EVALUATION KIT AVAILABLE MAX20734 Integrated, Step-Down Switching Regulator with PMBus General Description Benefits and Features The MAX20734 is a fully integrated, highly efficient switch- High Power Density and Low Component Count 2 ing regulator with PMBus for applications operating from Overall Solution Size 509mm Including Inductor 4.5V to 16V and requiring up to 40A (max) load. This and Output Capacitors 90.7% Peak Efficiency with V = 12V and V single-chip regulator provides extremely compact, high- DDH OUT efficiency power-delivery solutions with high-precision = 1V Fast Transient Response: Supports Up to 300A/s output voltages and excellent transient response for networking, datacom, and telecom equipment. Load-Step Transients The IC offers a broad range of programmable features Optimized Component Performance and Efficiency with Reduced Design-In Time through either the PMBus or a capacitor and resistor connected to a dedicated programming pin. Using this PMBus-Compliant Interface for Telemetry and Power Management feature, the operation can be optimized for a specific Voltage, Current, and Temperature Reporting application, reducing the component count and/or setting through the Digital Bus appropriate trade-offs between the regulators performance and system cost. Ease of programming enables using the Increased Power-Supply Reliability with System and same design for multiple applications. IC Self-Protection Features Differential Remote Sense with Open-Circuit The IC includes protection and telemetry features. Positive Detection and negative cycle-by-cycle overcurrent protection and Hiccup Overcurrent Protection overtemperature protection ensure a rugged design. Programmable Thermal Shutdown Input undervoltage lockout shuts down the device to prevent operation when the input voltage is out of specification. A status pin provides an output signal to Typical System Efficiency vs. show that the output voltage is within range and the Load Current (V = 12V) DDH system is regulating. Applications 100 Communications Equipment 95 Networking Equipment 90 Servers and Storage Equipment 85 Point-of-Load Voltage Regulators 80 P Chipsets 75 Memory V DDQ V = 5V VoutOU = 5VT I/O 70 V = 3.3V Vout = 3.3V OUT V = 1.8V VouOUt = 1T.8V 65 V = 1.2V VouOUt = 1T.2V 60 V = 1V CURRENT INPUT OUTPUT Vout = 1V OUT DESCRIPTION V = 0.8V VouOUt = 0T.8V RATING* VOLTAGE VOLTAGE 55 V = 0.65V Vout = 0.65V OUT Electrical rating 40A 4.5V to 16V 0.6V to 5.5V 50 0 5 10 15 20 25 30 35 40 Thermal rating, I (A) OUT 35A 12V 1V T = 55C, 200LFM A Thermal rating, 22A 12V 1V T = 85C, 0LFM Order Information appears at end of data sheet. A *For specific operating conditions, refer to the SOA curves in PMBus is a trademark of SMIF, Inc. the Typical Operating Characteristics section. 19-8585 Rev 0 1/17 EFFICIENCY (%)MAX20734 Integrated, Step-Down Switching Regulator with PMBus Absolute Maximum Ratings Input Pin Voltage (V ) (Note 1) ........................-0.3V to +18V Switching Node Voltage (VX) DC ..........................-0.3V to +18V DDH V .........................................................................-0.3V to +2V Switching Node Voltage (VX) 25ns (Note 2) ..........-10V to +23V CC STAT, OE, CLK, DATA, and (BST - VX) Pin Differential ...................................-0.3V to +2.5V SMALERT Pin Voltages .......................................-0.3V to +4V Junction Temperature (T ) ...............................................+150C J PGMA, PGMB, V and Storage Temperature Range ............................ -65C to +150C SENSE+ V Pin Voltages .........................................-0.3V to +2V Peak Reflow Temperature Lead-Free .............................+260C SENSE- 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 Input Voltage (V ) ................................................4.5V to 16V Maximum Average Input Current (V ) (Note 3) .........6A DDH DDH MAX Junction Temperature (T ) ................................ -40C to +125C Maximum Average Output Current (I ) ............................40A J MAX Peak Output Current (I ) .....................................................90A PK Package Information PACKAGE TYPE: 15 FCQFN Package Code P154A9F+1 Outline Number 21-100027 Land Pattern Number 90-100025 THERMAL RESISTANCE Junction to Ambient (JA) 12C/W (Note 4 Still Air, No Heatsink) Junction to Case (JC) 0.42C/W For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Note 1: As measured at the V pin referenced to GND pin immediately adjacent using a high-frequency scope probe with I DDH LOAD at I . A high-frequency input bypass capacitor must be located less than 60 mils from the V pin per our design MAX DDH guidelines. Note 2: The 25ns rating is the allowable voltage on the VX node in excess of the -0.3V to +18V DC ratings. The VX voltage may exceed the DC rating in either the positive or negative direction for up to 25ns per cycle. Note 3: See the Average Input Current Limit section. Note 4: Data taken using Maxims evaluation kit (MAX20734EVKIT ). The PCB has four layers of 2oz copper. Maxim Integrated 2 www.maximintegrated.com