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19-1903; Rev 3; 10/03
www.DataSheet4U.com
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
(FAULTA and 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
Pin Configuration
TOP VIEW
*(ONA) ONA 1
INA 2
IN 3
INB 4
*(ONB) ONB 5
MAX1823
MAX1823A
MAX1823B
MAX1823H
10 FAULTA
9 OUTA
8 GND
7 OUTB
6 FAULTB
µMAX
*( ) ARE FOR MAX1823B/MAX1823H.
Features
o Dual USB Switch in Tiny 10-Pin µMAX Package
o Autoreset Feature Saves Power
o Guaranteed 720mA Load per Channel
o Built-In 20ms Fault Blanking
o Compliant to USB Specification
o Blocks Reverse Current in Shutdown
(MAX1823A/MAX1823B)
o 4V to 5.5V Input Voltage Range
o Independent Shutdown Control
(MAX1823/MAX1823A—Active Low)
(MAX1823B/MAX1823H—Active High)
o Independent FAULT Indicator Outputs
o Thermal-Overload Protection
o 50µA Quiescent Current (Both Switches On)
o 3µA Standby Current
o UL Recognized
PART
MAX1823EUB
MAX1823AEUB
MAX1823BEUB
MAX1823HEUB
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Typical Operating Circuit
INPUT
4V TO 5.5V
ONA
ONB
INA OUTA
IN
INB
MAX1823
MAX1823A
FAULTA
OUTB
FAULTB
ONA
ONB
GND
USB
PORT A
USB
PORT B
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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Dual USBwww.DataSheet4U.com Switch with Fault
Blanking and Autoreset
ABSOLUTE MAXIMUM RATINGS
IN, INA, INB, ONA, ONB, ONA, ONB
OUTA, OUTB to GND ...........................................-0.3V to +6V
FAULTA, FAULTB to 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, 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
(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.)
PARAMETER
Supply Voltage Range
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
4.0 5.5 V
TA = +25°C, each switch,
MAX1823/MAX1823H
75 105
Switch On-Resistance
RON
TA = +25°C, each switch,
MAX1823A/MAX1823B
TA = 0°C to +85°C, each switch,
MAX1823/MAX1823H
90 120
m
135
TA = 0°C to +85°C, each switch,
MAX1823A/MAX1823B
165
Standby Supply Current
ON_ = IN_ (MAX1823/MAX1823A), ON_ =
GND (MAX1823B/MAX1823H)
3 10 µA
Quiescent Supply Current
IOUTA = IOUTB = 0A, one channel on
OUT_ Off-Leakage Current
Undervoltage-Lockout Threshold
Continuous Load Current
Continuous Current Limit
Short-Circuit Current Limit
VUVLO
IOUTA = IOUTB = 0A, both channels on
ON_ = IN_ (MAX1823/MAX1823A), ON_ = GND
(MAX1823B/MAX1823H), VOUTA = VOUTB = 0V,
TA = +25oC
ON_ = IN_ (MAX1823/MAX1823A), ON_ =
GND (MAX1823B/MAX1823H),
VOUTA = VOUTB = 0V, TA = 0oC to +85oC
Rising edge, 3% hysteresis
ILIM
ISHORT
VIN - VOUT_ = 0.5V
VOUT_ = 0V (IOUT pulsing)
VOUT_ = 0V (IOUT pulsing)
3.0
720
0.72
0.8
40 80
50 100
µA
0.02 1.00
0.02 10.00
µA
3.4
0.90
1.2
0.35
3.8
1.20
1.6
V
mA
A
APEAK
ARMS
2 _______________________________________________________________________________________

