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PDF MAX14545 Data sheet ( Hoja de datos )

Número de pieza MAX14545
Descripción (MAX14544 / MAX14545) ILIM VBUS Accessory Switch
Fabricantes Maxim Integrated Products 
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No Preview Available ! MAX14545 Hoja de datos, Descripción, Manual

19-5037; Rev 0; 1/10
28V-Capable, ILIM VBUS Accessory Switch
General Description
The MAX14544/MAX14545 are overcurrent detection
switches that can provide power to external accesso-
ries while preventing the host device from damage due
to faulty overload conditions. These analog switches
feature a 270mω (typ) on-resistance and operate from
a +2.3V to +5.5V input voltage range. The selectable
current limit of 200mA or 400mA makes them ideal for
load-switching applications.
The MAX14544 has an autoretry feature, whereas the
MAX14545 has a latchoff feature. When the switch is off,
OUT can withstand 28V maximum. When the switch is on
and a load is connected to the port, a blanking time of
10.5ms ensures that the transient voltage settles down.
After this blanking time, if the voltage across the switch is
greater than the FLAG assertion voltage, the switch turns
off and then a FLAG is issued to the microprocessor.
After the retry time, the device recloses for the duration
of the blanking time to check if the load current is lower
than the limit. The MAX14544 repeats this cycle if the
overload condition is present. During the cycle, FLAG
remains asserted. The MAX14544 remains on after the
overload condition is removed and FLAG deasserts. For
the MAX14545, after the blanking time, the switch turns
off and then a FLAG is issued to the microprocessor. The
switch can be turned on again by cycling the power or
the EN input.
The MAX14544/MAX14545 have additional safety fea-
www.DatutarSehseetht4aUt .icnocmlude thermal shutdown protection, reverse-
current blocking, and overvoltage protection.
The MAX14544/MAX14545 are offered in a space-sav-
ing, 8-pin, 2mm x 2mm TDFN package, and operate over
the -40NC to +85NC extended temperature range.
Cell Phones
MP3 Players
PDAs
Digital Cameras
eBook
MID
Applications
Typical Operating Circuit appears at end of data sheet.
Features
S 200mA or 400mA Selectable Current Limit
S Output Capable of Withstanding +28V
S Reverse-Current Shutdown Protection
S +2.3V to +5.5V Input Operation Range
S Undervoltage Lockout
S Autoretry or Latchoff Option
S Thermal Shutdown Protection
S 0.1µA (typ) Shutdown Current
S 5µs Fast Current-Limit Detect
S 8-Pin TDFN (2mm x 2mm) Package
S -40NC to +85NC Operating Temperature Range
Ordering Information/
Selector Guide
PART
PIN-
PACKAGE
TOP
RETRY/
MARK LATCHOFF
MAX14544ETA+T 8 TDFN-EP* ACY
Autoretry
MAX14545ETA+T 8 TDFN-EP* ACZ
Latchoff
Note: All devices are specified over the -40°C to +85°C tem-
perature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
+
IN 1
IN 2
ISET 3
GND 4
MAX14544
MAX14545
*EP
8 OUT
7 OUT
6 EN
5 FLAG
TDFN
*CONNECT EXPOSED PAD TO GND.
________________________________________________________________ Maxim Integrated Products   1
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.

1 page




MAX14545 pdf
28V-Capable, ILIM VBUS Accessory Switch
Typical Operating Characteristics
(VIN = +3.3V, CIN = 10FF, COUT = 1FF, TA = +25NC, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
450
VEN = VIN
400
350
300
250
200
150
100
50
0
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
NORMALIZED CURRENT LIMIT
vs. TEMPERATURE
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
www.DataS0h.9e7et4U.com
0.96
0.95
-40
-15 10 35 60
TEMPERATURE (°C)
85
SHUTDOWN REVERSE CURRENT
vs. TEMPERATURE
1000
VIN = 2.3V
950 VOUT = 5V
900
850
800
750
700
-40
-15 10 35 60
TEMPERATURE (°C)
85
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
450
VEN = VIN
400
350
300 VIN = 5V
250
200
VIN = 3.3V
150
100
50
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
900
VOUT = 5V
800
700
600
500 VIN = 5V
400
300
200
100 VIN = 2.3V
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
NORMALIZED ON-RESISTANCE
vs. SUPPLY VOLTAGE
1.5
1.4 IOUT = 100mA
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1
SUPPLY VOLTAGE (V)
5.5
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
2.3
NORMALIZED CURRENT LIMIT
vs. SUPPLY VOLTAGE
2.7 3.1 3.5 3.9 4.3 4.7 5.1
SUPPLY VOLTAGE (V)
5.5
SHUTDOWN FORWARD CURRENT
vs. TEMPERATURE
900
VOUT = 0V
800
700
600
500 VIN = 5V
400
300
200
100 VIN = 2.3V
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
1.5
1.4 IOUT = 100mA
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
-40
-15 10 35 60
TEMPERATURE (°C)
85
5

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