LTC3221 - Micropower, Regulated Charge Pump in 2 x 2 DFN

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 (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 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 LTC3221 family is available in a low profile (0.75mm) 2mm × 2mm 6-pin DFN package.

Features

Ultralow Power: 8μA Quiescent Current
Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
VIN Range: 1.8V to 4.4V (LTC3221-3.3) 2.7V to 5.5V (LTC3221-5)
Output Current: Up to 60mA
No Inductors Needed
Very Low Shutdown Current: <1μA
Shutdown Disconnects Load from VIN
Burst Mode Control
Short-Circuit Protected
Solution Profi le < 1mm
Tiny 2mm × 2mm 6-Pin DFN Package

Typical Application

Applications

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

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3221EDC-3.3#PBF	2x2 DFN-6	E	$2.29
LTC3221EDC-3.3#TRMPBF	2x2 DFN-6	E	$2.34	$1.65
LTC3221EDC-3.3#TRPBF	2x2 DFN-6	E	$2.29	$1.60
LTC3221EDC-5#PBF	2x2 DFN-6	E	$2.29
LTC3221EDC-5#TRMPBF	2x2 DFN-6	E	$2.34	$1.65
LTC3221EDC-5#TRPBF	2x2 DFN-6	E	$2.29	$1.60
LTC3221EDC#PBF	2x2 DFN-6	E	$2.29
LTC3221EDC#TRMPBF	2x2 DFN-6	E	$2.34	$1.65
LTC3221EDC#TRPBF	2x2 DFN-6	E	$2.29	$1.60

Demo Boards

Part Number	Description	Price
DC862A-A	LTC3221EDC-3.3 Demo Board \| Micropower Regulated Charge Pump, 1.8V ≤ VIN ≤ 4.4V, Vout = 3.3V @ Up to 60mA	$75.00
DC862A-B	LTC3221EDC-5 Demo Board \| Micropower Regulated Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout = 5V @ Up to 60mA	$75.00
DC862A-C	LTC3221EDC Demo Board \| Micropower Regulated Adj Output Charge Pump, 1.8V ≤ VIN ≤ 3.8V, Vout = 3V @ Up to 60mA	$75.00