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MAX1874 - 1-Cell Li+ Charger

General Description

The MAX1874 charges a single-cell Li+ battery from both USB and AC adapter sources.

It also includes battery-to-input power switchover, so the system can be powered directly from the power source rather than from the battery.

Key Features

  • include a CHG output to indicate when battery current tapers below a predetermined level. DC power-OK (DCOK), USB power-OK (UOK), and poweron (PON) outputs indicate when valid power is present. These outputs drive logic or power-selection MOSFETs to disconnect the charging sources from the load and to protect the MAX1874 from overvoltage. The MAX1874 contains no logic for communication with the USB host. It must receive instructions from a local microcontroller. The MAX1874 is available in a 16-.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MAX1874 19-2912; Rev 1; 2/07 EVAALVUAAILTAIOBNLEKIT Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation General Description The MAX1874 charges a single-cell Li+ battery from both USB and AC adapter sources. It also includes battery-to-input power switchover, so the system can be powered directly from the power source rather than from the battery. In its simplest application, the MAX1874 needs no external MOSFET or diodes, and accepts input voltages up to 6.5V; however, DC input overvoltage protection up to 18V can be added with a single SOT PFET. On-chip thermal limiting simplifies printed circuit board (PCB) layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage.