MAX1555 reference design circuit | battery charger application circuit

The MAX1555 charges a single-cell lithium-ion (Li+) battery via USB and AC adapter power. They require no external FETs or diodes and can accept input voltages up to 7V. This article mainly introduces the characteristics, application range, reference design circuit and circuit analysis of MAX1555 to help you shorten design time.

MAX1555 features: Charging from USB port or AC adapter; automatic power switching when AC adapter is plugged in; charging status indicator

Typical applications of MAX1555: cellular phones; digital cameras; wireless applications

MAX1555 reference design application circuit:

Figure 1 MAX1555 reference design diagram

The MAX1551/MAX1555 charge a single-cell Li+ battery from both USB and AC adapter sources, enabling portable users to forgo carrying a wall cube. These devices operate with no external FETs or diodes, and accept operating input voltages up to 7V.