LTC4071IDDB#TRMPBF

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The LTC4071IDDB#TRMPBF is a Bidirectional USB Power Manager and Li-Ion/Polymer Battery Charger IC in PMIC- Battery Chargers category. It monitors both input and output current and maintains USB compatibility. The device also has a Battery Good indicator output and a flag output that indicates when the output current is greater than the programmed current limit. This device is ideal for charging Lithium-ion and Lithium-polymer battery packs used in portable electronic devices such as cellular phones, PDAs, digital cameras, and MP3 players.

The LTC4071IDDB#TRMPBF is an all-in-one solution for applications including power distribution from an AC adapter, a wall adapter, a computer USB port, or a USB hub. With its bidirectional current-sensing capability, the device can also act as a mobile power-management IC (PMIC) for wall adapter-based mobile applications. The device also allows programmable, safe battery charging from any of these sources and supports Adaptive Input Current Limit to minimize battery heating during fast charging.

The device supports charging at current levels up to 2A and operates over a wide input voltage range of 3V to 30V. Its output voltage is adjustable from 4.2V nominal to reduce charge time, while the trickle-charge current allows low battery capacity devices to be adequately charged after extended storage periods. The LTC4071IDDB#TRMPBF includes battery temperature monitoring functionality to protect against overcharging and features short-circuit and thermal protection to insure safe operation.

The operation of LTC4071IDDB#TRMPBF consists of two major parts: a power path and an advanced battery charger. The power path operation of the device allows for bidirectional current flow, enabling the device to look for power and detect its direction. This allows power to flow from a USB host or will adapter, through the device and the battery, and back to the host or adapter. The reverse-power-protection feature ensures the host will not draw excessive current. The programmable input current limit allows the device to reduce the power load on the power source to avoid tripping built-in OCP. The integrated reverse charger protection FET is capable of sourcing up to 2A and ensures that the input power source will not be compromised.

The advanced battery charger operation controls the battery charging process to ensure a safe and correct charge. The linear operation of the battery charger allows for a flexible output voltage and trickle-charge current to prevent extended battery capacity loss. The on-board current-sense comparator allows forprogrammable charge current to reduce charge time at high levels and to prevent overcharging. A separate current-sense comparator monitors battery reverse current, indicating when the charge is complete. An end-of-charge indicator flag signals low battery current, indicating the end of charging.

The LTC4071IDDB#TRMPBF is a highly featured product and provides several advantages. It is one of the first products on the market to utilize USB power and charging in a single IC package, which makes it an incredibly economical solution when compared with traditional discrete solutions. The product also reduces design complexity and size, and is highly efficient over wide input voltages and currents. The integrated N-channel FET and low bias current ensure low power losses, and the bidirectional control enables power path operation, eliminating need for separate implementation. The device also features short circuit protection, thermal protection, and programmable parameters to ensure safe operation.

In conclusion, the LTC4071IDDB#TRMPBF is a bidirectional USB power manager and li-ion/polymer battery charger IC. It is designed for portable electronic device applications where power distribution from an AC adapter, a wall adapter, a computer USB port, or a USB hub are needed. The device has a wide range of features, including integrated reverse-charge protection FET, adjustable output voltage, and current-sense comparator for programmable charge current. It is highly efficient, economical, and reduces design complexity and size. It also ensures safe operation with its short circuit protection, thermal protection, and programmable parameters.

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