EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX17633 4.5V to 36V, 3.5A, High Efficiency, Synchronous Step-Down, DC-DC Converter General Description Benefits and Features The Himalaya series of voltage regulator ICs, power mod- Reduces External Components and Total Cost ules, and chargers enable cooler, smaller, and simpler No Schottky - Synchronous Operation power supply solutions. The MAX17633 is a high-effi- Internal Compensation Components All-Ceramic Capacitors, Compact Layout ciency, high-voltage, Himalaya synchronous step-down DC-DC converter with integrated MOSFETs operating Reduces Number of DC-DC Regulators to Stock over an input voltage range of 4.5V to 36V. It can deliver Wide 4.5V to 36V Input up to 3.5A current. The MAX17633 is available in three Adjustable Output Range from 0.9V up to 90% of V IN variants MAX17633A, MAX17633B, and MAX17633C. Delivers up to 3.5A Over the Temperature Range The MAX17633A and MAX17633B are the fixed 3.3V and 400kHz to 2.2MHz Adjustable Frequency with fixed 5V output voltage parts, respectively. MAX17633C External Clock Synchronization is an adjustable output voltage (from 0.9V up to 90% of Available in a 20-Pin, 4mm 4mm TQFN Package V ) part. Built-in compensation across the output voltage IN Reduces Power Dissipation range eliminates the need for external components. Peak Efficiency > 93% The MAX17633 features peak-current-mode control archi- PFM and DCM Modes Enable Enhanced Light- tecture. The device can be operated in forced pulse-width Load Efficiency modulation (PWM), pulse-frequency modulation (PFM), Auxiliary Bootstrap Supply (EXTVCC) for Improved or discontinuous-conduction mode (DCM) to enable high Efficiency efficiency under full-load and light-load conditions. 2.8A Shutdown Current The feedback-voltage-regulation accuracy over -40C Operates Reliably in Adverse Industrial Environments to +125C for the MAX17633A, MAX17633B, and Hiccup-Mode Overload Protection MAX17633C is 1.3%. Simulation models are available. Adjustable and Monotonic Startup with Prebiased Output Voltage Applications Built-in Output-Voltage Monitoring with RESET Industrial Control Power Supplies Programmable EN/UVLO Threshold General-Purpose Point-of-Load Overtemperature Protection CISPR 22 Class B Compliant Distributed Supply Regulation Wide -40C to +125C Ambient Operating Temper- Base-Station Power Supplies ature Range / -40C to +150C Junction Tempera- ture Range Wall Transformer Regulation High-Voltage Single-Board systems Ordering Information appears at end of data sheet. Typical Application Circuit VIN C1 6.5V TO 36V 2 x 2.2F RT EN/UVLO IN BST MODE/SYNC C5 0.1F L1 VOUT INTVCC LX C3 6.8H C4 5V,3.5A MAX17633B 2.2F SGND EXTVCC 2 x 22F SS FB C2 EP 5600pF RESET PGND fSW = 500kHz 19-100305 Rev 2 7/20MAX17633 4.5V to 36V, 3.5A, High Efficiency, Synchronous Step-Down, DC-DC Converter Absolute Maximum Ratings IN to PGND ...........................................................-0.3V to +40V PGND to SGND.................................................... -0.3V to +0.3V EN/UVLO to SGND ....................................-0.3V to (V + 0.3V) LX Total RMS Current .............................................................4A IN LX to PGND................................................-0.3V to (V + 0.3V) Output Short-Circuit Duration ....................................Continuous IN EXTVCC to SGND ...............................................-5.5V to +6.5V Continuous Power Dissipation (Multilayer Board) BST to PGND .....................................................-0.3V to +46.5V (T = +70C, derate 30.3mW/C above +70C.) ....2424.2mW A BST to LX .............................................................-0.3V to +6.5V Operating Temperature Range (Note1) ...............-40C to 125C BST to INTVCC .....................................................-0.3V to +40V Junction Temperature ....................................... -40C to +150C FB to SGND (MAX17633A & MAX17633B) .........-5.5V to +6.5V Storage Temperature Range ............................ -65C to +150C FB to SGND (MAX17633C) .................................-0.3V to +6.5V Lead Temperature (soldering, 10s) .................................+300C SS, MODE/SYNC, RESET, INTVCC, Soldering Temperature (reflow) .......................................+260C RT to SGND .....................................................-0.3V to +6.5V 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. Package Information PACKAGE TYPE: 20-Pin TQFN Package Code T2044+4C Outline Number 21-100172 Land Pattern Number 90-0409 THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2) Junction to Ambient ( ) 26C/W JA Junction to Case ( ) 2C/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: Junction temperature greater than +125C degrades operating lifetimes. Note 2: Package thermal resistances were obtained using the MAX17633 Evaluation Kit with no airflow. Maxim Integrated 2 www.maximintegrated.com