MAXIM MAX1823, MAX1823A, MAX1823B, MAX1823H Technical data

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 guar­anteed 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 temper­ature. Accurate internal current-limiting circuitry pro­tects 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, undervoltage­lockout (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 (cur­rent 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 ver­sion 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 Package

♦ Autoreset Feature Saves Power

♦ Guaranteed 720mA Load per Channel

♦ Built-In 20ms Fault Blanking

♦ Compliant to USB Specification

♦ Blocks Reverse Current in Shutdown

(MAX1823A/MAX1823B)

♦ 4V to 5.5V Input Voltage Range

♦ Independent Shutdown Control

(MAX1823/MAX1823A—Active Low)
(MAX1823B/MAX1823H—Active High)

♦ Independent FAULT Indicator Outputs

♦ Thermal-Overload Protection

♦ 50µA Quiescent Current (Both Switches On)

♦ 3µA Standby Current

♦ UL Recognized

MAX1823/MAX1823A/MAX1823B/MAX1823H

Dual USB Switch with Fault

Blanking and Autoreset

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

Typical Operating Circuit

19-1903; Rev 3; 10/03

Pin Configuration

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.

TOP VIEW

INA

1

2

MAX1823

3

IN

4

5

MAX1823A
MAX1823B
MAX1823H

µMAX

10

9

8

7

6

FAULTA

OUTA

GND

OUTBINB

FAULTB

*(ONA) ONA

*(ONB) ONB

*( ) ARE FOR MAX1823B/MAX1823H.

PART TEMP RANGE PIN-PACKAGE

MAX1823EUB -40°C to +85°C 10 µMAX

MAX1823AEUB -40°C to +85°C 10 µMAX

MAX1823BEUB -40°C to +85°C 10 µMAX

MAX1823HEUB -40°C to +85°C 10 µMAX

USB
PORT A

USB
PORT B

INPUT

4V TO 5.5V

INA

IN

INB

MAX1823A

FAULTA

FAULTB

ONAONA

ONBONB

OUTA

MAX1823

OUTB

GND

MAX1823/MAX1823A/MAX1823B/MAX1823H

Dual USB Switch with Fault
Blanking and Autoreset

2 _______________________________________________________________________________________

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 +6V

FAULTA, FAULTB to GND..........................-0.3V to (V

IN_

+ 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 +1.5A

RMS

FAULTA, FAULTB Current .................................................20mA

Continuous Power Dissipation (T

A

= +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= V

INA

= V

INB

= 5V, ONA = ONB = GND (MAX1823/MAX1823A), ONA = ONB = IN (MAX1823B/MAX1823H),

T

A

= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

Supply Voltage Range 4.0 5.5 V

Switch On-Resistance R

Standby Supply Current

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TA = +25°C, each switch,
MAX1823/MAX1823H

TA = +25°C, each switch,
MAX1823A/MAX1823B

ON

TA = 0°C to +85°C, each switch,
MAX1823/MAX1823H

TA = 0°C to +85°C, each switch,
MAX1823A/MAX1823B

ON_ = IN_ (MAX1823/MAX1823A), ON_ =
GND (MAX1823B/MAX1823H)

75 105

90 120

135

165

310µA

mΩ

I

= I

Quiescent Supply Current

OUT_ Off-Leakage Current

Undervoltage-Lockout Threshold V

Continuous Load Current 720 mA

Continuous Current Limit I

Short-Circuit Current Limit I

UVLO

LIM

SHORT

OUTA

= I

I

OUTA

ON_ = IN _ ( MAX 1823/M AX1823A), ON _ = GND
(M AX1823B/M AX1823H), V
T

= +25oC

A

ON_ = IN_ (MAX1823/MAX1823A), ON_ =
GND (MAX1823B/MAX1823H),
V

OUTA

Rising edge, 3% hysteresis 3.0 3.4 3.8 V

VIN - V

V

= 0V (I

OUT_

V

= 0V (I

OUT_

= 0A, one channel on 40 80

OUTB

= 0A, both channels on 50 100

OUTB

= V

OUTA

= V

OUT_

= 0V, TA = 0oC to +85oC

OUTB

= 0.5V 0.72 0.90 1.20 A

pulsing) 0.8 1.2 1.6 A

OUT

pulsing) 0.35 A

OUT

OUTB

= 0V,

0.02 1.00

0.02 10.00

µA

µA

PEAK

RMS

MAX1823/MAX1823A/MAX1823B/MAX1823H

Dual USB Switch with Fault

Blanking and Autoreset

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN= V

INA

= V

INB

= 5V, ONA = ONB = GND (MAX1823/MAX1823A), ONA = ONB = IN (MAX1823B/MAX1823H),

T

A

= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)

