LTC4413
1
4413fd
For more information www.linear.com/LTC4413
Typical applicaTion
DescripTion
Dual 2.6A, 2.5V to 5.5V,
Ideal Diodes in 3mm
×
3mm DFN
The LT C
®
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.
LTC4413 vs 1N5817 Schottky
FeaTures
applicaTions
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
n Battery and Wall Adapter Diode ORing in Handheld
Products
n Backup Battery Diode ORing
n Power Switching
n USB Peripherals
n Uninterruptable Supplies
V
FWD
(mV)
0
I
OUT
(mA)
1000
1500
400
4413 TA01b
500
0100 200 300
2000
LTC4413
1N5817
ENBA
GND
ENBB
470k
V
CC
INA
BAT
10µF
4.7µF
4413 TA01
TO LOAD
STAT IS HIGH WHEN
BAT IS SUPPLYING
LOAD CURRENT
WALL
ADAPTER
(0V TO 5.5V)
OUTA
INB OUTB
STAT
CONTROL CIRCUIT
LTC4413
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.
LTC4413
2
4413fd
For more information www.linear.com/LTC4413
absoluTe MaxiMuM raTings
INA, INB, OUTA, OUTB, STAT,
ENBA, ENBB Voltage .................................... –0.3V to 6V
Operating Temperature Range..................–40°C to 85°C
Storage Temperature Range ...................–65°C to 125°C
Junction Temperature (Note 4) ............................. 125°C
Continuous Power Dissipation
(Derate 25mW/°C Above 70°C) .........................1500mW
(Note 1)
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
OUTA
STAT
NC
NC
OUTB
INA
ENBA
GND
ENBB
INB
TJMAX = 125°C, θJA = 40°C/W (4-LAYER PCB)
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 2, 6)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN, VOUT Operating Supply Range for Channel A or B VIN and/or VOUT Must Be in This Range
for Proper Operation
l2.5 5.5 V
UVLO UVLO Turn-On Rising Threshold Max (VINA, VINB , VOUTA, VOUTB)l2.4 V
UVLO Turn-Off Falling Threshold Max (VINA, VINB , VOUTA, VOUTB)l1.7 V
IQF Quiescent Current in Forward Regulation (Note 3) VINA = 3.6V, IOUTA = –100mA, VINB = 0V,
IOUTB = 0mA
l25 40 µA
IQRIN Quiescent Current While in Reverse
Turn-Off, Current Drawn from VIN
VIN = 3.6V, VOUT = 5.5V (Note 6) l–1 0.5 2 µA
IQRGND Quiescent Current While in Reverse Turn-Off,
Measured Via GND
VINA = VINB = VOUTB = 0V, VOUTA = 5.5V,
VSTAT = 0V
22 30 µA
IQROUTA Quiescent Current While in Reverse Turn-Off,
Current Drawn from VOUTA When OUTA
Supplies Chip Power
VINA = VINB = VOUTB = 0V, VOUTA = 5.5V l17 31 µA
IQROUTB Quiescent Current While in Reverse Turn-Off,
Current Drawn from VOUTA When OUTB
Supplies Chip Power
VINA = VINB = 0V, VOUTA < VOUTB = 5.5V l2 3 µA
IQOFF Quiescent Current with Both ENBA
and ENBB High
VINA = VINB = 3.6V, VENBA and
VENBB High, VSTAT = 0V
l20 31 µA
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4413EDD#PBF LTC4413EDD#TRPBF LBGN 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
pin conFiguraTion
orDer inForMaTion
LTC4413
3
4413fd
For more information www.linear.com/LTC4413
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4413 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Quiescent current increases with diode current, refer to plot of IQF
vs IOUT.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Overtemperature protection will become active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
Note 5: This specification is guaranteed by correlation to wafer-level
measurements.
Note 6: Unless otherwise specified, current into a pin is positive and
current out of a pin is negative. All voltages referenced to GND.
