MAX1922 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 1A Current-Limited Switch for 2 USB Ports

19-2254; Rev 1; 12/02
1A Current-Limited Switch for 2 USB Ports
General Description
The MAX1922 current-limited 70mΩ switch with built-in
fault blanking provides an accurate, preset 1.4A to 2.1A
current limit, making it ideal for dual USB applications.
Its low quiescent supply current (16µA) and standby
current (1µA) conserve battery power in portable appli-
cations. The MAX1922 operates with inputs from 2.7V
to 5.5V, making it ideal for both 3V and 5V systems.
An overcurrent signal (OC) notifies the microprocessor
that the internal current limit has been reached. A 10ms
overcurrent-blanking 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 blanking also prevents
an OC signal from being issued when the device is
powering up.
The MAX1922 has several safety features to ensure that
the USB port is protected. Built-in thermal-overload pro-
tection limits power dissipation and junction tempera-
ture. The device also has accurate internal current-
limiting circuitry to protect the input supply against
overload.
The MAX1922 is offered in a space-saving 8-pin SO
package and operates over the extended (-40°C to
+85°C) temperature range.
Notebook Computers
USB Ports
USB Hubs
Docking Stations
Applications
Features
♦ Accurate Current Limit (1.4A min, 2.1A max)
♦ 10ms Internal OC Blanking Timeout
♦ OC Blanking During Power-Up
♦ 125mΩ max High-Side MOSFET
♦ Short-Circuit and Thermal Protection with
Overcurrent Logic Output
♦ Undervoltage Lockout
♦ 16µA Quiescent Supply Current
♦ 1µA (max) Standby Supply Current
♦ 2.7V to 5.5V Supply Range
♦ UL Recognized: UL# E211935
PART
MAX1922ESA
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Pin Configuration
Typical Operating Circuit
TOP VIEW
GND 1
IN 2
IN 3
EN 4
MAX1922
8 OUT
7 OUT
6 OUT
5 OC
SO
INPUT
2.7V TO 5.5V
OFF
ON
IN
OUT
MAX1922
OC
EN
GND
OUTPUT
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