Micropower Regulated Charge Pump in 2 x 2 DFN

Description: The LTC3221 family consists of micropower charge pump DC/DC converters that deliver a regulated output of up to 60mA. The input voltage range is from 1.8V to 5.5V. With an extremely low operating current of 8µA typical at no load and a minimal external component requirement (one flying capacitor and two small bypass capacitors at VIN and VOUT), these converters are ideal for small, battery-powered applications. The LTC3221 family includes fixed output versions of 5V and 3.3V, as well as an adjustable version. All components function as Burst Mode switched capacitor voltage doublers, achieving ultra-low quiescent current. The chips utilize a controlled current to supply the output and can withstand continuous short-circuit conditions from VOUT to GND. The feedback (FB) pin of the adjustable LTC3221 can be employed to set the desired output voltage. Pricing information is provided for budgetary use only and may vary internationally due to local duties, taxes, and exchange rates. For specific volume pricing or delivery quotes, customers are advised to contact their local Linear Technology sales office or authorized distributor. Linear Technology offers various demo boards at no charge to qualified customers, and some demo boards may also be available for purchase through this website. It is the customer's responsibility to ensure proper and reliable operation in their specific applications.

The LTC3221 series of micropower charge pump DC/DC converters is designed to meet the needs of low-power applications while providing flexibility in output voltage selection. The devices are particularly well-suited for portable and battery-operated devices due to their low quiescent current and minimal external component requirements. The operation within a wide input voltage range of 1.8V to 5.5V allows for compatibility with various battery chemistries and voltage levels, making it versatile for different applications.

The architecture of the LTC3221 family employs a switched capacitor technique, which effectively doubles the input voltage while maintaining high efficiency. The use of Burst Mode operation significantly reduces power consumption during periods of low load, ensuring that the device remains efficient even under varying load conditions. This is particularly beneficial in battery-powered applications where energy conservation is critical.

The adjustable version of the LTC3221 allows for customization of the output voltage through the feedback pin, providing design flexibility for engineers. The ability to withstand continuous short circuits at the output enhances the reliability of the device in real-world applications, protecting against potential damage in the event of a fault condition.

In summary, the LTC3221 family of micropower charge pump converters offers a robust solution for designers seeking efficient, low-power voltage regulation in compact form factors. With its low operating current, minimal component count, and flexible output options, it is an ideal choice for modern battery-powered electronics.The LTC3221 family are micropower charge pump DC/DC converters that produce a regulated output at up to 60mA. The input voltage range is 1. 8V to 5. 5V. Extremely low operating current (8 A typical at no load) and low external parts count (one fl ying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, bat

tery-powered applications. The LTC3221 family includes fi xed 5V and 3. 3V output versions plus an adjustable version. All parts operate as Burst Mode switched capacitor voltage doublers to achieve ultralow quiescent current. The chips use a controlled current to supply the output and will survive a continuous short-circuit from VOUT to GND.

The FB pin of the adjustable LTC3221 can be used to program the desired output voltage. * The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer`s responsibility to verify proper and reliable operation in the actual end application.