LTC1517-5
Micropower, Regulated
5V Charge Pump in a
5-Pin SOT-23 Package
FEATURES
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DESCRIPTION
The LTC
®
1517-5 is a micropower charge pump DC/DC
converter that produces a regulated 5V output. The input
voltage range is 2.7V to 5V. Extremely low operating current
(typically 6µA with no load) and low external parts count (one
0.1µF flying capacitor and two small bypass capacitors at V
IN
and V
OUT
) make the part ideally suited for small, light load
battery-powered applications. The total printed circuit board
area of the application circuit shown below is only 0.045in
2
.
The part operates as a Burst Mode
TM
switched-capacitor
voltage doubler to produce a regulated output. The part has
thermal shutdown capability and can survive a continuous
short circuit from V
OUT
to GND. The device is available in a
5-pin SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
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Ultralow Power: I
CC
= 6
µ
A Typ
Short-Circuit/Thermal Protected
5V
±4%
Regulated Output
V
IN
Range: 2.7V to 5V
Output Current: 10mA (V
IN
≥
2.7V)
20mA (V
IN
≥
3V)
No Inductors
Ultrasmall Application Circuit (0.045in
2
)
800kHz Switching Frequency
Available in 5-Pin SOT-23
APPLICATIONS
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Cellular Telephones
Battery-Operated Equipment
Local Power Supplies
Handheld Instruments
PCMCIA Supplies
TYPICAL APPLICATION
Typical Output Voltage vs Output Current
5.2
0.1µF
5
C1
–
LTC1517-5
V
IN
V
IN
2.7V TO 5V
3.3µF
1
GND
2
V
OUT
3
6.8µF
V
OUT
= 5V
±
4%
I
OUT
= 10mA (V
IN
≥
2.7V)
I
OUT
= 20mA (V
IN
≥
3V)
1517 TA01
C1
+
OUTPUT VOLTAGE (V)
4
5.1
T
A
= 25°C
C1 = 0.1µF
C
OUT
= 6.8µF
5.0
4.9
V
IN
= 2.7V V
IN
= 3V V
IN
= 3.3V
4.8
0
U
U
U
40
60
20
OUTPUT CURRENT (mA)
80
1517 TA02
1
LINER [ LINEAR TECHNOLOGY ]
