MC33998 データシートの表示（PDF） - Freescale Semiconductor

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MC33998

Switching Power Supply with Linear Regulators

Freescale Semiconductor 

Freescale Semiconductor

Technical Data

Document Number: MC33998

Rev. 2.0, 8/2006

Switching Power Supply with

Linear Regulators

33998

The 33998 is a medium-power, multi-output power supply

integrated circuit that is capable of operating over a wide input

voltage range, from 6.0 V up to 26.5 V with 40 V transient capability.

It incorporates a sensorless current mode control step-down

switching controller regulating directly to 5.0 V. The 2.6 V linear

regulator uses an external pass transistor to reduce the 33998 power

dissipation. The 33998 also provides a 2.6 V linear standby regulator

and two 5.0 V sensor supply outputs protected by internal low-

resistance LDMOS transistors.

There are two separate enable pins for the main and sensor supply

outputs and standard supervisory functions such as resets with

power-up reset delay.

The 33998 provides proper power supply sequencing for

advanced microprocessor architectures such as the MPC5xx and

683xx microprocessor families.

SWITCHING REGULATOR

DW SUFFIX

EG SUFFIX (PB-FREE)

98ASB42344B

24-PIN SOICW

Features

ORDERING INFORMATION

• Operating Voltage Range 6.0 V up to 26.5 V (40 V transient)

• Step-Down Switching Regulator Output VDDH = 5.0 V @

1400 mA (total)

• Linear Regulator with External Pass Transistor VDDL = 2.6 V @

400 mA

Device

MC33998DW/R2

MCZ33998EG/R2

Temperature

Range (TA)

-40°C to 125°C

Package

24 SOICW

• Low-Power Standby Linear Regulator VKAM = 2.6 V @ 10 mA

• Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected

Against Short-to-Battery and Short-to-Ground with Retry Capability

• Undervoltage Shutdown on the VDDL, VDDH Outputs with Retry Capability

• Reset Signals

• Power-Up Delay

• Enable Pins for Main Supplies (EN) and Sensor Supplies (SNSEN)

• Power Sequencing for Advanced Microprocessor Architectures

• Pb-Free Packaging Designated by Suffix Code EG

33998

KA_VPWR

VSW

VPWR

VDDH

5.0 V

VDDH

5.0 V

VREF1

DRVL

5.0 V

VREF2

FBL

EN

SNSEN

GND

VKAM

PWROK

VKAMOK

MCU

VDDL

2.6 V

VKAM

2.6 V

Figure 1. 33998 Simplified Application Diagram

Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as

may be required, to permit improvements in the design of its products.

© Freescale Semiconductor, Inc., 2007. All rights reserved.

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