MC33567 Datasheet, PDF (1/12 Pages) ON Semiconductor – Dual Linear Controller for High Current Voltage Regulation

MC33567
Dual Linear Controller
for High Current
Voltage Regulation
The MC33567 Dual Linear Power Supply Controller is designed to
facilitate power management for motherboard applications where
reliable regulation of high current supply planes is required. It
provides the Drive, Sense and Control signals to interface two
external, N−channel MOSFETs for regulating two different supply
planes. Undervoltage short circuit detection places the operation of the
system into a protected mode pending removal of the short.
Features
• Two Independent Regulated Supplies
• MC33567−1: 1.515 V − Supply for GTL and AGP Planes
1.818 V − Supply for I/O Plane and Memory
Termination
• MC33567−2: Dual 2.525 V Supplies for Clock and Memory
• MC33567−3: 2.3 V − Voltage Supply
1.2 V − Voltage Supply
• Undervoltage Short Circuit Protection
• Supply Undervoltage Detection
• Drive Capability for N−Channel MOSFETs
• Bypass Function for 3.3 V AGP Card Detection
• Pb−Free Package May be Available. The G−Suffix Denotes a
Pb−Free Lead Finish
Applications
• Motherboards
• Dual Power Supplies
http://onsemi.com
8
1
SO−8
D SUFFIX
CASE 751
MARKING
DIAGRAM
M567x
ALYW
x = 1, 2 or 3
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
DRV1 1
SENSE1 2
SHDN1 3
GND 4
8 VCC
7 DRV2
6 SENSE2
5 SHDN2
4
GND
3
SHDN1
8
VCC
5
SHDN2
+
−
+
8.5 V
−
3.3 V
REF
VCC
VCC
66 kW
Startup &
Undervoltage
Shutdown
Control
UVLO
Vin Bypass On (MC33567−1 only)
VCC
3.3 V
REF
VCC
66 kW
Startup &
Undervoltage
Shutdown
Control
REF
3.3 V
1
DRV1
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
2
Vout1
SENSE1
CL
3.3 V
7
DRV2
6
SENSE2
Vout2
CL
Figure 1. Simplified Block Diagram
© Semiconductor Components Industries, LLC, 2003
1
December, 2003 − Rev. 3
Publication Order Number:
MC33567/D