Click here for production status of specific part numbers. MAX16545B Integrated Protection IC on 12V Bus with an Integrated MAX16545C MOSFET, Lossless Current Sensing, and PMBus Interface General Description Benefits and Features The MAX16545B/C is a circuit-breaker protection IC with an High Density (6.5mm x 4mm for 60A): Less than 25% integrated low-resistance MOSFET and lossless current-sense of the Board Area of Conventional Solutions circuitry featuring PMBus/SMBus control and reporting. The Monolithic Integration of Power, Control, and IC is designed to provide the optimum solution for distribution, Monitoring (Integrated Power MOSFET with control, monitoring and protection of the systems 12V power 0.95m Total Resistance in 12V Power Path (R ), Including Package) supply. An internal LDO provides the bias supply voltage for DSON the protection IC. Integrated Lossless, Precise Current Sensing Integrated LDO Provides V Supply (1.8V Bias If no fault is detected, the MAX16545B/C initiates the startup. DD Supply) The device has been designed to provide controlled, monotonic startup. Programmable soft-start ramp and delay is implemented Enables Advanced System Power Management to limit the inrush current during startup. The MAX16545B is set PMBus/SMBus Telemetry with Extensive Status for 16A Startup OCP, and the MAX16545C is set for 24A Startup Monitoring and Reporting OCP. Load Current Indicator (ILOAD) Pin Provides Ana- The IC monitors the current and the voltage of the 12V system log Output Current Reporting With High Accuracy power rail and provides multiple levels of protection with fast Programmable Soft-Start for Inrush Current turn off if a fault is detected. Three methods of overcurrent Limiting protection are provided. Programmable moderate OCP level Increases Power-Supply Reliability with IC Self- allows surge currents for a limited time. User-selectable severe Protection Features OCP level provides a fast disconnect if a current exceeding Very Fast Fault Detection and Isolation the severe OCP threshold is detected. An additional fixed high V to V Short Protection During Startup IN OUT shutdown OCP level provides instantaneous disconnect to Overtemperature Protection further protect the device. Three Levels of Overcurrent Protection The lossless current sense provides high-accuracy current Programmable Moderate OCP Programmable Severe OCP Provides Isolation sensing over load and temperature, improving overall system < 5s. energy efficiency, and reducing dissipation. A signal proportional Fail-Safe Safe OCP Provides Isolation < 250ns. to the load current is reported through an analog output and extensive reporting is provided through the SMBus/PMBus. Applications Output voltage is monitored at all times. If at any time the Servers, Networking, Storage, Communication Equipment output voltage falls below the programmable output undervolt- and AC/DC Power Supplies age lockout threshold, the PWRGD signal is asserted low. If at any time the input voltage falls below the programmable Integrated Protection IC on 12V: Circuit Breaker, Hot Swap, Inrush Control input undervoltage lockout threshold, the PWRGD signal is asserted low. The MAX16545B/C can be programmed through PMBus to provide input overvoltage protection. Input overvoltage protection is disabled by default. When enabled through PMBus, if the input voltage exceeds a programmable Ordering Information appears at end of data sheet. overvoltage threshold, the MOSFET is latched off and a fault is communicated. The IC is used to distribute and control power to a system from the +12V power supply. See Basic Application Circuit. PMBus is a trademark of SMIF, Inc. 19-8779 Rev 4 6/19MAX16545B Integrated Protection IC on 12V Bus with an Integrated MAX16545C MOSFET, Lossless Current Sensing, and PMBus Interface Basic Application Circuit SOFT-START PROGRAMMING 12V SS V V IN OUT POWER SUPPLY MAX16545B MAX16545C EN/UVLO PWRGD ENABLE FAULT OUTPUT LOAD PMB US ROCP GND ILOAD SYSTEM CONTROLLER MODERA TE CURRENT OCP REPORTING PROGRAMMING Maxim Integrated 2 www.maximintegrated.com