MAX1601 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Dual-Channel CardBus and PCMCIA Power Switches with SMBus™ Serial Interface

19-1085; Rev 1; 10/96
Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
________________General Description
The MAX1601/MAX1604 DC power-switching ICs con-
tain a network of low-resistance MOSFET switches that
deliver selectable VCC and VPP voltages to two
CardBus or PC Card host sockets. Key features include
ultra-low-resistance switches, small packaging, soft-
switching action, and compliance with PCMCIA specifi-
cations for 3V/5V switching. 3.3V-only power switching
for fast, 32-bit CardBus applications is supported in two
ways: stiff, low-resistance 3.3V switches allow high 3.3V
load currents (up to 1A); and completely independent
internal charge pumps let the 3.3V switch operate nor-
mally, even if the +5V and +12V supplies are discon-
nected or turned off to conserve power. The internal
charge pumps are regulating types that draw reduced
input current when the VCC switches are static. Also,
power consumption is automatically reduced to 10µA
max when the switches are programmed to high-Z or
GND states over the serial interface, unlike other solu-
tions that may require a separate shutdown-control
input.
Other key features include guaranteed specifications for
output current limit level, and guaranteed specifications
for output rise/fall times (in compliance with PCMCIA
specifications). Reliability is enhanced by thermal-over-
load protection, accurate current limiting, an overcur-
rent-fault flag output, undervoltage lockout, and extra
ESD protection at the VCC/VPP outputs. The SMBus ser-
ial interface is flexible, and can tolerate logic input levels
in excess of the positive supply rail.
The MAX1604 and MAX1601 are identical, except
for the MAX1604’s VY switch, which has roughly three-
times the on-resistance (typically 140mΩ).The
MAX1601/MAX1604 fit two complete CardBus/PCMCIA
switches into a space-saving, narrow (0.2in. or 5mm
wide) SSOP package.
________________________Applications
Desktop Computers Data Loggers
Notebook Computers Digital Cameras
Docking Stations
Printers
Handy-Terminals
PCMCIA Read/Write Drives
Pin Configuration appears on last page.
SMBus is a trademark of Intel Corp.
____________________________Features
o Supports Two CardBus Sockets
o 1A, 0.08Ω Max VY VCC Switch (MAX1601 only)
1A, 0.14Ω Max VX VCC Switch
o Soft Switching for Low Inrush Surge Current
o Overcurrent Protection
o Overcurrent/Thermal-Fault Flag Output
o Thermal Shutdown at T_j = +150°C
o Independent Internal Charge Pumps
o Break-Before-Make Switching Action
o 10µA Max Standby Supply Current
o 5V and 12V Not Required for Low-R_DS(ON) 3.3V
Switching
o Complies with PCMCIA 3V/5V Switching
Specifications
o Super-Small, 28-Pin SSOP Package
(0.2in. or 5mm wide)
o System Management Bus (SMBus) Serial
Interface
_______________Ordering Information
PART
MAX1601EAI
MAX1604EAI
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
__________Simplified Block Diagram
12IN
VY
VY
VX
VX
VL
SMBCLK
SMBDATA
SMBSUS
GND
12IN
VY
VX
MAX1601/MAX1604
VDD
DECODE
LOGIC
ADDRESS
SELECT
OVERCURRENT
AND
THERMAL
SHUTDOWN
VPPA
VCCA
VCCA
VCCA
SMBALERT
ADR
VPPB
VCCB
VCCB
VCCB
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