LTC4417 Prioritized PowerPath Controller Fea T Descrip T n Selects Highest Priority Supply from Three Inputs The LTC 4417 connects one of three valid power supplies n to a common output based on priority. Priority is defined Blocks Reverse and Cross Conduction Currents n by pin assignment, with V1 assigned the highest priority Wide Operating Voltage Range: 2.5V to 36V n and V3 the lowest priority. A power supply is defined as 42V Protection Against Reverse Battery valid when its voltage has been within its overvoltage (OV) Connection n and undervoltage (UV) window continuously for at least Fast Switchover Minimizes Output Voltage Droop n 256ms. If the highest priority valid input falls out of the Low 28A Operating Current n OV/UV window, the channel is immediately disconnected <1A Current Draw from Supplies Less than V OUT n and the next highest priority valid input is connected to the 1.5% Input Overvoltage/Undervoltage Protection n common output. Two or more LTC4417s can be cascaded Adjustable Overvoltage/Undervoltage Hysteresis n to provide switchover between more than three inputs. P-Channel MOSFET Gate Protection Clamp n Cascadable for Additional Input Supplies The LTC4417 incorporates fast non-overlap switching n 24-Lead Narrow SSOP and 4mm 4mm QFN circuitry to prevent both reverse and cross conduction Packages while minimizing output droop. The gate driver includes a 6V clamp to protect external MOSFETs. A controlled a T output ramp feature minimizes start-up inrush current. n Industrial Handheld Instruments Open drain VALID outputs indicate the input supplies have n High Availability Systems been within their OV/UV window for 256ms. n Battery Backup Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other n Servers and Computer Peripherals trademarks are the property of their respective owners. Typical a T V1: 12V IRF7324 WALL ADAPTER 2A OUTPUT V2: 14.8V Li-Ion IRF7324 MAIN/SWAPPABLE Priority Switching from 12V V1 to 14.8V V2 V3: 12V SLA IRF7324 BACKUP 14.8V14.8V V2 V1 VS1 G1 VS2 G2 VS3 G3 V 12V OUT V V1 806k OUT UV1 1M 1M 1M 2V/DIV 39.2k VALID1 OV1 VALID2 60.4k V1 UV FAULT VALID3 V2 V3 = 0V, I = 2A L 1.05M C = 120F L UV2 LTC4417 4417 TA01b 31.6k 50ms/DIV OV2 68.1k V3 EN SHDN 698k HYS UV3 CAS 16.9k OV3 GND 4417 TA01a 49.9k 4417f 1 ion pplica ions pplica ion uresLTC4417 a T e Maxi Mu M r a T (Notes 1, 2) Supply Voltages Output Voltages V1, V2, V3 ............................................... 42V to 42V VALID1, VALID2, VALID3 ........................ 0.3V to 42V V , VS1, VS2, VS3 .............................. 0.3V to 42V CAS .......................................................... 0.3V to 6V OUT Voltage from V1, V2, V3 to V ................. 84V to 42V Output Currents OUT Voltage from VS1, VS2, VS3 to VALID1, VALID2, VALID3, CAS .............................2mA G1, G2, G3 ..................................................0.3V to 7.5V Operating Ambient Temperature Range Input Voltages LTC4417C ................................................ 0C to 70C EN, SHDN .............................................. 0.3V to 42V LTC4417I..............................................40C to 85C OV1, OV2, OV3, UV1, UV2, UV3 ............... 0.3V to 6V LTC4417H .......................................... 40C to 125C HYS ......................................................... 0.3V to 1V Storage Temperature Range .................. 65C to 150C Input Currents Lead Temperature OV1, OV2, OV3, UV1, UV2, UV3, HYS ............... 3mA GN Package (Soldering, 10 sec) ........................300C p c F T TOP VIEW EN 1 24 V1 SHDN 2 23 V2 24 23 22 21 20 19 HYS 3 22 V3 UV1 1 18 VS1 UV1 4 21 VS1 OV1 2 17 G1 OV1 5 20 G1 UV2 3 16 VS2 25 UV2 6 19 VS2 OV2 4 15 G2 UV3 OV2 7 18 G2 5 14 VS3 OV3 6 13 G3 UV3 8 17 VS3 OV3 9 16 G3 7 8 9 10 11 12 VALID1 10 15 V OUT VALID2 11 14 CAS UF PACKAGE VALID3 12 13 GND 24-LEAD (4mm 4mm) PLASTIC QFN T = 150C, = 47C/W, = 4.5C/W GN PACKAGE JMAX JA JC EXPOSED PAD (PIN 25) PCB GND CONNECTION OPTIONAL 24-LEAD NARROW PLASTIC SSOP T = 150C, = 85C/W, = 30C/W JMAX JA JC o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4417CGN PBF LTC4417CGN TRPBF LTC4417GN 24-Lead Narrow Plastic SSOP 0C to 70C LTC4417IGN PBF LTC4417IGN TRPBF LTC4417GN 24-Lead Narrow Plastic SSOP 40C to 85C LTC4417HGN PBF LTC4417HGN TRPBF LTC4417GN 24-Lead Narrow Plastic SSOP 40C to 125C LTC4417CUF PBF LTC4417CUF TRPBF 4417 24-Lead (4mm 4mm) Plastic QFN 0C to 70C LTC4417IUF PBF LTC4417IUF TRPBF 4417 24-Lead (4mm 4mm) Plastic QFN 40C to 85C LTC4417HUF PBF LTC4417HUF TRPBF 4417 24-Lead (4mm 4mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: