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PDF LTC4413 Data sheet ( Hoja de datos )
| Número de pieza | LTC4413 | |
| Descripción | Ideal Diodes | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4413
Dual 2.6A, 2.5V to 5.5V,
Ideal Diodes in 3mm × 3mm DFN
Features
Description
n 2-Channel Ideal Diode ORing or Load Sharing
n Low Loss Replacement for ORing Diodes
n Low Forward On-Resistance (100mΩ Max at 3.6V)
n Low Reverse Leakage Current (1µA Max)
n Small Regulated Forward Voltage (28mV Typ)
n 2.5V to 5.5V Operating Range
n 2.6A Maximum Forward Current
n Internal Current Limit and Thermal Protection
n Slow Turn-On/Off to Protect Against Inductive
Source Impedance-Induced Voltage Spiking
n Ultralow Quiescent Current Consumption, Low
Power Alternative to the LTC4413-1
n Status Output to Indicate if Selected Channel is
Conducting
n Programmable Channel On/Off
n Low Profile (0.75mm) 10-Lead 3mm × 3mm DFN
Package
Applications
n Battery and Wall Adapter Diode ORing in Handheld
Products
n Backup Battery Diode ORing
n Power Switching
n USB Peripherals
n Uninterruptable Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
The LTC®4413 contains two monolithic ideal diodes,
each capable of supplying up to 2.6A from input voltages
between 2.5V and 5.5V. Each ideal diode uses a 100mΩ
P-channel MOSFET that independently connects INA to
OUTA and INB to OUTB. During normal forward operation
the voltage drop across each of these diodes is regulated
to as low as 28mV. Quiescent current is less than 40µA
for diode currents up to 1A. If either of the output voltages
exceeds its respective input voltages, that MOSFET is
turned off and less than 1µA of reverse current will flow
from OUT to IN. Maximum forward current in each MOSFET
is limited to a constant 2.6A and internal thermal limiting
circuits protect the part during fault conditions.
Two active-high control pins independently turn off the
two ideal diodes contained within the LTC4413, control-
ling the operation mode as described by Table 1. When
the selected channel is reverse biased, or the LTC4413 is
put into low power standby, a status signal indicates this
condition with a low voltage.
A 9µA open-drain STAT pin is used to indicate conduction
status. When terminated to a positive supply through a
470k resistor, the STAT pin can be used to indicate that the
selected diode is conducting with a high voltage. This signal
can also be used to drive an auxiliary P-channel MOSFET
power switch to control a third alternate power source
when the LTC4413 is not conducting forward current.
The LTC4413 is housed in a 10-lead DFN package.
Typical Application
WALL
ADAPTER
(0V TO 5.5V)
10µF
ENBA
GND LTC4413
ENBB
STAT
INB OUTB
VCC
470k
STAT IS HIGH WHEN
BAT IS SUPPLYING
LOAD CURRENT
CONTROL CIRCUIT
INA
BAT
OUTA
4.7µF
TO LOAD
4413 TA01
LTC4413 vs 1N5817 Schottky
2000
1500
1000
LTC4413
500
1N5817
0
0 100 200 300 400
VFWD (mV)
4413 TA01b
For more information www.linear.com/LTC4413
4413fd
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1 page  
Typical Performance Characteristics
LTC4413
VFWD and RFWD vs ILOAD
300
120°C
80°C
VFWD
250 40°C
0°C
200 –40°C
RFWD
150
100
50
0
1 10 100 1000 10000
ILOAD (mA)
4413 G09
VFWD vs ILOAD (VIN = 3.5V)
300
120°C
80°C
250 40°C
0°C
200 –40°C
150
Response to 800mA Load Step
in 80µs
IN
200mV/DIV
OUT
200mV/DIV
IOUT
200mA/DIV
100
50
0
1
10
100
1000
10000
ILOAD (mA)
4413 G10
20µs/DIV
4413 G17
ENBA, ENBB Turn-On, 240µs to
Recover with 180mA Load
ENBA, ENBB Turn-Off, 16µs to
Disconnect IN from 180mA Load
INA, INB
1V/DIV
ENBA, ENBB
1V/DIV
OUTA, OUTB
1V/DIV
IOUTA, IOUTB
500mA/DIV
VOUTA, VOUTB
VENBA, VENBB
100µs/DIV
4413 G11
4µs/DIV
INA, INB
1V/DIV
