LTC4413-1/LTC4413-2
Dual 2.6A, 2.5V to 5.5V
Fast Ideal Diodes
in 3mm × 3mm DFN
Description
Features
2-Channel Ideal Diode OR’ing or Load Sharing
n Low Loss Replacement for PowerPath™ OR’ing
Diodes
n Fast Response Replacement for LTC4413
n Low Forward On-Resistance (140mΩ Max at 3.6V)
n Low Reverse Leakage Current
n Low Regulated Forward Voltage (18mV Typ)
n Overvoltage Protection Sensor with Drive Output for
an External P-Channel MOSFET (LTC4413-2 Only)
n 2.5V to 5.5V Operating Range
n 2.6A Maximum Forward Current
n Internal Current Limit Protection
n Internal Thermal Protection
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
Applications
Battery and Wall Adapter Diode OR’ing in Handheld
Products
n Backup Battery Diode OR’ing
n Power Switching
n USB Peripherals
n Uninterruptable Supplies
n
The LTC®4413-1 and LTC4413-2 each contain two monolithic ideal diodes, each capable of supplying up to 2.6A
from input voltages between 2.5V and 5.5V. The ideal
diodes use a 100mΩ P-channel MOSFET to independently
connect INA to OUTA and INB to OUTB. During normal
forward operation, the voltage drops across each of
these diodes are regulated to as low as 18mV. Quiescent
current is less than 80µA for diode currents up to 1A. If
either of the output voltages exceeds its respective input
voltage, that MOSFET is turned off and less than 1µA of
reverse current flows 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. An internal overvoltage protection sensor
detects when a voltage exceeds the LTC4413-2 absolute
maximum voltage tolerance.
Two active-high control pins independently turn off the two
ideal diodes contained within the LTC4413-1/LTC4413‑2.
When the selected channel is reverse biased, or the
LTC4413-1/LTC4413-2 is put into low power standby, the
status signal is pulled low by an 11µA open drain.
The LTC4413-1/LTC4413-2 are housed in a 10-lead 3mm
× 3mm DFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and PowerPath are trademarks of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
Typical Application
Power Loss vs Load
Automatic Switchover from a Battery to a Wall Adapter
OUTA
INA
10µF
0.1µF
1Ω
BAT
+
VCC
600
470k
IDEAL
ENBA
STAT
LTC4413-2
OVI
GND
STAT
OVP
OVP
OUTB
ENBB
INB
TO LOAD
4.7µF
IDEAL
441312 TA01a
STAT IS HIGH WHEN WALL ADAPTER IS
SUPPLYING LOAD CURRENT
OVP IS HIGH WHEN WALL ADAPTER VOLTAGE > 6V
POWER LOSS (mW)
FDR8508
WALL
ADAPTER
INPUT
700
500
LTC4413-1
400
300
1N5817
200
100
0
0
500
1000 1500 2000
LOAD (mA)
2500
3000
441312 TA01b
441312fg
For more information www.linear.com/LTC4413-1
1
LTC4413-1/LTC4413-2
Absolute Maximum Ratings
(Note 1)
INA, INB, OUTA, OUTB, STAT,
ENBA, ENBB Voltage..................................... –0.3V to 6V
OVI, OVP Voltage.........................................–0.3V to 13V
Operating Temperature Range..................–40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Continuous Power Dissipation...........................1500mW
(Derate 25mW/°C Above 70°C)
Pin Configuration
LTC4413-1
LTC4413-2
TOP VIEW
TOP VIEW
INA
1
10 OUTA
INA
1
ENBA
2
9 STAT
ENBA
2
GND
3
8 NC
GND
3
ENBB
4
7 NC
ENBB
4
7 OVP
INB
5
6 OUTB
INB
5
6 OUTB
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS SGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
10 OUTA
9 STAT
11
8 OVI
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS SGND, MUST BE SOLDERED TO PCB
http://www.linear.com/product/LTC4413-1#orderinfo
