LTC1515 - Step-Up/Step-Down Switched Capacitor DC/DC Converters with RESET

Features

  • Adjustable/Selectable 3V, 3.3V or 5V Output Voltages
  • 2V to 10V Input Voltage Range
  • Up to 50mA Output Current
  • Only Three External Capacitors Required
  • Soft Start Limits Inrush Current at Turn-On
  • Low Operating Current: 60µA
  • Very Low Shutdown Current: < 1µA
  • Shutdown Disconnects Load from VIN
  • VOUT Programmable to 3V/5V or 3.3V/5V
  • Short-Circuit and Overtemperature Protected
  • 650kHz Switching Frequency
  • Open-Drain Power-On Reset Output
  • Available in SO-8 Package

Typical Application

LTC1515 Typical Application
LTC1515 Typical Application

Description

The LTC1515, LTC1515-3/5 and LTC1515-3.3/5 are micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is adjustable using an external resistor divider (LTC1515) or programmable to either 3V/5V (LTC1515-3/5) or 3.3V/5V (LTC1515-3.3/5) using a logic pin.A unique architecture allows the parts to accommodate a wide input voltage range (2V to 10V) while maintaining ±4% regulation. Additional circuitry prevents excessive inrush current and output voltage ripple when large VIN to VOUT differentials are present.An internal power-on reset circuit forces the POR pin low on initial power-up. The POR output remains low until 200ms (typ) after VOUT is in regulation.The parts are short-circuit and over-temperature protected. Battery life is maximized by very low operating currents (ICC = 60µA typ, ICC<1µA in shutdown). All three parts are available in an SO-8 package.

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
LTC1515CS8-3.3/5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1515CS8-3.3/5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1515CS8-3/5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1515CS8-3/5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1515CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1515CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1515IS8-3.3/5#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1515IS8-3.3/5#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1515IS8-3/5#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1515IS8-3/5#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1515IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1515IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC1515 Package Drawing
LTC1515 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
LTC1515CS8-3.3/5#PBF SO-8 C $4.35 $3.50 Yes
LTC1515CS8-3.3/5#TRPBF SO-8 C $3.56 Yes
LTC1515CS8-3/5#PBF SO-8 C $4.35 $3.50 Yes
LTC1515CS8-3/5#TRPBF SO-8 C $3.56 Yes
LTC1515CS8#PBF SO-8 C $4.35 $3.50 Yes
LTC1515CS8#TRPBF SO-8 C $3.56 Yes
LTC1515IS8-3.3/5#PBF SO-8 I $5.25 $4.20 Yes
LTC1515IS8-3.3/5#TRPBF SO-8 I $4.26 Yes
LTC1515IS8-3/5#PBF SO-8 I $5.25 $4.20 Yes
LTC1515IS8-3/5#TRPBF SO-8 I $4.26 Yes
LTC1515IS8#PBF SO-8 I $5.25 $4.20 Yes
LTC1515IS8#TRPBF SO-8 I $4.26 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 in GSM Cellular Telephones
  • Smart Card Readers
  • Local Power Supplies
  • Portable Equipment

Product Notifications

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC1515
LTC1515-3
LTC1515-3.3

Technical Support