EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX17632 4.5V to 36V, 2A, High-Efficiency, Synchronous Step-Down DC-DC Converter General Description Benefits and Features The MAX17632 is a high-efficiency, high-voltage, syn- Reduces External Components and Total Cost chronous step-down DC-DC converter with integrated No Schottky - Synchronous Operation MOSFETs operating over an input-voltage range of 4.5V Internal Compensation Components All-Ceramic Capacitors, Compact Layout to 36V. It can deliv er up to 2A current. The MAX17632 is available in three variants, MAX17632A, MAX17632B, Reduces Number of DC-DC Regulators to Stock and MAX17632C. The MAX17632A and MAX17632B are Wide 4.5V to 36V Input fixed 3.3V and fixed 5V output parts, respectively. The Adjustable Output Voltage Range from 0.9V up to MAX17632C is an adjustable output voltage (from 0.9V 90% of V IN up to 90% of V ) part. Built-in compensation across the IN Delivers up to 2A Over the Temperature Range output-voltage range eliminates the need for external 400kHz to 2.2MHz Adjustable Frequency with compensation components. External Clock Synchronization Available in a 16-Pin, 3mm x 3mm TQFN Package The MAX17632 features peak-current-mode control archi- tecture. The device can be operated in the forced pulse- Reduces Power Dissipation width modulation (PWM), or pulse-frequency modulation Peak Efficiency of 94% (PFM), or discontinuous-conduction mode (DCM) to enable PFM and DCM Modes Enable Enhanced Light- high efficiency under full-load and light-load conditions. The Load Efficiency MAX17632 offers a low minimum on-time that allows high Auxiliary Bootstrap Supply (EXTVCC) for Improved switching frequencies and a smaller solution size. Efficiency 2.8A Shutdown Current The feedback-voltage regulation accuracy over -40C to +125C for the MAX17632A/MAX17632B/MAX17632C is Operates Reliably in Adverse Industrial Environments 1.2%.The device is available in a 16-pin (3mm x 3mm) Hiccup-Mode Overload Protection TQFN package. 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 Overtemperature Protection General-Purpose Point-of-Load High Industrial -40C to +125C Ambient Operating Distributed Supply Regulation Temperature Range / -40C to +150C Junction Base Station Power Supplies Temperature Range Wall Transformer Regulation Ordering Information appears at end of data sheet. High Voltage Single-Board Systems Typical Application Circuit V IN 6.5V TO 36V C1 2.2F RT EN/UVLO VIN BST MODE/SYNC C5 0.1F L1 VOUT V LX CC C3 MAX17632B 5V, 2A 10H C4 2.2F SGND FB 22F f : 400kHz SW C1: 2.2F/50V/X7R/1206 (GRM31CR71H225KA88) SS EXTVCC L1: 15H (XAL5050-103ME) C2 EP 5600pF C4: 22F/10V/X7R/1210 (GRM32ER71A226K) RESET PGND MODE: PWM 19-100164 Rev 2 3/19MAX17632 4.5V to 36V, 2A, 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) BST to PGND .....................................................-0.3V to +46.5V (T = +70C, derate 20.8mW/C above +70C.) ....1666.7mW A 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 (MAX17632A & MAX17632B) ...........-5.5V to 6.5V Lead Temperature (soldering, 10s) .................................+300C FB to SGND (MAX17632C) ..................................-0.3V to 6.5V Soldering Temperature (reflow) .......................................+260C 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: 16-PIN TQFN Package Code T1633+5C Outline Number 21-0136 Land Pattern Number 90-0032 THERMAL RESISTANCE, FOUR-LAYER BOARD (N ote 2) Junction to Ambient ( ) 38 C/W JA Junction to Case ( ) 10 C/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 MAX17632 Evaluation Kit. Electrical Characteristics (V = V = 24V, R = unconnected (f = 400 kHz), C = 2.2F, V = V = V = V = 0V, IN EN/UVLO RT SW VCC MODE/SYNC EXTVCC SGND PGND V = 3.67V (MAX17632A), V = 5.5V (MAX17632B), V = 1V (MAX17632C), LX = SS = RESET = Open, V to V = 5V, FB FB FB BST LX T = -40C to 125C, unless otherwise noted. Typical values are at T = +25C. All voltages are referenced to SGND, unless otherwise A 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 MODE/SYNC = Open, V = 5V 50 EXTVCC I A MODE/SYNC = Open, R = 50.8k, Q PFM RT 60 V = 5V EXTVCC Input-Quiescent Current I DCM Mode, V = 0.1V 1.2 1.8 Q DCM LX Normal Switching Mode, f = 400kHz, SW mA I V = 3V (MAX17632A), V = 4.4V 5 Q PWM FB FB (MAX17632B), V = 0.8V (MAX17632C) FB Maxim Integrated 2 www.maximintegrated.com