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4413EDD-1#PBF
LTC4413EDD-1#TRPBF
LCPP
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC4413EDD-2#PBF
LTC4413EDD-2#TRPBF
LCPQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4413EDD-1
LTC4413EDD-1#TR
LCPP
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC4413EDD-2
LTC4413EDD-2#TR
LCPQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
441312fg
2
For more information www.linear.com/LTC4413-1
LTC4413-1/LTC4413-2
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
VIN, VOUT
Operating Supply Range for Channel A
or B
VIN and/or VOUT Must be in This Range for Proper
Operation
l
MIN
UVLO
UVLO Turn-On Rising Threshold
Max (VINA, VINB, VOUTA, VOUTB)
l
UVLO Turn-Off Falling Threshold
Max (VINA, VINB, VOUTA, VOUTB)
l
IQF
Quiescent Current in Forward Regulation, VINA = 3.6V, IINA = 100mA, VINB = 0V,
Measured via GND
IINB = 0mA (Note 3)
l
IQRIN
Current Drawn from or Sourced into IN
When VOUT is Greater than VIN
VIN = 3.6V, VOUT = 5.5V (Note 6)
l
IQRGND
Quiescent Current While in Reverse
Turn-Off, Measured via GND
VINA = VINB = 0V, VOUTB = VOUTA = 5.5V,
VSTAT = 0V
IQROUTB
Quiescent Current While in Reverse
Turn-Off. Current Drawn from VOUTA
When OUTB Supplies Chip Power
VINA = VINB = 0V, VOUTA = 3.6V, VOUTB = 5.5V
IQOFF
Quiescent Current with Both ENBA and
ENBB High
VRTO
TYP
2.5
MAX
UNITS
5.5
V
2.45
V
1.7
V
40
58
µA
2.5
4.5
µA
28
36
µA
l
3.5
6.5
µA
VINA = VINB = 3.6V, VENBA = VENBB = 1V
l
28
38
µA
Reverse Turn-Off Voltage (VOUT – VIN)
VIN = 3.6V
l
10
mV
VFWD
Forward Voltage Drop (VIN – VOUT)
at IOUT = –1mA
VIN = 3.6V
l
18
24
mV
RFWD
On-Resistance, RFWD Regulation
(Measured as ΔV/ΔI)
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, IIN = 1A (Note 5)
140
200
mΩ
tON
PowerPath Turn-On Time
VIN = 3.6V, from ENBA, ENBB Falling to IOUT Ramp
Starting
11
µs
tOFF
PowerPath Turn-Off Time
VIN = 3.6V, from ENBA, ENBB Rising with IIN =
100mA Falling to 0mA
2
µs
–1
–5
Short-Circuit Response
IOC
Current Limit
VINA OR B = 3.6V (Note 5)
1.8
A
IQOC
Quiescent Current While in Overcurrent
Operation
VINA OR B = 3.6V, IOUT = 1.8A (Note 5)
ISOFF
STAT Off Current
Shut Down
l
ISON
STAT Sink Current
VIN > VOUT, VENB > VENBIH, TJ < 135°C, IOUT < IMAX
l
tS(ON)
STAT Pin Current Turn-On Time
VIN = 3.6V, from ENBA, ENBB Falling
1.8
µs
tS(OFF)
STAT Pin Current Turn-Off Time
VIN = 3.6V, from ENBA, ENBB Rising
0.8
µs
VENBIH
ENB Inputs Rising Threshold Voltage
VENBA, VENBB Rising
l
VENBIL
ENB Inputs Falling Threshold Voltage
VENBA, VENBB Falling
l
VENBHYST
ENB Input Hysteresis
VENBHYST = (VENBIH – VENBIL)
IENB
ENB Inputs Pull-Down Current
VOUT < VIN = 3.6V, VENBA < VENBIL, VENBB < VENBIL
100
130
µA
–1
0
1
µA
7
11
15
µA
STAT Output
ENB Inputs
l
540
400
2
600
mV
460
mV
90
mV
3
4
µA
441312fg
For more information www.linear.com/LTC4413-1
3
LTC4413-1/LTC4413-2
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
5.9
6.2
UNITS
OVI Input (LTC4413-2 Only)
VOVIH
OVI Input Rising Threshold Voltage
VOVI Rising
VOVIL
OVI Input Falling Threshold Voltage
VOVI Falling
VOVID
OVI-OVP Voltage Drop
IOVI
OVI Bias Current
5.6
V
VOVI = 8V, No Load at OVP
100
mV
VOVI = 8V
80
µA
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 LTC4413-1/LTC4413-2 are 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.
5.4
V
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: 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.
