Analog Devices, Inc.

MAX1538ETI+T

Power Management (PMIC)
Battery Management
Semiconductors
Maxim Integrated
Product description: Battery Management Power-Source Selector for Dual-Battery S
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The MAX1538 selector provides power-source control for dual-battery systems. The device selects between an AC adapter and dual batteries based on the pres ence of the three power sources and the state of charge of each battery. The MAX1538 includes analog comparators to detect AC/airline-adapter presence and determine battery undervoltage. Fast analog circuitry allows the device to switch between power sources to implement a break-before-make time, which allows hot swapping of battery packs. The MAX1538 indepen dently performs power-source monitoring and selec tion, freeing the system power-management µP for other tasks. This simplifies the development of µP power-management firmware and allows the µP to enter standby, reducing system power consumption.

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