UCS2112 USB Dual-Port Power Switch and Current Monitor Features Description Dual-Port Power Switches: The UCS2112 is a dual USB port power switch configuration which can provide 3.0A continuous - 2.9V to 5.5V source voltage range current (3.4A maximum) per V port with precision BUS - 3.0A continuous current per V port with BUS overcurrent limiting (OCL), port power switch enables, 40 m On resistance per switch auto-recovery fault handling, undervoltage and - Independent port power switch enable pins overvoltage lockout, back-drive protection and - DUAL fault ALERT active drain output pins back-voltage protection, and dynamic thermal - Constant Current or Trip mode current management. limiting behaviors The UCS2112 is well suited for both stand-alone and 2 - Undervoltage and overvoltage lockout applications having SMBus/I C communications. - Back-drive, back-voltage protection For applications with SMBus, the UCS2112 provides - Auto-recovery fault handling with low test per-port current monitoring and eight programmable current current limits per switch, ranging from 0.53A to 3.0A - BOOST logic output to increase DC-DC continuous current (3.4A maximum). Per-port charge converter output under large load conditions rationing is also provided ranging from 3.8 mAh to - A DET open-drain outputs for device attach 246.3 Ah. detection per port In Stand-alone mode, the UCS2112 provides eight 2 SMBus 2.0/I C Mode Features: current limits for both switches, ranging from 0.53A+0.53A to 3A+3A total continuous current - Eight programmable current limits assignable to each power switch (see Table 1-1). - Other SMBus addresses available upon Both power switches include an independent V BUS request discharge function and constant current mode current limiting for BC1.2 applications. - Block read and block write Self-contained current monitoring (no external The UCS2112 is available in a 4x4 mm 20-pin QFN sense resistor required) package. Fully programmable per-port charge rationing and behaviors Package Type Per-port BC1.2 V Discharge Function BUS UCS2112 Wide Operating Temperature Range: 4x4 QFN* - -40C to +105C UL recognized and EN/IEC 60950-1 (CB) certified. 20 19 18 17 16 PWR EN1 PWR EN2 1 15 14 A DET 1 A DET 2 2 EP 13 COMM ILIM BOOST 3 21 12 V V BUS1 4 BUS2 11 V V 5 BUS2 BUS1 67 8 9 10 * Includes Exposed Thermal Pad (EP) see Table 3-1. 2015 - 2017 Microchip Technology Inc. DS20005424C-page 1 ALERT 1 V S GND V S SMDATA V DD SMCLK V S ALERT 2 V SUCS2112 Block Diagram V BUS V S Power Switch 1 UVLO, OVLO V S V BUS Power Switch 2 V BUS PWR EN1 discharge ALERT 1 Charger A DET 1 Control, Temp. Measurement, PWR EN2 OCL BOOST ALERT 2 A DET 2 V DD COMM ILIM SMCLK SMDATA GND DS20005424C-page 2 2015 - 2017 Microchip Technology Inc. Interface Logic