MAX14544ETA+T Maxim Integrated Products, MAX14544ETA+T Datasheet

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MAX14544ETA+T

Manufacturer Part Number
MAX14544ETA+T
Description
IC ACCY SWITCH OVP PROTECT 8TDFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX14544ETAT.pdf (10 pages)

Specifications of MAX14544ETA+T

Function
Current Switch
Voltage - Input
2.3 ~ 5.5 V
Current - Output
Adjustable
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TDFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Accuracy
-
Sensing Method
-
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-
tures that include 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.
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.
19-5037; Rev 0; 1/10
Typical Operating Circuit appears at end of data sheet.
Cell Phones
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eBook
MID
28V-Capable, I
_______________________________________________________________ Maxim Integrated Products 1
General Description
Applications
LIM
V
S
S
S
S
S
S
S
S
S
S
S
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.
BUS
MAX14544ETA+T
MAX14545ETA+T
200mA or 400mA Selectable Current Limit
Output Capable of Withstanding +28V
Reverse-Current Shutdown Protection
+2.3V to +5.5V Input Operation Range
Undervoltage Lockout
Autoretry or Latchoff Option
Thermal Shutdown Protection
0.1µA (typ) Shutdown Current
5µs Fast Current-Limit Detect
8-Pin TDFN (2mm x 2mm) Package
-40NC to +85NC Operating Temperature Range
PART
TOP VIEW
*CONNECT EXPOSED PAD TO GND.
Accessory Switch
GND
ISET
IN
IN
+
1
2
3
4
PIN-
PACKAGE
Ordering Information/
8 TDFN-EP*
8 TDFN-EP*
MAX14544
MAX14545
TDFN
Pin Configuration
Selector Guide
*EP
MARK
TOP
ACY
ACZ
8
7
6
5
Features
OUT
OUT
EN
FLAG
LATCHOFF
Autoretry
RETRY/
Latchoff

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MAX14544ETA+T Summary of contents

Page 1

... TDFN (2mm x 2mm) Package S -40NC to +85NC Operating Temperature Range S Ordering Information/ PIN- PART PACKAGE MAX14544ETA+T 8 TDFN-EP* MAX14545ETA+T 8 TDFN-EP* Note: All devices are specified over the -40°C to +85°C tem- perature range. +Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. *EP = Exposed pad. ...

Page 2

I ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) OUT .......................................................................-0.3V to +30V IN, FLAG, EN, ISET ..............................................-0.3V to +6.0V Continuous Power Dissipation (T = +70NC) A 8-Pin TDFN (derate 11.9mW/NC above +70NC) ...........953mW Junction-to-Ambient Thermal Resistance (Note 1) ..............................................................83.9NC/W ...

Page 3

I ELECTRICAL CHARACTERISTICS (continued +2.3V to +5.5V -40NC to +85NC, unless otherwise noted. Typical values are PARAMETER SYMBOL Input Logic-High Voltage Input Logic-Low Voltage Input Leakage Output Logic-Low Voltage Output High ...

Page 4

I CURRENT LIMIT LOAD CURRENT ON SWITCH OFF FLAG ON EN OFF Figure 1. MAX14544 Timing Diagram (Waveforms Not to Scale) CURRENT LIMIT LOAD CURRENT Figure 2. MAX14545 Timing Diagram (Waveforms Not to Scale Accessory Switch LIM ...

Page 5

+3.3V 10FF 1FF OUT QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE 450 400 350 300 250 200 150 100 50 0 2.3 2.7 3.1 3.5 ...

Page 6

+3.3V 10FF 1FF OUT SWITCH TURN-ON TIME vs. TEMPERATURE 100Ω -40 ...

Page 7

I PIN NAME Input Voltage. Connect IN pins 1 and 2 together and bypass IN to GND with a 10FF ceramic capacitor close to the device as possible. Current-Limit Setting. Drive ISET low to have ...

Page 8

I Detailed Description The MAX14544/MAX14545 are overcurrent detection switches that prevent host devices from being damaged due to faulty load conditions. The switch opens if current exceeds the current limit for longer than the blanking time ...

Page 9

I fault-blanking timeout, FLAG asserts low. FLAG is not asserted when load-transient fault is less than t The fault blanking time only applies to forward current- limit faults. A reverse current-limit fault, thermal fault, or OVP fault causes FLAG ...

Page 10

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2010 Maxim Integrated Products © ...

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