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PDF LTC4411 Data sheet ( Hoja de datos )
| Número de pieza | LTC4411 | |
| Descripción | 2.6A Low Loss Ideal Diode | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Low Loss Replacement for PowerPathTM
OR’ing Diodes
■ Small Regulated Forward Voltage (28mV)
■ 2.6A Maximum Forward Current
■ Low Forward ON Resistance (140mΩ Max)
■ Low Reverse Leakage Current (<1µA)
■ 2.6V to 5.5V Operating Range
■ Internal Current Limit Protection
■ Internal Thermal Protection
■ No External Active Components
■ Pin-Compatible Monolithic Replacement
for the LTC4412
■ Low Quiescent Current (40µA)
■ Low-Profile (1mm) 5-lead SOT-23 Package
U
APPLICATIO S
■ Cellular Phones
■ Handheld Computers
■ Digital Cameras
■ USB Peripherals
■ Uninterrupted Supplies
■ Logic Controlled Power Switch
LTC4411
2.6A Low Loss
Ideal Diode in ThinSOTTM
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. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATIO
WALL
ADAPTER
INPUT
BATTERY
CELL(S)
IN OUT
LTC4411
GND
CTL STAT
TO
LOAD
VCC
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
IOC
IMAX
LTC4411
IFWD
SLOPE
1/RON
CONSTANT ION
CONSTANT
RON
VFWD
SLOPE
1/RFWD
CONSTANT
VON
SCHOTTKY
DIODE
FORWARD VOLTAGE (V)
LTC4411 FO1b
4411fa
1
1 page  
BLOCK DIAGRA
LTC4411
+–
IN 1
–+ P1
VGATE
5 OUT
GND 2
SHDB
OVERTEMP
VREF
CTL 3
3µA
VB
OFF A
UVLO
OUTMAX
Figure 2. Detailed Block Diagram
4 STAT
VB
10µA
4411 F02
U
OPERATIO
The LTC4411 operation is described with the aid of
Figure 3. Forward regulation for the LTC4411 has three
operation modes depending on the magnitude of the load
current. For small load currents, the LTC4411 will provide
a constant voltage drop; this operating mode is referred to
as “constant VON” regulation. As the current exceeds IFWD
the voltage drop will increase linearly with the current with
a slope of 1/RON; this operating mode is referred to as
“constant RON” regulation. As the current increases fur-
ther, exceeding IMAX, the forward voltage drop will in-
crease rapidly; this operating mode is referred to as
“constant ION” regulation. The characteristics for the
following parameters: RFWD, RON, VFWD, IFWD, and IMAX
are specified with the aid of Figure 3.
Operation begins when the power source at IN rises above
the UVLO voltage of 2.4V (typ) and the CTL (control) pin
is low. If only the voltage at the IN pin is present, the power
source to LTC4411 (VDD) will be supplied from the IN pin.
The amplifier (A) will deliver a voltage proportional to the
difference between VIN and VOUT to the gate (VGATE) of the
internal P-channel MOSFET (P1), driving this gate voltage
below VIN. This will turn on P1. As P1 conducts, VOUT will
be pulled up towards VIN. The LTC4411 will then control
VGATE to maintain a low forward voltage drop. The system
is now in forward regulation and the load at OUT will be
powered from the supply at IN. As the load current varies,
VGATE will be controlled to maintain a low forward voltage
drop. If the load current exceeds P1’s ability to deliver the
current, as VGATE approaches GND, the P1 will behave as
a fixed resistor, with resistance RON, whereby the forward
voltage will increase with increased load current. As ILOAD
increases further (ILOAD > IMAX), the LTC4411 will regulate
the load current as described below. During the forward
regulation mode of operation the STAT pin will be an open
circuit.
3.0
TA = 40°C
IOC
2.5
IMAX
2.0
LTC4411
1.5
IFWD
SLOPE
1/RON
1.0
0.5
0
0
VFWD
SLOPE
1/RFWD
SCHOTTKY
DIODE
0.25 0.5
0.75
FORWARD VOLTAGE (V)
1.0
4411 F03
Figure 3. LTC4411 vs Schottky Diode
Forward Conduction Characteristics
4411fa
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC4411.PDF ] | |
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