diodes, each capable of supplying up to 4A with typical
forward conduction resistance of 50mΩ. The diode voltage
drops are regulated to 15mV during forward conduction at
low currents, extending the power supply operating range
and ensuring no oscillations during supply switchover.
Less than 1µA of reverse current flows from OUT to IN
making this device well suited for power supply ORing
applications.
The two ideal diodes are independently enabled and
prioritized using inputs EN1 and
EN2.
The output current
limits can be adjusted independently from 0.5A to 4A
using resistors on the CLIM pins. Furthermore, the ideal
diode currents can be monitored via CLIM pin voltages.
Open-drain status pins indicate when the ideal diodes are
forward conducting. When the die temperature approaches
thermal shutdown, or if the output load exceeds the cur-
rent limit threshold, the corresponding warning pins are
pulled low.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Dual 50mΩ Monolithic Ideal Diodes
1.7V to 5.5V Operating Range
Up to 4A Adjustable Current Limit for Each Diode
Low Reverse Leakage Current (1µA Max)
15mV Forward Drop in Regulation
Smooth Switchover in Diode ORing
Load Current Monitor
Precision Enable Thresholds to Set Switchover
Soft-Start to Limit Inrush Current on Start-Up
Status Pins to Indicate Forward Diode Conduction
Current and Thermal Limit with Warning
Thermally Enhanced 16-Lead MSOP and DFN
(3mm
×
5mm) Packages
applicaTions
n
n
n
n
n
n
High Current PowerPath™ Switch
Battery and Wall Adapter Diode ORing
Backup Battery Diode ORing
Logic Controlled High Current Power Switch
Supercapacitor ORing
Multiple Battery Sharing
Typical applicaTion
Prioritized Power Supply ORing
PRIMARY
POWER
SOURCE
IN1
100k
21.5k
124
124
EN2
SECONDARY
POWER
SOURCE
IDEAL
LTC4415
EN1
CLIM1
CLIM2
STAT1
WARN1
WARN2
STAT2
IDEAL
GND
OUT2
4415 TA01a
Forward Characteristics of LTC4415
vs MBRS410E Schottky
TO
LOAD
LOAD CURRENT (A)
4
LTC4415
3
SCHOTTKY
DIODE
MBRS410E
R
ON
= 50m
1
CURRENT LIMIT
OUT1
4.7µF
2
+
IN2
0
0
100
300
400
200
FORWARD VOLTAGE DROP (mV)
500
4415 TA01b
4415fa
1
LTC4415
absoluTe MaxiMuM raTings
(Note 1)
IN1, IN2, OUT1, OUT2, CLIM1, CLIM2,
STAT1, STAT2, WARN1, WARN2
Voltage ....... –0.3V to 6V
EN1,
EN2
Voltage ................. –0.3V to Max (V
INx
, V
OUTx
)
Operating Junction Temperature Range
(Notes 3, 4) .............................................–40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Peak Reflow Temperature ..................................... 260°C
pin conFiguraTion
TOP VIEW
IN1*
IN1*
EN1
CLIM1
CLIM2
EN2
IN2*
IN2*
1
2
3
4
5
6
7
8
17
GND
16 OUT1*
15 OUT1*
14
STAT1
13
WARN1
12
WARN2
11
STAT2
10 OUT2*
9
OUT2*
IN1*
IN1*
EN1
CLIM1
CLIM2
EN2
IN2*
IN2*
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
OUT1*
OUT1*
STAT1
WARN1
WARN2
STAT2
OUT2*
OUT2*
17
GND
DHC PACKAGE
VARIATION A
16-LEAD (5mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*ADJACENT PINS ON THE FOUR CORNERS ARE FUSED TOGETHER
MSE PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 35°C/W TO 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*ADJACENT PINS ON THE FOUR CORNERS ARE FUSED TOGETHER INTERNALLY.
orDer inForMaTion
LEAD FREE FINISH
LTC4415EDHC#PBF
LTC4415IDHC#PBF
LTC4415EMSE#PBF
LTC4415IMSE#PBF
TAPE AND REEL
LTC4415EDHC#TRPBF
LTC4415IDHC#TRPBF
LTC4415EMSE#TRPBF
LTC4415IMSE#TRPBF
PART MARKING*
4415
4415
4415
4415
PACKAGE DESCRIPTION
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead (5mm
×
3mm) Plastic DFN
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
4415fa
2
LTC4415
elecTrical characTerisTics
SYMBOL
PARAMETER
V
IN1
, V
OUT1
, Operating Supply Range
V
IN2
, V
OUT2
V
UVLO
I
QF
I
QOFF
I
QR(OUT)
I
QR(IN)
I
LEAK(IN)
V
FR
V
RTO
R
FR
R
ON
t
ON
t
ON(SD)
t
SWITCH
t
OFF
t
SS
Undervoltage Lockout
Quiescent Current In Forward Regulation
(Note 5)
Quiescent Current In Shutdown
Reverse Turn-Off Current: OUT1
OUT2
INx Pin Current In Reverse Turn-Off
INx Pin Leakage Current
Reverse Turn-Off Voltage (V
INx
– V
OUTx
)
Forward Dynamic Resistance in
Regulation
On-Resistance in Constant Resistance
Mode
PowerPath Turn-On Time (Notes 6, 7)
I
OUTx
= –100mA to –300mA
I
OUTx
= –1A
Before Enable V
OUT1
= 1.5V, Diode 1
Before Enable V
OUT2
= 1.5V, Diode 2
Before Enable V
OUTx
= 0V
Both Diodes Disabled and V
OUTx
= 1.5V Before Enable
Both Diodes Disabled and V
OUTx
= 0V Before Enable
V
INx
↑
(2.6V to 4.6V) to V
OUTx
Starts Rising, Both
Diodes Enabled, OUT1 and OUT2 Tied Together
Disable to I
IN
Falling from 100mA to 1mA
V
OUTx
= 0V
I
CLIMx
/I
OUTx
When I
OUTx
= –4A
I
CLIMx
/I
OUTx
When I
OUTx
= –2A
In Current Limit
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Notes 2, 3). V
IN1
= V
IN2
= 3.6V, R
CLIM
= 250Ω, unless otherwise
specified.
