LTC4411 Datasheet, PDF (1/8 Pages) Linear Technology – 2.6A Low Loss Ideal Diode in ThinSOT

FEATURES
s _{Low Loss Replacement for PowerPath}^TM
OR’ing Diodes
s _{Small Regulated Forward Voltage (28mV Min)}
s _{2.6A Maximum Forward Current}
s _{Low Forward ON Resistance (140mΩ Max)}
s _{Low Reverse Leakage Current (<1µA)}
s _{2.6V to 5.5V Operating Range}
s _{Internal Current Limit Protection}
s _{Internal Thermal Protection}
s _{No External Active Components}
s _{Pin-Compatible Low-Power Replacement}
for LTC4412
s _{Low Quiescent Current (40µA typical)}
s _{Low-profile (1mm) 5-lead SOT-23 Package}
U
APPLICATIO S
s _{Cellular Phones}
s _{Handheld Computers}
s _{Digital Cameras}
s _{USB Peripherals}
s _{Uninterrupted Supplies}
s _{Logic Controlled Power Switch}
LTC4411
2.6A Low Loss
Ideal Diode in ThinSOT^TM
DESCRIPTIO
The LTC^®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 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. If the output voltage exceeds the input voltage, the
MOSFET is turned off and less than 1µA 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 25µA. 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.
TYPICAL APPLICATIO
WALL
ADAPTER
INPUT
BATTERY
CELL(S)
IN
OUT
LTC4411
GND
CTL _STAT
TO
LOAD
V_CC
4.7µF
470k
STATUS OUTPUT
IS LOW WHEN WALL
ADAPTER IS SUPPLYING
LOAD CURRENT
4411 F01
Figure 1. Automatic Switchover of Load
Between a Battery and a Wall Adapter
LTC4411 vs Schottky Diode
Forward Voltage Characteristics
I_OC
I_MAX
LTC4411
I_FWD
SLOPE
1/R_ON
CONSTANT I_ON
CONSTANT
R_ON
V_FWD
SLOPE
1/R_FWD
CONSTANT
V_ON
SCHOTTKY
DIODE
FORWARD VOLTAGE (V)
LTC4411 FO2
4411f
1