LTC4411

1

4411f

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

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Low Loss Replacement for PowerPath

TM

OR’ing Diodes

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Small Regulated Forward Voltage (28mV Min)

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2.6A Maximum Forward Current

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Low Forward ON Resistance (140m

Ω Max)

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Low Reverse Leakage Current (<1

µA)

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2.6V to 5.5V Operating Range

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Internal Current Limit Protection

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Internal Thermal Protection

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No External Active Components

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Pin-Compatible Low-Power Replacement

for LTC4412

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Low Quiescent Current (40

µA typical)

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Low-profile (1mm) 5-lead SOT-23 Package

2.6A Low Loss

Ideal Diode in ThinSOT

TM

The LTC

to 2.6A from an input voltage between 2.6V and 5.5V. The

LTC4411 is housed in a 5-lead 1mm profile SOT-23

package.

The LTC4411 contains a 140m

Ω P-channel MOSFET con-

necting IN to OUT. During normal forward operation, the

drop across the MOSFET is regulated to as low as 28mV.

Quiescent current is less than 40

µA for load currents up to

100mA. If the output voltage exceeds the input voltage, the

MOSFET is turned off and less than 1

µA of reverse current

flows from OUT to IN. Maximum forward current is limited

to a constant 2.6A (typical) and internal thermal limiting cir-

cuits protect the part during fault conditions.

An open-drain STAT pin indicates conduction status. The

STAT pin can be used to drive an auxiliary P-channel

MOSFET power switch connecting an alternate power

source when the LTC4411 is not conducting forward

current.

An active-high control pin turns off the LTC4411 and

reduces current consumption to less than 25

µA. When

shut off, the LTC4411 indicates this condition with a low

voltage on the status signal.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Figure 1. Automatic Switchover of Load

Between a Battery and a Wall Adapter

IN

GND

CTL

OUT

STAT

LTC4411

WALL

ADAPTER

INPUT

TO

LOAD

4.7

µF

STATUS OUTPUT

IS LOW WHEN WALL

ADAPTER IS SUPPLYING

LOAD CURRENT

BATTERY

CELL(S)

470k

4411 F01

ThinSOT and PowerPath are trademarks of Linear Technology Corporation.

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Cellular Phones

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Handheld Computers

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Digital Cameras

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USB Peripherals

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Uninterrupted Supplies

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Logic Controlled Power Switch

LTC4411 vs Schottky Diode

Forward Voltage Characteristics

LTC4411

SCHOTTKY

DIODE

CONSTANT

CONSTANT

FORWARD VOLTAGE (V)

LTC4411 FO2

SLOPE

SLOPE