441312fg
4
For more information www.linear.com/LTC4413-1
LTC4413-1/LTC4413-2
Typical Performance Characteristics
IQF vs ILOAD (Log)
120
120°C
120
80°C
40°C
40°C
0°C
–40°C
60
1A
80
–40°C
60
40
40
20
20
20
10
1
100
LOAD (mA)
0
10000
1000
0
1000 1500 2000
LOAD (mA)
500
2500
441312 G01
2.20
3000
2.15
2500
IOC (mA)
2000
40
30
1500
1000
20
500
10
2
2.5
3
3.5
4
4.5
5
5.5
0
VIN (V)
40
80
120
1.85
–40
ENBIH/ENBIL (mV)
100
50
ENBIH
ENBIL
400
300
200
441312 G07
0
–40
120
ENBA, ENBB Hysteresis vs
Temperature
100
100 120
80
120
500
200
150
40
441312 G06
600
20 40
60 80
TEMPERATURE (°C)
0
TEMPERATURE (°C)
ENBA, ENBB Thresholds vs
Temperature
250
0
FALLING
1.95
441312 G05
UVLO Hysteresis vs Temperature
UVLO HYSTERESIS (mV)
2.00
TEMPERATURE (°C)
441312 G04
0
–40 –20
2.05
1.90
0
–40
6
120
RISING
2.10
ENBA, ENBB HYSETERSIS (mV)
0
40
80
TEMPERATURE (°C)
UVLO Thresholds vs Temperature
3500
60
IQF = 100mA
0
441312 G03
UVLO THRESHOLDS (V)
IQF = 1A
50
1mA
0
–40
3000
IOC vs Temperature
IQF vs VIN
70
100mA
441312 G02
90
80
500mA
60
40
0
IQF (µA)
100
0°C
80
IQF (µA)
IQF (µA)
80
IQF vs Temperature
120°C
100
80°C
100
IQF vs ILOAD (Linear)
IQF (µA)
120
0
40
80
TEMPERATURE (°C)
120
441312 G08
100
80
60
40
20
0
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
100 120
441312 G09
441312fg
For more information www.linear.com/LTC4413-1
5
LTC4413-1/LTC4413-2
Typical Performance Characteristics
RFWD vs VIN and ILOAD = 500mA
500
VFWD and RFWD vs ILOAD (Linear)
120°C
80°C
40°C
0°C
–40°C
78
76
400
RFWD (mΩ)
68
VFWD
400
300
150
200
100
RFWD
64
100
50
62
2
2.5
3
3.5
4
4.5
VIN (V)
5
5.5
6
0
0
500
1000 1500 2000
LOAD (mA)
2500
200
100
100
50
10
1
100
LOAD (mA)
1
100
80
100
1A
60
ILEAK vs Temperature at
VREVERSE = 5.5V
0.1
100mA
150
0
10000
1000
441312 G12
120
120°C
80°C
40°C
0°C
–40°C
RFWD (mΩ)
VFWD (mV)
150
RFWD vs Temperature
VFWD vs ILOAD (Log)
200
200
VFWD
300
0
0
3000
250
441312 G11
441312 G10
250
RFWD
500mA
ILEAK (µA)
60
300
120°C
80°C
40°C
0°C
–40°C
500
200
66
RFWD and VFWD vs ILOAD (Log)
VFWD (mV)
70
600
VFWD (mV)
RFWD 500mA (mΩ)
74
72
250
RFWD (mΩ)
80
5.5V
0.01
3.6V
0.001
40
50
0
0.0001
20
10
1
100
LOAD (mA)
1000
10000
0
–40
0
40
80
TEMPERATURE (°C)
441312 G13
100
120°C
80°C
40°C
0°C
–40°C
ILEAK (µA)
1
0.00001
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
CH1 = IN 100mV/DIV
ENBA, ENBB Turn-On, 30µs to
Turn On with 180mA Load
CH1 INA, INB 1V/DIV
CH2 OUT
100mV/DIV
100 120
441312 G15
441312 G14
Response to 800mA Load Step
in IOC) the LTC4413-1/LTC4413-2 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 1, illustrating the
LTC4413-1/LTC4413-2 forward voltage drop versus that
of a Schottky.
If another supply is provided at VINB, the LTC4413-1/
LTC4413-2 likewise regulate the gate voltage on PB to
IOC
maintain the output voltage, VOUTB, just below the input
voltage VINB. If this alternate supply, VINB, exceeds the
voltage at VINA, the LTC4413-1/LTC4413-2 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 LTC4413-1/LTC4413-2 sense 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 will be pulled up
to VDD, turning off PA. The internal power source for the
LTC4413-1/LTC4413-2 (VDD) then diverts to draw 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 (ILEAK) is drawn from or
sourced to VINA to sense the potential at VINA.
