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 V
DDH
= 5.0 V @
1400 mA (total)
" Linear Regulator with External Pass Transistor V
DDL
= 2.6 V @
400 mA
" Low-Power Standby Linear Regulator V
KAM
= 2.6 V @ 10 mA
" Two 5.0 V @ 200 mA (typical) Sensor Supplies V
REF
Protected
Against Short-to-Battery and Short-to-Ground with Retry Capability
" Undervoltage Shutdown on the V
DDL
, V
DDH
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 (T
A
)
Package
MC33998DW/R2
-40癈 to 125癈
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
V
DDH
V
KAM
V
DDL
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