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Linear Technology has launched the LTC4160 and LTC4160-1 power manager ICs for single-cell lithium-ion-/polymer-battery-based applications.

These include media players, personal navigation devices, digital cameras, personal digital assistants and smart phones.

The LTC4160 and the LTC4160-1 each feature a bidirectional switching power manager that can power an application and charge the battery from USB.

Operating in reverse, the same switching regulator can take power from the battery to generate 5V and deliver up to 500mA for USB On-The-Go (OTG) applications without any additional components.

The LTC4160 and the LTC4160-1 include automatic load prioritisation when powered from USB, input overvoltage protection, a standalone battery charger and an ideal diode, all in a compact, ultra-low-profile (0.55mm) 3 x 4mm UTQFN package.

The LTC4160-1 offers a 4.1V battery float voltage, allowing a high-temperature safety margin, while the LTC4160 features a 4.2V final charge voltage for optimised battery runtime.

The on-chip switching regulator also features programmable input current limits of 100mA and 500mA for enhanced USB compatibility, as well as a wall adapter input current limit setting up to 1.2A.

For fast charging, the LTC4160 and the LTC4160-1 convert nearly all of the 2.5W available from the USB port to charging current, enabling up to 600mA of charge current from a 500mA limited USB supply and up to 1.2A of charge current from a wall adapter.

The devices provide an overvoltage protection (OVP) control circuit that prevents damage to their input from the accidental application of high transient voltages.

The OVP circuit can protect the USB port even when the IC is providing power for USB OTG.

The devices’ Powerpath control with automatic load prioritisation manages power flow between a variety of input power sources such as a wall adapter or USB port and the lithium-ion/polymer battery while preferentially providing power to the system load.

The IC’s ‘Instant-ON’ operation ensures system load power even with a fully discharged battery.

The switching regulator of the LTC4160 and the LTC4160-1 features Bat-Track adaptive output control, which improves the efficiency of its battery charger by maintaining the output voltage approximately 300mV above the battery voltage.

An internal 180mohm ideal diode plus optional external ideal diode controller provide a low-loss power path from the battery to the load when input power is limited or unavailable.

The devices’ standalone battery charger features autonomous operation that simplifies design and eliminates the need for an external microprocessor for charge termination.

To preserve battery energy, the LTC4160 and the LTC4160-1 draw less than 4uA from the battery in suspend mode and less than 8uA in ideal diode mode.

The LTC4160 and the LTC4060-1 are available from stock in a compact, ultra-thin (0.55mm) 3 x 4mm 20-pin QFN package.

Pricing starts at USD2.85 (GBP1.78) each for 1,000-piece quantities.

Linear Technology now part of Analog Devices

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