Short-Circuit Detect Threshold (Note 1) 1 V

Continuous Current-Limit
Blanking Timeout Period

Short-Circuit Blanking Timeout
Period

Turn-On Delay t

Output Rise Time t

Turn-Off Delay from ON t

Output Fall Time t

Thermal-Shutdown Threshold 15oC hysteresis +160

Logic Input High Voltage V

Logic Input Low Voltage V

Logic Input Current

FAULT_ Output Low Voltage I

FAULT_ Output High Leakage

Current

Autoreset OUT_ Current In latched-off state, V

Autoreset Threshold In latched-off state, rising 0.4 0.5 0.6 V

Autoreset Blanking Time In latched-off state, V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ON

RISE

OFF

FALL

From continuous current-limit condition to
FAULT_ assertion

From short-circuit current-limit condition to
FAULT_ assertion

R

= 10kΩ,

OUT_

does not include
rise time

R

= 10Ω, from 10% to 90% of V

OUT_

R

_ = 10Ω, does not include fall time (from

OUT

ON_ (MAX1823) or ON_ (MAX1823H)
deasserted to V

R

_ = 10Ω, does not include fall time (from

OUT

ON_ (MAX1823A) or ON_ (MAX1823B)
deasserted to V

R

= 10Ω, from 90% to 10% of V

OUT_

(MAX1823/MAX1823H)

R

= 10Ω, from 90% to 10% of V

OUT_

(MAX1823A/MAX1823B)

= 4V to 5.5V 2 V

IN_

= 4V to 5.5V 0.8 V

IN_

ON_ = GND or IN_ (MAX1823/MAX1823A),
ON_ = GND or IN_ (MAX1823B/MAX1823H)

= 1mA, VIN_ = 4V 0.4 V

SINK

V

_ = V

IN

FAULT_

MAX1823/MAX1823H 0.5 1.2 4.0

MAX1823A/MAX1823B 0.3 0.8 3.0

OUT_

= 90% of V

OUT

= 90% of V

OUT

= 5.5V 1 µA

OUT_

OUT_

)

IN_

)

IN_

OUT_

OUT_

= 0V 10 30 45 mA

> 0.5V 10 20 35 ms

10 20 35 ms

7.5 18 35.0 ms

2.5 ms

0.8 3.0

0.1 3.0

2.5

2.8

-1 +1 µA

ms

ms

ms

o

C

MAX1823/MAX1823A/MAX1823B/MAX1823H

Dual USB Switch with Fault
Blanking and Autoreset

4 _______________________________________________________________________________________

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)

Supply Voltage Range 4.0 5.5 V

Switch On-Resistance R

Standby Supply Current

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ON

Each switch, MAX1823/MAX1823H 135
Each switch, MAX1823A/MAX1823B 165

ON_ = IN_ (MAX1823/MAX1823A),
ON_ = GND (MAX1823B/MAX1823H)

I

OUTA

= I

= 0A, one channel on 80

OUTB

10 µA

mΩ

Quiescent Supply Current

= I

I

OUTA

ON_ = IN_ (MAX1823/MAX1823A),

OUT_ Off-Leakage Current

Undervoltage-Lockout Threshold V

Continuous Load Current 720 mA

Continuous Current Limit I

Current Limit into Short Circuit I

Continuous Current-Limit
Blanking Timeout Period

Short-Circuit Blanking Timeout
Period

Turn-On Delay t

Turn-Off Delay from ON t

UVLO

LIM

SHORTVOUT_

ON

OFF

ON_ = GND (MAX1823B/MAX1823H),
V

OUTA

Rising edge, 3% hysteresis 3.0 3.8 V

V

- V

IN_

= 0V (I

From continuous current-limit condition to
FAULT_ assertion

From short-circuit current-limit condition to
FAULT_ assertion

R

= 10kΩ,

OUT_

does not include
rise time

R

OUT_

(from ON_ (MAX1823/MAX1823A) or ON_
(MAX1823B/MAX1823H) deasserted to
V

= 90% V

OUT_

= 0A, both channels on 100

OUTB

= V

OUT_

= 10Ω, does not include fall time

= 0V

OUTB

= 0.5V 0.72 1.20 A

pulsing) 0.8 1.6 A

OUT

10 35 ms

7.5 35.0 ms

MAX1823/MAX1823H 0.5 4.0

MAX1823A/MAX1823B 0.3 3.0

)

IN_

10 µA

3ms

µA

PEAK

ms