When the selected channel of the LTC4413-1/LTC4413-2
is in reverse turn-off mode or both channels are disabled,
the STAT pin sinks 11µA of current (ISON) if connected.
Channel selection is accomplished using the two pins,
ENBA and ENBB. For example with channel A, when the
ENBA input is asserted (high), PA has its gate voltage
pulled to VDD, turning off PA. A 3.5µA pull-down current
on the ENBA, ENBB pins ensures a low level at these
inputs if left floating.
LTC4413-1
LTC4413-2
CURRENT (A)
SLOPE: 1/RON
IFWD
1N5817
SLOPE: 1/RFWD
0
0 VFWD
FORWARD VOLTAGE (V)
441312 F01
Figure 1. The LTC4413 vs the 1N5817
441312fg
10
For more information www.linear.com/LTC4413-1
LTC4413-1/LTC4413-2
Operation
Overcurrent and Short-Circuit Protection
During an overcurrent condition, the output voltage droops
as the load current exceeds the amount of current that the
LTC4413-1/LTC4413-2 can supply. At the time when an
overcurrent condition is first detected, the LTC4413‑1/
LTC4413-2 take some time to detect this condition before
reducing the current to IOC. For short durations after the
output is shorted, until TOC, the current may exceed IOC.
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 LTC4413-1/LTC4413-2 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 will cause the gate amplifiers
(A and B) as well as the two P-channel MOSFETs (PA
and PB) to shut off. When the internal die temperature
cools to below 140°C, the amplifiers turn on and the
LTC4413‑1/LTC4413-2 reverts to normal operation. Note
that prolonged operation under overtemperature conditions
degrades reliability.
Protection for more information on using the overvoltage
protection function within the LTC4413-2.
Channel Selection and Status Output
Two active-high control pins independently turn off the two
ideal diodes contained within the LTC4413-1/LTC4413-2,
controlling the operation mode as described by Table 1.
When the selected channel is reverse biased, or the
LTC4413-1/LTC4413-2 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 Off (Low Power Standby)
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.
Table 2. STAT Output Pin Function
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 = 11µA
Diode A Reverse Bias,
Diode B Reverse Bias
ISNK = 11µA
Diode A Forward Bias,
Diode B Disabled
ISNK = 0µA
Diode A Reverse Bias,
Diode B Disabled
ISNK = 11µA
Diode A Disabled,
Diode B Forward Bias
ISNK = 0µA
Diode A Disabled,
Diode B Reverse Bias
ISNK = 11µA
Diode A Disabled,
Diode B Disabled
ISNK = 11µA
Overvoltage Protection (LTC4413-2 Only)
An overvoltage condition is detected whenever the overvoltage input (OVI) pin is pulled above 6V. The condition
persists until the OVI voltage falls below 5.6V. The overvoltage protection (OVP) output is low unless an overvoltage
condition is detected. If an overvoltage condition is present,
the OVP output is pulled up to the voltage applied to the
OVI input. This output signal can be used to enable or
disable an external PFET that is placed between the input
that is the source of the excessive voltage and the input to
the LTC4413-2, thus eliminating the potential damage that
may occur to the LTC4413-2 if its input voltage exceeds
the absolute maximum voltage of 6V. See the Applications Information section Dual Battery Load Sharing with
Automatic Switchover to a Wall Adapter with Overvoltage
Low
High
High
High
Low
High
441312fg
For more information www.linear.com/LTC4413-1
11
LTC4413-1/LTC4413-2
Applications Information
Introduction
The LTC4413-1/LTC4413-2 are intended for power control
applications that include low loss diode OR’ing, 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.