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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.)
PARAMETER
Short-Circuit Detect Threshold
SYMBOL
(Note 1)
CONDITIONS
MIN TYP MAX UNITS
1V
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT_ assertion
10 20 35 ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT_ assertion
7.5 18 35.0 ms
Turn-On Delay
ROUT_ = 10k,
MAX1823/MAX1823H
0.5 1.2 4.0
tON does not include
rise time
MAX1823A/MAX1823B
0.3
0.8
3.0
ms
Output Rise Time
tRISE ROUT_ = 10, from 10% to 90% of VOUT_
2.5 ms
Turn-Off Delay from ON
ROUT_ = 10, does not include fall time (from
ON_ (MAX1823) or ON_ (MAX1823H)
deasserted to VOUT = 90% of VIN_)
tOFF
ROUT_ = 10, does not include fall time (from
ON_ (MAX1823A) or ON_ (MAX1823B)
deasserted to VOUT = 90% of VIN_)
0.8 3.0
0.1 3.0
ms
Output Fall Time
Thermal-Shutdown Threshold
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
FAULT_ Output Low Voltage
FAULT_ Output High Leakage
Current
Autoreset OUT_ Current
Autoreset Threshold
Autoreset Blanking Time
tFALL
ROUT_ = 10, from 90% to 10% of VOUT_
(MAX1823/MAX1823H)
ROUT_ = 10, from 90% to 10% of VOUT_
(MAX1823A/MAX1823B)
15oC hysteresis
VIN_ = 4V to 5.5V
VIN_ = 4V to 5.5V
ON_ = GND or IN_ (MAX1823/MAX1823A),
ON_ = GND or IN_ (MAX1823B/MAX1823H)
ISINK = 1mA, VIN_ = 4V
VIN_ = V FAULT_ = 5.5V
In latched-off state, VOUT_ = 0V
In latched-off state, rising
In latched-off state, VOUT_ > 0.5V
2.5
2.8
+160
2
0.8
-1 +1
0.4
1
10 30 45
0.4 0.5 0.6
10 20 35
ms
oC
V
V
µA
V
µA
mA
V
ms
_______________________________________________________________________________________ 3

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Dual USB Switchw w w . D a t a S h e e t 4 U . c o m 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)
PARAMETER
Supply Voltage Range
Switch On-Resistance
Standby Supply Current
SYMBOL
CONDITIONS
Each switch, MAX1823/MAX1823H
RON
Each switch, MAX1823A/MAX1823B
ON_ = IN_ (MAX1823/MAX1823A),
ON_ = GND (MAX1823B/MAX1823H)
MIN TYP MAX UNITS
4.0 5.5 V
135
m
165
10 µA
Quiescent Supply Current
IOUTA = IOUTB = 0A, one channel on
IOUTA = IOUTB = 0A, both channels on
80
µA
100
OUT_ Off-Leakage Current
Undervoltage-Lockout Threshold
Continuous Load Current
Continuous Current Limit
Current Limit into Short Circuit
Continuous Current-Limit
Blanking Timeout Period
Short-Circuit Blanking Timeout
Period
Turn-On Delay
Turn-Off Delay from ON
VUVLO
ON_ = IN_ (MAX1823/MAX1823A),
ON_ = GND (MAX1823B/MAX1823H),
VOUTA = VOUTB = 0V
Rising edge, 3% hysteresis
ILIM
ISHORT
tON
tOFF
VIN_ - VOUT_ = 0.5V
VOUT_ = 0V (IOUT pulsing)
From continuous current-limit condition to
FAULT_ assertion
From short-circuit current-limit condition to
FAULT_ assertion
ROUT_ = 10k,
does not include
rise time
MAX1823/MAX1823H
MAX1823A/MAX1823B
ROUT_ = 10, does not include fall time
(from ON_ (MAX1823/MAX1823A) or ON_
(MAX1823B/MAX1823H) deasserted to
VOUT_ = 90% VIN_)
3.0
720
0.72
0.8
10
7.5
0.5
0.3
10 µA
3.8
1.20
1.6
35
V
mA
A
APEAK
ms
35.0
4.0
3.0
ms
ms
3 ms
4 _______________________________________________________________________________________

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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)
PARAMETER
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
FAULT_ Output Low Voltage
FAULT_ Output High Leakage
Current
SYMBOL
CONDITIONS
VIN_= 4V to 5.5V
VIN_= 4V to 5.5V
V ON_ = 0V or VIN_
ISINK = 1mA, VIN_ = 4V
VIN_ = V FAULT_ = 5.5V
MIN TYP MAX UNITS
2V
0.8 V
-1 +1 µA
0.4 V
1 µA
Autoreset OUT_Current
Autoreset Threshold
Autoreset Blanking Time
In latched-off state, VOUT_ = 0V
In latched-off state, rising
In latched-off state, VOUT_ > 0.5V
10
0.4
10
50 mA
0.6 V
35 ms
Note 1: The output voltage at which the device transitions from short-circuit current limit to continuous current limit.
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 1.5ARMS to 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.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE
60
54
48
42
36
30
24
18
12
6
0
0123456
INPUT VOLTAGE (V)
QUIESCENT CURRENT
vs. TEMPERATURE
55
VIN_ = 5.5V
53
51 VIN_ = 5V
49
VIN_ = 4.5V
47
45
-40
-15 10 35 60
TEMPERATURE (°C)
85
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
3.5
ON_ = IN_ (MAX1823/MAX1823A)
ON_ = GND (MAX1823B/MAX1823H)
3.3
3.1
2.9
2.7
2.5
-40
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5