LTC4414 TM 36V, Low Loss PowerPath Controller for Large PFETs FEATURES DESCRIPTIO Designed Specifically to Drive Large Q PFETs The LTC 4414 controls an external P-channel MOSFET to G Very Low Loss Replacement for Power Supply create a near ideal diode function for power switchover. ORing Diodes This permits highly efficient ORing of multiple power 3.5V to 36V AC/DC Adapter Voltage Range sources for extended battery life and low self- heating. When Minimal External Components conducting, the voltage drop across the MOSFET is typi- Automatic Switching Between DC Sources cally 20mV. For applications with a wall adapter or other aux- Low Quiescent Current: 30A iliary power source, the load is automatically disconnected 3V to 36V Battery Voltage Range from the battery when the auxiliary source is connected. Limited Reverse Battery Protection Two or more LTC4414s may be interconnected to allow MOSFET Gate Protection Clamp switchover between multiple batteries or charging of mul- Manual Control Input tiple batteries from a single charger. Space Saving 8-Lead MSOP Package The wide supply operating range supports operation from one to eight Li-Ion cells in series. The low quiescent U current (30A typical) is independent of the load current. APPLICATIO S The gate driver includes an internal voltage clamp for High Current Power Path Switch MOSFET protection. Industrial and Automotive Applications The STAT pin can be used to enable an auxiliary P-channel Uninterruptable Power Supplies MOSFET power switch when an auxiliary supply is Logic Controlled Power Switch detected. This pin may also be used to indicate to a micro- Battery Backup Systems controller that an auxiliary supply is connected. The con- Emergency Systems with Battery Backups trol (CTL) input enables the user to force the primary , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other MOSFET off and the STAT pin low. trademarks are the property of their respective owners. The LTC4414 is available in a low profile 8-lead MSOP package. TYPICAL APPLICATIO LTC4414 vs Schottky Diode Forward Voltage Drop 8.0 Automatic Switchover of Load Between a Battery and a Power Supply CONSTANT UPS840 POWER R ON SUPPLY INPUT SUP75P03 07 3.6 TO LOAD BATTERY LTC4414 C OUT CELL(S) LTC4414 V CC V SENSE IN CONSTANT VOLTAGE GND GATE 470k SCHOTTKY STATUS OUTPUT DIODE CTL STAT LOW WHEN POWER 4414 TA01 SUPPLY PRESENT NC NC 0 0.02 0.5 FORWARD VOLTAGE (V) 4414 TA01b 4414fc 1 CURRENT (A) U ULTC4414 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Supply Voltage (V ) .................................. 14V to 40V IN TOP VIEW Voltage from V to SENSE ........................ 40V to 40V STAT 1 8 GATE IN CTL 2 7 V IN Input Voltage GND 3 6 SENSE NC 4 5 NC CTL ........................................................0.3V to 40V MS8 PACKAGE SENSE .................................................... 14V to 40V 8-LEAD PLASTIC MSOP Output Voltage T = 125C, = 200C/W JMAX JA GATE ..................... 0.3V to the Higher of V + 0.3V IN ORDER PART NUMBER MS8 PART MARKING or SENSE + 0.3V STAT .....................................................0.3V to 40V LTC4414EMS8 LTBQF Operating Ambient Temperature Range (Note 2) LTC4414IMS8 LTBQG I Grade ............................................ 40C to 125C Order Options Tape and Reel: Add TR E Grade.............................................. 40C to 85C Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Operating Junction Temperature ......... 40C to 125C Lead Free Part Marking: