MAX4943ELAT データシートの表示（PDF） - Maxim Integrated
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MAX4943ELAT Datasheet PDF : 10 Pages
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19-0552; Rev 3; 6/08
Overvoltage-Protection Controllers with
Internal FET
General Description
The MAX4943–MAX4946/MAX4949 family of overvolt-
age-protection devices feature a low 80mΩ (typ) RON
internal FET and protect low-voltage systems against
voltage faults up to +28V. These devices also drive an
optional external pFET to protect down to -28V when
connected to a load with reverse current protection.
When the input voltage exceeds the overvoltage thresh-
old, the internal FET is turned off to prevent damage to
the protected components.
All switches feature a minimum 1.2A current-limit pro-
tection. During a short-circuit occurrence, the
MAX4944B and MAX4945B place the switch in a
latchoff state where the switch turns off and remains off.
For the autoretry devices, the switch turns off and con-
tinuously checks after a 15ms (typ) retry time.
The overvoltage thresholds (OVLO) are preset to 7.4V,
6.35V, 5.8V, 4.56V, or 8.9V. The undervoltage-lockout
(UVLO) thresholds are preset to 2.45V and 4.15V.
When the input voltage drops below the undervoltage-
lockout (UVLO) threshold, the devices enter a low-
current standby mode. (See the Ordering Information/
Selector Guide for more details on UVLO/OVLO).
All devices are offered in a small, 8-pin µDFN (2mm x
2mm) package and are specified for operation over the
-40°C to +85°C temperature range.
Applications
Cell Phones
PDAs and Palmtop Devices
Digital Still Cameras MP3 Players
Features
♦ Input Voltage Protection Up to +28V
♦ Integrated nFET Switch
♦ Preset Overvoltage Protection Trip Level
7.40V (MAX4943)
6.35V (MAX4944_)
5.80V (MAX4945_)
4.56V (MAX4946)
8.90V (MAX4949)
♦ Low-Current Undervoltage-Lockout Mode
♦ Short-Circuit Protection (Latchoff/Autoretry)
♦ Internal 15ms (typ) Startup Delay and Retry Times
♦ Input Voltage Power-Good Logic Output
♦ Thermal-Shutdown Protection
♦ Small, 8-Pin (2mm x 2mm) µDFN Package
Pin Configuration
TOP VIEW
+
IN 1
IN 2
GP 3
ACOK 4
MAX4943–
MAX4946/
MAX4944L/
MAX4945A/
MAX4945L/
MAX4949
8 OUT
7 OUT
6 OUT
5 GND
µDFN
2mm × 2mm
Ordering Information/Selector Guide
PART
PIN-PACKAGE TOP MARK PKG CODE UVLO (V)
MAX4943ELA+T*
8 µDFN
ABA
L822-1
4.15
MAX4944ELA+T
8 µDFN
ABB
L822-1
4.15
MAX4944BELA+T*
8 µDFN
ABC
L822-1
4.15
MAX4944LELA+T
8 µDFN
ABD
L822-1
2.45
MAX4945ELA+T**
8 µDFN
ABE
L822-1
4.15
MAX4945AELA+T**
8 µDFN
ADW
L822-1
4.15
MAX4945BELA+T*
8 µDFN
ABF
L822-1
4.15
MAX4945LELA+T
8 µDFN
ABG
L822-1
2.45
MAX4946ELA+T
8 µDFN
ABH
L822-1
2.45
MAX4949ELA+T
8 µDFN
ADT
L822-1
2.45
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes a lead-free/RoHS-compliant package.
T = Tape-and-reel package.
*Future product—contact factory for availability.
**The OVLO is 6.10V (max) for the MAX4945ELA+T and .6.0V (max) for the MAX4945AELA+T.
OVLO (V)
7.40
6.35
6.35
6.35
5.80
5.80
5.80
5.80
4.56
8.90
OVERCURRENT MODE
Retry
Retry
Latchoff
Retry
Retry
Retry
Latchoff
Retry
Retry
Latchoff
________________________________________________________________ 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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