LTC4419 18V Dual Input Micropower PowerPath Prioritizer Fea T Descrip T n Selects Highest Priority Valid Supply from Two Inputs The LTC 4419 is a dual input monolithic PowerPath n Wide 1.8V to 18V Operating Range prioritizer with low operating current, that provides backup n Internal Dual 2, 0.5A Switches switchover for keeping critical circuitry alive during brown n Low 3.6A Operating Current out and power loss conditions. Unlike diode-OR products, n Low 320nA V2 Current When V1 Connected to OUT little current is drawn from the inactive supply even if its n Blocks Reverse and Cross Conduction Currents voltage is greater than the active supply. n Reverse Supply Protection to 15V Internal 2, current limited PMOS switches provide power n V2 Freshness Seal/Ship Mode path selection from a primary input (V1) or a backup input n 1.5% Accurate Adjustable Switchover Threshold (V2) to the output. An adjustable voltage monitor set via n Two Auxiliary 2.3% Accurate Voltage Comparators an external resistive divider provides flexibility in setting n Overcurrent and Thermal Protection the V1 to V2 switchover threshold. When primary input V1 n Thermally Enhanced 10-Pin 3mm 3mm DFN drops, the ADJ monitor input causes OUT to be switched and 12-Lead Exposed Pad MSOP Packages to V2. Fast non-overlap switchover circuitry prevents both reverse and cross conduction while minimizing output a T droop. n Low Power Battery Backup The LTC4419 has two auxiliary comparators with open- n Portable Equipment drain outputs that provide flexible voltage monitoring. The n Point-of-Sale (POS) Equipment V2ON output indicates if V2 is powering OUT. Freshness seal mode prevents V2 battery discharge during storage or shipment. 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 are the property of their respective owners. Typical a T 5V Typical Switchover Waveforms WALL V1 OUT OUT ADAPTER C1 1M 1M 1M 10F ADJ CMPOUT1 V1UV 237k V2 2V/DIV CMP1 CMPOUT2 V2UV V1 121k LTC4419 2V/DIV OUT SWITCHOVER C = 10F OUT V2 V2ON V2ON THRESHOLD I = 100mA LOAD + 7.4V SWITCHOVER 4.02M 4419 TA01b Li-Ion THRESHOLD: V1 < 4V (V1 FALLING) 50s/DIV CMP2 V1UV THRESHOLD: V1 < 4.4V (V1 FALLING) GND 280k V2UV THRESHOLD: V2 < 6V (V2 FALLING) 4419 TA01a 4419f 1 For more information www.linear.com/LTC4419 ion pplica ions pplica ion uresLTC4419 a Te Maxi Mu M r a T (Notes 1, 2) Input Supply Voltage Pin Currents (Note 2) V1, V2 ......................................................15V to 24V ADJ, CMP1, CMP2, CMPOUT1, CMPOUT2, OUT ....................................................... 0.3V to 24V V2ON .................................................................1mA OUT V2 .................................................24V to 39V Operating Ambient Temperature Range OUT V1 .................................................24V to 39V LTC4419C ................................................ 0C to 70C Input Voltages LTC4419I .............................................40C to 85C ADJ, CMP1, CMP2 (Note 3) .................. 0.3V to 24V Junction Temperature (Notes 4, 5) ........................ 125C Output Voltages Storage Temperature Range .................. 65C to 150C CMPOUT1, CMPOUT2, V2ON (Note 3) .. 0.3V to 24V Lead Temperature (Soldering, 10 sec) MSOP Package .................................................300C p in c F T TOP VIEW TOP VIEW V1 1 12 V2 V1 1 10 V2 NC 2 11 NC CMP1 2 9 CMP2 11 CMP1 3 13 10 CMP2 ADJ 3 8 OUT GND GND ADJ 4 9 OUT GND 4 7 V2ON GND 5 8 V2ON CMPOUT1 5 6 CMPOUT2 CMPOUT1 6 7 CMPOUT2 MSE PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 40C/W JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB o r Der i n F Ma T (