EVALUATION KIT AVAILABLE MAX20735 Integrated, Step-Down Switching Regulator General Description Benefits and Features The MAX20735 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 40A maximum load. This single- and Output Capacitors chip regulator provides extremely compact, high-efficien- 90.7% 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 MAX20735 includes protection capabilities. Positive Typical System Efficiency vs. and negative cycle-by-cycle overcurrent protection and overtemperature protection ensure a rugged design. Input Load Current (V = 12V) DDH undervoltage lockout shuts down the device to prevent 100 operation when the input voltage is out of specification. A 95 status pin provides an output signal to show that the out- 90 put voltage is within range and the system is regulating. 85 Applications 80 75 V = 5V Communications Equipment VoutOU = 5VT VouV t = 3.3V= 3.3V OUT 70 V = 1.8V Networking Equipment Vout = 1.8V OUT 65 V = 1.2V VouOUt = 1T.2V V = 1V Servers and Storage Equipment Vout = 1V OUT 60 V = 0.8V VouOUt = 0T.8V V = 0.65V Point-of-Load Voltage Regulators 55 Vout = 0.65V OUT 50 P Chipsets 0 5 10 15 20 25 30 35 40 I (A) OUT Memory VDDQ I/O CURRENT INPUT OUTPUT DESCRIPTION RATING* VOLTAGE VOLTAGE 0.6484V to Electrical Rating 40A 4.5V to 16V 5.5V Thermal Rating 35A T = 55C, 200 LFM A 12V 1V Thermal Rating 22A T = 85C, 0 LFM A *For specific operating conditions, refer to the SOA curves in Ordering Information appears at end of data sheet. the Typical Operating Characteristics section. 19-8581 Rev 1 5/17 EFFICIENCY (%)MAX20735 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 STAT and OE Pin Voltages .....................................-0.3V to +4V Junction Temperature (T ) ...............................................+150C J PGM1, PGM2, PGM3, V and V Storage Temperature Range ............................ -65C to +150C SENSE+ SENSE- Pin Voltages .........................................................-0.3V to +2V Peak Reflow Temperature Lead-Free .............................+260C 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, 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 (I ) (Note 3) ........6A DDH VDDH 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, FOUR-LAYER BOARD Junction to Ambient ( ) 12C/W (typ) (Note 4) (still air, no heatsink) JA Junction to Case ( ) .42C/W (max) 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. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. 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 Average Input Current Limit section. Note 4: Data taken using Maxims evaluation kit, MAX20735EVKIT . The PCB has four layers of 2oz copper. 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