MIC2564A

Micrel

March 2004

1

M0250-031104

Features

• 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

• Ultra-low 1

mA-typical standby power consumption

• Cross-conduction lockout (no switching transients)

• Break-before-make switching

• Lead-free 24-pin surface-mount TSSOP package

• UL recognized, file #179633

Applications

• 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

General Description

The MIC2564A is dual-slot PC Card PCMCIA (Personal Com-

puter Memory Card International Association) and CardBus

power controller. It is a sophisticated power switching matrix

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 supplies,

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 0.3

mA typical

quiescent current.

12V and 5V supplies are not required for MIC2564A operation

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-performance 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, 24-pin TSSOP,

and an environmentally friendly (lead-free) 24-pin TSSOP.

All support documentation can be found on Micrel’s web site

at www.micrel.com.

Typical Application

MIC2564A

Power

Controller

GND

12V

3.3V

5V

System Power Supply

RST#

Serial

Control

Bus

System Reset

Dual-Slot

Logic Controller

PCMCIA,

CardBus,

or Zoom Video

PCMCIA

Card

A

PCMCIA

Card

B

Motherboard

Slot A

Slot B

Address and data lines

between logic controller and

PCMCIA cards not shown.

PCMCIA Card Power Management Application

MIC2564A

Dual Serial PCMCIA/CardBus Power Controller

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