Note 7: Guaranteed by design.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ILEAK VINA or VINB Current When VOUTA or VOUTB
Supplies Power
VIN = 0V, VOUT = 5.5V –1 1 µA
VRTO Reverse Turn-Off Voltage (VOUT – VIN) VIN = 3.6V –5 10 mV
VFWD Forward Voltage Drop (VIN – VOUT)
at IOUT = –1mA
VIN = 3.6V l28 38 mV
RFWD On-Resistance, RFWD Regulation
(Measured as ∆V/∆I)
VIN = 3.6V, IOUT = –100mA to –500mA
(Note 5)
100 140 mΩ
RON On-Resistance, RON Regulation
(Measured as V/I at IIN = 1A)
VIN = 3.6V, IOUT = –1.0A (Note 5) 140 200 mΩ
tON PowerPath™ Turn-On Time VIN = 3.6V, from ENBA, ENBB Falling to IIN
Ramp Starting (Note 7)
50 µs
tOFF PowerPath Turn-Off Time VIN = 3.6V, IOUT = –100mA (Note 7) 4 µs
Short-Circuit Response
IOC Current Limit VINX = 3.6V (Notes 4, 5) 1.8 A
IQOC Quiescent Current While in
Overcurrent Operation
VINX = 3.6V, IOUT = 1.9A (Notes 4, 5) 150 300 µA
STAT Output
ISOFF STAT Off Current Shutdown l–1 0 1 µA
ISON STAT Sink Current VIN > VOUT, VENBA < VENBIL, VENBB < VENBIL,
IOUT < IMAX
7 9 17 µA
tS(ON) STAT Pin Turn-On Time 1 µs
tS(OFF) STAT Pin Turn-Off Time 1 µs
ENB Inputs
VENBIH ENBA, ENBB Inputs Rising Threshold Voltage VENBA, VENBB Rising l540 600 mV
VENBIL ENBA, ENBB Inputs Falling Threshold Voltage VENBA, VENBB Falling l400 460 mV
VENBHYST ENBA, ENBB Inputs Hysteresis VENBHYST = (VENBIH – VENBIL) 90 mV
IENB ENBA, ENBB Inputs Pull-Down Current VOUT < VIN = 3.6V, VENBA > VENBIL,
VENBB > VENBIL
l1.5 3 4.5 µA
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 2, 6)
LTC4413
4
4413fd
For more information www.linear.com/LTC4413
Typical perForMance characTerisTics
RFWD vs Temperature (VIN = 3.5V) VFWD and RFWD vs ILOAD
IOC vs Temperature (VIN = 3.5V) UVLO Thresholds vs Temperature RFWD vs VIN at ILOAD = 500mA
TEMPERATURE (°C)
–40
1
I
OC
(A)
2
3
4
0 40 80 120
4413 G04
TEMPERATURE (°C)
–40
2.05
2.10
2.20
80
4413 G05
2.00
1.95
0 40
120
1.90
1.85
2.15
UVLO (V)
UVLO TURN-ON
UVLO TURN-OFF
VIN (V)
2.5
0
R
FWD
(mΩ)
20
40
60
80
120
3.5 4.5
4413 G06
5.5
100 120°C
80°C
–40°C
0°C
40°C
TEMPERATURE (°C)
–60
R
FWD
(mΩ)
60
80
100
60
140
4413 G07
40
20
0–20 20 100
120
140
160
RFWD IOUT = 100mA
RFWD IOUT = 500mA
RFWD IOUT = 1A
IOUT (mA)
0 500 1500 25001000 2000
3000
0
V
FWD
(mV) AND R
FWD
(mΩ)
50
100
150
200
300
250
VFWD
RFWD
4413 G08
120°C
80°C
40°C
0°C
–40°C
IQF vs ILOAD IQF vs ILOAD IQF vs Temperature
ILOAD (A)
40
I
QF
(µA)
80
120
160
200
100E-6 10E-3 100E-3
10E+0
4413 G01
0
1E-3 1E+0
120°C
80°C
40°C
0°C
–40°C
ILOAD (A)
0
0
I
QF
(µA)
40
80
120
160
200
0.50 1 1.50 2
4413 G02
2.50
3
120°C
80°C
40°C
0°C
–40°C
TEMPERATURE (°C)
–40
I
QF
(µA)
40
60
120
4413 G03
20
0040 80
80
IQF AT 1A
IQF AT 100mA
LTC4413
5
4413fd
For more information www.linear.com/LTC4413
20µs/DIV 4413 G17
IN
200mV/DIV
OUT
200mV/DIV
IOUT
200mA/DIV
TEMPERATURE (°C)
–40
ENBA, ENBB THRESHOLD (mV)
450
500
550
