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MAX4838AELT+ 数据手册 - Maxim Integrated（美信）
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MAX4838AELT+数据手册
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General Description
The MAX4838A/MAX4840A/MAX4842A are overvoltage-
protection ICs that protect low-voltage systems against
voltages of up to +28V. If the input voltage exceeds the
overvoltage trip level, the MAX4838A/MAX4840A/
MAX4842A turn off the low-cost external n-channel
FET(s) to prevent damage to the protected components.
An internal charge pump eliminates the need for external
capacitors and drives the FET gate for a simple,
robust solution.
The MAX4838A has a 7.4V overvoltage threshold, and
the MAX4840A has a 5.8V overvoltage threshold. The
MAX4842A has a 4.7V overvoltage threshold. The
MAX4838A/MAX4840A have an undervoltage-lockout
(UVLO) threshold of 3.25V, while the MAX4842A has a
UVLO of 2.5V. In addition to the single FET configura-
tion, the devices can be configured with back-to-back
external FETs to prevent currents from being back-dri-
ven into the adapter.
On power-up, the device waits for 50ms before driving
GATE high. FLAG is held low for an additional 50ms
after GATE goes high before deasserting. The
MAX4838A/MAX4840A/MAX4842A have an open-drain
FLAG output. The FLAG output asserts immediately to
an overvoltage fault.
Additional features include a ±15kV (HBM) ESD-pro-
tected input (when bypassed with a 1µF capacitor) and
a shutdown pin (EN) to turn off the device.
All devices are offered in a small 6-pin SC70 and 6-pin
1.5mm x 1.0mm µDFN packages and are specified
over the -40°C to +85°C extended temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
Features
♦ Overvoltage Protection Up to +28V
♦ Preset 7.4V, 5.8V, or 4.7V Overvoltage Trip Level
♦ Drives Low-Cost nMOS FET
♦ Internal 50ms Startup Delay
♦ Internal Charge Pump
♦ Undervoltage Lockout
♦ ±15kV ESD-Protected Input
♦ Voltage Fault FLAG Indicator
♦ 6-Pin SC70 and µDFN Packages
♦ Lead Free
MAX4838A/MAX4840A/MAX4842A
Overvoltage-Protection Controllers with
Status
FLAG
________________________________________________________________ Maxim Integrated Products 1
MAX4838A
MAX4840A
MAX4842A
INPUT
+1.2V TO +28V
IN
EN
GATE
FLAG
GND
1
6
4
2
3
OUTPUT
V
IO
1µF
NOTE: EN AND PULLUP
RESISTOR
NMOS
Typical Operating Circuit
Ordering Information
19-3979; Rev 0; 2/06
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.
Pin Configuration appears at end of data sheet.
PART
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX4838AEXT+T 6 SC70 ACY X6S-1
MAX4838AELT+ 6 µDFN KU
L611-1
MAX4840AEXT+T 6 SC70 ACZ X6S-1
MAX4840AELT+ 6 µDFN KV
L611-1
MAX4842AEXT+T 6 SC70 ADA X6S-1
MAX4842AELT+* 6 µDFN KW
L611-1
Selector Guide
PART
UVLO
THRESHOLD
(V)
OV
TRIP
LEVEL
(V)
EN
INPUT
FLAG
OUTPUT
MAX4838A 3.25 7.4
Yes
Open-Drain
MAX4840A 3.25 5.8
Yes
Open-Drain
MAX4842A 2.50 4.7
Yes
Open-Drain
Note: All devices specified for the -40°C to +85°C extended
temperature range.
*Future product—contact factory for availability.
+Denotes lead-free package.
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