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MAX1812EUB+ |MAX1812EUBMAXIMN/a70avaiDual USB Switch with Fault Blanking
MAX1812EUB+N/AN/a2500avaiDual USB Switch with Fault Blanking
MAX1812EUB+T |MAX1812EUBTMAXIMN/a7500avaiDual USB Switch with Fault Blanking


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MAX1812EUB+-MAX1812EUB+T
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 (FAULTAand 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
Dual USB Switch in Tiny 10-Pin µMAX PackageGuaranteed 500mA Load per ChannelBuilt-In 20ms Fault BlankingCompliant to USB Specifications+4.0V to +5.5V Input Voltage Range45µA Quiescent Current3µA Shutdown CurrentIndependent Shutdown ControlIndependent FAULTIndicator OutputsThermal-Overload ProtectionUL Listing Pending
MAX1812
Dual USB Switch with Fault Blanking
Pin Configuration

ONBONB
ONAONA
GND
MAX1812
FAULTB
FAULTA
INA
INB
USB
PORT AOUTA
USB
PORT BOUTB
INPUT
4.0V TO 5.5Vypical Operating Circuit
19-1865; Rev 0; 11/00
OUTA
GND
OUTBINB
INA
MAX1812
μMAX
TOP VIEW
ONA
ONBFAULTB
FAULTA
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX1812EUB-40°C to +85°C10 μMAX
MAX1812
Dual USB Switch with Fault Blanking
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= VINA= VINB= 5V, TA= -40°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C) (Note 1)
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.
IN, INA, INB, ONA, ONB, OUTA, OUTB to GND......-0.3V to +6V
FAULTA, FAULTBto 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, FAULTBCurrent .................................................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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply Voltage Range4.05.5V
TA = +25°C, each switch75105Switch On-ResistanceRONTA = -40°C to +85°C, each switch135mΩ
Standby Supply CurrentBoth switches disabled310μA
Quiescent Supply CurrentBoth switches enabled, IOUTA = IOUTB = 045100μA
Switches disabled, VOUTA = VOUTB = 0,
TA = +25°C0.0021
OUT_ Leakage Current
Switches disabled, VOUTA = VOUTB = 0,
TA = -40°C to 85°C10nd er vol tag e Lockout Thr eshol d UVLORising edge, 3% hysteresis3.03.43.8V
Continuous Load Current500mA
Continuous Current LimitILIMVIN_ - VOUT_ = 0.5V0.60.91.2A
0.81.21.6A( peak)Short-Circuit Current LimitISHORTVOUT_ = 0 (IOUT pulsing)0.35ARMS
Short-Circuit Detect Threshold(Note 2)1V
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT_ assertion102035ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT_ assertion7.51835ms
Turn-On DelayROUT = 10Ω, COUT = 1μF does not include
rise time (from ON_ to 10% of VOUT)0.51.24.0ms
Output Rise TimeROUT = 10Ω, COUT = 1μF, from 10% to
90% of VOUT2.5ms
Turn-Off Delay from ONROUT = 10Ω, COUT = 1μF does not include
fall time (from ON_ to 90% of VOUT)0.83ms
Output Fall TimeCOUT = 1μF, ROUT = 10Ω, from 90% to 10%
of VOUT2.5ms
Thermal Shutdown Threshold15°C hysteresis160°C
MAX1812
Dual USB Switch with Fault Blanking
ELECTRICAL CHARACTERISTICS (continued)

(VIN= VINA= VINB= 5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Logic Input High VoltageVIN_ = +4V to +5.5V2V
Logic Input Low VoltageVIN_ = +4V to +5.5V0.8V
Logic Input CurrentV ON_ = 0 or VIN_-11μA
FAULT_ Output Low VoltageISINK = 1mA, VIN_ = 4V0.4V
FAULT_ Output High Leakage
CurrentVIN_ = V FAULT_ = 5.5V1μA
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
Note 2:
The output voltage at which the device transitions from short-circuit current limit to continuous current limit.
Typical Operating Characteristics

(VIN= VINA= VINB= 5V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX1812 toc01
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
VONA = VONB = 0V
QUIESCENT CURRENT
vs. TEMPERATURE
MAX1812 toc02
TEMPERATURE (°C)
QUIESCENT CURRENT (
VIN = 4.5V
VIN = 5V
VIN = 5.5V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1812 toc03
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (VONA = VONB = VIN
MAX1812
Dual USB Switch with Fault Blanking
Typical Operating Characteristics

(VIN= VINA= VINB= 5V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
NORMALIZED RON vs. TEMPERATURE
MAX 1812 toc05
TEMPERATURE (°C)
NORMALIZED R
VONA = VONB = 0V
CONTINUOUS CURRENT LIMIT
vs. TEMPERATURE
MAX1812 toc06
TEMPERATURE (°C)
CONTINUOUS CURRENT LIMIT (mA)
VIN = 5V
TOTAL TURN-OFF TIME
vs. TEMPERATURE
MAX1812 toc08
TEMPERATURE (°C)
TOTAL TURN-OFF TIME (ms)
VIN = 5.5V
VIN = 5V
VIN = 4.5V
TOTAL TURN-OFF
TIME = FALL TIME + DELAY TIME
FAULT-BLANKING TIME
vs. TEMPERATURE
MAX1812 toc09
TEMPERATURE (°C)
FAULT-BLANKING TIME (ms)
VIN = 5.0V
OUT_ LEAKAGE CURRENT
vs. TEMPERATURE
MAX1812 toc04
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)85
VONA = VONB = VIN
TOTAL TURN-ON TIME
vs. TEMPERATURE
MAX1812 toc07
TEMPERATURE (°C)
TOTAL TURN-ON TIME (ms)
VIN = 4.5V
VIN = 5V
VIN = 5.5V
TOTAL TURN-ON
TIME = RISE TIME + DELAY TIME
FAULT OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX1812 toc10
TEMPERATURE (°C)
FAULT OUTPUT LOW VOLTAGE (V)
VIN = 4.5V
VIN = 5V
VIN = 5.5V
5ms/div
MAX1812-11
A : VIN, 5V/div C : VFAULTA, 5V/div
B : VOUTA, 5V/div D : IOUTA, 1A/div
OVERLOAD RESPONSE INTO 2.5Ω LOAD

