EVALUATION KIT AVAILABLE MAX20751 Multiphase Master with PMBus Interface and Internal Buck Converter General Description Benefits and Features The MAX20751 PMBus-compliant multiphase Increased Power Density with Fewer External master IC, with extensive status and parameter monitor- Components Needed ing, is capable of driving up to four smart-slave integrated Scalable, Multiphase Solution power devices. Compatibility with Coupled Inductors Enables Fast Transient Response and Reduced C OUT Utilizing Maxims smart-slave ICs, the device Integrated Internal Switching Regulator to Power provides a high-density and flexible solution that can be Smart Slaves tailored to a range of power loads used in commu- Optimized Component Performance and Efficiency nication equipment. Proprietary-coupled inductors, with Reduced Design-In Time recommended to reduce the effective inductor value with- PMBus-Compliant Interface for Telemetry and out excessive ripple current, results in improved transient Power Management response and reduction in the number of output capaci- Field-Programmable Memory to Allow Storage of tors required. Desired Configuration Parameters The device incorporates current reporting, tempera- Fault Logging ture monitoring, fault detection, and PMBus support. Comprehensive System and IC Self-Protection Overcurrent and overtemperature faults are detected Features Promote Increased Power-Supply Reliability by the individual smart slaves and faults communicated Overcurrent and Overtemperature through the master IC. The highest junction temperature Boost Voltage UVLO is reported, both before and after smart-slave regulation. VX Short to Ground or V Detection DDH The device features an integrated switching regulator Phase-Current Steering for Thermal Balancing 36-Pin (6mm x 6mm) QFN Package that can optionally be used to supply the V rail for the DD master controller and smart-slave devices to reduce the power-rail requirements and simplify the regulator design. Applications PWM1 Smart Communication, Networking, Servers, and Storage ISENSE1 Slave Equipment PWM2 ASICs Smart Microprocessor Chipsets ISENSE2 Slave V OUT TS FAULTB Memory V DDQ Power PMBus Other High-Current Digital ICs Management MAX20751 PWM3 COntroller Smart ISENSE3 Slave Ordering Information appears at end of data sheet. PWM4 Smart ISENSE4 Slave PMBus is a trademark of SMIF, Inc. SENSE N SENSE P Figure 1. Basic Application Circuit 19-7080 Rev 2 3/15MAX20751 Multiphase Master with PMBus Interface and Internal Buck Converter Absolute Maximum Ratings V Supply Voltage...............................................-0.3V to +4V SENSE P.................................................................-0.3V to +4V DD33 VIN UV, VR ON and PWRGD Pins.........................-0.3V to +4V R REF, MRAMP, R SELx, PWMx, TS FAULTB, ISENSEx, V Supply Voltage ...............................................-0.3V to +2.5V A1 OUT, A2 x, A2B OUT, A3 x ...............-0.3 to V + 0.3V DD DD PVX to PGND...........................................-0.6V to V + 0.6V Junction Temperature (T ) ...............................................+150C DD33 J PMBus Pins (PMD, PMC, ALERTB).........................-0.3V to +6V Storage Temperature Range..............................-65C to +150C SENSE N .....................................................-0.3V to V +0.3V Peak Reflow Temperature................................................+260C DD Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Operating Ratings V Supply Voltage .....................................+2.97V to +3.63V SENSE N .............................................................-0.1V to +0.2V DD33 V Supply Voltage ........................................+1.71V to +1.98V SENSE P .............................................................-0.1V to +2.5V DD VIN UV, VR ON and PWRGD ............................-0.1V to +3.6V Junction Temperature Range (T ).......................-40C to +125C J PMBus Pins (PMD, PMC, ALERTB) ....................-0.1V to +5.5V Package Thermal Characteristics TQFN Junction-to-Case Thermal Resistance ( ) ..............1.7C/W JC This product is completely Halogen-free and Pb-free, employing SnAgCu solder balls. The product is RoHS compliant with an -e1 termina- tion finish and is compatible with both SnPb and Pb-free soldering operations. The product is MSL classified at peak reflow temperatures that meet JEDEC JSTD-020. Electrical Characteristics (V = 1.71V to 1.98V, V = 3.3V 10%, T = +25C, unless otherwise noted.) DD DD33 J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY VOLTAGES AND CURRENTS Supply Voltage Range V If external V supply is used 1.71 1.86 1.98 V DD DD Supply Current I PWM not switching (Note 2) 14 17 20 mA DD 3.3V Supply Voltage Range V 2.97 3.30 3.63 V DD33 No load, internal integrated 3.3V Supply Current I switcher disabled, PMBus idle 24 130 A DD33 (Note 2) V UVLO (UNDERVOLTAGE LOCKOUT) DD Supply Voltage Undervoltage- V (Note 2) 1.62 1.66 V DD UVLO RIS Lockout Rising Threshold Supply Voltage Undervoltage- V (Note 2) 1.58 1.60 V DD UVLO FAL Lockout Falling Threshold V UVLO DD33 3.3V Supply Voltage Undervoltage- V (Note 2) 2.90 2.95 V DD33 UV RIS Lockout Rising Threshold 3.3V Supply Voltage Undervoltage- V (Note 2) 2.80 2.85 V DD33 UV FAL Lockout Falling Threshold Maxim Integrated 2 www.maximintegrated.com