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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1812 Datasheet

Dual USB Switch with Fault Blanking

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MAX1812 pdf
19-1865; Rev 0; 11/00
Dual USB Switch with Fault Blanking
General Description
The MAX1812 is a dual current-limited switch specifi-
cally made for USB applications. Each channel is guar-
anteed to supply 500mA and meets USB specifications.
The MAX1812’s low quiescent supply current (45µA)
and shutdown current (3µA) conserve battery power in
portable applications.
The MAX1812 has multiple safety features to ensure
that the USB port is protected. Built-in thermal-overload
protection limits power dissipation and junction temper-
ature. The device also has accurate internal current-lim-
iting circuitry to protect the input supply against both
overload and short-circuit conditions. Independent fault
signals (FAULTA and FAULTB) notify the microproces-
sor when a thermal-overload, current limit, undervoltage
lockout, or short-circuit fault occurs. A 20ms fault-blank-
ing feature enables the circuit to ignore momentary
faults, such as those caused when hot-swapping a
capacitive load, thereby preventing false alarms to the
host system.
The MAX1812 is available in a space-saving 10-pin
µMAX package. For single versions of this device, refer
to the MAX1693, MAX1694, and MAX1607 data sheets.
________________________Applications
USB Ports
USB Hubs
Notebook Computers
Desktop Computers
PDAs and Palmtop Computers
Docking Stations
Features
o Dual USB Switch in Tiny 10-Pin µMAX Package
o Guaranteed 500mA Load per Channel
o Built-In 20ms Fault Blanking
o Compliant to USB Specifications
o +4.0V to +5.5V Input Voltage Range
o 45µA Quiescent Current
o 3µA Shutdown Current
o Independent Shutdown Control
o Independent FAULT Indicator Outputs
o Thermal-Overload Protection
o UL Listing Pending
PART
MAX1812EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
INPUT
4.0V TO 5.5V
Typical Operating Circuit
INA OUTA
IN
INB
USB
PORT A
MAX1812
FAULTA
OUTB
FAULTB
ONA ONA
ONB ONB GND
USB
PORT B
TOP VIEW
Pin Configuration
ONA 1
INA 2
IN 3
INB 4
ONB 5
MAX1812
µMAX
10 FAULTA
9 OUTA
8 GND
7 OUTB
6 FAULTB
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1812 Datasheet

Dual USB Switch with Fault Blanking

No Preview Available !

MAX1812 pdf
Dual USB Switch with Fault Blanking
ABSOLUTE MAXIMUM RATINGS
IN, INA, INB, ONA, ONB, OUTA, OUTB to GND......-0.3V to +6V
FAULTA, FAULTB to GND .........................-0.3V to (VIN_ + 0.3V)
INA, IN to OUTA; INB, IN to OUTB..........................-0.3V to +6V
OUTA, OUTB Maximum Continuous Switch Current
(per channel, internally limited) .........................................1.2A
FAULTA, FAULTB Current .................................................20mA
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
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
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VINA = VINB = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C) (Note 1)
PARAMETER
Supply Voltage Range
Switch On-Resistance
Standby Supply Current
Quiescent Supply Current
OUT_ Leakage Current
Undervoltage Lockout Threshold
Continuous Load Current
Continuous Current Limit
Short-Circuit Current Limit
Short-Circuit Detect Threshold
SYMBOL
CONDITIONS
RON
UVLO
TA = +25°C, each switch
TA = -40°C to +85°C, each switch
Both switches disabled
Both switches enabled, IOUTA = IOUTB = 0
Switches disabled, VOUTA = VOUTB = 0,
TA = +25°C
Switches disabled, VOUTA = VOUTB = 0,
TA = -40°C to 85°C
Rising edge, 3% hysteresis
ILIM
VIN_ - VOUT_ = 0.5V
ISHORT VOUT_ = 0 (IOUT pulsing)
(Note 2)
MIN TYP MAX
4.0 5.5
75 105
135
3 10
45 100
0.002
1
10
3.0 3.4 3.8
500
0.6 0.9 1.2
0.8 1.2 1.6
0.35
1
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT_ assertion
10 20 35
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT_ assertion
7.5 18
35
Turn-On Delay
Output Rise Time
Turn-Off Delay from ON
Output Fall Time
Thermal Shutdown Threshold
ROUT = 10, COUT = 1µF does not include
rise time (from ON_ to 10% of VOUT)
0.5
1.2
4.0
ROUT = 10, COUT = 1µF, from 10% to
90% of VOUT
2.5
ROUT = 10, COUT = 1µF does not include
fall time (from ON_ to 90% of VOUT)
0.8 3
COUT = 1µF, ROUT = 10, from 90% to 10%
of VOUT
2.5
15°C hysteresis
160
UNITS
V
m
µA
µA
µA
V
mA
A
A(peak)
ARMS
V
ms
ms
ms
ms
ms
ms
°C
2 _______________________________________________________________________________________


Part Number MAX1812
Description Dual USB Switch with Fault Blanking
Maker Maxim
Total Page 10 Pages
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