LTC1517-5 Datasheet, PDF (1/8 Pages) Linear Technology – Micropower, Regulated 5V Charge Pump in a 5-Pin SOT-23 Package

FEATURES
s _{Ultralow Power: ICC = 6µA Typ}
s _{Short-Circuit/Thermal Protected}
s _{5V ±4% Regulated Output}
s _{VIN Range: 2.7V to 5V}
s _{Output Current: 10mA (VIN ≥ 2.7V)}
20mA (V_IN ≥ 3V)
s _{No Inductors}
s _{Ultrasmall Application Circuit (0.045in}²₎
s _{800kHz Switching Frequency}
s _{Available in 5-Pin SOT-23}
U
APPLICATIONS
s _{Cellular Telephones}
s _{Battery-Operated Equipment}
s _{Local Power Supplies}
s _{Handheld Instruments}
s _{PCMCIA Supplies}
LTC1517-5
Micropower, Regulated
5V Charge Pump in a
5-Pin SOT-23 Package
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 0.045in².
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.
TYPICAL APPLICATION
0.1µF
5
4
C1^–
C1⁺
LTC1517-5
V_IN
2.7V TO 5V
V_IN
1
3.3µF
GND V_OUT
2
3
V_OUT = 5V ± 4%
I_OUT = 10mA (V_IN ≥ 2.7V)
6.8µF ^{IOUT = 20mA (VIN ≥ 3V)}
1517 TA01
Typical Output Voltage vs Output Current
5.2
T_A = 25°C
C1 = 0.1µF
C_OUT = 6.8µF
5.1
5.0
4.9
4.8
0
V_IN = 2.7V V_IN = 3V V_IN = 3.3V
20
40
60
OUTPUT CURRENT (mA)
80
1517 TA02
1