4.5V to 60V, Synchronous Step-Down Supercapacitor Charger Controller

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17701 is a high efficiency, high voltage, Himalaya synchronous, step-down, supercapacitor charger controller designed to operate over an input-voltage range of a 4.5V to 60V. The MAX17701 operates over a -40°C to +125°C industrial temperature range and charges a supercapacitor with a ±4% accurate constant current. After the supercapacitor is charged, the device regulates the no-load output voltage with ±1% accuracy. The output voltage is programmable from 1.25V up to (VDCIN - 2.1V).

The MAX17701 supercapacitor charger controller is designed to provide a holistic application solution requiring backup energy storage with a precise charging capability. The device uses an external nMOSFET to provide input supply-side short-circuit protection; thus, preventing supercapacitor discharge.

The MAX17701 provides a safety timer (TMR) feature to set the maximum allowed constant current (CC) mode charging time. The device features an uncommitted comparator, which can be used to detect an output overvoltage event (OVI) and prevent the supercapacitor from overcharging. The MAX17701 is available in a 24-pin 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

* Optimized Feature Set for Supercapacitor Charging

* ±4% Charging Current Regulation Accuracy

* ±6% Charging Current Monitor Accuracy (ISMON)

* ±1% Voltage Regulation Accuracy

* Programmable CC Mode Charging Current (ILIM)

* Wide 4.5V to 60V Input-Voltage Range

* Adjustable Output-Voltage Range from 1.25V Up To (VDCIN - 2.1V)

* 125kHz to 2.2MHz Adjustable Frequency with External Clock Synchronization (RT/SYNC)

* Reliable Operation in Adverse Environmental Conditions

* Input Short-Circuit Protection (GATEN)

* Safety Timer Feature (TMR)

* Output Overvoltage Protection (OVI)

* Cycle-by-Cycle Overcurrent Limit

* Programmable EN/UVLO Threshold

* Status Output Monitoring Using Open-Drain Outputs (FLG1 and FLG2)

* Complies with CISPR 32 (EN55032) Class B Conducted and Radiated Emissions

* Overtemperature Protection

* Wide -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range