LTC1558CS-5#PBF Integrated Circuits (ICs)

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Power management integrated circuits (PMICs) continue to evolve, offering more performance, higher efficiency, smaller form factors, and faster operations. As the name implies, the LTC1558CS-5#PBF belongs to this category of ICs and is a battery management solution from Linear Technologies. It is used in a variety of applications, especially in portable devices, where high efficiency and low standby power dissipation are required.

Applications

The LTC1558CS-5#PBF is an advanced battery management IC which is specifically designed for portable devices such as mobile phones, PDAs, and video game systems. It is designed for fast charging and discharging of Li-ion, LiPo, NiMH, and NiCd cell chemistries. It can be used in both constant-current (CC) and constant-voltage (CV) charging regimes. It is especially suited for high-power battery charging and discharging applications such as those found in electric vehicles.

The LTC1558CS-5#PBF is also ideally suited for fast-charge applications such as those found in consumer electronics and automotive products. It enables an extremely fast charging algorithm with an entry range of <5A and tapering to <125A in less than 2 seconds. It can also provide a regulated output voltage of <5V with very low output ripple (<5mV).

In addition to these features, the LTC1558CS-5#PBF includes various safety features such as over-current, over-temperature, over-voltage, and under-voltage protection. It is also compatible with the USB Battery Charging Specification (BC1.2), making it ideal for USB-based products.

Working principle

The LTC1558CS-5#PBF is a fully-integrated monitoring and protection IC for battery charging systems. It uses a charge pump circuit to provide high-efficiency power conversion and current regulation. In charging mode, the LTC1558CS-5#PBF monitors the charge voltage, charge current, and battery temperature, and adjusts the charge pump duty cycle to maintain a constant output voltage and current. In discharging mode, the charge pump is disabled, and the battery voltage is monitored to provide over-voltage and under-voltage protection.

The LTC1558CS-5#PBF also includes an on-board under-voltage lockout (UVLO) circuit and a low-battery detection circuit. The UVLO circuit disables the charge pump when the battery voltage drops below a defined level, thus protecting the battery from over-discharge. The low battery detection circuit allows the IC to shut off the charge pump when the battery is fully discharged, thereby preventing damage to the battery.

The LTC1558CS-5#PBF also provides a variety of other features including on-chip ADC, a configurable watchdog timer, a power path register, and a Real Time Clock (RTC). The ADC provides accurate readings of charge voltage, charge current, and absolute battery voltage. The watchdog timer helps monitor the charger and can be used to shut off the charge pump in case of a fault condition. The power path register enables the user to program different output voltages and current levels, while the RTC allows the user to program charge end time and alarm times.

Conclusion

The LTC1558CS-5#PBF is an advanced battery management IC from Linear Technologies. It is designed for fast charging and discharging of Li-ion, LiPo, NiMH, and NiCd cell chemistries and is specifically suited for portable devices such as mobile phones, PDAs, and video game systems. It features an on-board charge pump circuit, a UVLO circuit, a low battery detection circuit, an ADC, a watchdog timer, a power path register, and a RTC. All of these features make the LTC1558CS-5#PBF an ideal solution for high-performance and efficiency battery management in portable applications.

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