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MAX1922ESA+C71073

P1-P3P4-P6P7-P9
MAX1922
1A Current-Limited Switch for 2 USB Ports
________________________________________________________________
Maxim Integrated Products
1
OUT
1
2
8
7
OUT
OUTIN
IN
GND
SO
TOP VIEW
3
4
6
5
MAX1922
OC
EN
MAX1922
IN OUTPUTOUT
INPUT
2.7V TO 5.5V
ON
OFF
GND
OC
EN
Typical Operating Circuit
19-2254; Rev 3; 4/09
Pin Configurations
Ordering Information
General Description
The MAX1922 current-limited 70mΩ switch with built-in
fault blanking provides an accurate, preset 1.4A to 2.1A
current limit, making it ideal for dual USB applications.
Its low quiescent supply current (16µA) and standby
current (1µA) conserve battery power in portable appli-
cations. The MAX1922 operates with inputs from 2.7V
to 5.5V, making it ideal for both 3V and 5V systems.
An overcurrent signal (OC) notifies the microprocessor
that the internal current limit has been reached. A 10ms
overcurrent-blanking feature allows momentary faults
(such as those caused when hot-swapping into a
capacitive load) to be ignored, thus preventing false
alarms to the host system. This blanking also prevents
an OC signal from being issued when the device is
powering up.
The MAX1922 has several safety features to ensure that
the USB port is protected. Built-in thermal-overload pro-
tection limits power dissipation and junction tempera-
ture. The device also has accurate internal current-
limiting circuitry to protect the input supply against
overload.
The MAX1922 is offered in a space-saving 8-pin SO
package and a 10-pin TDFN package and operates over
the extended (-40°C to +85°C) temperature range.
Applications
Notebook Computers
USB Ports
USB Hubs
Docking Stations
Features
o Accurate Current Limit (1.4A min, 2.1A max)
o 10ms Internal OC Blanking Timeout
o OC Blanking During Power-Up
o 125mΩ (max) High-Side MOSFET
o Short-Circuit and Thermal Protection with
Overcurrent Logic Output
o Undervoltage Lockout
o 16µA Quiescent Supply Current
o 1µA (max) Standby Supply Current
o 2.7V to 5.5V Supply Range
o UL Recognized: UL# E211395
PART TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX1922ESA+ -40°C to +85°C 8 SO
—
MAX1922ETB+ -40°C to +85°C 10 TDFN-EP* AQQ
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
*
EP = Exposed paddle.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configurations continued at end of data sheet.
MAX1922
1A Current-Limited Switch for 2 USB Ports
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 5V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
IN, EN, OC to GND...................................................-0.3V to +6V
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Maximum Switch Current.........................2.3A (internally limited)
OUT Short-Circuit to GND ..........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
10-Pin TDFN (derate 18.5mW/°C above +70°C) .......1481mW
Operating Temperature Range (extended).........-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OPERATING CONDITION
Input Voltage V
IN
2.7 5.5 V
POWER SWITCH
T
A
= +25°C V
IN
= 4.4V to 5.5V 70 100
V
IN
= 4.4V to 5.5V 125
Switch Static Drain-Source On-
State Resistance
R
DS
(
ON
)
T
A
= 0°C to +85°C
V
IN
= 3V 72 150
mΩ
Switch Turn-On Time t
ON
I
LOAD
= 400mA 80 200 µs
Switch Turn-Off Time t
OFF
I
LOAD
= 400mA 3 6 20 µs
ENABLE INPUT (EN)
V
IN
= 2.7V to 3.6V 2.0
EN High-Level Input Voltage V
IH
V
IN
= 3.7V to 5.5V 2.4
V
EN Low-Level Input Voltage V
IL
V
IN
= 2.7V to 5.5V 0.8 V
EN Input Current V
EN
= V
IN
or GND -1 1 µA
Startup Time
V
IN
= 5V, C
OUT
= 150µF from EN driven low
to 50% full V
OUT
1ms
CURRENT LIMIT
Overload Output Current I
LIMIT
Force V
OUT
to 4.5V 1.4 1.75 2.1 A
Short-Circuit Output Current I
SC
OUT shorted to GND 1 1.4 A
SUPPLY CURRENT
Supply Current, Low-Level Input V
EN
= V
IN
= V
OUT
= 5.5V 0.002 1 µA
Timer not running 16 25
Supply Current, High-Level
Input
I
Q
V
EN
= 0, I
OUT
= 0
Timer running 35
µA
T
A
= +25°C 0.01 2
Supply-Leakage Current
V
EN
= V
IN
= 5.5V,
V
OUT
= 0
T
A
= 0°C to +85°C 15
µA
UNDERVOLTAGE LOCKOUT
Undervoltage Lockout UVLO Rising edge, 100mV hysteresis 2.0 2.4 2.6 V
OVERCURRENT (OC)
OC Threshold 1.1 A
OC Output Low Voltage V
OL
I
SINK
= 1mA, V
IN
= 3V 0.4 V
MAX1922
1A Current-Limited Switch for 2 USB Ports
_______________________________________________________________________________________ 3
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS
(V
IN
= 5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OC Off-State Current V
IN
= V
OC
= 5V 1 µA
OC Blanking Timeout Period t
BL
From overcurrent condition to OC assertion 6 10 13 ms
THERMAL SHUTDOWN
Thermal Shutdown Threshold 165 °C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OPERATING CONDITION
Input Voltage V
IN
3.0 5.5 V
POWER SWITCH
V
IN
= 4.4V to 5.5V 125
Switch Static Drain-Source
On-State Resistance
R
DS
(
ON
)
V
IN
= 3V 150
mΩ
Switch Turn-On Time t
ON
I
LOAD
= 400mA 200 µs
Switch Turn-Off Time t
OFF
I
LOAD
= 400mA 1 20 µs
ENABLE INPUT (EN)
V
IN
= 3.0V to 3.6V 2.0
EN High-Level Input Voltage V
IH
V
IN
= 3.7V to 5.5V 2.4
V
EN Low-Level Input Voltage V
IL
V
IN
= 3.0V to 5.5V 0.8 V
EN Input Current V
EN
= V
IN
or GND -1 1 µA
CURRENT LIMIT
Overload Output Current I
LIMIT
Force V
OUT
to 4.5V 1.2 2.3 A
Short-Circuit Output Current I
SC
OUT shorted to GND 1.5 A
SUPPLY CURRENT
Supply Current, Low-Level Input V
EN
= V
IN
= V
OUT
= 5.5V 2 µA
Supply Current, High-Level
Input
I
Q
V
EN
= GND, I
OUT
= 0, timer not running 25 µA
Supply Leakage Current V
EN
= V
IN
= 5.5V, V
OUT
= GND 15 µA
UNDERVOLTAGE LOCKOUT
Undervoltage Lockout UVLO Rising edge, 100mV hysteresis 2.0 2.9 V
OVERCURRENT (OC)
OC Threshold 1.1 A
OC Output Low Voltage V
OL
I
SINK
= 1mA, V
IN
= 3V 0.4 V
OC Off-State Current V
IN
= V
OC
= 5V 1 µA
OC Blanking Timeout Period t
BL
From overcurrent condition to OC assertion 6 14 ms
P1-P3P4-P6P7-P9

MAX1922ESA+C71073

Mfr. #:
Buy MAX1922ESA+C71073
Manufacturer:
Maxim Integrated
Description:
Power Switch ICs - Power Distribution 1A Crnt-Ltd Switch for 2 USB Ports
Lifecycle:
New from this manufacturer.
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