MIC2568 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – Dual-Slot PC Card/CardBus Power Controller

MIC2568
Micrel
MIC2568
Dual-Slot PC Card/CardBus Power Controller
Preliminary
General Description
The MIC2568 dual-slot PC Card / CardBus power controller
is a V_CC and V_PP power switch matrix that supports 3.3V and
5V PC Card (PCMCIA) slot power supply pins.
The MIC2568 can switch PC Card slot V_CC voltages between
0V (ground), 3.3V and 5.0V and V_PP voltages between 0V
(ground), 3.3V, 5V, or high impedance at output currents of
up to 1A for V_CC and 250mA for V_PP. The MIC2568 features
well-controlled voltage rise and fall times. Each MIC2568
output voltage is switched by two digital inputs, typically
controlled from a separate PC Card logic controller.
The MIC2568 is designed for efficient operation. In standby
(sleep) mode the device draws very little quiescent current,
typically only 0.3µA. The power controller includes thermal
shutdown and protects itself and its PC Card ports with
current limiting. Full cross-conduction lockout protects the
system power supplies.
The MIC2568 is available in 28-pin SSOP and TSSOP
packages.
Features
• Complete single-chip dual-slot power switch
• No external components required
• Output current limit and thermal shutdown
• Ultra-low power consumption
• Compatible with standard PC Card logic controllers
• Break-before-make switching (no transients)
• Digital V_CC and V_PP voltage selection
• > 1A V_CC output current per slot
• > 200mA V_PP output current per slot
• 28-pin SSO and TSSO package
• Pb-free 28-pin SSO package
• UL recognized, file #179633
Applications
• Dual-slot PC Card power supply voltage switch
• CardBus slot power supply control
• Data collection systems
• Machine control data input systems
• Wireless communications
• Bar code data collection systems
• Instrumentation configuration/datalogging
• Portable and desktop computer docking stations
• Power supply management
• Power analog switching
Typical Application
Independent supply
inputs can be used with
two system power supplies.
(Single system supply shown.)
System Power Supply
3.3V
(OPTIONAL )
5V
Address and data lines
between logic controller and
PCMCIA cards not shown.
Dual-Slot
PC Card
Logic Controller
A V_CC3 IN
A V_CC5 IN
(OPTIONAL)
A EN1
A EN0
A V_CC5 EN
A V_CC3 EN
B EN1
A V_PP OUT
A V_CC OUT
MIC2568
Power
Controller
GND
B EN0
B V_CC5 EN
B V_CC3 EN
B V_CC3 IN
B V_PP OUT
B V_CC OUT
(OPTIONAL)
B V_CC5 IN
Slot A
V_PP1
V_PP2
V_CC
V_CC
Slot B
V_PP1
V_PP2
V_CC
V_CC
PC Card
A
PC Card
B
Motherboard
Dual-Slot PC Card Power Control
UL Recognized Component
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
May 2003
1
MIC2568