LTC4417 Prioritized PowerPath™ Controller FeaTuresDescripTion n Selects Highest Priority Supply from Three Inputs The LTC®4417 connects one of three valid power supplies n Blocks Reverse and Cross Conduction Currents to a common output based on priority. Priority is defined n Wide Operating Voltage Range: 2.5V to 36V by pin assignment, with V1 assigned the highest priority n –42V Protection Against Reverse Battery and V3 the lowest priority. A power supply is defined as Connection valid when its voltage has been within its overvoltage (OV) n Fast Switchover Minimizes Output Voltage Droop and undervoltage (UV) window continuously for at least n Low 28µA Operating Current 256ms. If the highest priority valid input falls out of the n <1µA Current Draw from Supplies Less than V OV/UV window, the channel is immediately disconnected OUT n 1.5% Input Overvoltage/Undervoltage Protection and the next highest priority valid input is connected to the n Adjustable Overvoltage/Undervoltage Hysteresis common output. Two or more LTC4417s can be cascaded n P-Channel MOSFET Gate Protection Clamp to provide switchover between more than three inputs. 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 applicaTions a 6V clamp to protect external MOSFETs. A controlled 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 n PowerPath, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other Servers and Computer Peripherals trademarks are the property of their respective owners. Typical applicaTion 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 14.8V V2 V1 VS1 G1 VS2 G2 VS3 G3 12V VOUT 806k VOUT V1 UV1 1M 1M 1M 2V/DIV 39.2k VALID1 OV1 VALID2 60.4k VALID3 V1 UV FAULT V2 V3 = 0V, I 1.05M L = 2A CL = 120µF UV2 LTC4417 31.6k 50ms/DIV 4417 TA01b OV2 68.1k V3 EN 698k SHDN HYS UV3 CAS 16.9k OV3 GND 4417 TA01a 49.9k 4417f 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Timing Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