VENBIH
VENBIL
120
4413 G13
400
350
300 040 80
TEMPERATURE (°C)
–40
0
ENBA, ENBB HYSTERESIS (mV)
20
40
60
80
100
120
0 40 80 120
4413 G14
TEMPERATURE (°C)
10E-9
–ILEAK (A)
100E-9
1E-6
10E-6
–40 40 80 120
1E-9
0
4413 G15
Typical perForMance characTerisTics
ENBA, ENBB Threshold vs
Temperature
ENBA, ENBB Hysteresis vs
Temperature
–ILEAK vs Temperature at
VREVERSE = 5.5V
Response to 800mA Load Step
in 80µs
ENBA, ENBB Turn-On, 240µs to
Recover with 180mA Load
ENBA, ENBB Turn-Off, 16µs to
Disconnect IN from 180mA Load
VFWD and RFWD vs ILOAD VFWD vs ILOAD (VIN = 3.5V)
ILOAD (mA)
1 10 100 1000
10000
0
V
FWD
(mV) AND R
FWD
(mΩ)
50
100
150
200
300
250
4413 G09
120°C
80°C
40°C
0°C
–40°C
VFWD
RFWD
ILOAD (mA)
50
V
FWD
(mV)
100
150
200
300
250
1 100 1000
10000
4413 G10
0
10
120°C
80°C
40°C
0°C
–40°C
100µs/DIV 4413 G11
INA, INB
1V/DIV
OUTA, OUTB
1V/DIV
IOUTA, IOUTB
500mA/DIV
ENBA, ENBB
1V/DIV
VOUTA, VOUTB
VENBA, VENBB
4µs/DIV
4413 G12
INA, INB
1V/DIV
OUTA, OUTB
1V/DIV
IOUTA, IOUTB
100mA/DIV
ENBA, ENBB
1V/DIV
LTC4413
6
4413fd
For more information www.linear.com/LTC4413
pin FuncTions
INA (Pin 1): Primary Ideal Diode Anode and Positive
Power Supply. Bypass INA with a ceramic capacitor of at
least 1µF. 1Ω snub resistors in series with a capacitor and
higher valued capacitances are recommended when large
inductances are in series with this input. Limit slew rate
on this pin to less than 0.5V/µs. This pin can be grounded
when not used.
ENBA (Pin 2): Enable Low for Diode A. Weak (3µA) pull-
down. Pull this pin high to shut down this power path.
Tie to GND to enable. Refer to Table 1 for mode control
functionality.
This pin can be left floating, weak pull-down
internal to the LTC4413.
GND (Pins 3, Exposed Pad Pin 11): Power and Signal
Ground for the IC. The exposed pad of the package, Pin 11,
must be soldered to PCB ground to provide both electrical
contact to ground and good thermal contact to the PCB.
ENBB (Pin 4): Enable Low for Diode B. Weak (3µA) pull-
down. Pull this pin high to shut down this
power path.
Tie to GND to enable. Refer to Table 1 for mode control
functionality. This pin can be left floating, weak pull-down
internal to the LTC4413.
INB (Pin 5): Secondary Ideal Diode Anode and Positive
Power Supply. Bypass INB with a ceramic capacitor of at
least 1µF. 1Ω snub resistors in series with a capacitor and
higher valued capacitances are recommended when large
inductances are in series with this input. Limit slew rate
on this pin to less than 0.5V/µs. This pin can be grounded
when not used.
OUTB (Pin 6): Secondary Ideal Diode Cathode and Output.
Bypass OUTB with a high (1mΩ min) ESR ceramic capacitor
of at least 4.7µF. Limit slew rate on this pin to less than
0.5V/µs. This pin must be left floating when not in use.
NC (Pin 7): No Internal Connection.
NC (Pin 8): No Internal Connection.
