4.5V to 60V, Synchronous Step-Down Lead-Acid Battery Charger Controller

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17702 is a high-efficiency, high-voltage, synchronous, step-down, Himalaya lead-acid (Pb-acid) battery charger controller designed to operate over an input-voltage range of 4.5V to 60V. The MAX17702 operates over a wide -40°C to +125°C temperature range and offers a complete charging solution for Pb-acid batteries with a ±4% accurate constant-current regulation. The output voltage is programmable from 1.25V up to (VDCIN - 2.1V) with ±1% regulation accuracy.

The device uses an external nMOSFET to provide input supply-side short-circuit protection, preventing battery discharge.

The device charges the battery in constant current (CC), absorption constant voltage (CV) states and enters floating CV state after detecting taper current threshold or absorption CV timer timeout in Absorption CV state. Detection and preconditioning of deeply discharged batteries are enabled by a deep discharge detection comparator.

he MAX17702 is available in a 24-pin 4mm x 4mm TQFN package with an exposed pad.

Applications

* Battery Backup for Lighting, Security Cameras, and Control Panels * Building and Home-Automation Backup Power * Industrial Battery Charging and Energy Storage * Portable Industrial Equipment * Power Tools

* Optimized Feature-Set for Pb-Acid Batteries

* ±4% Charging Current Regulation Accuracy

* ±6% Charging Current Monitor Accuracy (ISMON)

* ±1% Voltage Regulation Accuracy

* Programmable Constant Current (CC) Mode Charging Current (ILIM)

* Full-Battery Detection with Taper Current Threshold and Absorption CV Timer (TMR)

* Wide 4.5V to 60V Input-Voltage Range

* Adjustable Output-Voltage Range from 1.25V up to Four 12V Pb-Acid Batteries in Series

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

* Reliable Operation in Adverse Environmental Conditions

* Input Short-Circuit Protection (GATEN)

* Deeply Discharged Battery Detection and Preconditioning (DDTH)

* Battery Temperature Sensing and Charge when Within Temperature of Range (TEMP)

* Output Voltage Temperature Compensation

* Cycle-by-Cycle Overcurrent Limit

* Programmable EN/UVLO Threshold

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

* Overtemperature Protection

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

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