MAX1812 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Dual USB Switch with Fault Blanking

19-1865; Rev 0; 11/00
Dual USB Switch with Fault Blanking
General Description
The MAX1812 is a dual current-limited switch specifi-
cally made for USB applications. Each channel is guar-
anteed to supply 500mA and meets USB specifications.
The MAX1812’s low quiescent supply current (45µA)
and shutdown current (3µA) conserve battery power in
portable applications.
The MAX1812 has multiple safety features to ensure
that the USB port is protected. Built-in thermal-overload
protection limits power dissipation and junction temper-
ature. The device also has accurate internal current-lim-
iting circuitry to protect the input supply against both
overload and short-circuit conditions. Independent fault
signals (FAULTA and FAULTB) notify the microproces-
sor when a thermal-overload, current limit, undervoltage
lockout, or short-circuit fault occurs. A 20ms fault-blank-
ing feature enables the circuit to ignore momentary
faults, such as those caused when hot-swapping a
capacitive load, thereby preventing false alarms to the
host system.
The MAX1812 is available in a space-saving 10-pin
µMAX package. For single versions of this device, refer
to the MAX1693, MAX1694, and MAX1607 data sheets.
________________________Applications
USB Ports
USB Hubs
Notebook Computers
Desktop Computers
PDAs and Palmtop Computers
Docking Stations
Features
o Dual USB Switch in Tiny 10-Pin µMAX Package
o Guaranteed 500mA Load per Channel
o Built-In 20ms Fault Blanking
o Compliant to USB Specifications
o +4.0V to +5.5V Input Voltage Range
o 45µA Quiescent Current
o 3µA Shutdown Current
o Independent Shutdown Control
o Independent FAULT Indicator Outputs
o Thermal-Overload Protection
o UL Listing Pending
PART
MAX1812EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
INPUT
4.0V TO 5.5V
Typical Operating Circuit
INA
OUTA
IN
INB
USB
PORT A
MAX1812
FAULTA
OUTB
FAULTB
ONA
ONA
ONB
ONB GND
USB
PORT B
TOP VIEW
Pin Configuration
ONA 1
INA 2
IN 3
INB 4
ONB 5
MAX1812
µMAX
10 FAULTA
9 OUTA
8 GND
7 OUTB
6 FAULTB
________________________________________________________________ Maxim Integrated Products 1
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