STAT (Pin 9): Status Condition Indicator. Weak (9µA)
pull-down current output. When terminated, STAT = high
indicates diode conducting.
The function of the STAT pin depends on the mode that
has been selected. Table 2 describes the STAT pin output
current as a function of the mode selected as well as the
conduction state of the two diodes. This pin can also be
left floating or grounded.
OUTA (Pin 10): Primary Ideal Diode Cathode and Output.
Bypass OUTA with a high (1mΩ min) ESR ceramic capacitor
of at least 4.7µF. Limit slew rate on this pin to less than
0.5V/µs. This pin must be left floating when not in use.
VREVERSE (V)
10E-9
–I
LEAK
(A)
100E-9
1E-6
10E-6
02435
1E-9
1
4413 G16
80°C
40°C
0°C
–40°C
LOAD CURRENT (A)
0.92
EFFICIENCY (%)
0.94
0.96
0.98
1.00
1.0E-3 100.0E-3 1.0E+0 10.0E+0
1351 G13
0.90
10.0E-3
ILOAD (mA)
1
0
POWER LOSS (mW)
100
200
300
400
500
600
500 1000 1500 2000
4413 G19
2500
1N5817 LTC4413
–ILEAK vs VREVERSE Efficiency vs Load Current Power Loss LTC4413 vs 1N5817
Typical perForMance characTerisTics
LTC4413
8
4413fd
For more information www.linear.com/LTC4413
operaTion
The LTC4413 is described with the aid of the Block Diagram
(Figure 1). Operation begins when the power source at
VINA or VINB rises above the undervoltage lockout (UVLO)
voltage of 2.4V and either of the ENBA or ENBB control
pins is low. If only the voltage at the VINA pin is present, the
power source to the LTC4413 (VDD) will be supplied from
the VINA pin. The amplifier (A) pulls a current proportional
to the difference between VINA and VOUTA from the gate
(VGATEA) of the internal PFET (PA), driving this gate voltage
below VINA. This turns on PA. As VOUTA is pulled up to
a forward voltage drop (VFWD) of 20mV below VINA, the
LTC4413 regulates VGATEA to maintain the small forward
voltage drop. The system is now in forward regulation and
the load at VOUTA is powered from the supply at VINA. As
the load current varies, VGATEA is controlled to maintain
VFWD until the load current exceeds the transistor’s (PA)
ability to deliver the current as VGATEA approaches GND.
At this point the PFET behaves as a fixed resistor with
resistance RON, whereby the forward voltage increases
slightly with increased load current. As the magnitude of
IOUT increases further (such that ILOAD > IOC), the LTC4413
fixes the load current to the constant value IOC to protect
the device. The characteristics for parameters RFWD,
RON, VFWD and IOC are specified with the aid of Figure 2,
illustrating the LTC4413 forward voltage drop versus that
of a Schottky diode.
If another supply is provided at VINB, the LTC4413 likewise
regulates the gate voltage on PB to maintain the output
voltage VOUTB just below the input voltage VINB. If this
alternate supply, VINB, exceeds the voltage at VINA, the
LTC4413 selects this input voltage as the internal supply
(VDD). This second ideal diode operates independently of
the first ideal diode function.
When an alternate power source is connected to the load
at VOUTA (or VOUTB), the LTC4413 senses the increased
voltage at VOUTA and amplifier A increases the voltage
VGATEA, reducing the current through PA. When VOUTA is
higher than VINA + VRTO, VGATEA is pulled up to VDD, which
turns off PA. The internal power source for the LTC4413
(VDD) is then diverted to source current from the VOUTA pin,
only if VOUTA is larger than VINB (or VOUTB). The system
is now in the reverse turn-off mode. Power to the load is
being delivered from an alternate supply and only a small
current is drawn from VINA to sense the potential at VINA.
When the selected channel of the LTC4413 is in reverse
turn-off mode or both channels are disabled, the STAT pin
sinks 9µA of current (ISON) if connected.
Channel selection is accomplished using the two ENB pins,
ENBA and ENBB. For example with channel A, when the
ENBA input is asserted (high), PA’s gate voltage is pulled
to VDD at a controlled rate, limiting the turn-off time to
avoid voltage spiking at the input when being driven by an
inductive source impedance. A 3µA pull-down current on
the ENBA, ENBB pins ensures a low level at these inputs
if left floating.
