May 2003

1

MIC2568

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

5V PC Card (PCMCIA) slot power supply pins.

The MIC2568 can switch PC Card slot V

0V (ground), 3.3V and 5.0V and V

(ground), 3.3V, 5V, or high impedance at output currents of

up to 1A for V

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 0.3

µA. 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.

Typical Application

MIC2568

Power

Controller

GND

3.3V

5V

System Power Supply

Dual-Slot

PC Card

Logic Controller

PC Card

A

PC Card

B

Motherboard

Slot A

Slot B

Address and data lines

between logic controller and

PCMCIA cards not shown.

A EN1

A EN0

B EN1

B EN0

Independent supply

inputs can be used with

two system power supplies.

(Single system supply shown.)

Dual-Slot PC Card Power Control

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

• > 1A V

• > 200mA V

• 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

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

UL Recognized Component