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LTC1517-3.3

Part Number	LTC1517-3.3
Manufacturer	Linear Technology
Description	Micropower / Regulated 3.3V Charge Pump
Published	Mar 27, 2005
Detailed Description	U U FEATURES s Ultralow Power: ICC = 6µA Typ s Short-Circuit/Thermal Protected s 3.3V ±4% Regulated Output s VIN Range:...
Datasheet	LTC1517-3.3 PDF File

Overview

U U 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 (VIN ≥ 2.
5V) s No Inductors s Ultrasmall Application Circuit (0.
045in2) 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 VIN and VOUT) make the part ideally suited for small, light load batterypowered applications.
The total printed circuit board area of the application circuit shown below is only 0.
045in2.
The part operates as a Burst ModeTM switched-capacitor voltage doubler to produce a regulated output.
The part has thermal shutdown capability and can survive a continuous short circuit from VOUT 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 54 C1– C1+ LTC1517-3.
3 VIN 2V TO 4.
4V VIN 1 3.
3µF GND VOUT 23 VOUT = 3.
3V ± 4% IOUT = 8mA (VIN ≥ 2V) 6.
8µF IOUT = 15mA (VIN ≥ 2.
5V) 1517-3.
3 TA01 OUTPUT VOLTAGE (V) Typical Output Voltage vs Output Current 3.
40 TA = 25°C C1 = 0.
1µF COUT = 6.
8µF 3.
35 3.
30 VIN = 2V VIN = 2.
5V 3.
25 3.
20 0 10 20 30 OUTPUT CURRENT (mA) 40 1517 G05 1 LTC1517-3.
3 U WU U WW W ABSOLUTE MAXIMUM RATINGS (Note 1) VIN to GND .
–...

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