Slow Response Time
The LTC4413-1 (or LTC4413-2) is recommended for
applications with demanding load step or fast slew rate
requirements. The LTC4413-1 and LTC4413-2 provide bet-
ter load regulation in these environments at the expense
of higher quiescent current. The LTC4413 is optimized
for lower power consumption and should not be used in
high slew rate environments or when large and fast load
transients are anticipated.
Overcurrent and Short-Circuit Protection
During an overcurrent condition, the output voltage droops
as the load current exceeds the amount of current that
the LTC4413 can supply. At the time when an overcurrent
condition is first detected, the LTC4413 takes some time to
Figure 2
FORWARD VOLTAGE (V)
0
0
CURRENT (A)
IFWD
I
OC
SLOPE
1/RON
SLOPE
1/RFWD
LTC4413
SCHOTTKY
DIODE
4413 F02
LTC4413
9
4413fd
For more information www.linear.com/LTC4413
applicaTions inForMaTion
detect this condition before reducing the current to IMAX.
For short durations after the output is shorted, the
current may exceed IMAX. The magnitude of this peak
short-circuit current can be large, depending on the load
current immediately before the short circuit occurs. During
overcurrent operation, the power consumption of the
LTC4413 is large, and is likely to cause an overtemperature
condition as the internal die temperature exceeds the
thermal shutdown temperature.
Overtemperature Protection
The overtemperature condition is detected when the
internal die temperature increases beyond 150°C. An
overtemperature condition causes the gate amplifiers (A
and B) as well as the two P-channel MOSFETs (PA and
PB) to be shut off. When the internal die temperature
cools to below 140°C, the amplifiers turn on and revert
to normal operation. Note that prolonged operation under
overtemperature conditions degrades reliability.
Channel Selection and Status Output
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, the status signal indicates
this condition with a low voltage.
Table 1. Mode Control
ENBA ENBB STATE
Low Low Diode OR (NB: The Two Outputs Are Not Connected
Internal to the Device)
Low High Diode A = Enabled, Diode B = Disabled
High Low Diode A = Disabled, Diode B = Enabled
High High All 0ff (Low Power Standby)
The function of the STAT pin depends on the mode that
has been selected. The following table describes the STAT
pin output current as a function of the mode selected, as
well as the conduction state of the two diodes.
Table 2. STAT Output Pin Funtion
ENBA ENBB CONDITIONS STAT
Low Low Diode A Forward Bias,
Diode B Forward Bias
ISNK = 0µA
Diode A Forward Bias,
Diode B Reverse Bias
ISNK = 0µA
Diode A Reverse Bias,
Diode B Forward Bias
ISNK = 9µA
Diode A Reverse Bias,
Diode B Reverse Bias
ISNK = 9µA
Low High Diode A Forward Bias,
Diode B Disabled
ISNK = 0µA
Diode A Reverse Bias,
Diode B Disabled
ISNK = 9µA
High Low Diode A Disabled,
Diode B Forward Bias
ISNK = 0µA
Diode A Disabled
Diode B Reverse Bias
ISNK = 9µA
High High Diode A Disabled,
Diode B Disabled
ISNK = 9µA
Introduction
The LTC4413 is intended for power control applications
that include low loss diode ORing, fully automatic
switchover from a primary to an auxiliary source of power,
microcontroller controlled switchover from a primary to
an auxiliary source of power, load sharing between two or
more batteries, charging of multiple batteries from a single
charger and high side power switching. The LTC4413 is
optimized for low quiescent power consumption at the
expense of transient response. For more demanding slew
rate or load transient applications, the pin compatible
LTC4413-1 is recommended.
Dual Battery Load Sharing with Automatic Switchover
to a Wall Adapter
An application circuit for dual battery load sharing with
automatic switchover of load from batteries to a wall adapter
is shown in Figure 3. When the wall adapter is not present,
whichever battery that has the higher voltage provides the
load current until it has discharged to the voltage of the
other battery. The load is then shared between the two
operaTion
LTC4413
10
4413fd
For more information www.linear.com/LTC4413
Figure 5
Figure 3
Figure 4
microcontroller’s analog inputs (perhaps with the aid of a
resistor voltage divider) monitors each supply input and
the LTC4413 status, and then commands the LTC4413
through the two ENBA/ENBB control inputs.