OUTA, OUTB
1V/DIV
ENBA, ENBB
1V/DIV
IOUTA, IOUTB
100mA/DIV
4413 G12
ENBA, ENBB Threshold vs
Temperature
550
VENBIH
500
450
VENBIL
400
350
300
–40
0 40 80
TEMPERATURE (°C)
120
4413 G13
ENBA, ENBB Hysteresis vs
Temperature
120
100
80
60
40
20
0
–40
0 40 80
TEMPERATURE (°C)
120
4413 G14
– ILEAK vs Temperature at
VREVERSE = 5.5V
10E-6
1E-6
100E-9
10E-9
1E-9
–40
0 40 80
TEMPERATURE (°C)
120
4413 G15
For more information www.linear.com/LTC4413
4413fd
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5 Page 
LTC4413
Applications Information
If the AUX is present when a wall adapter is applied, as
the resistive divider to ENBB rises through the turn-off
threshold, the STAT pin voltage falls and MP1 conducts,
allowing the wall adapter to power the load. When the wall
adapter is removed while the AUX supply is present, the
load voltage falls until the voltage divider at the ENBB pin
falls through its turn-on threshold. Once this occurs, the
LTC4413 automatically connects the AUX supply to the load
when the AUX voltage exceeds the output voltage, causing
the STAT voltage to rise and disabling the external PFET.
When an AUX supply is attached, the voltage divider at
ENBA (R4 and R5) disconnects the battery from the load,
and the auxiliary supply provides load current, unless a
wall adapter is present as described earlier. If the auxiliary
supply is removed, the battery may again power the load,
depending on if a wall adapter is present.
Multiple Battery Charging
Figure 6 illustrates an application circuit for automatic dual
battery charging from a single charger. Whichever battery
has the lower voltage will receive the larger charging current
BATTERY
CHARGER
INPUT
LTC4413
STAT
9
IDEAL
1 INA OUTA 10
IDEAL
5 INB OUTB 6
2 ENBA
4 ENBB
3,11 GND
4413 F06
STAT IS HIGH
470k WHEN BAT1
IS CHARGING
LOAD1
BAT1
LOAD2
BAT2
Figure 6
until both battery voltages are equal, then both are charged.
While both batteries are charging simultaneously, the
higher capacity battery gets proportionally higher current
from the charger. For Li-Ion batteries, both batteries achieve
the float voltage minus the forward regulation voltage of
20mV. This concept can apply to more than two batteries.
The STAT pin provides information as to when battery 1
is being charged. For intelligent control, the ENBA/ENBB
pin inputs can be used with a microcontroller as shown
in Figure 4.
Automatic Switchover from a Battery to a Wall
Adapter and Charger
Figure 7 illustrates the LTC4413 performing the function
of automatically switching a load over from a battery to a
wall adapter while controlling an LTC4059 battery charger.
When no wall adapter is present, the LTC4413 connects
the load at OUTA from the Li-Ion battery at INA. In this
condition, the STAT voltage is high, thereby disabling the
battery charger. If a wall adapter of a higher voltage than
the battery is connected to INB, the load voltage rises as
the second ideal diode conducts. As soon as the OUTA
voltage exceeds INA voltage, the BAT is disconnected
from the load and the STAT voltage falls, turning on the
LTC4059 battery charger and beginning a charge cycle. If
the wall adapter is removed, the voltage at INB collapses
until it is below the load voltage. When this occurs, the
LTC4413 automatically reconnects the battery to the load
and the STAT voltage rises, disabling the LTC4059 battery
charger. One major benefit of this circuit is that when a
wall adapter is present, the user may remove the battery
and replace it without disrupting the load.
For more information www.linear.com/LTC4413
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC4413.PDF ] | |
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