Dual Battery Load Sharing with Automatic Switchover
to a Wall Adapter with Overvoltage Protection
(LTC4413-2 Only)
An application circuit for dual battery load sharing with
automatic switchover of load from batteries to a wall
adapter is shown in Figure 2. When the wall adapter is not
present, whichever battery has the higher voltage provides
the load current until it has discharged to the voltage of the
other battery. The load is shared between the two 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 output
voltage rises as the body diode in MP2 conducts. When
the output voltage is larger than the battery voltages, the
LTC4413 turns off and very little load current is drawn
from the batteries. At this time, the STAT pin pulls down
MP1
MP2
IRLML6402 IRLML6402
WALL
ADAPTER
INPUT
JACK
BATA
+
BATB
+
C1
0.10µF
R1
1Ω
C2
10nF
OUTA 10
1 INA
TO LOAD
2
10nF
RSTAT
470k
441312 F02
COUT
4.7µF
IDEAL
Capacitor C2 is required to dynamically pull up on the
gate of PFET MP1 if a fast edge occurs at the wall adapter
input during a hot plug. In the event that capacitor C2 (or
the gate-to-source of MP1) is precharged below the OVI
rising threshold. When a high voltage spike occurs, the
OVP output cannot guarantee turning off MP1 before the
load voltage exceeds the absolute maximum voltage for
the LTC4413-2. This may occur in the event that the wall
adapter suddenly steps from 5.5V to a much higher value.
In this case, a Zener diode is recommended to keep the
output voltage to a safe level.
Automatic PowerPath Control
Figure 3 illustrates an application circuit for microcontroller monitoring and control of two power sources. The
microcontroller’s analog inputs (perhaps with the aid of
a resistor voltage divider) monitor each supply input and
the LTC4413-1 status, and then commands the LTC4413-1
through the two ENBA/ENBB control inputs.
RSTAT
470k
MICROCONTROLLER
OPTIONAL
6.2V
DFLZ6V2-7
IDEAL
9
STAT
ENBA
LTC4413-2
3
8
OVI
GND
4
7
OVP
ENBB
OUTB 6
5 INB
the gate voltage of MP2, causing it to conduct. This status
signal can be used to provide information as to whether
the wall adapter (or BATB) is supplying the load current.
If the wall adapter voltage exceeds the OVI trip threshold
(VOVIH) then the wall adapter is disconnected via the
external PFET, MP1. The OVI voltage can be monitored
(through a voltage divider if necessary) to determine if
an overvoltage condition is present.
PRIMARY
POWER
SOURCE
RA
1Ω
STAT
OVP
C1: C1206C106K8PAC
C2: C0403C103K8PAC
COUT: C1206C475K8PAC
2
3
4
AUXILIARY
POWER
SOURCE
OUTA 10
1 INA
CA
10µF
IDEAL
ENBA
STAT
LTC4413-1
GND
ENBB
5 INB
CB
10µF
LOAD
STAT
OUTB 6
C1
4.7µF
IDEAL
441312 F03
RB
1Ω
Figure 2
9
Figure 3
441312fg
12
For more information www.linear.com/LTC4413-1
LTC4413-1/LTC4413-2
Applications Information
Automatic Switchover from a Battery to an Auxiliary
Supply, or a Wall Adapter with Overvoltage Protection
Figure 4 illustrates an application circuit where the
LTC4413-2 is used to automatically switch over between
a battery, an auxiliary power supply and a wall adapter.
When the battery is supplying load current, OVP is at GND
and STAT is high. If a higher supply is applied to AUX, the
BAT will be disconnected from the load and the load is
powered from AUX. When a wall adapter is applied, the
body diode of MP2 forward biases. When the load voltage
exceeds the AUX (or BAT) voltage, the LTC4413-2 senses
this higher voltage and disconnects AUX (or BAT) from
the load. At the same time it pulls the STAT voltage to
GND, thereby turning on MP2. The load current is now
supplied from the wall adapter. If the wall adapter voltage
exceeds the OVI rising threshold, the OVP voltage rises
and turns off MP1, disconnecting the wall adapter from
the load. The output voltage collapses down to the AUX
(or BAT) voltage and the LTC4413-2 reconnects the load
to AUX (or BAT).
MP1
MP2
IRLML6402 IRLML6402
WALL
ADAPTER
INPUT
JACK
+
BAT
C1
0.10µF
R1
1Ω
OUTA 10
1 INA
3
4
GND
IDEAL
470k
470k
2
OVI
OPTIONAL
6.2V
DFLZ6V2-7
TO LOAD
8
LTC4413-2
7
OVP
ENBB
9
STAT
OVP
OUTB 6
10nF
5 INB
AUX
C2
10nF
IDEAL
COUT
4.7µF
ENBA
441312 F04
RSTAT
560k
STAT
Capacitor C2 is required to dynamically pull up on the
gate of MP1 if a fast edge occurs at the wall adapter input
during a hot plug. If the wall adapter voltage is precharged
when an overvoltage spike occurs, the OVP voltage may
not discharge capacitor C2 in time to protect the output.
