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LTC3221 Datasheet, PDF (1/12 Pages) Linear Technology – Micropower, Regulated Charge Pump in 2 × 2 DFN | |||
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LTC3221/
LTC3221-3.3/LTC3221-5
Micropower,
Regulated Charge Pump
in 2 Ã 2 DFN
FEATURES
â Ultralow Power: 8µA Quiescent Current
â Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
â VIN Range:
1.8V to 4.4V (LTC3221-3.3)
2.7V to 5.5V (LTC3221-5)
â Output Current: Up to 60mA
â No Inductors Needed
â Very Low Shutdown Current: <1µA
â Shutdown Disconnects Load from VIN
â Burst Mode Control
â Short-Circuit Protected
â Solution Proï¬le < 1mm
â Tiny 2mm à 2mm 6-Pin DFN Package
U
APPLICATIO S
â Low Power 2 AA Cell to 3.3V Supply
â Memory Backup Supplies
â Tire Pressure Sensors
â General Purpose Low Power Li-Ion to 5V Supply
â RF Transmitters
â Glucose Meters
DESCRIPTIO
The LTC®3221 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 ï¬ying capacitor and two small bypass
capacitors at VIN and VOUT) make them ideally suited for
small, battery-powered applications.
The LTC3221 family includes ï¬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 proï¬le (0.75mm)
2mm à 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.
TYPICAL APPLICATIO
1µF
VIN
2.2µF
2
5
Câ
VIN
1
C+
VOUT
6
LTC3221-X
4,7 GND
VOUT
4.7µF
OFF ON 3 SHDN
3221 TA01
REGULATED 3.3V OUTPUT FROM 1.8V TO 4.4V INPUT
VOUT = 3.3V ±4%
IOUT = OmA TO 25mA; VIN >1.8V
IOUT = OmA TO 60mA; VIN >2V
REGULATED 5V OUTPUT FROM 2.7V TO 5.5V INPUT
VOUT = 5V ±4%
IOUT = OmA TO 25mA; VIN >2.7V
IOUT = OmA TO 60mA; VIN >3V
No-Load Input Current
vs Supply Voltage
16
14
12
10 TA = 90°C
TA = 25°C
8
6 TA = â45°C
4
2
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
3221 TA01b
3221f
1
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