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Motorola Electronic Components Datasheet

MC33997 Datasheet

Switching Power Supply

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Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33997/D
Rev 3.0, 03/2003
Advance Information
Switching Power Supply with Linear
Regulators
The 33997 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
3.3 V linear regulator uses an external pass transistor to reduce the 33997
power dissipation. The 33997 also provides a 3.3 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 33997 provides proper power supply sequencing for advanced
microprocessor architectures such as the Motorola 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 = 3.3 V @ 400 mA
• Low-Power Standby Linear Regulator VKAM = 3.3 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
• SOIC-24WB Package
33997
POWER SUPPLY
INTEGRATED CIRCUIT
DW SUFFIX
24-LEAD SOICW
CASE 751E
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33997DW/R2 -40°C to 125°C
24 SOICW
33997 Simplified Application Diagram
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2003
For More Information On This Product,
Go to: www.freescale.com


Motorola Electronic Components Datasheet

MC33997 Datasheet

Switching Power Supply

No Preview Available !

Freescale Semiconductor, Inc.
VPW R
KA_VPW R
5.0 V VRE F1
5.0 V VRE F2
339 97
I -lim
S oft
Start
Enb
O sc
Logic
&
Latch
D r iv e
Ramp
V bg
Retry
VREF1
Reg.
B andgap
Voltage
Vbg
S nsenb Reference
Retry
VREF2
Reg.
Sns e nb
Sn senb
En able
Co ntrol E nb
Enb 3.3V
Lin ear
Re gulat or
D r i ver
POR
Enb
Vbg
3.3V
S ta ndb y
R eg .
Charge
Pump
PwrOK
Vk am OK
VSW
5.0 V
FBKB
VSUM
VDD H
DR VL
FBL
3.3 V
V KAM
3.3 V
PWROK
VKAMOK
CR ES
SNSEN
EN
GND
Figure 1. 33997 Simplified Block Diagram
33997
2
For More Information OMnOTTOhRiOsLAPrAoNdALuOcGt,INTEGRATED CIRCUIT DEVICE DATA
Go to: www.freescale.com


Part Number MC33997
Description Switching Power Supply
Maker Motorola
PDF Download

MC33997 Datasheet PDF






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