CONDITIONS
At Least One Input/Output Must Be in This Range
V
INx
Rising
Hysteresis
V
IN1
= V
EN1
= V
EN2
= 3.6V, I
OUT1
= –1mA,
V
IN2
= V
OUT2
= 0V, Measured Through GND Pin
V
IN1
= V
IN2
= V
EN2
= 3.6V, V
EN1
= 0V,
V
OUT1
= V
OUT2
= 0V, Measured Through GND Pin
V
IN1
= 3.6V, V
OUT1
= 3.7V, V
IN2
= 3.5V, V
OUT2
= 3.6V
(V
OUT1
> V
OUT2
)
V
OUT1
= V
OUT2
= 5.5V
V
IN1
= V
IN2
= 0V, V
OUT1
= V
OUT2
= 5.5V
l
l
l
l
l
l
l
l
l
MIN
1.7
TYP
MAX
5.5
UNITS
V
V
mV
µA
µA
µA
µA
µA
µA
mV
mV
mΩ
mΩ
µs
µs
µs
µs
µs
µs
µs
ms
1.63
55
44
13
18
5
4
–1
5
–50
15
–30
18
50
10
23
250
70
320
9
2
2
0.9
0.8
1
1
0.5
0.5
1.7
80
28
40
11
10
1
25
–10
30
70
Forward Regulation Voltage (V
INx
– V
OUTx
) I
OUTx
= –1mA
PowerPath Turn-On from Shutdown
(Note 7)
PowerPath Switchover Time
PowerPath Turn-Off Time
Soft-Start Duration (Note 8)
Current Monitor Ratio
Current Monitor
1.1
1.2
mA/A
mA/A
V
4
±8
±15
4
6
130
15
160
20
l
l
Current Limit
V
CLIM
I
LIM(ADJ)
CLIM Clamp Voltage
Current Limit Adjustability
Accuracy of Adjustable Current Limit
Threshold
I
LIM(INT)
T
WARN
T
SD
Internal Current Limit
Thermal Warning Threshold
Thermal Shutdown Threshold
V
OUTx
= V
INx
– 0.5V, Current Limit = 4A
V
OUTx
= V
INx
– 0.5V, Current Limit = 2A
R
CLIMx
= 0Ω, V
OUTx
= 0V
Rising Temperature
Hysteresis
Rising Temperature
Hysteresis
Current Into Open-Drain Output = 3mA
Open-Drain Output Voltage = 5.5V
EN1 Rising to
STAT1
Pull-Down
EN2
Falling to
STAT2
Pull-Down
A
%
%
A
°C
°C
°C
°C
0.4
1
V
µA
µs
µs
4415fa
l
l
l
9
Open-Drain Status Outputs (STAT1,
WARN1, STAT2, WARN2)
V
OL
t
STAT(ON)
Open-Drain Output Low Voltage
Open-Drain Output High Leakage Current
STAT
Turn-On Time (Note 6)
0.05
0
5
18
3
LTC4415
elecTrical characTerisTics
SYMBOL
t
STAT(OFF)
t
WARN(ON)
t
WARN(OFF)
V
ENTH
V
ENHYST
PARAMETER
STAT
Turn-Off Time
WARN
Turn-On Time
WARN
Turn-Off Time
EN1 Rising and
EN2
Falling Thresholds
EN1 and
EN2
Hysteresis
Enable Pin Current When Pulled High
V
EN1
= V
EN2
= 3.6V
l
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Notes 2, 3). V
IN1
= V
IN2
= 3.6V, R
CLIM
= 250Ω, unless otherwise
specified.
CONDITIONS
Disable to
STAT
Pull-Up
Current Limit to
WARN
Pull-Down
Out of Current Limit to
WARN
Pull-Up
l
MIN
TYP
2
500
5
MAX
UNITS
µs
µs
µs
Enable Inputs (EN1,
EN2)
760
800
55
0
1
840
mV
mV
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:
Unless otherwise specified, current into a pin is positive and
current out of a pin is negative.
Note 3:
The LTC4415 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC4415E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC4415I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
The junction temperature (T
J
in °C) is calculated from the ambient
temperature (T
A
in °C) and power dissipation (P
D
in Watts) according to
the formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
Note that the maximum ambient temperature consistent with these
specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 4:
The LTC4415 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 5:
One channel enabled. Quiescent current is identical for each
channel.
Note 6:
Enable inputs are driven to supply levels. Other diode is already
enabled so the chip bias circuits are active.
Note 7:
Turn-on time is measured from enable to I
OUTx
rising through
1mA. When the output voltage is more than 1.2V, soft-start is disabled and
turn-on is faster.
Note 8:
Current ramps from zero to the current limit during the soft-start
duration. Soft-start is measured from 10% to 90% of the current limit. If
the load condition is such that the current does not need to go up to the
current limit during start-up, the output voltage may reach steady state
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