MAX1931 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Current-Limited Switch for Single USB Port

19-2357; Rev 0; 4/02
Current-Limited Switch for Single USB Port
General Description
The MAX1931 is a current-limited, 60mΩ switch with
built-in fault blanking. Its accurate preset current limit of
0.64A to 1.06A makes it ideally suited for USB applica-
tions. The device’s low quiescent supply current (14µA)
and shutdown current (1µA) conserve battery power in
portable applications. The MAX1931 operates with
inputs from 2.7V to 5.5V, making it ideal for both 3V and
5V systems.
A fault signal notifies the microprocessor that the inter-
nal current limit has been reached. A 10ms fault-blank-
ing feature allows momentary faults (such as those
caused when hot-swapping into a capacitive load) to be
ignored, thus preventing false alarms to the host system.
This fault blanking also prevents a fault signal from
being issued when the device is powering up.
In the MAX1931, an output overcurrent condition causes
the switch to current limit at 0.64A to 1.06A and FAULT
to go low after the 10ms blanking period. When the
overcurrent condition is removed, FAULT returns to its
high-impedance state.
The MAX1931 has several safety features to ensure that
the USB port is protected. Built-in thermal overload
protection limits power dissipation and junction tempera-
tures. The device has an accurate internal current-limit-
ing circuitry to protect the input supply against overload.
The MAX1931 is available in a space-saving 10-pin
µMAX package.
Applications
USB Ports and Hubs
Notebook Computers
Portable Equipment
Docking Stations
Hot Plug-In Power Supplies
Battery-Charger Circuits
Features
o 0.5A Guaranteed Output Current
o Guaranteed 0.75A Short-Circuit Protection
o 10ms Internal Fault-Blanking Timeout
o No Fault Signal During Power-Up
o Thermal Shutdown Protection
o 2.7V to 5.5V Supply Range
o 14µA Supply Current
o Small 10-Pin µMAX Package
PART
MAX1931EUB
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
10µMAX
Pin Configuration
TOP VIEW
IN 1
OUT 2
IN 3
OUT 4
ON 5
MAX1931
µMAX
10 OUT
9 IN
8 OUT
7 FAULT
6 GND
Typical Operating Circuit
INPUT
2.7V TO 5.5V
IN
OUT
OUTPUT
OFF
ON
MAX1931
FAULT
ON
GND
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.