LTC3111HDE#PBF

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LTC3111HDE#PBF belongs to PMIC – Voltage Regulators – DC DC Switching Regulators category. It is a single cell Li-Ion/polymer battery charger with a switchable white LED driver and a programmable DC-DC converter ideal for power save applications. It is a low-cost, high-efficiency, high-temperature, low-voltage and low-power device. It can operate both in step up (boost) and step down (buck) mode, providing regulated output current suitable for a variety of applications.

LTC3111HDE#PBF provides a regulated output voltage from 0.8V to 5V. In order to achieve maximum efficiency and performance, LTC3111HDE#PBF features a current mode control with internal soft start and pulse frequency modulation (PFM). It provides programmable power good output, frequency operation and adjustable shutdown voltage. As an additional feature, LTC3111HDE#PBF supports an optimized switching frequency of up to 2MHz to reduce its device size.

LTC3111HDE#PBF has a wide range of application fields. It can be used as a simple battery charger, DC-DC converter and white LED driver. It is mainly used in battery powered applications such as mobile phones, PDAs, GPS, medical instruments, and portable audio players. Owing to its low input current and high efficiency power saving design, it is suitable for applications that require high efficiency over a wide range of input and load conditions, such as solar powered applications.

LTC3111HDE#PBF also includes internal function that improve EMI performance. Its frequency of operation is programmable from 200kHz to 2MHz, allowing operation at lower frequency for smaller size inductor and optional use of ceramic output capacitor. Besides, its fixed-frequency current mode design reduces input transients and a 0.5V hysteresis in the regulation loop reduces input effects and improves loop stability. All these improve EMI performance, while offering the necessary performance needed in most battery-powered applications.

LTC3111HDE#PBF switching power converters are based on the principle of Pulse Width Modulation (PWM). In this type of circuits, a switching element is placed between an input power source and an output load, and the output of the power supply is regulated using PWM technique. The switching element is usually a field effect transistor (FET) that is switched on and off at a certain frequency. The duty cycle and frequency of the FET switching determine the amount of current delivered and the output voltage of the switching power converter. This technique is used in order to achieve the highest efficiency and performance from the converter.

As modern power-supplies become more efficient and smaller, the demand for DC-DC switching regulators such as LTC3111HDE#PBF will increase in both portable and power saving applications. In addition, its ability to regulate and control both current output and voltage will make it a preferred choice for a wide range of applications. For example, its current mode control, internal soft start and digital programmability make it suitable for applications that need high efficiency and performance over a wide range of input and output conditions. In conclusion, LTC3111HDE#PBF is an ideal solution for numerous battery powered portable applications, solar powered applications and any other application where high efficiency and performance is needed.

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