LTC4085EDE-1#PBF

Series:	PowerPath™
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	--
Charge Current - Max:	1.5A
Battery Pack Voltage:	4.1V
Voltage - Supply (Max):	5.5V
Interface:	USB
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	14-WFDFN Exposed Pad
Supplier Device Package:	14-DFN (4x3)
Base Part Number:	LTC4085

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Introduction:

The LTC4085EDE-1#PBF is a highly integrated power management integrated circuit (PMIC) designed for use in battery chargers. It integrates the power path, charge control, system monitoring, and fault protection necessary for fast, safe, and accurate charging of multiple-cell lithium-ion (Li-Ion) or lithium polymer (Li-Poly) batteries. The device includes an integrated high-Voltage power MOSFET, charge current regulation and monitoring, cell temperature monitoring, system power monitoring, and protection circuitry.

Features:

The LTC4085EDE-1#PBF integrates a complete power solution for Li-Ion/Li-Poly battery charging. The highly integrated feature set includes:* An adjustable open-drain current sense amplifier with programmable current limit* An adjustable, programmable, 3A battery charge current MOSFET* Programmable charge timer* Temperature feedback for safety and accurate charging* A low-Voltage Power-on Reset (POR) to ensure safe system power-up* A low battery/high battery detect* Programmable, selectable, voltage-based battery charge termination

Application Fields:

The LTC4085EDE-1#PBF is ideally suited for battery powered applications such as mobile phones, PDAs, portable electronics, handheld communication devices, and other handheld devices. It is also suitable for powering other devices, such as digital cameras and portable medical devices, or anywhere a compact, efficient, and accurate power management is needed.

Working Principle:

When a system powered by the LTC4085EDE-1#PBF is powered up, a power-on reset (POR) circuit sets the charge current to its minimum level and the charge timer to an initial value. The current sense amplifier monitors the charge current and adjusts it automatically according to the voltage applied to the CS pin. The device then continuously monitors the battery voltage, temperature, and system current to provide accurate charging of the battery. When the voltage of the battery reaches its full charge voltage, the charge timer ends and the LTC4085EDE-1#PBF shuts down the charge MOSFET and changes its state to charge complete. If the voltage or temperature becomes too high, the device will shut down the charging current, trip an active fault flag, and enter a safe state.

Conclusion:

The LTC4085EDE-1#PBF is an ideal PMIC for battery charge management in portable devices. With its integrated feature set and flexible programming, the LTC4085EDE-1#PBF is the ideal solution for fast, safe, and accurate charging of Li-Ion and Li-Poly batteries. The integrated power management and safety features make it especially suitable for demanding battery-powered applications.

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