MAX1562_09 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Programmable 4A USB Current-Limited Switches with Autoreset and Fault Blanking

19-2631; Rev 1; 7/09
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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
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
o UL Certification Pending
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*
4mm x 4mm
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
IN
INPUT
4V TO 5.5V
IN
FAULT
MAX1562
MAX1562H
ON ^MAX1563
ACTIVE-HIGH/ACTIVE-LOW
SELECTABLE
SEL
MAX1563
ONLY
OUT
USB
PORT
ISET
OUT
GND
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.