MAX1946ETA+T Maxim Integrated Products, MAX1946ETA+T Datasheet

IC SW USB SNGL W/FB 8-TDFN

MAX1946ETA+T

Manufacturer Part Number
MAX1946ETA+T
Description
IC SW USB SNGL W/FB 8-TDFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1946ETA+T

Applications
USB, Peripherals
Current - Supply
40µA
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TDFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1946 single current-limited switch with auto-
reset 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 shut-
down. 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 reacti-
vates upon removal of the shorted condition.
The MAX1946 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. An open-drain fault signal, (FAULT),
notifies the microprocessor (µP) when a thermal over-
load, 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 fault-
blanking feature prevents fault signals from being
issued when the device powers up the load.
The MAX1946 is available in a space-saving 8-pin
(3mm x 3mm) TDFN package and operates over the
extended (-40°C to +85°C) temperature range.
19-2550; Rev 3; 2/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
USB Ports and USB Hubs
Notebook and Desktop Computers
PDAs and Palmtop Computers
Digital Cameras
Docking Stations
TOP VIEW
FAULT
GND
OUT
OUT
________________________________________________________________ Maxim Integrated Products
1
2
4
3
+
Single USB Switch with Autoreset and
General Description
MAX1946
TDFN
Pin Configuration
Applications
6
8
7
5
SEL
IN
ON
IN
Fault Blanking in Tiny TDFN
o Single USB Switch in 3mm x 3mm Package
o Autoreset Feature Saves System Power
o Guaranteed 500mA Load Current
o Built-In 20ms Fault-Blanking Circuitry
o Active-High or Active-Low Control Logic
o Fully Compliant to USB Specifications
o 2.7V to 5.5V Input Voltage Range
o Fault-Indicator Output
o Thermal-Overload Protection
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed paddle.
MAX1946ETA+
2.7V TO 5.5V
INPUT
PART
ACTIVE HIGH
SELECTABLE
ACTIVE LOW
Typical Operating Circuit
-40°C to +85°C
TEMP RANGE
Ordering Information
IN
IN
ON
SEL
MAX1946
GND
8 TDFN-EP*
PACKAGE
PIN-
FAULT
OUT
OUT
Features
TOP MARK
ACQ
1

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MAX1946ETA+T Summary of contents

Page 1

... OUT 3 OUT 4 TDFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Fault Blanking in Tiny TDFN o Single USB Switch in 3mm x 3mm Package o Autoreset Feature Saves System Power o Guaranteed 500mA Load Current ...

Page 2

Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN ABSOLUTE MAXIMUM RATINGS IN, ON, OUT, SEL to GND........................................-0.3V to +6V FAULT to GND .............................................-0. OUT..................................................................-0.3V to +6V OUT Continuous Switch Current (internally limited)..............1.3A FAULT ...

Page 3

Single USB Switch with Autoreset and ELECTRICAL CHARACTERISTICS (continued 5V 0.1µ 1µ OUT A PARAMETER SYM ON, SEL Input High Level ON, SEL Input Low Level ON, SEL ...

Page 4

Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN ELECTRICAL CHARACTERISTICS (continued 5V 0.1µ 1µ OUT A PARAMETER SYM Turn-Off Delay ON, SEL Input High Level ...

Page 5

Single USB Switch with Autoreset and (Circuit of Figure 5V 0.1µ SWITCH OFF-LEAKAGE vs. TEMPERATURE 1000 ON = OUT = GND SEL 100 10 1 0.1 0.01 -40 -15 ...

Page 6

Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN (Circuit of Figure 5V 0.1µ OVERLOAD RESPONSE INTO 2.5Ω 10ms/div 5V/div OUT B: V ...

Page 7

Single USB Switch with Autoreset and (Circuit of Figure 5V 0.1µ SWITCH TURN-ON TIME ( 1µF OUT R = 10Ω OUT A B 1ms/div 2V/div ON ...

Page 8

Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN (Circuit of Figure 5V 0.1µ STARTUP WAVEFORMS C = 100µF OUT C = 100µF OUT 10Ω OUT B ...

Page 9

Single USB Switch with Autoreset and ON SEL IN Figure 1. Functional Diagram An internal micropower charge pump generates a high- side supply that drives the gate of an internal 75mΩ NMOS switch. On/Off Control and Undervoltage SEL sets the ...

Page 10

Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN The MAX1946 provides an open-drain fault output, FAULT. Connect FAULT to IN through a 100kΩ pullup resistor for most applications. FAULT asserts low when any of the following conditions ...

Page 11

Single USB Switch with Autoreset and INPUT 2. 0.1µF OFF ON MAX1946 ON SEL GND *USB APPLICATIONS MAY REQUIRE ADDITIONAL BULK CAPACITANCE Figure 2. Typical Application Circuit Bypass OUT to GND with a 1µF ceramic capacitor ...

Page 12

Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN Chip Information PROCESS: BiCMOS 12 ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2010 Maxim Integrated Products ...

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