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Freescale Semiconductor Electronic Components Datasheet

MC33998 Datasheet

Switching Power Supply

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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
www.DataSheeto4uUtp.cuotms 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.


Freescale Semiconductor Electronic Components Datasheet

MC33998 Datasheet

Switching Power Supply

No Preview Available !

INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VPWR
www.DataSheet4U.com
KA_ VPW R
5.0 V VREF1
5.0 V VREF2
3 39 98
I -lim
Sof t
S tar t
E nb
Osc
Lo gic
&
La tch
Drive
Ramp
V bg
Ret ry
VRE F1
Re g.
Ba n dga p
Volta ge
Vb g
Snsenb Reference
Ret ry
VRE F2
Re g.
S nse nb
Sn sen b
En ab le
Control Enb
Enb 2.6V
L inea r
Reg ulat or
Driver
P OR
En b
V bg
2 .6V
Sta nd by
Reg .
Cha rg e
P um p
PwrO K
VkamOK
V SW
5.0 V
FBK B
V SUM
V DDH
DRV L
FBL
2.6 V
V KAM
2.6 V
PWRO K
VKA MO K
CRES
SNSE N
EN
PG ND
Figure 2. 33998 Simplified Internal Block Diagram
33998
2
Analog Integrated Circuit Device Data
Freescale Semiconductor


Part Number MC33998
Description Switching Power Supply
Maker Freescale Semiconductor
Total Page 20 Pages
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