LTC4418 Dual Channel Prioritized PowerPath Controller FEATURES DESCRIPTION n Selects Highest Priority Supply from Two Inputs The LTC 4418 connects one of two valid power supplies n Blocks Reverse and Cross Conduction Currents to a common output based on priority and validity. Priority n Wide Operating Voltage Range: 2.5V to 40V is defined by pin assignment, with V1 assigned the higher n 42V Protection Against Reverse Connection priority and V2 the lower priority. A power supply is defined n 60V Tolerant V1, V2 Inputs as valid when its voltage has been within its overvoltage n Adjustable Input Validation Time (OV) and undervoltage (UV) window continuously for at n Fast Switchover Minimizes Output Voltage Droop least the configured validation time. If the highest priority n Low 26A Operating Current valid input falls out of the OV/UV window, the channel is n 1.5% Input Overvoltage/Undervoltage Protection immediately disconnected and the other valid input is con- n Adjustable Overvoltage/Undervoltage Hysteresis nected to the common output. Multiple LTC4418s, as well n Cascadable for Additional Input Supplies as triple channel LTC4417s, can be cascaded to provide n 20-Lead 4mm 4mm QFN Package switchover between more than two inputs. The LTC4418 incorporates fast non-overlap switching circuitry to prevent both reverse and cross conduction APPLICATIONS while minimizing output droop. The gate driver includes n Industrial Handheld Instruments a 6V clamp to protect external MOSFETs. A controlled n High Availability Systems soft-start feature minimizes start-up inrush current. Open n Battery Backup Systems drain VALID outputs indicate the input supplies have been n Servers and Computer Peripherals within their OV/UV window for the duration of the valida- All registered trademarks and trademarks are the property of their respective owners. tion time. The validation time can be disabled or adjusted using an external capacitor. TYPICAL APPLICATION FDS4465 M1 M2 5V SYS 1.25A MAX OUTPUT + 82F Priority Switching from V1 to V2 FDS4465 M3 M4 12V WALL ADAPTER 13.8V 47nF V2 2V/DIV 100nF 470nF 698 BAT46WJ VS1 G1 VS2 G2 V OUT V1 V OUT 1M 100k 100k UV1 5V 60.4k V1 VALID1 2V/DIV OV1 VALID2 226k LTC4418 I = 1.25A CAS LOAD C = 82F OUT V2 INTV CC 1M 4418 TA01b EN 2ms/DIV UV2 33.2k SHDN OV2 GND HYS TMR 78.7k 4418 TA01a 1nF 100nF 255k Rev A 1 Document Feedback For more information www.analog.comLTC4418 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) Supply Voltages TOP VIEW V1, V2 ..................................................... 42V to 60V V ....................................................... 0.3V to 42V OUT 20 19 18 17 16 VS1, VS2 ................................................ 0.3V to 60V TMR 1 15 V OUT Voltage from V1, V2 to V ....................... 84V to 60V OUT UV1 2 14 VS1 GND Voltage from VS1, VS2 to G1, G2 ...............0.3V to 7.5V G1 OV1 3 13 21 4 VS2 UV2 12 Input Voltages OV2 5 11 G2 EN, SHDN .............................................. 0.3V to 60V 6 7 8 9 10 OV1, OV2, UV1, UV2, TMR....................... 0.3V to 6V HYS ......................................................... 0.3V to 1V INTV .................................................. 0.3V to 6.2V UF PACKAGE CC 20-LEAD (4mm 4mm) PLASTIC QFN Output Voltages T = 150C, = 47C/W, = 4.5C/W JMAX JA JC EXPOSED PAD (PIN 21), PCB GND CONNECTION OPTIONAL VALID1, VALID2 ...................................... 0.3V to 60V CAS .......................................................... 0.3V to 6V Input Currents OV1, OV2, UV1, UV2, HYS, TMR, INTV , EN, SHDN ............................................ 3mA CC Output Currents VALID1, VALID2, CAS ..............................2mA/+5mA Operating Ambient Temperature Range LTC4418C ................................................ 0C to 70C LTC4418I .............................................40C to 85C Storage Temperature Range .................. 65C to 150C ORDER INFORMATION