MAX4945AELA+T Maxim Integrated Products, MAX4945AELA+T Datasheet

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MAX4945AELA+T

Manufacturer Part Number
MAX4945AELA+T
Description
IC CTLR OVP W/FET 5.80V 8-UDFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX4945AELA+T

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX4945AELA+T
MAX4945AELA+TTR
The MAX4943–MAX4946/MAX4949 family of overvolt-
age-protection devices feature a low 80mΩ (typ) R
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.
19-0552; Rev 3; 6/08
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.
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.
MAX4943ELA+T*
MAX4944ELA+T
MAX4944BELA+T*
MAX4944LELA+T
MAX4945ELA+T**
MAX4945AELA+T**
MAX4945BELA+T*
MAX4945LELA+T
MAX4946ELA+T
MAX4949ELA+T
Cell Phones
Digital Still Cameras
PART
________________________________________________________________ Maxim Integrated Products
Overvoltage-Protection Controllers with
PIN-PACKAGE
General Description
8 µDFN
8 µDFN
8 µDFN
8 µDFN
8 µDFN
8 µDFN
8 µDFN
8 µDFN
8 µDFN
8 µDFN
PDAs and Palmtop Devices
MP3 Players
Applications
TOP MARK
ADW
ABA
ABB
ABC
ABD
ABG
ABH
ABE
ABF
ADT
PKG CODE
ON
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
Ordering Information/Selector Guide
♦ Input Voltage Protection Up to +28V
♦ Integrated nFET Switch
♦ Preset Overvoltage Protection Trip Level
♦ 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
7.40V (MAX4943)
6.35V (MAX4944_)
5.80V (MAX4945_)
4.56V (MAX4946)
8.90V (MAX4949)
UVLO (V)
4.15
4.15
4.15
2.45
4.15
4.15
4.15
2.45
2.45
2.45
TOP VIEW
ACOK
GP
IN
IN
1
2
4
OVLO (V)
3
+
2mm × 2mm
7.40
6.35
6.35
6.35
5.80
5.80
5.80
4.56
8.90
5.80
MAX4944L/
MAX4945A/
MAX4945L/
MAX4943–
MAX4946/
MAX4949
Internal FET
µDFN
Pin Configuration
OVERCURRENT MODE
8
7
6
5
OUT
OUT
OUT
GND
Latchoff
Latchoff
Latchoff
Features
Retry
Retry
Retry
Retry
Retry
Retry
Retry
1

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MAX4945AELA+T Summary of contents

Page 1

... Denotes a lead-free/RoHS-compliant package 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. ________________________________________________________________ Maxim Integrated Products 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. ...

Page 2

Overvoltage-Protection Controllers with Internal FET ABSOLUTE MAXIMUM RATINGS IN ............................................................................-0.3V to +30V OUT ...............................................................-0.3V to (IN + 0.3V) GP...........................................................................-0.3V to +12V ..................................................................-0.3V to +22V ACOK .......................................................................-0.3V to +6V Continuous Power Dissipation (T = +70°C) A 8-Pin µDFN ...

Page 3

Overvoltage-Protection Controllers with ELECTRICAL CHARACTERISTICS (continued +5V (MAX4943/MAX4944_/MAX4945_/MAX4949 Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL ACOK Output-Low Voltage ACOK High-Leakage Current Thermal Shutdown Thermal-Shutdown Hysteresis Load Capacitor TIMING CHARACTERISTICS (Figure 2) ...

Page 4

Overvoltage-Protection Controllers with Internal FET (T = +25°C, unless otherwise noted.) A NORMALIZED OVLO THRESHOLD vs. TEMPERATURE 1.010 1.008 1.006 1.004 1.002 1.000 0.998 0.996 0.994 0.992 0.990 -40 - TEMPERATURE (°C) POWER-UP RESPONSE 10ms/div SHORT-CIRCUIT FAULT ...

Page 5

Overvoltage-Protection Controllers with PIN NAME Voltage Input. IN powers the charge pump required to turn on the internal switch. When the correct adapter is plugged in, a 15ms (typ) debouncer prevents false turn-on of the internal switch. Bypass 1, 2 ...

Page 6

Overvoltage-Protection Controllers with Internal FET OUT t INDBC t ACOK ACOK Figure 2. Timing Diagram Device Operation The MAX4943–MAX4946/MAX4949 have an internal oscillator and charge pump that control the turn-on of the internal switch. The internal oscillator ...

Page 7

Overvoltage-Protection Controllers with When the input voltage goes above ground, GP pulls low and turns on the pFET. An internal clamp protects the pFET by ensuring that the voltage does not exceed 19V (max) when the input ...

Page 8

Overvoltage-Protection Controllers with Internal FET ed device does not allow current to flow into OUT. The pFET is turned off when the voltage between GP and IN is less than the pFET gate threshold voltage. ESD Test Conditions ESD performance ...

Page 9

Overvoltage-Protection Controllers with For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 8 µDFN _______________________________________________________________________________________ Package Information PACKAGE CODE L822-1 Internal FET DOCUMENT NO. 21-0164 9 ...

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 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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