LOAD REMOVED
FAULT RECOVERS
500μs/div
A : VIN, 5V/div C : VFAULTA, 5V/div
B : VOUTA, 5V/div D : IOUTA, 1A/div
MAX1812-12
OVERLOAD RESPONSE INTO 2.5Ω LOAD
(EXPANDED TIME SCALE)
MAX1812
Dual USB Switch with Fault Blanking
Typical Operating Characteristics (continued)

(VIN= VINA= VINB= 5V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
400μs/div
MAX1812-14
A : VIN, 1V/div C : VFAULTA, 5V/div
B : VOUTA, 5V/div D : IOUTA, 1A/div
SHORT-CIRCUIT RESPONSE INTO 0Ω LOAD
(EXPANDED TIME SCALE)

1ms/div
MAX1812-15
A : VONA, 5V/div
B : VOUTA, 1V/div
SWITCH TURN-ON TIME

RL = 10Ω
COUT = 1μF
1ms/div
MAX1812-16
A : VONA, 5V/div
B : VOUTA, 1V/div
SWITCH TURN-OFF TIME

RL = 10Ω
COUT = 1μF
500μs/div
A : VONA, 5V/div C : VOUTA, 2V/div
B : VFAULTA, 5V/div D : IOUTA, 0.5A/div0
MAX1812-17
STARTUP TIME
(TYPICAL USB APPLICATION)

RL = 10Ω
COUT = 150μF
10ms/div
A : VIN, 1V C : VFAULTA, 5V/div
B : VOUTA, 5V/div D : IOUTA, 1A/div
MAX1812-13 SHORT-CIRCUIT RESPONSE INTO 0Ω
FAULT RECOVERS
LOAD REMOVED
MAX1812
Detailed Description

The MAX1812 is a dual current-limited switch designed
specifically for USB applications. It has two indepen-
dent switches, each with its own enable control input.
Each switch also has an independent error flag output
to notify the USB controller when the current-limit, short-
circuit, undervoltage-lockout, or thermal-shutdown
threshold is reached (Figure 1).
The MAX1812 operates from a +4V to +5.5V input volt-
age and guarantees a minimum output current of
500mA. A built-in current-limit of 0.9A (typ) limits the
current in the event of a heavy overload condition. The
MAX1812 has independent thermal shutdown for each
switch in the event of a prolonged overload or short-cir-
cuit condition.
Use of internal low RONNMOS switches enables the
MAX1812 to fit two switches in the ultra-small 10-pin
µMAX package. An internal micropower charge pump
generates the high-side supply needed for driving the
gates of these high-side switches. Separate current-
limiting and thermal-shutdown circuits permit each
switch to operate independently, improving system
robustness.
Undervoltage Lockout and
Input Voltage Requirements

The MAX1812 includes an undervoltage-lockout
(UVLO) circuit to prevent erroneous switch operation
when the input voltage goes low during startups and
brownout conditions. Operation is inhibited when VIN_
< 3.4V.
Output Fault Protection

The MAX1812 senses the switch output voltage and
selects continuous current limiting when VOUT_ > 1V, or
pulsed current limiting when VOUT_< 1V. When VOUT_
> 1V, the device operates in a continuous current-limit
mode, which sets the output current limit to 0.9A (typ).
When VOUT_< 1V, the device operates in short-circuit
current-limit mode. The MAX1812 pulses the output
current at 400Hz to limit the output current to 0.35A
(RMS).
Thermal Shutdown

The MAX1812 features independent thermal shutdown
for each switch channel, allowing one switch to deliver
power even if the other switch has a fault condition.
When the junction temperature exceeds +160°C, the
switch turns off and the FAULT_output goes low imme-
diately; fault blanking does not occur during thermal
limit. When the junction cools by 15°C, the switch turns
back on again. If the fault overload condition continues,
the switch will cycle on and off, resulting in a pulsed
output that saves battery power.
Fault Indicators

The MAX1812 provides an open-drain fault output
(FAULT_)for each switch. For most applications, con-
nect FAULT_to IN_ through a 100kΩpullup resistor.
Dual USB Switch with Fault Blanking
PINNAMEFUNCTION
ONAControl Input for Switch A. Can be driven higher than IN_ without damage. A logic low turns switch A
on.
2, 3, 4INA, IN,
INB
Power Input. Connect all IN_ pins together and bypass with a 0.1μF capacitor to ground. Load
conditions may require additional bulk capacitance to prevent the input from being pulled down.ONBControl Input for Switch B. Can be higher than IN_ without damage. A logic low turns switch B on.FAULTBFault Indicator Output for Switch B. This open-drain output goes low when switch B is in thermal
shutdown or undervoltage lockout or in a sustained (>20ms) current-limit or short-circuit condition.OUTBPower Output for Switch B. Connect a 1μF capacitor from OUTB to ground. Load condition may
require additional bulk capacitance. See USB requirements.GNDGroundOUTAPower Output for Switch A. Connect a 1μF capacitor from OUTA to ground. Load condition may
require additional bulk capacitance. See USB requirements.FAULTAFault Indicator Output for Switch A. This open-drain output goes low when switch A is in thermal
shutdown or undervoltage lockout or in a sustained (>20ms) current-limit or short-circuit condition.
Pin Description
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