EVALUATION KIT AVAILABLE MAX20745 Integrated, Step-Down Switching Regulator General Description Benefits and Features The MAX20745 is a fully integrated, highly efficient High Power Density and Low Component Count 2 switching regulator for applications operating from 4.5V to Overall Solution Size: 509mm Including Inductor 16V and requiring up to 25A maximum load. This single- and Output Capacitors chip regulator provides extremely compact, high-efficien- 90.8% Peak Efficiency: V = 12V and DDH cy power-delivery solutions with high-precision output V = 1V OUT voltages and excellent transient response for networking, Fast Transient Response: Supports Up to 300A/s datacom, and telecom equipment. Load-Step Transients The IC offers a broad range of programmable features Optimized Component Performance and Efficiency through capacitors and resistors connected to dedicated with Reduced Design-In Time programming pins. Using this feature, the operation can Increased Power-Supply Reliability with System and be optimized for a specific application, reducing the IC Self-Protection Features component count- and/or setting-appropriate trade-offs Differential Remote Sense with Open-Circuit between the regulator s performance and system cost. Detection Ease of programming enables using the same design for Hiccup Overcurrent Protection multiple applications. Programmable Thermal Shutdown The MAX20745 includes protection capabilities. Positive and negative cycle-by-cycle overcurrent protection and overtemperature protection ensure a rugged design. Input Typical System Efficiency vs. undervoltage lockout shuts down the device to prevent Load Current (V = 12V) DDH operation when the input voltage is out of specification. A status pin provides an output signal to show that the out- 100 put voltage is within range and the system is regulating. 95 90 Applications Communications Equipment 85 80 Networking Equipment 75 Servers and Storage Equipment VoVut = 5V= 5V OUT 70 Vout = 3.3V V = 3.3V Point-of-Load Voltage Regulators OUT VouVt = 1.8V= 1.8V OUT 65 P Chipsets VouVt = 1.2V= 1.2V OUT 60 Vout = 1V V = 1V OUT Memory VDDQ Vout = 0.8V V = 0.8V OUT 55 Vout = 0.65V V = 0.65V OUT I/O 50 0 5 10 15 20 25 CURRENT INPUT OUTPUT DESCRIPTION I (A) RATING* VOLTAGE VOLTAGE OUT 0.6484V Electrical rating 25A 4.5V to 16V to 5.5V Thermal rating, 25A 12V 1V T = 55C, 200LFM A Thermal rating, 15A 12V 1V T = 85C, 0LFM A *For specific operating conditions, refer to the SOA curves in Ordering Information appears at end of data sheet. the Typical Operating Characteristics section. 19-8588 Rev 1 4/20 EFFICIENCY (%)MAX20745 Integrated, Step-Down Switching Regulator Absolute Maximum Ratings Input Pin Voltage (V ) (Note 1) ........................-0.3V to +18V Switching Node Voltage (VX) 25ns (Note 2) ..........-10V to +23V DDH V ..........................................................................-0.3V to +2V (BST - VX) Pin Differential ..................................... -0.3 to +2.5V CC OE ........................................................................-0.3V to 15.5V Junction Temperature (T ) ...............................................+150C J STAT Pin Voltage.....................................................-0.3V to +4V Storage Temperature Range ............................ -65C to +150C PGM1, PGM2, PGM3, V and V Peak Reflow Temperature Lead-Free .............................+260C SENSE+ SENSE- Pin Voltages .........................................................-0.3V to +2V Switching Node Voltage (VX) DC ..........................-0.3V to +18V Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only 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 (I ) (Note 3) .................6A DDH VDDH Junction Temperature (T ) ............................... -40C to +125C Maximum Average Output Current (I ) ............................25A J OUT Peak Output Current (I ) .....................................................50A PK Package Information 15 FCQFN Package Code P154A6F+ Outline Number 21-100020 Land Pattern Number 90-100021 THERMAL RESISTANCE, FOUR-LAYER BOARD Junction to Ambient ( ) JA 16.3C/W (Still Air, No Heatsink Note 4) Junction to Case ( ) 0.62C/W JC 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 can 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, MAX20745EVKIT . The PCB has four layers of 2oz copper. Maxim Integrated 2 www.maximintegrated.com