MAX4840EXT-T Maxim Integrated Products, MAX4840EXT-T Datasheet

no-image

MAX4840EXT-T

Manufacturer Part Number
MAX4840EXT-T
Description
Communication ICs - Various
Manufacturer
Maxim Integrated Products
Type
Overvoltage Protection Controllerr
Datasheet

Specifications of MAX4840EXT-T

Mounting Style
SMD/SMT
Package / Case
SC-70-6
Supply Current
0.14 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX4838–MAX4842 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 MAX4838–MAX4842 turn off the low-cost
external n-channel FET(s) to prevent damage to the
protected components. An internal charge pump elimi-
nates the need for external capacitors and drives the
FET gate for a simple, robust solution.
The MAX4838/MAX4839 have a 7.4V overvoltage
threshold, and the MAX4840/MAX4841 have a 5.8V
overvoltage threshold. The MAX4842 has a 4.7V over-
voltage threshold. The MAX4838–MAX4841 have an
undervoltage lockout (UVLO) threshold of 3.25V while
the MAX4842 has a UVLO of 3.0V. In addition to the
single FET configuration, the devices can be config-
ured with back-to-back external FETs to prevent cur-
rents from being back-driven 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
MAX4838/MAX4840/MAX4842 have an open-drain
FLAG output, and the MAX4839/MAX4841 have a push-
pull FLAG output. The FLAG output asserts immediately
to an overvoltage fault.
Additional features include a 15kV ESD-protected input
(when bypassed with a 1µF capacitor) and a shutdown
pin (EN) to turn off the device (MAX4838/MAX4840/
MAX4842).
All devices are offered in a small 6-pin SC70 package
and are specified for operation from -40°C to +85°C.
19-3044; Rev 1; 4/04
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.
MAX4838EXT-T
MAX4839EXT-T
MAX4840EXT-T
MAX4841EXT-T
MAX4842EXT-T
PART
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
THRESHOLD
________________________________________________________________ Maxim Integrated Products
Overvoltage Protection Controllers with
UVLO
3.25
3.25
3.25
3.25
3.00
(V)
General Description
LEVEL
TRIP
7.4
7.4
5.8
5.8
4.7
OV
Selector Guide
(V)
Applications
INPUT
Yes
Yes
Yes
EN
No
No
Open-Drain
Open-Drain
Open-Drain
Push-Pull
Push-Pull
OUTPUT
FLAG
Pin Configuration appears at end of data sheet.
MAX4838EXT-T
MAX4839EXT-T
MAX4840EXT-T
MAX4841EXT-T
MAX4842EXT-T
+1.2V TO +28V
Overvoltage Protection Up to 28V
Preset 7.4V, 5.8V, or 4.7V Overvoltage Trip Level
Drive Low-Cost NMOS FET
Internal 50ms Startup Delay
Internal Charge Pump
Undervoltage Lockout
15kV ESD-Protected Input
Voltage Fault FLAG Indicator
6-Pin SC70 Package
PART
INPUT
1µF
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
1
6
2
TEMP RANGE
IN
EN
GND
Ordering Information
MAX4838–
MAX4842
Status FLAG
FLAG
GATE
PIN-
PACKAGE
6 SC70-6
6 SC70-6
6 SC70-6
6 SC70-6
6 SC70-6
4
3
NOTE: EN AND PULLUP
RESISTOR ON MAX4838/
MAX4840/MAX4842 ONLY.
Features
NMOS
V
OUTPUT
IO
MARK
ABW
TOP
ABY
ABX
ABZ
ACE
1

Related parts for MAX4840EXT-T

MAX4840EXT-T Summary of contents

Page 1

... Preset 7.4V, 5.8V, or 4.7V Overvoltage Trip Level Drive Low-Cost NMOS FET Internal 50ms Startup Delay Internal Charge Pump Undervoltage Lockout 15kV ESD-Protected Input Voltage Fault FLAG Indicator 6-Pin SC70 Package PART MAX4838EXT-T MAX4839EXT-T MAX4840EXT-T MAX4841EXT-T MAX4842EXT-T Applications INPUT +1.2V TO +28V 1µF EN FLAG INPUT OUTPUT ...

Page 2

Overvoltage Protection Controllers with Status FLAG ABSOLUTE MAXIMUM RATINGS IN to GND ..............................................................-0.3V to +30V GATE to GND ........................................................-0.3V to +12V EN, FLAG to GND ....................................................-0.3V to +6V Continuous Power Dissipation (T = +70°C) A 6-Pin SC70 (derate 3.1mW/°C above ...

Page 3

Overvoltage Protection Controllers with ELECTRICAL CHARACTERISTICS (continued +5V (MAX4838–MAX4841 +25°C.) (Note 1) PARAMETER SYMBOL TIMING Startup Delay FLAG Blanking Time GATE Turn-On Time GATE Turn-Off Time FLAG Assertion Delay Initial Overvoltage Fault Delay Disable Time ...

Page 4

Overvoltage Protection Controllers with Status FLAG (V = +5V, MAX4838; Si9936DY external MOSFET in back-to-back configuration MAX4842 GATE VOLTAGE vs. INPUT VOLTAGE 12 9 MAX4842 INPUT ...

Page 5

Overvoltage Protection Controllers with PIN MAX4838/ NAME MAX4839/ MAX4840/ MAX4841 MAX4842 GND FLAG GATE N. — UVLO 0V t GON t START V ...

Page 6

Overvoltage Protection Controllers with Status FLAG IN GND EN Figure 5. Functional Diagram Detailed Description The MAX4838–MAX4842 provide up to 28V overvoltage protection for low-voltage systems. When the input volt- age exceeds the overvoltage trip level, the MAX4838– MAX4842 turn ...

Page 7

Overvoltage Protection Controllers with STANDBY GATE = 0 FLAG = LOW V > UVLO IN TIMER STARTS V < UVLO IN COUNTING t = 50ms OVLO CHECK GATE = 0 FLAG = LOW V < OVLO IN STARTUP GATE DRIVEN ...

Page 8

Overvoltage Protection Controllers with Status FLAG Table 1. MOSFET Suggestions CONFIGURATION/ PART PACKAGE Si5902DC Dual/1206-8 Si1426DH Single/SC70-6 FDC6305N Dual/SSOT-6 FDC6561AN Dual/ SSOT-6 FDG315N Single/SC70-6 ability report that documents test setup, methodology, and results. Human Body Model Figure 8 shows the ...

Page 9

Overvoltage Protection Controllers with 50Ω to 100Ω 330Ω DISCHARGE CHARGE-CURRENT- RESISTANCE LIMIT RESISTOR HIGH STORAGE VOLTAGE 150pF CAPACITOR DC SOURCE Figure 10. IEC 1000-4-2 ESD Test Model Pin Configuration TOP VIEW IN 1 MAX4838– ...

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 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

Related keywords