LTC4412 - Low Loss PowerPath Controller in ThinSOT

1 LTC4412 . Low Loss PowerPath . Controller in ThinSOT . Features Description nn Very Low Loss Replacement for Power Supply The LTC 4412 controls an external P-channel MOSFET to OR'ing Diodes create a near ideal diode function for power switchover nn Minimal External Components or load sharing . This permits highly efficient OR'ing of nn Automatic Switching Between DC Sources multiple power sources for extended battery life and low nn Simplifies load sharing with Multiple Batteries self-heating. When conducting, the voltage drop across nn Low Quiescent Current: 11 A the MOSFET is typically 20mV.

2 For applications with a nn 3V to 28V AC/DC Adapter Voltage Range wall adapter or other auxiliary power source, the load is nn to 28V Battery Voltage Range automatically disconnected from the battery when the nn Reverse Battery Protection auxiliary source is connected. Two or more LTC4412s nn Drives Almost Any Size MOSFET for Wide Range of may be interconnected to allow load sharing between Current Requirements multiple batteries or charging of multiple batteries from nn MOSFET Gate Protection Clamp a single charger.

3 Nn Manual Control Input The wide supply operating range supports operation nn Low Profile (1mm) ThinSOT Package from one to six Li-Ion cells in series. The low quiescent current (11 A typical) is independent of the load current. Applications The gate driver includes an internal voltage clamp for MOSFET protection. nn Cellular Phones nn Notebook and Handheld Computers The STAT pin can be used to enable an auxiliary P-channel nn Digital Cameras MOSFET power switch when an auxiliary supply is nn USB-Powered Peripherals detected.

4 This pin may also be used to indicate to a mi- nn Uninterruptible Power Supplies crocontroller that an auxiliary supply is connected. The nn Logic Controlled Power Switch control (CTL) input enables the user to force the primary MOSFET off and the STAT pin low. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks The LTC4412 is available in a low profile (1mm) ThinSOT . are the property of their respective owners.

5 Package. Typical Application LTC4412 vs Schottky Diode Forward Voltage Drop 1. WALL. CONSTANT. ADAPTER. RON. INPUT. TO load . BATTERY. COUT. CURRENT (A). CELL(S). LTC4412 LTC4412 . VCC. VIN SENSE. GND GATE 470k CONSTANT. STATUS OUTPUT. CTL STAT LOW WHEN WALL VOLTAGE. 4412 F01. SCHOTTKY. ADAPTER PRESENT DIODE. Figure 1. Automatic Switchover of load Between a Battery and a Wall Adapter 0. FORWARD VOLTAGE (V) 4412 F01b 4412fb For more information 1. LTC4412 . Absolute Maximum Ratings Pin Configuration (Note 1).

6 Supply Voltage (VIN).. 14V to 36V. Voltage from VIN to 28V to 28V TOP VIEW. Input Voltage VIN 1 6 SENSE. to 36V GND 2 5 GATE. 14V to 36V CTL 3 4 STAT. Output Voltage S6 PACKAGE. GATE .. to the Higher of VIN + 6-LEAD PLASTIC TSOT-23. or SENSE + TJMAX = 150 C, JA = 230 C/W. to 36V. Operating Junction Temperature Range (Note 2) .. 55 C to 150 C. Storage Temperature 65 C to 150 C. Lead Temperature (Soldering, 10 sec).. 300 C. Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE.

7 LTC4412ES6#PBF LTC4412ES6#TRPBF LTA2 6-Lead Plastic TSOT-23 40 C to 85 C. LTC4412IS6#PBF LTC4412IS6#TRPBF LTA2 6-Lead Plastic TSOT-23 40 C to 85 C. LTC4412HS6#PBF LTC4412HS6#TRPBF LTA2 6-Lead Plastic TSOT-23 40 C to 150 C. LTC4412 MPS6#PBF LTC4412 MPS6#TRPBF LTA2 6-Lead Plastic TSOT-23 55 C to 150 C. LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE. LTC4412ES6 LTC4412ES6#TR LTA2 6-Lead Plastic TSOT-23 40 C to 85 C. LTC4412IS6 LTC4412IS6#TR LTA2 6-Lead Plastic TSOT-23 40 C to 85 C.

8 LTC4412HS6 LTC4412HS6#TR LTA2 6-Lead Plastic TSOT-23 40 C to 150 C. LTC4412 MPS6 LTC4412 MPS6#TR LTA2 6-Lead Plastic TSOT-23 55 C to 150 C. Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifications, go to: 4412fb 2 For more information LTC4412 . Electrical Characteristics The l denotes the specifications which apply over the full operating junction temperature range, unless otherwise noted specifications are at TA = 25 C, VIN = 12V, CTL and GND = 0V.

9 Current into a pin is positive and current out of a pin is negative. All voltages are referenced to GND, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VIN, Operating Supply Range VIN and/or VSENSE Must Be in This Range l 28 V. VSENSE for Proper Operation IQFL Quiescent Supply Current at Low Supply VIN = Measure Combined Current l 11 19 A. While in Forward Regulation at VIN and SENSE Pins Averaged with VSENSE = and VSENSE = (Note 3). IQFH Quiescent Supply Current at High Supply VIN = 28V.

10 Measure Combined Current l 15 26 A. While in Forward Regulation at VIN and SENSE Pins Averaged with VSENSE = and VSENSE = 28V (Note 3). IQRL Quiescent Supply Current at Low Supply VIN = , VSENSE = Measure 10 19 A. While in Reverse Turn-Off Combined Current of VIN and SENSE Pins IQRH Quiescent Supply Current at High Supply VIN = , VSENSE = 28V. Measure 16 28 A. While in Reverse Turn-Off Combined Current of VIN and SENSE Pins IQCL Quiescent Supply Current at Low Supply VIN = , VSENSE = 0V, VCTL = 1V 7 13 A.