Power Management Inductorless (Charge Pump) DC/DC Converters Regulated Step-Up Charge Pumps

LTC1522 - Micropower, Regulated 5V Charge Pump DC/DC Converter

Features

  • Ultralow Power: Typical Operating ICC = 6µA
  • Short-Circuit/Thermal Protected
  • Regulated 5V ±4% Output Voltage
  • 2.7V to 5V Input Range
  • No Inductors
  • Very Low ICC in Shutdown: <1µA
  • Output Current: 10mA (VIN >/=2.7V) 20mA (VIN >/=3V)
  • Shutdown Disconnects Load from VIN
  • Internal Oscillator: 700kHz
  • Compact Application Circuit (<0.1 in2)
  • 8-Pin MSOP and SO Packages

Typical Application

LTC1522 Typical Application
LTC1522 Typical Application

Description

The LTC1522 is a micropower charge pump DC/DC converter that produces a regulated 5V output from a 2.7V to 5V input supply. Extremely low supply current (6µA typical with no load, <1µA in shutdown) and low external parts count (one 0.22µF flying capacitor and two 10µF capacitors at VIN and VOUT) make the LTC1522 ideally suited for small, light load battery-powered applications. Typical efficiency (VIN = 3V) exceeds 75% with load currents between 50µA and 20mA. Modulating the SHDN pin keeps the typical efficiency above 75% with load currents all the way down to 10µA. The LTC1522 has thermal shutdown and can survive a continuous short from VOUT to GND. In shutdown the load is disconnected from VIN. The part is available in 8-pin MSOP and SO packages. The LTC1522 is pin compatible with the LTC1516 in applications where VIN >/= 2.7V and IOUT </= 20mA.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC1522CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1522CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1522CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1522CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1522IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1522IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC1522 Package Drawing
LTC1522 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC1522CMS8#PBF MS-8 C $2.50 $1.95 Yes
LTC1522CMS8#TRPBF MS-8 C $2.01 Yes
LTC1522CS8#PBF SO-8 C $2.15 $1.75 Yes
LTC1522CS8#TRPBF SO-8 C $1.81 Yes
LTC1522IS8#PBF SO-8 I $2.30 $2.00 Yes
LTC1522IS8#TRPBF SO-8 I $2.06 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • SIM Interface Supplies for GSM Cellular Telephones
  • Li-Ion Battery Backup Supplies
  • Local 3V to 5V Conversion
  • Smart Card Readers
  • PCMCIA Local 5V Supplies

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Design Tools

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LTC1522

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