CALIFORNIA MICRO DEVICES
V
CC
power-up with – V
AUX
=3.6V
AP-211
The board interfaces to the following signals:
Input power supply voltages V
CC
, V
SBY
, V
AUX
, and GND.
Output voltage and signal: V
OUT
and STATUS (or
DRIVE).
It provides pad layouts for mounting two decoupling chip
capacitors for each input and output of the device, as well as
for a SOT-23 external P-channel MOSFET switch for the
CMPWR150.
Heat spreaders are provided on the printed circuit board to
improve the power dissipation for the regulator devices (i.e.
CMPWR100). These are used when the devices operate under
a high current load or heating condition. Various sizes of heat
spreaders are provided with a copper area of up to 2 inch
2
.
Conclusion
Ch1: V
CC
, offset 4.1V
Ch2: V
OUT
, offset 3.3V
Ch3: DRIVE
Figure 14
V
CC
power-up from 0V to 5V (cold-start) with V
AUX
open
Bad test set-up with total series resistance of 0.7
Ω
on V
CC
,
by using an additional resistor of 0.5
Ω.
devices to provide regulated voltage sources and smart switches
between power sources. California Micro Devices provides
high performance integrated solutions to reduce component
count and ease the design and manufacturing cycles. California
Micro Devices SmartOR
TM
products allow interface card
manufacturers to meet the power requirements of IAPC. To
find a solution to your specific requirement, call California
Micro Devices for applications assistance.
References
I
nstantly Available PCs require unique Power Management
[1] CMPWR100 data sheet, 200mA Dual Input Power
Management Circuit, Rev. 9/99, California Micro Devices.
[2] CMPWR150 data sheet, 500mA / 3.3V SmartOR
TM
Power Regulator, Rev. 9/99, California Micro Devices.
[3] CMPWR025 data sheet, 500mA Dual Input SmartOR
TM
Power Switch, Rev. 9/99, California Micro Devices.
Ch1: V
CC
, offset 4.1V
Ch2: V
OUT
Ch3: DRIVE
Figure 15
[4] Instantly Available Power Managed Desktop PC,
Design Guide, Rev. 1.2, 9/25/98, Intel Corp.
[5] Instantly Available PC, System Power Delivery
Requirements and Recommendations, Rev. 1.0, 12/30/97,
Intel Corp.
[6] PCI Bus Power Management Interface Specification
Rev. 1.1, 12/18/98, PCI Special Interest Group.
Figure 15 shows a cold-start power-up transition for a test
set-up with a total series resistance of 0.7
Ω
on V
CC
. This is
described in the cold-start behavior paragraph.
The SmartOR
TM
evaluation board is intended to facilitate the
use of California Micro Devices Power Management device
family, and will accommodate any individual device with
installation one at a time on the board. For example, operating
the CMPWR100 requires populating that device and the
external capacitors around it. To obtain a board, simply contact
your local California Micro Devices Sales Representative or
call the Factory direct at 1-(800) 325-4966 and ask to be
connected to Applications.
Evaluation Board
9/99
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
7
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
