LTC3221-5 Linear Technology, LTC3221-5 Datasheet
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LTC3221-5
Manufacturer Part Number
LTC3221-5
Description
Micropower
Manufacturer
Linear Technology
Datasheet
1.LTC3221-5.pdf
(12 pages)
www.DataSheet4U.com
FEATURES
APPLICATIO S
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TYPICAL APPLICATIO
Ultralow Power: 8µA Quiescent Current
Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
V
Output Current: Up to 60mA
No Inductors Needed
Very Low Shutdown Current: <1µA
Shutdown Disconnects Load from V
Burst Mode Control
Short-Circuit Protected
Solution Profi le < 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
IN
1.8V to 4.4V (LTC3221-3.3)
2.7V to 5.5V (LTC3221-5)
Range:
REGULATED 3.3V OUTPUT FROM 1.8V TO 4.4V INPUT
REGULATED 5V OUTPUT FROM 2.7V TO 5.5V INPUT
2.2µF
OFF ON
V
IN
U
4,7
5
3
V
I
I
V
I
I
OUT
OUT
OUT
OUT
V
GND
SHDN
OUT
OUT
C
IN
LTC3221-X
–
2
= OmA TO 25mA; V
= OmA TO 60mA; V
= OmA TO 25mA; V
= OmA TO 60mA; V
1µF
= 3.3V ±4%
= 5V ±4%
V
OUT
C
+
1
6
3221 TA01
U
4.7µF
IN
IN
IN
IN
V
OUT
IN
>1.8V
>2V
>2.7V
>3V
DESCRIPTIO
The LTC
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 fl ying capacitor and two small bypass
capacitors at V
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
to achieve ultralow quiescent current. The chips use a
controlled current to supply the output and will survive
a continuous short-circuit from V
of the adjustable LTC3221 can be used to program the
desired output voltage.
The LTC3221 family is available in a low profi le (0.75mm)
2mm × 2mm 6-pin DFN package.
Mode is a registered trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
Regulated Charge Pump
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst
®
3221 family are micropower charge pump DC/DC
LTC3221-3.3/LTC3221-5
16
14
12
10
8
6
4
2
0
1.5
T
T
T
A
A
IN
A
= 25°C
= –45°C
®
= 90°C
2.0
and V
No-Load Input Current
switched capacitor voltage doublers
vs Supply Voltage
U
SUPPLY VOLTAGE (V)
2.5
OUT
3.0
) make them ideally suited for
Micropower,
3.5
in 2 × 2 DFN
OUT
4.0
to GND. The FB pin
3221 TA01b
LTC3221/
4.5
1
3221f