Linear Technology announces the LTC3221/-3.3/-5 regulated step up charge pumps offered in a 2mm x 2mm DFN package. Featuring 60mA output current and Burst Mode operation, the LTC3221 family consumes an quiescent current of 8uA. The device has an adjustable output voltage and a input voltage range of 1.8V to 5.5V with a maximum output level not greater than twice the available input voltage. The LTC3221-3.3 generates a regulated boosted output voltage of 3.3V from a minimum input voltage of 1.8V, while the LTC3221-5 produces a 5V output from a minimum 2.7V input voltage.

The family's combination of low quiescent current and regulated output make them ideal for low power memory backup supplies, automotive sensors, RF transmitters and handheld devices, in addition to general purpose 2 AA cell to 3.3V supply or Li-Ion/Polymer to 5V supply conversion. The LTC3221/-3.3/-5's high 600kHz switching frequency enables the use of external ceramic capacitors. Low external parts count (one flying capacitor and two bypass capacitors at VIN and VOUT) and the low-profile DFN package achieves an extremely compact solution for space-constrained applications.

Other features of the LTC3221/-3.3/-5 include load disconnect from the input during shutdown and short-circuit protection. The LTC3221EDC, LTC3221EDC-3.3 and LTC3203EDC-5 are available in the low-profile 6-lead DFN (2mm x 2mm x 0.75mm) package. Pricing starts at $1.60 each in 1,000-piece quantities.

Summary of Features of LTC3221/-3.3/-5

• 8uA Quiescent Current
• Regulated Ouptut Voltages: 3.3V ± 4%, 5V ± 4%
• ADJ Burst Mode Operation
• VIN Ranges: 1.8V to 5.5V for LTC3221, 1.8V to 4.4V for LTC3221-3.3, 2.7V to 5.5V for LTC3221-5
• Output Current: up to 60mA
• No Inductor
• Shutdown Current <1uA
• Shutdown Disconnects Load from VIN
• Short Circuit Protected
• Low Profile 6-Pin DFN (2mm x 2mm x 0.75mm) Package