LTC4006EGN-2#PBF

LTC4006EGN-2#PBF Application Field and Working Principle

Introduction

The LTC4006EGN-2#PBF is a low input voltage Li-Ion/Polymer battery charger capable of operating from a 2.7V to 6V input, and is designed to charge 4-cell and single-cell Li-Ion/Polymer batteries. The LTC4006EGN-2#PBF has very low quiescent current and high efficiency to minimize power dissipation and achieve long battery life when charging from low input sources. This device will automate the charging process, performing constant-current/constant-voltage charging, as well as a float for periodic topping off of the batteries. This device also includes a low battery detection circuit that can be used for analog cell balancing for 4-cell battery packs.

Application Field

The LTC4006EGN-2#PBF is used in a variety of products, such as cell phones, digital cameras, PDAs, MP3 players, and other portable electronics that require Lithium-Ion/Polymer battery charging. The LTC4006EGN-2#PBF is capable of (>90%) 1A of constant-current/constant-voltage, float charge, as well as low battery detection, making it versatile for use in a number of different products. Additionally, the LTC4006EGN-2#PBF can be used to automate the cell balancing process for 4-cell or 8-cell battery packs.

Working Principle

The LTC4006EGN-2#PBF is a power management IC (PMIC) that is used to charge Lithium-Ion/Polymer batteries from a 2.7 to 6V input. The LTC4006EGN-2#PBF takes a very low quiescent current (400µA) from the input source and is capable of delivering up to 1A of charge current to the battery. This device includes an Overvoltage Protection (OVP) circuit to protect the battery from inadvertent overcharging, as well as an internal thermal regulation loop to simplify system design and reduce the total power dissipation of the system. The LTC4006EGN-2#PBF also has a low battery detection circuit that can be used for analog cell balancing for 4-cell battery packs.

The LTC4006EGN-2#PBF operates in two different modes: constant-current and constant-voltage. The constant-current mode is used to increase the battery voltage to its predetermined float voltage. The constant-voltage mode is used to maintain the voltage at the pre-defined float voltage. Additionally, the LTC4006EGN-2#PBF is able to perform low battery detection for 4-cell packs, as well as provide analog cell balancing.

Conclusion

The LTC4006EGN-2#PBF is an excellent solution for charging Lithium-Ion/Polymer batteries in portable electronics. It is capable of supplying up to 1A of charging current while taking only 400µA quiescent current. It provides overvoltage protection, thermal regulation and low battery detection. Its analog cell balancing capability makes it well-suited for use in 4-cell battery packs.