LTC1514 - Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator

Features

  • 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
  • Low Shutdown Current: 10µA
  • Shutdown Disconnects Load from VIN
  • Short-Circuit and Overtemperature Protected
  • 650kHz Switching Frequency
  • Low-Battery Comparator Active in Shutdown
  • Available in SO-8 Package

Typical Application

LTC1514 Typical Application
LTC1514 Typical Application

Description

The LTC1514-3.3/LTC1514-5 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 fixed at either 3.3V (LTC1514-3.3) or 5V (LTC1514-5) by an internal resistor divider.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 uncommitted comparator is kept active in shutdown. The comparator has an open-drain output for flexible interfacing.The parts are short-circuit and overtemperature protected. Battery life is maximized by very low operating currents (ICC= 60µA typ, 10µA in shutdown). Both parts are available in an SO-8 package.

Packaging

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

SO-8

LTC1514 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC1514CS8-3.3 SO 8 C $4.35 $3.50 View
LTC1514CS8-3.3#PBF SO 8 C $4.35 $3.50 View
LTC1514CS8-3.3#TR SO 8 C $3.56 View
LTC1514CS8-3.3#TRPBF SO 8 C $3.56 View
LTC1514CS8-5 SO 8 C $4.35 $3.50 View
LTC1514CS8-5#PBF SO 8 C $4.35 $3.50 View
LTC1514CS8-5#TR SO 8 C $3.56 View
LTC1514CS8-5#TRPBF SO 8 C $3.56 View
LTC1514IS8-3.3 SO 8 I $5.25 $3.50 View
LTC1514IS8-3.3#PBF SO 8 I $5.25 $3.50 View
LTC1514IS8-3.3#TR SO 8 I $3.56 View
LTC1514IS8-3.3#TRPBF SO 8 I $3.56 View
LTC1514IS8-5 SO 8 I $5.25 $3.50 View
LTC1514IS8-5#PBF SO 8 I $5.25 $3.50 View
LTC1514IS8-5#TR SO 8 I $3.56 View
LTC1514IS8-5#TRPBF SO 8 I $3.56 View
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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

  • Battery Operated Equipment
  • Smart Card Readers
  • Local Power Supplies
  • Handheld Instruments
  • Battery Backup Supplies

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Design Tools

LTspiceIV

LTspice IV 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 IV

Models for the following parts are available in LTspice IV:
LTC1514-3.3
LTC1514-5

Technical Support