LTC4411
2.6A Low Loss
Ideal Diode in ThinSOTTM
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DESCRIPTIO
FEATURES
Low Loss Replacement for PowerPathTM
TheLTC®4411isanidealdiodeIC,capableofsupplyingup
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.
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OR’ing Diodes
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Small Regulated Forward Voltage (28mV)
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2.6A Maximum Forward Current
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Low Forward ON Resistance (140mΩ Max)
The LTC4411 contains a 140mΩ 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 40µA for load currents up to
100mA.Iftheoutputvoltageexceedstheinputvoltage,the
MOSFET is turned off and less than 1µA of reverse current
flowsfromOUTtoIN. Maximumforwardcurrentislimited
toaconstant2.6A(typical)andinternalthermallimitingcir-
cuits protect the part during fault conditions.
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Low Reverse Leakage Current (<1µA)
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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 Monolithic Replacement
for the LTC4412
Low Quiescent Current (40µA)
■
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Low-Profile (1mm) 5-lead SOT-23 Package
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.
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APPLICATIO S
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Cellular Phones
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Handheld Computers
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Digital Cameras
USB Peripherals
An active-high control pin turns off the LTC4411 and
reduces current consumption to less than 25µA. When
shut off, the LTC4411 indicates this condition with a low
voltage on the status signal.
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Uninterrupted Supplies
Logic Controlled Power Switch
■
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT and
PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
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TYPICAL APPLICATIO
LTC4411 vs Schottky Diode
Forward Voltage Characteristics
CONSTANT I
ON
WALL
ADAPTER
INPUT
I
OC
MAX
TO
I
I
LOAD
LTC4411
V
CC
CONSTANT
IN
OUT
LTC4411
SLOPE
1/R
R
ON
ON
4.7µF
GND
CTL
470k
BATTERY
CELL(S)
FWD
STATUS OUTPUT
IS LOW WHEN WALL
ADAPTER IS SUPPLYING
LOAD CURRENT
STAT
CONSTANT
4411 F01
V
ON
SLOPE
1/R
FWD
Figure 1. Automatic Switchover of Load
Between a Battery and a Wall Adapter
SCHOTTKY
DIODE
LTC4411 FO1b
FORWARD VOLTAGE (V)
V
FWD
4411fa
1