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MAX4845EYT+C5Y

Description
current & power monitors & regulators overvoltage protect controller
Categorysemiconductor    Other integrated circuit (IC)   
File Size181KB,10 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Environmental Compliance  
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MAX4845EYT+C5Y Overview

current & power monitors & regulators overvoltage protect controller

19-3649; Rev 5; 12/09
Overvoltage Protection Controllers with
Low Standby Current
General Description
The MAX4843–MAX4846 overvoltage protection con-
trollers protect low-voltage systems against high-voltage
faults of up to 28V. When the input voltage exceeds the
overvoltage threshold, these devices turn off a low-cost,
external n-channel FET(s) to prevent damage to the pro-
tected components. An internal charge pump eliminates
the need for external capacitors and drives the FET gate
for a simple, robust solution.
The overvoltage trip level is set to 7.4V (MAX4843),
6.35V (MAX4844), 5.8V (MAX4845), or 4.65V
(MAX4846). When the input voltage drops below the
undervoltage lockout (UVLO) threshold, the devices
enter a low standby current mode (10µA). The
MAX4843/MAX4844/MAX4845 have a UVLO threshold
of 4.15V, the MAX4845C/MAX4845D have a UVLO
threshold of 2.2V, and the MAX4846 has a UVLO
threshold of 2.5V. In addition to the single FET configu-
ration, the devices can be configured with back-to-
back external FETs to prevent currents from being
back-driven into the adapter.
An additional feature includes a ±15kV ESD-protected
input when bypassed with a 1µF capacitor to ground.
All devices are offered in small 6-pin µDFN (1.5mm x
1.0mm) and 6-pin ultra-thin LGA (MAX4845 and
MAX4846 only) (1.5mm x 1.0mm) packages and are
specified for operation over the -40°C to +85°C temper-
ature range.
Overvoltage Protection Up to 28V
Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip
Level
Low (10µA) Undervoltage Lockout Standby
Current
Drives Low-Cost nMOSFET
Internal 50ms Startup Delay
Internal Charge Pump
Overvoltage Fault FLAG Indicator
6-Pin (1.5mm x 1.0mm) µDFN Package
Features
MAX4843–MAX4846
Ordering Information
PART
MAX4843ELT
MAX4844ELT
MAX4845ELT
MAX4845EYT+T
MAX4845CEYT+T
MAX4845DEYT+T
MAX4846ELT
MAX4846EYT+T
PIN-
PACKAGE
6 μDFN
6 μDFN
6 μDFN
6 UTLGA
6 UTLGA
6 UTLGA
6 μDFN
6 UTLGA
UVLO
(V)
4.15
4.15
4.15
4.15
2.20
2.20
2.50
2.50
OVLO
(V)
7.40
6.35
5.80
5.80†
5.80†
5.80
4.65
4.65
TOP
MARK
BE
BF
BG
AC
AP
AQ
BH
AD
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
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.
†OVLO maximum is 6.0V for the MAX4845C and 5.9V for the
MAX4845D.
Typical Operating Circuit
INPUT
+1.2V TO +28V
Pin Configurations
TOP VIEW
N.C.
6
N.C.
5
GATE
4
N.C.
6
N.C.
5
GATE
4
N
OUTPUT
1
1μF
IN
GATE
4
V
IO
MAX4843–
MAX4846
1
2
GND
3
FLAG
1
IN
MAX4845
MAX4846
2
GND
3
FLAG
MAX4843–
MAX4846
2
GND
FLAG
3
IN
μDFN
ULTRA-THIN LGA
________________________________________________________________
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.

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