LTC1517ES5-5 Datasheet, PDF (1/8 Pages) Linear Integrated Systems – Micropower, Regulated 3.3V Charge Pump in a 5-Pin SOT-23 Package

FEATURES
s _{Ultralow Power: ICC = 6µA Typ}
s _{Short-Circuit/Thermal Protected}
s _{3.3V ±4% Regulated Output}
s _{VIN Range: 2V to 4.4V}
s _{Output Current: 8mA (VIN ≥ 2V)}
15mA (V_IN ≥ 2.5V)
s _{No Inductors}
s _{Ultrasmall Application Circuit (0.045in}²₎
s _{700kHz 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}
LTC1517-3.3
Micropower, Regulated
3.3V Charge Pump in a
5-Pin SOT-23 Package
DESCRIPTION
The LTC^®1517-3.3 is a micropower charge pump DC/DC
converter that produces a regulated 3.3V output. The input
voltage range is 2V to 4.4V, allowing a single cell lithium
battery to produce a regulated 3.3V output over the entire life
of the battery. 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⁺
LTC1517-3.3
V_IN
2V TO 4.4V
V_IN
1
3.3µF
GND V_OUT
2
3
V_OUT = 3.3V ± 4%
I_OUT = 8mA (V_IN ≥ 2V)
6.8µF ^{IOUT = 15mA (VIN ≥ 2.5V)}
1517-3.3 TA01
Typical Output Voltage
vs Output Current
3.40
T_A = 25°C
C1 = 0.1µF
C_OUT = 6.8µF
3.35
3.30
V_IN = 2V
V_IN = 2.5V
3.25
3.20
0
10
20
30
OUTPUT CURRENT (mA)
40
1517 G05
1