EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX17644 4.5V to 36V, 2.7A, 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 MAX17644 is a high-efficien- Internal Compensation Components cy, high-voltage, Himalaya synchronous step-down DC- All-Ceramic Capacitors, Compact Layout DC converter with integrated MOSFETs operating over an Reduces Number of DC-DC Regulators to Stock input-voltage range of 4.5V to 36V. The device can deliver Wide 4.5V to 36V Input up to 2.7A of current. The MAX17644 is available in three Adjustable Output Voltage Range from 0.9V up to variants: MAX17644A, MAX17644B, and MAX17644C. 90% of V IN The MAX17644A and MAX17644B are fixed 3.3V and Delivers up to 2.7A Over the Temperature Range fixed 5V output parts, respectively. The MAX17644C is 400kHz to 2.2MHz Adjustable Frequency with an adjustable output voltage (from 0.9V up to 90% of External Clock Synchronization V ) part. Built-in compensation across the output-voltage IN Available in a 16-Pin, 3mm x 3mm TQFN Package range eliminates the need for external compensation com- Reduces Power Dissipation ponents. Peak Efficiency of 95.41% The MAX17644 features peak-current mode control archi- PFM and DCM Modes Enable Enhanced Light- tecture. The device can be operated in the forced pulse- Load Efficiency width modulation (PWM), or pulse-frequency modulation Auxiliary Bootstrap Supply (EXTVCC) for Improved (PFM), or discontinuous-conduction mode (DCM) to en- Efficiency able high efficiency under full-load and light-load condi- 2.8A Shutdown Current tions. The MAX17644 offers a low minimum on-time that Operates Reliably in Adverse Industrial Environments allows high switching frequencies and a smaller solution Hiccup-Mode Overload Protection size. Adjustable and Monotonic Startup with Prebiased The feedback-voltage regulation accuracy over -40C to Output Voltage +125C for the MAX17644A/MAX17644B/MAX17644C is Built-in Output-Voltage Monitoring with RESET 1.2%.The device is available in a 16-pin (3mm x 3mm) Programmable EN/UVLO Threshold TQFN package. Simulation models are available. Overtemperature Protection CISPR32 Class B Compliant Applications Wide -40C to +125C Ambient Operating Industrial Control Power Supplies Temperature Range / -40C to +150C Junction General-Purpose Point-of-Load Temperature Range Distributed Supply Regulation Base Station Power Supplies Ordering Information appears at end of data sheet. Wall Transformer Regulation High Voltage Single-Board Systems Simplified Application Circuit V IN C IN RT VIN EN/UVLO BST MODE/SYNC L LX VOUT V CC MMAAXX1177664444BB C OUT PGND SGND SS EXTVCC RESET EP FB 19-101002 Rev 0 3/21MAX17644 4.5V to 36V, 2.7A, High-Efficiency, Synchronous Step-Down DC-DC Converter Absolute Maximum Ratings V to PGND ........................................................... -0.3V to +40V PGND to SGND .....................................................-0.3V to +0.3V IN EN/UVLO to SGND ........................................-0.3V to V + 0.3V LX Total RMS Current ..........................................................3.5A 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) (T = +70C, A BST to PGND ...................................................... -0.3V to +46.5V derate 23.10mW/C above +70C.) ...........................1847.60mW BST to LX .............................................................. -0.3V to +6.5V Operating Temperature Range (Note 1) .............-40C to +125C BST to V ............................................................. -0.3V to +40V Junction Temperature .......................................................+150C CC RESET, SS, MODE/SYNC, V , RT to SGND ..... -0.3V to +6.5V Storage Temperature Range ..............................-65C to +150C CC FB to SGND (MAX17644A & MAX17644B) .......... -5.5V to +6.5V Lead Temperature (soldering, 10s) ...................................+300C FB to SGND (MAX17644C) ................................... -0.3V to +6.5V Soldering Temperature (reflow) ........................................+260C Note 1: Junction temperature greater than +125C degrades operating lifetimes. 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 16 PIN TQFN Package Code T1633+5C Outline Number 21-0136 Land Pattern Number 90-0032 THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2) Junction to Ambient ( ) 33C/W JA Junction to Case ( ) 4C/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 2: Package thermal resistances were obtained using the MAX17644 evaluation kit with no airflow. Electrical Characteristics (V = V = 24V, R = unconnected (f = 400 kHz), C = 2.2F, V = V = V = V = 0V, V IN EN/UVLO RT SW VCC MODE/SYNC EXTVCC SGND PGND FB = 3.67V (MAX17644A), V = 5.5V (MAX17644B), V = 1V (MAX17644C), LX = SS = RESET = unconnected, V to V = 5V, T FB FB BST LX A = -40C to 125C, unless otherwise noted. Typical values are at T = +25C. All voltages are referenced to SGND, unless otherwise A noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (V ) IN Input-Voltage Range V 4.5 36 V IN Input-Shutdown Current I V = 0V (Shutdown mode) 2.8 4.5 A IN-SH EN/UVLO www.maximintegrated.com Maxim Integrated 2