MAX1538ETI+

Overview

The MAX1538ETI+ is a power-source selector for dual-battery systems, managing power between an AC adapter and two batteries. It features a 4.75V to 28V AC adapter input range and supports battery capacity rebuild mode. The device includes analog comparators for detecting AC/airline adapter connections and battery under-voltage conditions. It utilizes a make-before-break switching sequence for hot-swappable battery packs. The component operates within a -40°C to +85°C temperature range and is housed in a 28-pin TQFN (5mm x 5mm) package.

Feature Summary

• Provides automatic power-source selection between AC adapters and dual batteries based on connection status and battery health.
• Supports battery capacity rebuild mode, allowing selected batteries to discharge even when the AC adapter is connected.
• Features airline mode that disables charging and discharging upon detection of an aircraft adapter, drawing power solely from the adapter.
• Integrates analog comparators to detect AC/airline adapter presence and battery under-voltage states without external components.

Applications

• Dual-battery portable devices
• Laptops and sub-laptops
• Network appliances

Procurement Notes

Verify the specific suffix ETI+ against the manufacturer's current datasheet to confirm pinout and thermal pad configuration. Confirm RoHS compliance status as manufacturing processes evolve. Check for obsolescence notices or lifecycle changes directly with Analog Devices. Ensure the 28-TQFN footprint matches the target PCB design constraints.

Selection Notes

Select this component for systems requiring independent monitoring and selection of multiple power sources. It simplifies microprocessor firmware by handling power management logic autonomously. Suitable for applications needing hot-swappable battery support and reduced system standby power consumption through integrated comparator functions.

Part Context

The MAX1538 belongs to Maxim Integrated's battery management portfolio, designed to offload power control tasks from the main system processor. It complements other Maxim ICs like the MAX1704x fuel gauges and LTC2943 power monitors in comprehensive power management solutions for mobile computing platforms.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Verify compatibility with existing firmware and hardware designs if considering alternative power source selectors from the same manufacturer family.