Automatic Switchover from a Battery to an Auxiliary
Supply or a Wall Adapter
Figure 5 illustrates an application for implementing the
function of automatic switchover from a battery to either
an auxiliary supply or to a wall adapter using the LTC4413.
The LTC4413 automatically senses the presence of a wall
adapter as the ENBB pin voltage is pulled higher than its
rising turn-off threshold of 550mV through resistive divider
(R2 and R3). This disables the AUX input from powering
the load. If the AUX is not present when a wall adapter is
attached (i.e., the BAT is supplying load current), as the
wall adapter voltage rises, the body diode in MP1 forward
biases, pulling the output voltage above the BAT voltage.
The LTC4413 senses a reverse voltage of as little as 10mV
and turns off the ideal diode between INA and OUTA. This
causes the STAT voltage to fall, turning on MP1. The load
then draws current from the wall adapter, and the battery is
disconnected from the load. If the AUX is not present when
the wall adapter is removed, the load voltage droops until
the BAT voltage exceeds the load voltage. The LTC4413
senses that the BAT voltage is greater, causing the STAT
voltage to rise, disabling MP1; the BAT then provides
power to the load.
batteries according to the capacity of each battery. The
higher capacity battery provides proportionally higher
current to the load. When a wall adapter input is applied,
the voltage divider formed by R1 and R2 disables the
LTC4413, causing the STAT pin voltage to fall, turning on
MP1. At this point the load is powered by the wall adapter
and both batteries may be removed without interrupting
the load voltage. When the wall adapter is removed, the
output voltage droops until the voltage divider turns on the
LTC4413, at which point the batteries revert to providing
load power. The status signal can also be used to provide
information as to whether the wall adapter (or BATB) is
supplying the load current.
Automatic PowerPath Control
Figure 4 illustrates an application circuit for microcon-
troller monitoring and control of two power sources. The
applicaTions inForMaTion
LTC4413
IDEAL
ENBA
2
4
3,11
1
5
10
9
6
ENBB STAT
GND
INA OUTA
BATA
1-CELL Li-Ion
R1
1000k
R2
200k
RSTAT
470k
C1:C1206C106K8PAC
C2:C1206C475K8PAC
C2
4.7µF
4413 F03
TO
LOAD
WALL
ADAPTER
C1
10µF
MP1 FDR8508
IDEAL
INB OUTB
BATB
1-CELL Li-Ion
LTC4413
IDEAL
ENBA
2
4
3,11
1
5
10
9
6
ENBB STAT
STAT
GND
INA OUTA
RSTAT
470k
C1
4.7µF
4413 F04
TO
LOAD
PRIMARY
POWER
AUX
POWER
IDEAL
INB OUTB
CA
10µF
CB
10µF
MICROCONTROLLER
LTC4413
IDEAL
ENBB
4
ENBA
2
3,11
1
5
10
9
6
STAT
GND
INA OUTA
R2
1000k
R3
100k
BAT
RSTAT
470k
C1:C0805C106K8PAC
C2:C1206C475K8PAC
C2
4.7µF
4413 F05
TO
LOAD
WALL
ADAPTER
AUX
ADAPTER
R4
1000k
R5
500k
R1
1Ω
C1
10µF
MP1 FDR8508
IDEAL
INB OUTB
LTC4413
11
4413fd
For more information www.linear.com/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
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.
