MAX1562_10 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Programmable 4A USB Current-Limited Switches with Autoreset and Fault Blanking

19-2631; Rev 2; 2/10
EVAALVUAAILTAIOBNLEKIT
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
General Description
The MAX1562/MAX1562H/MAX1563 single current-
limited switches provide up to 4A to power up to eight
USB ports. They operate from a 4V to 5.5V input
supply and consume only 40µA of quiescent current
when operating and only 3µA in shutdown.
The MAX1562/MAX1562H/MAX1563s’ autoreset feature
latches the switch off if the output is shorted, thereby
saving system power. When the short is removed, the
switch is reactivated. A fault-blanking feature enables the
circuit to ignore momentary faults, such as those caused
when hot swapping a capacitive load, preventing false
alarms to the host system. Fault blanking also prevents
fault signals from being issued when the device powers
up the load.
The MAX1562/MAX1562H/MAX1563 provide several
safety features to protect the USB port. Built-in thermal-
overload protection turns off the switch when the die
temperature exceeds +160°C. Accurate internal cur-
rent-limiting circuitry protects the input supply against
both overload and short-circuit conditions. An open-
drain fault signal (FAULT) notifies the microprocessor
when a thermal-overload, current-limit, undervoltage
lockout (UVLO), or short-circuit fault occurs.
The MAX1562 has an active-low ON, and the
MAX1562H has an active-high ON enable input. The
MAX1563 has a selectable active-high or active-low
logic-controlled enable. The current limit is pro-
grammed from 1A to 4A using a resistor.
The MAX1562/MAX1562H are available in 8-pin SO
packages and are pin-compatible upgrades to the
MIC2545A/MIC2549A. The MAX1563 provides the
same features and higher current performance in a
smaller 12-pin (4mm x 4mm) Thin QFN package. These
devices operate over an extended temperature range
(-40°C to +85°C). An evaluation kit is available to speed
designs.
Applications
Notebook Computers
Desktop Computers
USB Ports and Hubs
PDAs and Palmtop Computers
Docking Stations
Pin Configurations appear at end of data sheet.
Features
o Programmable Current Limit (1A to 4A) with
Resistor
o Autoreset Feature Saves System Power
o 20ms Fault-Blanking Circuitry
o Active-High/Low Control Logic
o Fault-Indicator Output
o Thermal-Overload Protection
o Smaller 4mm x 4mm Thin QFN Package (MAX1563)
o 3µA Shutdown Current
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1562ESA+
-40°C to +85°C 8 SO
MAX1562HESA+
-40°C to +85°C 8 SO
MAX1563ETC+
-40°C to +85°C 12 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
IN
INPUT
4V TO 5.5V
IN
FAULT
MAX1562
MAX1562H
MAX1563
ON
ACTIVE-HIGH/ACTIVE-LOW
SELECTABLE
SEL
MAX1563
ONLY
OUT
USB
PORT
ISET
OUT
GND
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