LTC3221/

LTC3221-3.3/LTC3221-5

1

3221f

LTC3221-X

3221 TA01

4.7

µF

1

µF

OFF ON

GND

SHDN

2.2

µF

6

1

2

5

4,7

3

REGULATED 3.3V OUTPUT FROM 1.8V TO 4.4V INPUT

REGULATED 5V OUTPUT FROM 2.7V TO 5.5V INPUT

SUPPLY VOLTAGE (V)

1.5

3.0

4.0

3221 TA01b

2.0

2.5

3.5

16

14

12

10

8

6

4

2

0

4.5

Micropower,

Regulated Charge Pump

in 2 × 2 DFN

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

small, battery-powered applications.

The LTC3221 family includes fixed 5V and 3.3V output

versions plus an adjustable version. All parts operate

to achieve ultralow quiescent current. The chips use a

controlled current to supply the output and will survive

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.

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

APPLICATIO S

■

Ultralow Power: 8µA Quiescent Current

■

Regulated Output Voltages: 3.3V ± 4%, 5V ± 4%, ADJ

■

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

■

■

Burst Mode Control

■

Short-Circuit Protected

■

Solution Profile < 1mm

■

Tiny 2mm × 2mm 6-Pin DFN Package

■

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

No-Load Input Current

vs Supply Voltage