In this event, a Zener diode is recommended to protect
the output node until MP1 is turned off.
Multiple Battery Charging
Figure 5 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 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 15mV. This concept can apply to more than
two batteries. The STAT pin provides information as to
when the battery at OUTA is being charged. For intelligent
control, the ENBA/ENBB input pins can be used with a
microcontroller as shown in Figure 3.
BATTERY
CHARGER
INPUT
OUTA 10
1 INA
2
IDEAL
ENBA
LTC4413-1
3
9
STAT
GND
4
ENBB
OUTB 6
5 INB
IDEAL
LOAD
BAT1
470k STAT IS HIGH
WHEN BAT1 IS
CHARGING
+
C1: C1206C106K8PAC
C2: C0403C103K8PAC
COUT: C1206C475K8PAC
Figure 4
+
VCC
LOAD
BAT2
441312 F05
Figure 5
441312fg
For more information www.linear.com/LTC4413-1
13
LTC4413-1/LTC4413-2
Applications Information
Automatic Switchover from a Battery to a Wall
Adapter and Charger with Overvoltage Protection
Figure 6 illustrates the LTC4413-2 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 LTC4413‑2 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 MP1 (but below the OVI
threshold), the load voltage rises as the second ideal diode conducts. As soon as the OUTA voltage exceeds the
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 a high voltage
wall adapter is inadvertently attached above the OVI rising
threshold, the OVP pin voltage rises, disconnecting both
the LTC4413-2 and the LTC4059 from potentially hazardous voltages. When this occurs, the load voltage collapses
until it is below the BAT voltage causing the STAT voltage
to rise, disabling the battery charger. At the same time,
the LTC4413-2 automatically reconnects the battery to the
load. 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.
Capacitor C2 is required to dynamically pull up on the
gate of MP1 if a fast edge occurs at the wall adapter input
during a hot plug. If the wall adapter voltage is precharged
when an overvoltage spike occurs, the OVP voltage may
not discharge capacitor C2 in time to protect the output.
In this event, a Zener diode is recommended to protect
the output node until MP1 is turned off.
STAT
STAT
ENB
LTC4059
VCC PROG
MP1
IRLML6402
WALL
ADAPTER
INPUT
JACK
1µF
Li-Ion
+
100k
Li/CC GND
C1
10µF
OUTA 10
1 INA
BAT
9
RSTAT
560k
IDEAL
ENBA
LTC4413-2
4
ENBB
3
GND
OUTB 6
5 INB
TO
LOAD
2
D1
OPTIONAL
DFLZ6V2-7
COUT
4.7µF
IDEAL
OVP
C2
10nF
OVI
441312 F06
Figure 6
441312fg
14
For more information www.linear.com/LTC4413-1
LTC4413-1/LTC4413-2
Applications Information
Soft-Start Overvoltage Protection
an overvoltage event. When the overvoltage condition
ends, the OVP voltage drops slowly, depending on the
gate charge of the external PFET. This causes the external
PFET to linger in a high RDS(ON) region where it can dissipate a significant amount of heat depending on the load
current. To avoid dissipating heat in the external PFET, this
application delays turning on the ideal diode from INA to
OUTA, until the gate voltage of the external PFET drops
below VENBIL, where the external PFET should safely be
out of the high RDS(ON) region. This soft-start scheme can
be used on either channel of the LTC4413-2.
In the event that a low power external PFET is used for
the external overvoltage protection device, care must be
taken to limit the power dissipation in the external PFET.
The operation of this circuit is identical to the “Automatic
Switchover from a Battery to a Wall Adapter” application
shown on the first page of this data sheet. Here, however,
the ideal diode from INA to INB is disabled by pulling up
on ENBA whenever an overvoltage condition is detected.
