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LTC3221 データシートの表示(PDF) - Linear Technology

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LTC3221
Linear
Linear Technology Linear
LTC3221 Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
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
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 Profile < 1mm
Tiny 2mm × 2mm 6-Pin DFN Package
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
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 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.
TYPICAL APPLICATIO
1µF
VIN
2.2µF
2
5
C
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 = –45°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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