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Description

The MAX17435 / MAX17535 integrated multichemistry battery-charger ICs simplify construction of accurate and efficient chargers. The MAX17435/MAX17535 provide SMBusK-programmable charge current, charge voltage, input current limit, relearn voltage, and digital readback of the IINP voltage. The MAX17435/MAX17535 utilize a charge pump to control the adapter selection n-channel MOSFETs when the adapter is present. When the adapter is absent, the charge pump is shut down and a p-channel MOSFET selects the battery.

The MAX17435/MAX17535 provide up to 7A of charge current to 2, 3, or 4 lithium-ion (Li+) cells in series. The charge current, and input current-limit sense amplifiers have low offset errors and can use 10mIsense resistors. The MAX17435/MAX17535 fixed-inductor ripple architecture significantly reduces component size and circuit cost.

Features

1. Low-Cost SMBus Charger
2. High Switching Frequency (0.85MHz/0.5MHz)
3. Internal Boost Switches
4. SMBus-Programmable Charge Voltage, Input Current Limit, Charge Current, Relearn Voltage,and Digital IINP Readback
5.  Single-Point Compensation
6.  Automatic Selection of System Power Source Adapter n-Channel MOSFETs Driven by an
Internal Dedicated Charge Pump Adapter Soft-Start
7. Monitor Outputs for AC Adapter Current (±2% Accuracy)
8.  AC Adapter Overvoltage Protection
9.  11-Bit Battery Voltage Setting
10.  6-Bit, Charge-Current Setting/Input Current Setting
11.  Improved IINP Accuracy at Low Input Current