LTC4411
2.6A Low Loss
Ideal Diode in ThinSOT
TM
FEATURES
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DESCRIPTIO
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Low Loss Replacement for PowerPath
TM
OR鈥檌ng Diodes
Small Regulated Forward Voltage (28mV Min)
2.6A Maximum Forward Current
Low Forward ON Resistance (140m鈩?Max)
Low Reverse Leakage Current (<1碌A(chǔ))
2.6V to 5.5V Operating Range
Internal Current Limit Protection
Internal Thermal Protection
No External Active Components
Pin-Compatible Low-Power Replacement
for LTC4412
Low Quiescent Current (40碌A(chǔ) typical)
Low-profile (1mm) 5-lead SOT-23 Package
The LTC
廬
4411 is an ideal diode IC, capable of supplying up
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鈩?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碌A(chǔ) for load currents up to
100mA. If the output voltage exceeds the input voltage, the
MOSFET is turned off and less than 1碌A(chǔ) 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碌A(chǔ). 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.
ThinSOT and PowerPath are trademarks of Linear Technology Corporation.
APPLICATIO S
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Cellular Phones
Handheld Computers
Digital Cameras
USB Peripherals
Uninterrupted Supplies
Logic Controlled Power Switch
TYPICAL APPLICATIO
WALL
ADAPTER
INPUT
IN
BATTERY
CELL(S)
OUT
LTC4411
GND
CTL
STAT
TO
LOAD
V
CC
4.7碌F
470k
I
MAX
I
OC
LTC4411
SLOPE
1/R
ON
CONSTANT
R
ON
CURRENT (A)
STATUS OUTPUT
IS LOW WHEN WALL
ADAPTER IS SUPPLYING
LOAD CURRENT
4411 F01
I
FWD
Figure 1. Automatic Switchover of Load
Between a Battery and a Wall Adapter
V
FWD
U
LTC4411 vs Schottky Diode
Forward Voltage Characteristics
CONSTANT I
ON
SLOPE
1/R
FWD
SCHOTTKY
DIODE
LTC4411 FO2
U
U
CONSTANT
V
ON
FORWARD VOLTAGE (V)
4411f
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