Click here to ask about the production status of specific part numbers. MAX17702 4.5V to 60V, Synchronous Step-Down Lead- Acid Battery Charger Controller General Description Benefits and Features The Himalaya series of voltage regulator ICs, power mod- Optimized Feature-Set for Pb-Acid Batteries ules, and chargers enable cooler, smaller, and simpler 4% Charging Current Regulation Accuracy power supply solutions. The MAX17702 is a high-efficien- 6% Charging Current Monitor Accuracy (ISMON) cy, high-voltage, synchronous, step-down, Himalaya lead- 1% Voltage Regulation Accuracy acid (Pb-acid) battery charger controller designed to op- Programmable Constant Current (CC) Mode erate over an input-voltage range of 4.5V to 60V. The Charging Current (ILIM) MAX17702 operates over a wide -40C to +125C tem- Full-Battery Detection with Taper Current Threshold perature range and offers a complete charging solution and Absorption CV Timer (TMR) for Pb-acid batteries with a 4% accurate constant-current Wide 4.5V to 60V Input-Voltage Range regulation. The output voltage is programmable from Adjustable Output-Voltage Range from 1.25V up to 1.25V up to (V - 2.1V) with 1% regulation accuracy. (V - 2.1V) DCIN DCIN 125kHz to 2.2MHz Adjustable Frequency with The device uses an external nMOSFET to provide input External Clock Synchronization (RT/SYNC) supply-side short-circuit protection, preventing battery dis- charge. Reliable Operation in Adverse Environmental Conditions The device charges the battery in constant current (CC), Input Short-Circuit Protection (GATEN) absorption constant voltage (CV) states and enters float- Deeply Discharged Battery Detection and ing CV state after detecting taper current threshold or ab- Preconditioning (DDTH) sorption CV timer timeout in Absorption CV state. Detec- Battery Temperature Sensing and Charge when tion and preconditioning of deeply discharged batteries Within Temperature of Range (TEMP) are enabled by a deep discharge detection comparator. Output Voltage Temperature Compensation The MAX17702 is available in a 24-pin 4mm x 4mm TQFN Cycle-by-Cycle Overcurrent Limit package with an exposed pad. Programmable EN/UVLO Threshold Status Output Monitoring Using Open-Drain Applications Outputs (FLG1 and FLG2) Industrial Battery Charging and Energy Storage Overtemperature Protection Power Tools Wide -40C to +125C Ambient Operating Battery Backup for Lighting, Security Cameras, and Temperature Range/ -40C to +150C Junction Control Panels Temperature Range Portable Industrial Equipment Building and Home-Automation Backup Power Ordering Information appears at end of data sheet. Simplified Application Circuit UP TO 60V PPbb--AACCIIDD BBAATTTTEERRYY CCHHAARRGGIINNGG CCYYCCLLEE INPUT C IN V OUT V OUT DCIN GATEN VIN DH ICHG DDTH PRECHARGE CC ABSORPTION CV FLOATING CV L R S LX ISMON I I CHGMAX CHG DL V OUT PGND Pb-ACID MMAAXX1177770022 V REF CSP BATTERY CSN V OUT TEMP FB RNTC FLG1 10% TMR FLG2 t R PTC 19-101088 Rev 0 4/21MAX17702 4.5V to 60V, Synchronous Step-Down Lead-Acid Battery 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 DCIN ....................................................... -0.3V to +6V DH to LX .................................................... -0.3V to (BST + 0.3V) GATEN to SGND/EP .... max(-0.3V, DCIN - 0.3V) to (DCIN + 6V) EXTVCC to SGND/EP ............................................-0.3V to +26V V to SGND/EP .......................... -0.3V to min(+6V, V + 0.3V) PGND to SGND/EP ...............................................-0.3V to +0.3V CC IN CSN, CSP to SGND/EP .............................. -0.3V to (V + 0.6V) Continuous Power Dissipation (T = +70C) (TQFN derate IN A 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 DDTH, FB, TEMP 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 to V = 5V, V = IN DCIN VIN DCIN VCC VREF BST BST LX EN/UVLO V = V = V = V = V = V = 2.5V, V = V = 1.1V, V = V = V = 0V, RT/SYNC = DH = LX ILIM CSN CSP DDTH TMR TEMP FB EXTVCC SGND/EP PGND DL = GATEN = COMP = FLG1 = FLG2 = ISMON = Unconnected, T = -40C to +125C, unless otherwise noted. Typical values are at A T = +25C. All voltages are referenced to SGND/EP, unless otherwise noted.) (Note 2) A 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