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MC33998 Scheda tecnica(PDF) 1 Page - Freescale Semiconductor, Inc

Il numero della parte MC33998
Spiegazioni elettronici  Switching Power Supply with Linear Regulators
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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Document Number: MC33998
Rev. 2.0, 8/2006
Freescale Semiconductor
Technical Data
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.
Switching Power Supply with
Linear Regulators
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.
Features
• 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
• 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
Figure 1. 33998 Simplified Application Diagram
SWITCHING REGULATOR
DW SUFFIX
EG SUFFIX (PB-FREE)
98ASB42344B
24-PIN SOICW
33998
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33998DW/R2
-40°C to 125°C
24 SOICW
MCZ33998EG/R2
5.0 V
33998
5.0 V
5.0 V
2.6 V
2.6 V
MCU
SNSEN
VREF1
VPWR
KA_VPWR
GND
EN
VSW
VDDH
DRVL
FBL
PWROK
VKAM
VKAMOK
VREF2
VDDH
VKAM
VDDL


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