LTC3221-3.3 Datasheet | Linear Technology

LTC3221/ LTC3221-3.3/LTC3221-5 Micropower, Regulated Charge Pump in 2 × 2 DFN Features Ultralow Power: 8µA Quiescent Current - Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ - V IN Range: 1.8V to 4.4V (LTC3221-3.3) .. 2.7V to 5.5V (LTC3221-5) - Output Current: Up to 60m A - No Inductors Needed - Very Low Shutdown Current: <1µA - Shutdown Disconnects Load from V IN - Burst Mode Control - Short-Circuit Protected - Solution Profile < 1mm - Tiny 2mm × 2mm 6-Pin DFN Package - DESCRIPTIO The LTC®3221 family are micropower charge pump DC/DC converters that produce a regulated output at up to 60m A. The input voltage range is 1.8V to 5.5V. Extremely low operating current (8µA typical at no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications. The LTC3221 family includes fixed 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 LTC3221 family is available in a low profile (0.75mm) 2mm × 2mm 6-pin DFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. U APPLICATIO S - - - - - - Low Power 2 AA Cell to 3.3V Supply Memory Backup Supplies Tire Pressure Sensors General Purpose Low Power Li-Ion to 5V Supply RF Transmitters Glucose Meters TYPICAL APPLICATIO 1µF 2 VIN 2.2µF 5 4,7 3 C- VIN GND SHDN 1 No-Load Input Current vs Supply Voltage 16 NO-LOAD INPUT CURRENT (µA) C+ 6 VOUT 14 12 10 8 6 4 2 0 1.5 2.0 2.5 3.0 3.5 SUPPLY VOLTAGE (V) 4.0 4.5 TA = 90°C TA = 25°C...