Click here to ask about the production status of specific part numbers. MAX17701 4.5V to 60V, Synchronous Step-Down Supercapacitor Charger Controller General Description Benefits and Features The Himalaya series of voltage regulator ICs, power mod- Optimized Feature Set for Supercapacitor Charging ules, and chargers enable cooler, smaller, and simpler 4% Charging Current Regulation Accuracy power supply solutions. The MAX17701 is a high efficien- 6% Charging Current Monitor Accuracy (ISMON) cy, high voltage, Himalaya synchronous, step-down, su- 1% Voltage Regulation Accuracy percapacitor charger controller designed to operate over Programmable CC Mode Charging Current (ILIM) an input-voltage range of a 4.5V to 60V. The MAX17701 Wide 4.5V to 60V Input-Voltage Range operates over a -40C to +125C industrial temperature Adjustable Output-Voltage Range from 1.25V Up range and charges a supercapacitor with a 4% accurate To (V - 2.1V) DCIN constant current. After the supercapacitor is charged, the 125kHz to 2.2MHz Adjustable Frequency with device regulates the no-load output voltage with 1% ac- External Clock Synchronization (RT/SYNC) curacy. The output voltage is programmable from 1.25V Reliable Operation in Adverse Environmental up to (V - 2.1V). DCIN Conditions The MAX17701 supercapacitor charger controller is de- Input Short-Circuit Protection (GATEN) signed to provide a holistic application solution requiring Safety Timer Feature (TMR) backup energy storage with a precise charging capability. Output Overvoltage Protection (OVI) The device uses an external nMOSFET to provide input Cycle-by-Cycle Overcurrent Limit supply-side short-circuit protection thus, preventing su- Programmable EN/UVLO Threshold percapacitor discharge. Status Output Monitoring Using Open-Drain Outputs (FLG1 and FLG2) The MAX17701 provides a safety timer (TMR) feature to Overtemperature Protection set the maximum allowed constant current (CC) mode Wide -40C to +125C Ambient Operating charging time. The device features an uncommitted com- Temperature Range/ -40C to +150C Junction parator, which can be used to detect an output over- Temperature Range voltage event (OVI) and prevent the supercapacitor from overcharging. The MAX17701 is available in a 24-pin Ordering Information appears at end of data sheet. 4mm x 4mm TQFN package with an exposed pad. Applications Peak Power Delivery and Energy Storage Backup Power for Industrial Safety Ride-Through Last-Gasp Supplies Portable Medical Equipment Building and Home Automation Backup Power Simplified Application Circuit SSUUPPEERRCCAAPPAACCIITTOORR CCHHAARRGGIINNGG PPRROOFFIILLEE WWIITTHH 1100AA LLOOAADD UP TO 60V V OUT CCVV MMOODDEE C IN 11VV//DDIIVV DCIN GATEN V IN V OUT CCCC MMOODDEE DH FB SUPERCAPACITOR L R S LX ISMON V I OUT CHG SYSTEM MMAAXX1177770011 55AA//DDIIVV DL LOAD VV OOUUTT PGND OVI II FLG2 CCHHGG CSP FLG1 CSN TIME SCALE: 20s/DIV 19-100772 Rev 3 3/21MAX17701 4.5V to 60V, Synchronous Step-Down Supercapacitor Charger Controller Absolute Maximum Ratings V to SGND/EP..................................................... -0.3V to +65V BST to PGND..........................................................-0.3V to +70V IN DCIN to SGND/EP....................... -0.3V to min(+65V, V + 0.6V) DL to PGND................................................ -0.3V to (V + 0.3V) IN CC GATEN to SGND/EP.... max(-0.3V, DCIN - 0.3V) to (DCIN + 6V) DH to LX .................................................... -0.3V to (BST + 0.3V) GATEN to DCIN ....................................................... -0.3V to +6V EXTVCC to SGND/EP ............................................-0.3V to +26V V to SGND/EP .......................... -0.3V to min(+6V, V + 0.3V) PGND, IC1 to SGND/EP........................................-0.3V to +0.3V CC IN CSN, CSP to SGND/EP .............................. -0.3V to (V + 0.6V) Continuous Power Dissipation (TA = +70C) (TQFN (derate IN CSP to CSN .......................................................... -0.3V to +0.3V 27.85mW/C above +70C)) ...........................................2222mW V , TMR, ILIM to SGND/EP................... -0.3V to (V + 0.3V) Operating Temperature Range (Note 1) .............-40C to +125C REF CC COMP, ISMON, RT/SYNC to SGND/EP.... -0.3V to (V + 0.3V) Junction Temperature.......................................................+150C CC OVI, FB to SGND/EP ............................................... -0.3V to +6V Storage Temperature Range ..............................-65C to +150C FLG1, FLG2, EN/UVLO to SGND/EP ...................... -0.3V to +6V Lead Temperature (soldering, 10s)...................................+300C LX to PGND............................................................ -0.3V to +65V Soldering Temperature (reflow) ........................................+260C BST to LX ................................................................. -0.3V to +6V 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 24 PIN TQFN Package Code T2444+5C Outline Number 21-100405 Land Pattern Number 90-100139 Thermal Resistance, Four-Layer Board: Junction to Ambient ( ) 36C/W JA Junction to Case ( ) 3C/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. 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. Electrical Characteristics (V = V = 24V, C = 4.7F, C = 100nF, C = 4.7F, C = 100nF, C = 470nF, V = V = V = IN DCIN VIN DCIN VCC VREF BST EXTVCC SGND/EP PGND V = V = V = 0V, V = V = V = V = V = V = 2.5V, V to V = 5V, RT/SYNC = DH = DL = GATEN FB OVI IC1 EN/UVLO LX TMR ILIM CSN CSP BST LX = COMP = FLG1 = FLG2 = ISMON = Unconnected, T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C. A A All voltages are referenced to SGND/EP, unless otherwise noted.) (Note 2 ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLY DCIN connected to V , External IN 4.5 60 nMOSFET not used DCIN Voltage Range V External nMOSFET used 5.5 60 V Voltage Range 4.5 60 V IN Input Quiescent Current I (V - V ) > 2.1V, V = 1.5V 1.4 2.1 2.8 mA QNS IN CSN FB Input Switching Current I 1.7 2.5 3.5 mA QS Shutdown Supply I V = 0V (Shutdown mode) 7 18 A IN-SH EN/UVLO Current www.maximintegrated.com Maxim Integrated 2