This channel is turned-off using a resistor connected to
OVP along with a 5.6V Zener diode, ensuring the absolute maximum voltage at ENBA is not exceeded during
FDR8508
WALL
ADAPTER
INPUT
INA
C1
10µF
C2
10nF
0.1µF
D1
OPTIONAL
OUTA
IDEAL
VCC
RSTAT
470k
RENBA
560k
D2
5.6V
1Ω
BAT
+
ENBA
STAT
LTC4413-2
OVI
GND
STAT
OVP
OUTB
OVP
ENBB
INB
COUT
4.7µF
IDEAL
TO LOAD
441312 F07
C1: C0805C106K8PAC
C2: C0403C103K8PAC
COUT: C1206C475K8PAC
STAT IS HIGH WHEN WALL ADAPTER IS
SUPPLYING LOAD CURRENT
OVP IS HIGH WHEN WALL ADAPTER
VOLTAGE > 6V
Figure 7
441312fg
For more information www.linear.com/LTC4413-1
15
LTC4413-1/LTC4413-2
Package Description
Please refer to http://www.linear.com/product/LTC4413-1#packaging for the most recent package drawings.
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
0.70 ±0.05
3.55 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ±0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
3.00 ±0.10
(4 SIDES)
R = 0.125
TYP
6
0.40 ±0.10
10
1.65 ±0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.75 ±0.05
0.00 – 0.05
5
1
(DD) DFN REV C 0310
0.25 ±0.05
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
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
441312fg
16
For more information www.linear.com/LTC4413-1
LTC4413-1/LTC4413-2
Revision History
(Revision history begins at Rev E)
REV
DATE
DESCRIPTION
E
07/15
Changed GND to SGND in Pin Configuration
PAGE NUMBER
2
Changed VENB to VENBA,B in electrical characteristics
3
Changed ENB to ENBA,B last two plots
4
Changed ENB to ENBA,B last plot
5
Changed ENB to ENBA,B first plot and changed IN to INA,B
6
Changed exposed pad/SGND label
7
Added sentence to final paragraph and added A,B references
9
Changed to ENBA and ENBB on Tables 1 and 2
10
Added LTC4415 to Related Parts table
16
F
09/16
Changed y-axis on graph G27 to OVI-OVP
7
G
09/17
Changed MP2 diode connection Figures 2, 4
12, 13
441312fg
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 representation that the interconnection
of itsinformation
circuits as described
herein will not infringe on existing patent rights.
For more
www.linear.com/LTC4413-1
17
LTC4413-1/LTC4413-2
Typical Application
Automatic Switchover from a Battery to a Wall Adapter with Soft-Start Overvoltage Protection
FDR8508
WALL
ADAPTER
INPUT
INA
C1
10µF
C2
10nF
0.1µF
D1
OPTIONAL
OUTA
IDEAL
VCC
RSTAT
470k
RENBA
560k
D2
5.6V
1Ω
ENBA
STAT
LTC4413-2
OVI
GND
STAT
OVP
OUTB
OVP
ENBB
INB
BAT
+
COUT
4.7µF
IDEAL
TO LOAD
441312 F07
C1: C0805C106K8PAC
C2: C0403C103K8PAC
COUT: C1206C475K8PAC
STAT IS HIGH WHEN WALL ADAPTER IS
SUPPLYING LOAD CURRENT
OVP IS HIGH WHEN WALL ADAPTER
VOLTAGE > 6V
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
LTC4350
Hot Swappable Load Share Controller
Allows N + 1 Redundant Supply, Equally Loads Multiple Power
Supplies Connected in Parallel
LTC4411
2.6A Low Loss Ideal Diode in ThinSOT
No External MOSFET, Automatic Switching Between DC Sources,
Simplified Load Sharing
LTC4412/
LTC4412HV
PowerPath Controller in ThinSOT
More Efficient than Diode OR’ing, Automatic Switching Between DC
Sources, Simplified Load Sharing, 3V ≤ VIN ≤ 28V, 3V ≤ VIN ≤ 36V
(HV)
LTC4413
Dual 2.6A, 2.5V to 5.5V, Ideal Diodes in 3mm × 3mm DFN Lower Quiescent Current with Slower Response Time
LTC4414
36V, Low Loss PowerPath Controller for Large PFETs
Drives Large QG PFETs, Very Low Loss Replacement for Power Supply
O’Ring Diodes, 3.5V to 36V AC/DC Adapter Voltage Range, 8-Lead
MSOP Package
LTC4415
Dual 4A Ideal Diodes with Adjustable Current Limit
1.7V to 5.5V Operating Range, 50mΩ PMOS, Soft-Start, 15mV
Forward Drop, MSOP-16 and 3mm × 5mm DFN-16 Packages
441312fg
18
LT 0917 REV G • PRINTED IN USA
www.linear.com/LTC4413-1
For more information www.linear.com/LTC4413-1
LINEAR TECHNOLOGY CORPORATION 2006