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MAX1823AEUBMAXIMN/a3314avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823AEUBMAXN/a1235avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823AEUBMAXIM ?N/a1232avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823BEUBMAXIMN/a4037avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823BEUBMAXIM ?N/a1108avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823BEUBMAXN/a4147avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823EUBMAXIMN/a47avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823EUBMAXIM ?N/a775avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823EUBMAXN/a18avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset
MAX1823HEUBMAXIMN/a6388avai4 V to 5.5 V, dual USB switch with fault blanking and autoreset


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MAX1823AEUB-MAX1823BEUB-MAX1823EUB-MAX1823HEUB
4 V to 5.5 V, dual USB switch with fault blanking and autoreset
General Description
The MAX1823 is a dual, current-limited switch with
autoreset specifically made for USB applications. The
autoreset feature latches the switch off if the output is
shorted, saving system power. The switch reactivates
when the short circuit is removed. Each channel is guar-
anteed to supply 720mA and meet USB specifications.
Low quiescent supply current (50µA) and standby current
(3µA) conserve battery power in portable applications.
The MAX1823 has multiple safety features to ensure
that the USB port is protected. Built-in thermal-overload
protection limits power dissipation and junction temper-
ature. Accurate internal current-limiting circuitry pro-
tects the input supply against both overload and
short-circuit conditions. Independent fault signals
(FAULTAand FAULTB) notify the microprocessor (µP)
when a thermal-overload, current-limit, undervoltage-
lockout (UVLO), or short-circuit fault occurs. A 20ms
fault-blanking feature ignores momentary faults, such
as those caused when hot swapping a capacitive load,
preventing false alarms to the host system. The
MAX1823A/MAX1823B also block reverse current (cur-
rent from OUT_ to IN_) while in shutdown.
The MAX1823 is available in a space-saving 10-pin
µMAX package. The MAX1823/MAX1823A are enabled
with an active-low signal, and the MAX1823B/MAX1823H
are enabled with an active-high signal. For a single ver-
sion of this device, refer to the MAX1946 data sheet. For
a triple version, refer to the MAX1940 data sheet.
Applications

USB Ports and Hubs
Notebook and Desktop Computers
PDAs and Palmtop Computers
Docking Stations
Features
Dual USB Switch in Tiny 10-Pin µMAX PackageAutoreset Feature Saves PowerGuaranteed 720mA Load per ChannelBuilt-In 20ms Fault BlankingCompliant to USB SpecificationBlocks Reverse Current in Shutdown
(MAX1823A/MAX1823B)
4V to 5.5V Input Voltage RangeIndependent Shutdown Control
(MAX1823/MAX1823A—Active Low)
(MAX1823B/MAX1823H—Active High)
Independent FAULTIndicator OutputsThermal-Overload Protection50µA Quiescent Current (Both Switches On)3µA Standby CurrentUL Recognized
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset
Ordering Information
Typical Operating Circuit

19-1903; Rev 3; 10/03
Pin Configuration
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset
ABSOLUTE MAXIMUM RATINGS

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, ONA, ONB
OUTA, OUTB to GND...........................................-0.3V to +6VFAULTA, FAULTBto GND..........................-0.3V to (VIN_+ 0.3V)
MAX1823/MAX1823H, INA, IN to OUTA;
INB, IN to OUTB...................................................-0.3V to +6V
MAX1823A/MAX1823B, INA, IN to OUTA;
INB, IN to OUTB (when disabled, Note 3)...............-6V to +6V
INA, IN to OUTA; INB, IN to OUTB
(when enabled, Note 4)..............................-1.5A to +1.5ARMS
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
ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VIN= VINA= VINB= 5V, ONA= ONB= GND (MAX1823/MAX1823A), ONA = ONB = IN (MAX1823B/MAX1823H),
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA
= +25°C.)
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset
ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= VINA= VINB= 5V, ONA= ONB= GND (MAX1823/MAX1823A), ONA = ONB = IN (MAX1823B/MAX1823H),
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA
= +25°C.)
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset
ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VIN= VIN_ = VON_ = 5V (MAX1823B/MAX1823H); VIN= VIN_ = 5V, ON_ = GND (MAX1823/MAX1823A), TA = -40°C
to +85°C, unless otherwise noted.) (Note 2)
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset
ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= VIN_ = VON_ = 5V (MAX1823B/MAX1823H); VIN= VIN_ = 5V, ON_ = GND (MAX1823/MAX1823A), TA = -40°C
to +85°C, unless otherwise noted.) (Note 2)
Note 2:
Specifications to -40°C are guaranteed by design, not production tested.
Note 3:
Reverse current (current from OUT_ to IN_) is blocked when disabled.
Note 4:
Forward current (current from IN_ to OUT_) is internally limited. Reverse current, from OUT_ to IN_, is not limited when the
device is enabled and must be kept below 1.5ARMSto prevent permanent device damage. When the MAX1823A/MAX1823B
are disabled, the switch turns off and reverse current is internally blocked.
Typical Operating Characteristics

