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MAX1945REUI, MAX1946, MAX1946ETA

Table of contents:
Info of MAX1945REUI
Info of MAX1946
Info of MAX1946ETA

MAX1945REUI, MAX1946, MAX1946ETA Selling Leads, Datasheet

MFG:MAXIM Package Cooled:SSOP-28 D/C:0421+

MAX1945REUI, MAX1946, MAX1946ETA Picture

MAX1945REUI, MAX1946, MAX1946ETA Datasheet download

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Part Number: MAX1945REUI

MFG: MAXIM

Package Cooled: SSOP-28

D/C: 0421+

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MAX1946 General Description

The MAX1946 single current-limited switch with autoreset supplies a guaranteed 500mA load in accordance with USB specifications. The MAX1946 operates from a 2.7V to 5.5V input supply and consumes only 40µA of quiescent current when operating and only 3µA in shutdown. Selectable active-high/active-low control logic and shutdown control provide additional flexibility. An autoreset feature latches the switch off in the event of a short circuit, saving system power. The switch reactivates upon removal of the shorted condition.

The MAX1946 provides 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 current-limiting circuitry protects the input supply against both overload and shortcircuit conditions. An open-drain fault signal, (FAULT), notifies the microprocessor (µP) when a thermal overload, current-limit, undervoltage lockout (UVLO), or short-circuit fault occurs. A 20ms 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. The faultblanking feature prevents fault signals from being issued when the device powers up the load.

The MAX1946 is available in a space-saving 8-pin thin QFN package and operates over the extended (-40°C to +85°C) temperature range.

MAX1946 Maximum Ratings

IN, ON, OUT, SEL to GND..........................................-0.3V to +6V
FAULT to GND...............................................-0.3V to (V_IN + 0.3V)
IN to OUT..................................................................-0.3V to +6V
OUT Continuous Switch Current (internally limited)..............1.3A
FAULT DC Current................................................................10mA
Continuous Power Dissipation (T_A= +70°C)
Exposed Pad Must be Soldered to PC Board
8-Pin QFN (derate 24.4mW/°C above +70°C) ...........1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C

MAX1946 Features

Single USB Switch in 3mm x 3mm Package
Autoreset Feature Saves System Power
Guaranteed 500mA Load Current
Built-In 20ms Fault-Blanking Circuitry
Active-High or Active-Low Control Logic
Fully Compliant to USB Specifications
2.7V to 5.5V Input Voltage Range
Fault-Indicator Output
Thermal-Overload Protection
UL Certification Pending

MAX1946 Typical Application

USB Ports and USB Hubs
Notebook and Desktop Computers
PDAs and Palmtop Computers
Digital Cameras
Docking Stations

MAX1946 Connection Diagram

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