LT1613

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1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23

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Overview

  • Uses Tiny Capacitors and Inductor
  • Internally Compensated
  • Fixed Frequency 1.4MHz Operation
  • Operates with VIN as Low as 1.1V
  • 3V at 30mA from a Single Cell
  • 5V at 200mA from 3.3V Input
  • 15V at 60mA from Four Alkaline Cells
  • High Output Voltage: Up to 34V
  • Low Shutdown Current: <1µA
  • Low VCESAT Switch: 300mV at 300mA
  • 5-Lead SOT-23 Package

The LT1613 is the industry’s first 5-lead SOT-23 current mode DC/DC converter. Intended for small, low power applications, it operates from an input voltage as low as 1.1V and switches at 1.4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Its small size and high switching frequency enables the complete DC/DC converter function to take up less than 0.2 square inches of PC board area. Multiple output power supplies can now use a separate regulator for each output voltage, replacing cumbersome quasi-regulated approaches using a single regulator and a custom transformer.

A constant frequency, internally compensated current mode PWM architecture results in low, predictable output noise that is easy to filter. The high voltage switch on the LT1613 is rated at 36V, making the device ideal for boost converters up to 34V as well as for Single-Ended Primary Inductance Converter (SEPIC) and flyback designs. The device can generate 5V at up to 200mA from a 3.3V supply or 5V at 175mA from four alkaline cells in a SEPIC design.

The LT1613 is available in the 5-lead SOT-23 package.

Applications

  • Digital Cameras
  • Pagers
  • Cordless Phones
  • Battery Backup
  • LCD Bias
  • Medical Diagnostic Equipment
  • Local 5V or 12V Supply
  • External Modems
  • PC Cards
LT1613
1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
Figure 1. 3.3V to 5V 200mA DC/DC Converter Efficiency Curve Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Design Note 2

Technical Articles 4

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT1613
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC233A

LT1613CS5 LT1611CS5 | 1.4MHz, SOT-23 DC-DC Converter, 3 Circuits: LT1613 Boost and SEPIC, LT1611 Inverter

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Product Details

The LT1611 and LT1613 are 5-lead SOT-23, current mode DC/DC converters. Intended for small, low power applications, both operate from inputs as low as 1V and switch at 1.4MHz, allowing the use of tiny, low cost capacitors and inductors. DC233 contains three switching regulator circuits. Two of these demonstrate the use of the LT1613CS5 in a simple boost regulator circuit and in an uncoupled SEPIC circuit. Both circuits produce 3.3V or 5V (jumper selected). The boost circuit produces 200mA in a typical application and occupies less than 0.2 square inches of circuit board area. The SEPIC circuit allows operation from input voltages either higher or lower than the output, making this circuit suitable for single Li-Ion cell to 3.3V conversion or four alkaline cells to 5V conversion. Typical output current for the SEPIC circuit is 120mA. The third circuit demonstrates the LT1611CS5 in a low noise inverting circuit. This circuit can convert 5V to –5V at 160mA.
DC233A
LT1613CS5 LT1611CS5 | 1.4MHz, SOT-23 DC-DC Converter, 3 Circuits: LT1613 Boost and SEPIC, LT1611 Inverter
DC233A - Schematic

Latest Discussions

4 Years Ago
Please analyze this circuit of LT1613
6 Years Ago
There is a problem when I add a voltage doubling circuit in a DCDC boost circuit output with LT1618, help! Thank you.
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