control provided by jumpers

• Power sequencing provided

• Programmable voltages VDDL, VDD3 - 3% accuracy (P1, P2, and P3 jumpers)

• Programmable standby regulator VKAM - (P1, P2, and P3 jumpers) operating down to 4.5V at
KA_VBAT pin

• VDD3 can be programmed as an optional second standby regulator (P1, P2, and P3 jumpers)

• Provides two 5.0V protected supplies for sensors

• Provides reverse battery protection FET gate drive (either a diode or PFD gate drive)

• Provides necessary MCU monitoring and fail-safe support

• Pb-free packaging designated by suffix code EK

3.2 Required Equipment

Minimum required equipment: Power supply: 4.5 to 26.5V

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KIT33730EKEVBE Evaluation Board, Rev. 1.0

4 Using Hardware

This EVB consists of a MC33730 switching power supply, power conditioning circuitry, and a set of Input
Select Jumpers. MC33730 Circuit.

4.1 LED Display

Seven LED's are provided as visual output devices for the MC33730 EVB board. A list of the LED devices
is shown below:

1. VDDH LED - Indicates when VDDH supply is operating.

2. VDDL LED - Indicates that the VDDL supply is operating.

3. VDD3 LED - Indicates that the VDD3 supply is operating.

4. VREF1 LED - Indicates that the VREF1 reference is operating.

5. VREF2 LED - Indicates that the VREF2 reference is operating.

6. IGN LED - Indicates Battery supplied to Vign.

7. IGNSW LED - Indicates that the VDD3 supply is operating.

4.2 Selection Jumper Definitions

The EVB contains four jumpers that provide certain selections for the MC33730 as follows (Bold = default
factory setting):

Using Hardware

4.2.1 P1, P2, P3 Jumpers

The P1, P2, and P3 jumpers are used to determine what voltage levels will be supplied by the VDD3,
VDDL and VKAM supplies. The pins are used to hardwire the settings with the MC33730 reading the
values at startup. The table below shows the various conditions that can be set.

P1 P2 P3 VDD3 VDDL VKAM

High

High

High

High

Low

Low

Low

Low

High High 3.3V 2.6V 2.6V

High Low 3.3V 3.3V 3.3V

Low High 3.3V 1.5V 1.0V

Low Low 3.3V 3.3V 1.0V

High High 3.3V Standby 3.3V 1.0V

High Low 2.0 3.15V 5.0V

Low High 2.6V Standby 3.3V 1.0V

Low Low 2.6V Standby 3.3V 1.5V

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KIT33730EKEVBE Evaluation Board, Rev. 1.0

Using Hardware

4.2.2 VDD3 Jumper

In the state where VDD3 is desired to be in standby, the VDD3 jumper is used to short the Base of the
VDD3 transistor to ground. The default case (Normal) is to leave the base connected to VDD3_B.

Jumper should be connected to Normal except for the cases where P1, P2, and P3 are as follows:

P1 P2 P3 VDD3

Low

Low

Low

4.2.3 Slew Rate (SR) Jumper

The Slew Rate Control Jumper Allows For Configurable Slew Rates For The Switching Regulator.
Connected To Boot The Slow Slew Rate Is Active And Connected To Sw The Fast Slew Rate Is Selected.
The Pin Can Be Left Open Which Results In The Medium Slew Rate Control.

SR CONDITION FOR SLEW RATE

Boot

Open

SW

High High 3.3V Standby

Low High 2.6V Standby

Low Low 2.6V Standby

Slow Slew rate

Medium Slew rate

Fast Slew rate

Setup Pins

The 33730 has multiple pins used to do initial setup for the IC. When the IC is powered up a series of
checks are done to determine the P1, P2, P3, HRT, SR and FREQ state.

The P1, P2, and P3 states are connected to jumpers to allow the user to configure the supply rails easily.
Once the IC has determined their state at startup, the status is latched into registers and changing the
jumpers does not affect the operation until the next POR or start up occurs.

The HRT pin is set to 10k. The resistor connected to HRT is R1.

The SR state is determined by the SR jumper. The slew rate of the switching regulator can be selected
to range from slow, medium and fast depending on the location (or open) of the jumper.

The FREQ pin is connected to ground via a 10kohm resistor. This pin resistance to ground determines
the frequency operation of the switching regulator. The resistor connected to FREQ is R9.

Output Supply Pins

There are multiple output power supplies integrated into the integrated circuit.

The main switching regulator, VDDH, 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 VDDH regulator supplies a 5v rail and is
used as the internal power supply for VREF1 and VREF2 along with the external rail for VDD3 and VDDL.

Associated with the VDDH regulator is the INV and VCOMP pins which have been connected to optimize
the compensation for the step down regulator. A bootstrap capacitor is connected from the VSW pin to
the BOOT pin.

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, VREF1 and VREF2, are used to provide power to
external sensors.

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KIT33730EKEVBE Evaluation Board, Rev. 1.0