ltc4414ems8-trpbf Linear Technology Corporation, ltc4414ems8-trpbf Datasheet

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ltc4414ems8-trpbf

Manufacturer Part Number
ltc4414ems8-trpbf
Description
36v, Low Loss Powerpath Controller For Large Pfets
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATIO
APPLICATIO S
Automatic Switchover of Load Between a Battery and a Power Supply
BATTERY
SUPPLY
CELL(S)
POWER
INPUT
Designed Specifically to Drive Large Q
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
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.
V
GND
CTL
NC
IN
LTC4414
UPS840
SENSE
GATE
STAT
U
NC
SUP75P03_07
U
C
V
OUT
CC
4414 TA01
470k
G
PFETs
TO LOAD
STATUS OUTPUT
LOW WHEN POWER
SUPPLY PRESENT
DESCRIPTIO
The LTC
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.
36V, Low Loss PowerPath
Controller for Large PFETs
®
4414 controls an external P-channel MOSFET to
LTC4414 vs Schottky Diode Forward Voltage Drop
8.0
3.6
0
0.02
U
LTC4414
FORWARD VOLTAGE (V)
CONSTANT
CONSTANT
VOLTAGE
R
ON
SCHOTTKY
DIODE
LTC4414
4414 TA01b
0.5
4414fc
1
TM

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ltc4414ems8-trpbf Summary of contents

Page 1

... 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. U TYPICAL APPLICATIO ...

Page 2

... U RATINGS PACKAGE/ORDER + 0.3V IN ORDER PART NUMBER LTC4414EMS8 LTC4414IMS8 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ● ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, unless otherwise noted specifications are at T and current out of a pin is negative. All voltages are referenced to GND, unless otherwise specified. SYMBOL PARAMETER GATE and STAT Outputs GATE Active Forward Regulation I Source ...

Page 4

LTC4414 W U TYPICAL PERFOR A CE CHARACTERISTICS V vs Temperature and FR Supply Voltage 28V 36V – 100 TEMPERATURE (°C) 4414 G01 V and ...

Page 5

CTIO S STAT (Pin 1): Open-Drain Output Status Pin. When the SENSE pin is pulled above the V IN power source more, the reverse turn-off RTO threshold ( reached. The ...

Page 6

LTC4414 U OPERATIO Operation can best be understood by referring to the Block Diagram, which illustrates the internal circuit blocks along with the few external components, and the graph that accompanies the Typical Application drawing on the front page of ...

Page 7

U U APPLICATIO S I FOR ATIO Introduction The system designer will find the LTC4414 useful in a variety of cost and space sensitive power control applica- tions that include low loss diode OR’ing, fully automatic switchover from a primary ...

Page 8

LTC4414 U U APPLICATIO S I FOR ATIO way to avoid unwanted I • R drops in the power path. Both pins are protected from negative voltages. GATE Pin Usage The GATE pin controls the external P-channel MOSFET connected between ...

Page 9

U TYPICAL APPLICATIO S Automatic PowerPath Control The applications shown in Figures 1 and 2 and the typical application shown on the first page of this data sheet are automatic ideal diode controllers that require no assis- tance from a ...

Page 10

LTC4414 U TYPICAL APPLICATIO S This is due to the SENSE pin voltage rising above the battery voltage and turning off the MOSFET before the Schottky diode turns on. The factors that determine the magnitude of the voltage droop are ...

Page 11

... For intelligent control, the 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... MAX REF 0.127 ± 0.076 0.22 – 0.38 (.005 ± .003) (.009 – .015) 0.65 TYP MSOP (MS8) 0204 (.0256) BSC 4414fc LT/LWI 0806 REV C • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2005 ...

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