LTC4413
IDEAL
ENBA
2
4
3,11
1
5
10
9
6
ENBB
STAT
GND
INA OUTA
470k
4413 F06
LOAD1
STAT IS HIGH
WHEN BAT1
IS CHARGING
BAT1
BATTERY
CHARGER
INPUT IDEAL
INB OUTB LOAD2
BAT2
LTC4413
12
4413fd
For more information www.linear.com/LTC4413
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
3.00 ±0.10
(4 SIDES)
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
0.40 ±0.10
BOTTOM VIEW—EXPOSED PAD
1.65 ±0.10
(2 SIDES)
0.75 ±0.05
R = 0.125
TYP
2.38 ±0.10
(2 SIDES)
15
106
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.00 – 0.05
(DD) DFN REV C 0310
0.25 ±0.05
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.65 ±0.05
(2 SIDES)2.15 ±0.05
0.50
BSC
0.70 ±0.05
3.55
±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.50 BSC
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
LTC4413
13
4413fd
For more information www.linear.com/LTC4413
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
revision hisTory
REV DATE DESCRIPTION PAGE NUMBER
D 07/15 Changed VENB to VENBA,B in electrical characteristics
Changed ENB to ENBA,B IN to INA,B and OUT to OUTA,B on plots 3 to 7
Added exposed pad to GND Pin Function label
Added sentence to paragraph prior to Slow Response section and added A,B references
Changed ENBA and ENBB on Tables 1 and 2
Added LTC4415 to Related Parts table
3
5
6
8
9
12
(Revision history begins at Rev D)
LTC4413
14
4413fd
For more information www.linear.com/LTC4413
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
LINEAR TECHNOLOGY CORPORATION 2004
LT 0715 REV D • PRINTED IN USA
relaTeD parTs
PART NUMBER DESCRIPTION COMMENTS
LTC1558/LTC1559 Backup Battery Controller with Programmable
Output
Adjustable Backup Voltage from 1.2V NiCd Button Cell, Includes Boost Converter
LTC1998 2.5µA, 1% Accurate Programmable Battery
Detector
Adjustable Trip Voltage/Hysteresis, ThinSOT™
LTC4054 800mA Standalone Linear Li-Ion Battery
Charger with Thermal Regulation in ThinSOT
No External MOSFET, Sense Resistor or Blocking Diode Required, Charge
Current Monitor for Gas Gauging, C/10 Charge Termination
LTC4055 USB Power Controller and Li-Ion Charger Automatic Switchover, Charges 1-Cell Li-Ion Batteries
L
TC4085 USB Power Manager with Ideal Diode
Controller and Li-Ion Charger
Charges Single Cell Li-Ion Batteries Directly from a USB Port, Thermal
Regulation, 200mΩ Ideal Diode with <50mΩ Option, 4mm × 3mm 14-Lead
DFN Package
LTC4350 Hot Swappable Load Share Controller Allows N + 1 Redundant Supply, Equally Loads Multiple Power Supplies
Connected in Parallel
L
T4351 MOSFET Diode-OR Controller 1.2V to 18V Input, Internal Boost Regulator for Driving N-Channel MOSFET
LTC4411 2.6A Low Loss Ideal Diode in ThinSOT
Load Sharing
No External MOSFET, Automatic Switching Between DC Sources, Simplified
LTC4412/L
TC4412HV PowerPath Controllers in ThinSOT More Efficient than Diode ORing, Automatic Switching Between DC Sources,
Simplified Load Sharing, 3V ≤ VIN ≤ 28V (3V ≤ VIN ≤ 36V for HV)
LTC4413-1/LTC4413-2 Dual 2.6A, 2.5V to 5.5V Fast Ideal Diodes in
3mm × 3mm DFN
Fast Pin Compatible Replacement for the LTC4413 (LTC4413-2 with
Overvoltage Protection)
LTC4415 Dual 4A Ideal Diodes with Adjustable Current
Limit
Dual P-Channel 50mΩ Ideal Diodes, 1.7V to 5.5V Input, 15mV Forward Drop,
MSOP-16 and 3mm × 5mm DFN-16 Packages
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC4413
Figure 7
LTC4413
IDEAL
ENBA
2
4
3,11
1
5
10
9
6
ENBB
STAT
GND
INA OUTA
R1
560k
4413 F07
R2
100k
1-CELL
Li-Ion
IDEAL
INB OUTB
TO LOAD
C2
4.7µF
C1
10µF
C1: C0805C106K8PAC
C2: C1206C475K8PAC
VCC
ENB
Li CC
LTC4059
PROG
WALL
ADAPTER
BAT
GND
Typical applicaTions
