MIC2564A
Micrel
MIC2564A
Dual Serial PCMCIA/CardBus Power Controller
Preliminary Information
General Description
The MIC2564A is dual-slot PC Card (PCMCIA) and CardBus
power controller. It is a sophisticated power switching matrix
that controls V
CC
and V
PP
voltages to two PC Card slots. The
MIC2564A is used in conjunction with a serial-data output
logic controller using the standard three-wire serial control
data format.
When connected to 3.3V, 5V, and 12V system power sup-
plies, the MIC2564A can switch its V
CC
outputs between 0V,
3.3V, 5.0V, and high-impedance states and V
PP
outputs
between 0V, 3.3V, 5V, 12V, and high-impedance states. The
V
CC
outputs will supply a minimum of 1A current to the socket
and the V
PP
outputs will supply a minimum of 120mA to the
socket. Voltage rise and fall times are well controlled. The
MIC2564A also features an efficient standby (sleep) mode at
0.3µA typical quiescent current.
12V and 5V supplies are not required for MIC2564A opera-
tion making it possible to omit one or both supplies when they
are not needed by the system. An internal charge pump
supplies the internal bias voltages required for high-perfor-
mance switching.
The MIC2564A is protected by overtemperature shutdown,
and protects itself and the system with current limiting and
cross-conduction lockout.
The MIC2564A is available in 24-pin SSOP and 24-pin
TSSOP.
Features
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Standard 3-wire serial control data input
Controls two card slots from one surface mount device
High-efficiency, low-resistance switches
12V supply optional (not required by MIC2564A)
Current limit and overtemperature shutdown
Ultralow 1µA-typical standby power consumption
Cross-conduction lockout (no switching transients)
Break-before-make switching
1A minimum V
CC
output per slot
Independent V
CC
and V
PP
voltage output (MIC2564A-1)
120mA minimum V
PP
output current per slot
24-pin surface-mount SSOP and TSSOP packages
PC Card and CardBus power control
Zoom Video port power control
Wireless communications
Bar code data collection systems
Docking stations (portable and desktop)
Power supply management
Applications
Ordering Information
Part Number
MIC2564A-0BSM
MIC2564A-1BSM
MIC2564A-0BTS
MIC2564A-1BTS
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
24-pin SSOP
24-pin SSOP
24-pin TSSOP
24-pin TSSOP
Typical Application
Slot A
Address and data lines
between logic controller and
PCMCIA cards not shown.
System Power Supply
(
OPTIONAL
)
(
OPTIONAL
)
12V
5V
3.3V
V
PP
1
V
PP
2
PCMCIA
Card
A
V
CC
System Reset
V
PP
IN
(
OPTIONAL
)
Dual-Slot
Logic Controller
PCMCIA,
CardBus,
or Zoom Video
RST#
Serial
Control
Bus
MIC2564A
Power
Controller
V
CC3
IN
V
CC5
IN
(
OPTIONAL
)
A V
PP
OUT
A V
CC
OUT
B V
PP
OUT
GND
B V
CC
OUT
V
PP
1
V
PP
2
PCMCIA
Card
B
Slot B
V
CC
Motherboard
PCMCIA Card Power Management Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
September 1999
1
MIC2564A
MICREL [ MICREL SEMICONDUCTOR ]
