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MAX1940 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX1940
Description  Triple USB Switch with Autoreset and Fault Blanking
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Maker  MAXIM [Maxim Integrated Products]
Homepage  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1940 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX1940 triple current-limited switch with auto-
reset supplies a guaranteed 500mA load per channel in
accordance with USB specifications. The MAX1940
operates from a 4V to 5.5V input supply and consumes
only 60µA of quiescent current when operating and only
3µA in standby. Selectable active-high/active-low con-
trol logic and independent shutdown controls for each
channel provide additional flexibility. An autoreset fea-
ture latches the switch off in the event of a short circuit,
saving system power. The switch reactivates upon
removal of the shorted condition.
The MAX1940 provides several safety features to pro-
tect the USB port. Built-in thermal-overload protection
turns off the switch when the die temperature exceeds
+160°C. Accurate internal current-limiting circuitry pro-
tects the input supply against both overload and short-
circuit conditions. Independent open-drain fault signals
(FAULTA, FAULTB, and FAULTC) notify the micro-
processor when a thermal-overload, current-limit,
undervoltage lockout (UVLO), or short-circuit fault
occurs. A 20ms fault-blanking feature enables the cir-
cuit to ignore momentary faults, such as those caused
when hot-swapping a capacitive load, preventing false
alarms to the host system. The fault-blanking feature
also prevents fault signals from being issued when the
device powers up the load.
The MAX1940 is available in a space-saving 16-pin
QSOP package and operates over the extended (-40°C
to +85°C) temperature range.
Applications
Features
o Triple USB Switch in Tiny 16-Pin QSOP Package
o Autoreset Feature Saves System Power
o Guaranteed 500mA Load Current per Channel
o Built-In 20ms Fault-Blanking Circuitry
o Active-High/Active-Low Control Logic
o Fully Compliant to USB Specifications
o 4V to 5.5V Input Voltage Range
o Independent Shutdown Control
o Independent Fault Indicator Outputs
o Thermal-Overload Protection
o 3µA Standby Current
o UL Certification Pending
Triple USB Switch with Autoreset and
Fault Blanking
________________________________________________________________ Maxim Integrated Products
1
IN1
IN2
IN3
IN4
IN5
ONA
ONB
ONC
SEL
FAULTA
FAULTB
FAULTC
OUTA
OUTB
OUTC
GND
MAX1940
INPUT
4V TO 5.5V
USB
PORT A
USB
PORT B
USB
PORT C
ACTIVE-HIGH/ACTIVE-LOW
SELECTABLE
Typical Operating Circuit
Ordering Information
19-2497; Rev 0; 7/02
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.
PART
TEMP RANGE
PIN-PACKAGE
MAX1940EEE
-40°C to +85°C
16 QSOP
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
ONA
FAULTA
OUTA
GND
OUTB
FAULTB
SEL
OUTC
FAULTC
TOP VIEW
MAX1940
QSOP
IN1
IN2
IN4
IN3
ONB
IN5
ONC
Pin Configuration
USB Ports
USB Hubs
Notebook Computers
Desktop Computers
PDAs and Palmtop
Computers
Docking Stations


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