LTC4412HV TM 36V, Low Loss PowerPath Controller in ThinSOT FEATURES DESCRIPTIO n Very Low Loss Replacement for Power Supply The LTC 4412HV controls an external P-channel MOSFET ORing Diodes to create a near ideal diode function for power switchover n 3V to 36V AC/DC Adapter Voltage Range or load sharing. This permits highly efficient ORing of mul- n 40 C to 125 C Operating Temperature Range tiple power sources for extended battery life and low self- n Minimal External Components heating. When conducting, the voltage drop across the n Automatic Switching Between DC Sources MOSFET is typically 20mV. For applications with a wall n Simplifies Load Sharing with Multiple Batteries adapter or other auxiliary power source, the load is auto- n Low Quiescent Current: 11m A matically disconnected from the battery when the auxiliary n 2.5V to 36V Battery Voltage Range source is connected. Two or more LTC4412HVs may be in- n Reverse Battery Protection terconnected to allow load sharing between multiple bat- n Drives Almost Any Size MOSFET for Wide Range of teries or charging of multiple batteries from a single charger. Current Requirements The LTC4412HV is an extended supply and temperature n MOSFET Gate Protection Clamp range version of the LTC4412. n Manual Control Input The wide supply operating range supports operation from TM n Low Profile (1mm) SOT-23 (ThinSOT ) Package one to eight Li-Ion cells in series. The low quiescent U current (11m A typical) is independent of the load current. APPLICATIO S The gate driver includes an internal voltage clamp for MOSFET protection. n Industrial and Automotive Applications n Notebook and Handheld Computers The STAT pin can be used to enable an auxiliary P-channel n USB-Powered Peripherals MOSFET power switch when an auxiliary supply is n Uninterruptable Power Supplies detected. This pin may also be used to indicate to a micro- n Logic Controlled Power Switch controller that an auxiliary supply is connected. The con- , LTC and LT are registered trademarks of Linear Technology Corporation. trol (CTL) input enables the user to force the primary PowerPath and ThinSOT are trademarks of Linear Technology Corporation. MOSFET off and the STAT pin low. The LTC4412HV is available in a low profile (1mm) SOT-23 package. LTC4412HV vs Schottky Diode Forward Voltage Drop TYPICAL APPLICATIO 1 CONSTANT 1N5819 WALL R ON ADAPTER INPUT FDN306P TO LOAD BATTERY LTC4412HV C OUT CELL(S) LTC4412HV 1 6 V CC V SENSE IN CONSTANT 2 5 VOLTAGE GND GATE 470k SCHOTTKY STATUS OUTPUT 3 4 DIODE CTL STAT LOW WHEN WALL 4412HV F01 ADAPTER PRESENT 0 0.02 Figure 1. Automatic Switchover of Load Between a Battery and a Wall Adapter 0.5 FORWARD VOLTAGE (V) 4412HV F01b sn4412hv 4412hvfs 1 CURRENT (A) U ULTC4412HV ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Supply Voltage (V ) .................................. 14V to 40V ORDER PART IN Voltage from V to SENSE ........................ 40V to 40V NUMBER IN Input Voltage TOP VIEW LTC4412HVIS6 CTL ........................................................0.3V to 40V V 1 6 SENSE SENSE .................................................... 14V to 40V IN GND 2 5 GATE Output Voltage CTL 3 4 STAT GATE ..................... 0.3V to the Higher of V + 0.3V IN S6 PACKAGE or SENSE + 0.3V S6 PART MARKING 6-LEAD PLASTIC TSOT-23 STAT .....................................................0.3V to 40V T = 125 C, q = 230 C/W JMAX JA LTBHR Operating Ambient Temperature Range (Note 2) ........................................... 40 C to 125 C Operating Junction Temperature ......... 40 C to 125 C Storage Temperature Range ................. 65 C to 150 C Lead Temperature (Soldering, 10 sec).................. 300 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, unless otherwise noted specifications are at T = 25 C, V = 12V, CTL and GND = 0V. Current into a pin is positive A IN and current out of a pin is negative. All voltages are referenced to GND, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V , Operating Supply Range V and/or V Must Be in This Range l 2.5 36 V IN IN SENSE V for Proper Operation SENSE I Quiescent Supply Current at Low Supply V = 3.6V. Measure Combined Current l 11 19 m A QFL IN While in Forward Regulation at V and SENSE Pins Averaged with IN V = 3.5V and V = 3.6V (Note 3) SENSE SENSE I Quiescent Supply Current at High Supply V = 36V. Measure Combined Current l 18 32 m A QFH IN While in Forward Regulation at V and SENSE Pins Averaged with IN V = 35.9V and V = 36V (Note 3) SENSE SENSE I Quiescent Supply Current at Low Supply V = 3.6V, V = 3.7V. Measure 10 19 m A QRL IN SENSE While in Reverse Turn-Off Combined Current of V and SENSE Pins IN I Quiescent Supply Current at High Supply V = 35.9V, V = 36V. Measure 19 33 m A QRH IN SENSE While in Reverse Turn-Off Combined Current of V and SENSE Pins IN I Quiescent Supply Current at Low Supply V = 3.6V, V = 0V, V = 1V 7 13 m A QCL IN SENSE CTL with CTL Active I Quiescent Supply Current at High Supply V = 36V, V = 8V, V = 1V 15 25 m A QCH IN SENSE CTL with CTL Active I V and SENSE Pin Leakage Currents V = 28V, V = 0V V = 28V, V = 0V 3 0 1 m A LEAK IN IN SENSE SENSE IN When Other Pin Supplies Power V = 14V, V = 14V V = 14V, V = 14V IN SENSE SENSE IN PowerPath Controller V PowerPath Switch Forward Regulation V V , 2.5V V 36V l 10 20 32 mV FR IN SENSE IN Voltage V PowerPath Switch Reverse Turn-Off V V , 2.5V V 36V l 10 20 32 mV RTO SENSE IN IN Threshold Voltage sn4412hv 4412hvfs 2 U W U U WWW