(Circuit of Figure 1, VIN= VINA= VINB= 5V, ON_=GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), TA= +25°C,
unless otherwise noted.)
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset

MAX1823 toc06
TEMPERATURE (°C)
CONTINUOUS CURRENT LIMIT (mA)
CONTINUOUS CURRENT-LIMIT
THRESHOLD vs. TEMPERATURE

SWITCH OFF-LEAKAGE
vs. TEMPERATURE
MAX1823 toc04
TEMPERATURE (°C)
SWITCH OFF-LEAKAGE (nA)
NORMALIZED RON vs. TEMPERATURE
MAX 1823 toc05
TEMPERATURE (°C)
NORMALIZED R
TURN-ON TIME
vs. TEMPERATURE (tON + tRISE)
MAX1823 toc07
TEMPERATURE (°C)
TURN-ON TIME (ms)
TURN-OFF TIME
vs. TEMPERATURE (tOFF + tFALL)
MAX1823 toc08
TEMPERATURE (°C)
TURN-OFF TIME (ms)
FAULT-BLANKING TIME
vs. TEMPERATURE
MAX1823 toc09
TEMPERATURE (°C)
FAULT-BLANKING TIME (ms)
FAULT_ OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX1823 toc10
TEMPERATURE (°C)
FAULT_ OUTPUT LOW VOLTAGE (V)
AUTORESET CURRENT vs. TEMPERATURE
(MAX1823/MAX1823H)
MAX1823 toc11
TEMPERATURE (°C)
AUTORESET CURRENT (mA)
AUTORESET CURRENT vs. TEMPERATURE
(MAX1823A/MAX1823B)
MAX1823 toc12
TEMPERATURE (°C)
AUTORESET CURRENT (mA)
Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= VINA= VINB= 5V, ON_=GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), TA= +25°C,
unless otherwise noted.)
MAX1823/MAX1823A/MAX1823B/MAX1823H
Dual USB Switch with Fault
Blanking and Autoreset

MAX1823 toc13
INPUT VOLTAGE (V)
AUTORESET CURRENT (mA)
AUTORESET CURRENT vs. INPUT VOLTAGE
(MAX1823/MAX1823H)
MAX1823 toc14
INPUT VOLTAGE (V)
AUTORESET CURRENT (mA)
AUTORESET CURRENT vs. INPUT VOLTAGE
(MAX1823A/MAX1823B)
10ms/div
OVERLOAD RESPONSE INTO 2.5Ω
(MAX1823/MAX1823H)

A: VIN_, 5V/div
B: VOUTA, 5V/div
C: VFAULTA, 5V/div
D: IOUTA, 1A/div
MAX1823 toc15
10ms/div
OVERLOAD RESPONSE INTO 2.5Ω
(MAX1823A/MAX1823B ONLY)

A: VIN_, 5V/div
B: VOUTA, 5V/div
C: VFAULTA, 5V/div
D: IOUTA, 1A/div
MAX1823 toc16
500µs/div
OVERLOAD RESPONSE INTO 2.5Ω
(EXPANDED TIME SCALE)

A: VIN_, 5V/div
B: VOUTA, 5V/div
MAX1823 toc17
C: VFAULTA, 5V/div
D: IOUTA, 1A/div
10ms/div
SHORT-CIRCUIT RESPONSE INTO 0Ω
(MAX1823/MAX1823H)

MAX1823 toc18
C: VFAULTA, 5V/div
D: IOUTA, 1A/div
A: VIN_, 5V/div
B: VOUTA, 5V/div
10ms/div
SHORT-CIRCUIT RESPONSE INTO 0Ω
(MAX1823A/MAX1823B)

MAX1823 toc19
C: VFAULTA, 5V/div
D: IOUTA, 2A/div
A: VIN_, 5V/div
500µs/div
SHORT-CIRCUIT RESPONSE INTO 0Ω
(EXPANDED TIME SCALE)

A: VIN_, 5V/div
B: VOUTA, 5V/div
MAX1823 toc20
C: VFAULTA, 5V/div
D: IOUTA, 2A/div
1ms/div
SWITCH TURN-ON TIME
(MAX1823/MAX1823A)

A: VONA, 5V/div
B: VOUTA, 2V/div
MAX1823 toc21
Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= VINA= VINB= 5V, ON_=GND (MAX1823/MAX1823A), ON_ = IN_ (MAX1823B/MAX1823H), TA= +25°C,
unless otherwise noted.)
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