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Linear Technology Electronic Components Datasheet

LTC4414IMS8 Datasheet

Low Loss PowerPath Controller

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FEATURES
Designed Specifically to Drive Large QG PFETs
Very Low Loss Replacement for Power Supply
OR’ing Diodes
3.5V to 36V AC/DC Adapter Voltage Range
Minimal External Components
Automatic Switching Between DC Sources
Low Quiescent Current: 30µA
3V to 36V Battery Voltage Range
Limited Reverse Battery Protection
MOSFET Gate Protection Clamp
Manual Control Input
Space Saving 8-Lead MSOP Package
U
APPLICATIO S
High Current Power Path Switch
Industrial and Automotive Applications
Uninterruptable Power Supplies
Logic Controlled Power Switch
Battery Backup Systems
Emergency Systems with Battery Backups
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC4414 www.DataSheet4U.com
36V, Low Loss PowerPathTM
Controller for Large PFETs
DESCRIPTIO
The LTC®4414 controls an external P-channel MOSFET to
create a near ideal diode function for power switchover.
This permits highly efficient OR’ing of multiple power
sources for extended battery life and low self- heating. When
conducting, the voltage drop across the MOSFET is typi-
cally 20mV. For applications with a wall adapter or other aux-
iliary power source, the load is automatically disconnected
from the battery when the auxiliary source is connected.
Two or more LTC4414s may be interconnected to allow
switchover between multiple batteries or charging of mul-
tiple batteries from a single charger.
The wide supply operating range supports operation from
one to eight Li-Ion cells in series. The low quiescent
current (30µA typical) is independent of the load current.
The gate driver includes an internal voltage clamp for
MOSFET protection.
The STAT pin can be used to enable an auxiliary P-channel
MOSFET power switch when an auxiliary supply is
detected. This pin may also be used to indicate to a micro-
controller that an auxiliary supply is connected. The con-
trol (CTL) input enables the user to force the primary
MOSFET off and the STAT pin low.
The LTC4414 is available in a low profile 8-lead MSOP
package.
TYPICAL APPLICATIO
Automatic Switchover of Load Between a Battery and a Power Supply
POWER
SUPPLY
INPUT
BATTERY
CELL(S)
UPS840
SUP75P03_07
LTC4414
VIN SENSE
GND GATE
CTL STAT
NC
NC
COUT
VCC
TO LOAD
470k STATUS OUTPUT
LOW WHEN POWER
4414 TA01 SUPPLY PRESENT
LTC4414 vs Schottky Diode Forward Voltage Drop
8.0
CONSTANT
RON
3.6
LTC4414
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
0
0.02
FORWARD VOLTAGE (V)
0.5
4414 TA01b
4414fc
1


Linear Technology Electronic Components Datasheet

LTC4414IMS8 Datasheet

Low Loss PowerPath Controller

No Preview Available !

LTC4414
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (VIN) .................................. –14V to 40V
Voltage from VIN to SENSE ........................ – 40V to 40V
Input Voltage
CTL ........................................................– 0.3V to 40V
SENSE .................................................... –14V to 40V
Output Voltage
GATE ..................... –0.3V to the Higher of VIN + 0.3V
or SENSE + 0.3V
STAT .....................................................– 0.3V to 40V
Operating Ambient Temperature Range (Note 2)
I Grade ............................................ – 40°C to 125°C
E Grade.............................................. – 40°C to 85°C
Operating Junction Temperature ......... – 40°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
STAT 1
CTL 2
GND 3
NC 4
8 GATE
7 VIN
6 SENSE
5 NC
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 200°C/W
ORDER PART NUMBER MS8 PART MARKING
LTC4414EMS8
LTC4414IMS8
LTBQF
LTBQG
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, unless otherwise noted specifications are at TA = 25°C, VIN = 12V, CTL and GND = 0V. Current into a pin is positive
and current out of a pin is negative. All voltages are referenced to GND, unless otherwise specified.
SYMBOL
VIN,
VSENSE
IQFL
PARAMETER
Operating Supply Range
Quiescent Supply Current at Low Supply
While in Forward Regulation
IQFH
Quiescent Supply Current at High Supply
While in Forward Regulation
IQRL
Quiescent Supply Current at Low Supply
While in Reverse Turn-Off
IQRH
Quiescent Supply Current at High Supply
While in Reverse Turn-Off
IQCL
Quiescent Supply Current at Low Supply
with CTL Active
IQCH
Quiescent Supply Current at High Supply
with CTL Active
ILEAK
VIN and SENSE Pin Leakage Currents
When Other Pin Supplies Power
PowerPath Controller
VFR
PowerPath Switch Forward Regulation
Voltage
VRTO
PowerPath Switch Reverse Turn-Off
Threshold Voltage
CONDITIONS
VIN and/or VSENSE Must Be in This Range
for Proper Operation
VIN = 3.6V. Measure Combined Current
at VIN and SENSE Pins Averaged with
VSENSE = 3.5V and VSENSE = 3.6V (Note 3)
VIN = 36V. Measure Combined Current
at VIN and SENSE Pins Averaged with
VSENSE = 35.9V and VSENSE = 36V (Note 3)
VIN = 3.6V, VSENSE = 3.7V. Measure
Combined Current of VIN and SENSE Pins
VIN = 35.9V, VSENSE = 36V. Measure
Combined Current of VIN and SENSE Pins
VIN = 3.6V, VCTL = 1V,
VIN – VSENSE = 0.9V
VIN = 36V, VCTL = 1V,
VIN – VSENSE = 0.9V
VIN = 28V, SENSE = 0V
VIN = 14V, SENSE = –14V
VIN = 36V, SENSE = 8V
VIN = 0V, SENSE = 28V
VIN = –14V, SENSE = 14V
VIN = 8V, SENSE = 36V
VIN – VSENSE, 3V VIN 36V, CGATE = 3nF
VSENSE – VIN, 3V VIN 36V, CGATE = 3nF
MIN TYP MAX UNITS
3
36
V
31
60
µA
36
61
µA
21
30
µA
33
45
µA
14
20
µA
26
35
µA
–10
–1
1
µA
–10
1
µA
–10
1
µA
–10
1
µA
–10
1
µA
–10
1
µA
10
10
32
mV
32
mV
4414fc
2


Part Number LTC4414IMS8
Description Low Loss PowerPath Controller
Maker Linear
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