LT1935 - 1.2MHz Boost DC/DC Converter in ThinSOT with 2A Switch

Features

  • 1.2MHz Switching Frequency
  • High Output Voltage: Up to 38V
  • Wide Input Range: 2.3V to 16V
  • Low VCESAT Switch: 180mV at 2A
  • Soft-Start
  • Uses Small Surface Mount Components
  • 5V at 1A from 3.3V Input
  • 12V at 600mA from 5V Input
  • Low Shutdown Current: <1µA
  • Pin-for-Pin Compatible with the LT1613 and LT1930
  • Low Profile (1mm) SOT-23 (ThinSOT™) Package

Typical Application

LT1935 Typical Application
LT1935 Typical Application

Description

The LT1935 is the industry’s highest power SOT-23 switching regulator. Its unprecedented 2A, 40V internal switch allows high output currents to be generated in a small footprint. Intended for space-conscious applications, the LT1935 switches at 1.2MHz, allowing the use of tiny, low profile inductors and capacitors 2mm or less in height. The NPN switch achieves a VCESAT of just 180mV at 2A independent of supply voltage, resulting in high efficiency even at maximum power levels from a 3V input.

A constant frequency, internally compensated, current mode PWM architecture results in low, predictable output noise that is easy to filter. Low ESR ceramic capacitors can be used on the output, further reducing noise to the millivolt level. The high voltage switch on the LT1935 is rated at 40V, making the device ideal for boost converters up to 38V as well as for single-ended primary inductance converter (SEPIC) and flyback designs. The device can generate 5V at up to 1A from a 3.3V supply or 5V at 550mA from four alkaline cells in a SEPIC design.

The LT1935 is available in a 5-lead SOT-23 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
LT1935ES5#PBF SOT-23 S5 E 05-08-1635 Yes
LT1935ES5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LT1935ES5#TRPBF SOT-23 S5 E 05-08-1635 Yes


LT1935 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
LT1935ES5#PBF SOT-23 E $2.96 Yes
LT1935ES5#TRMPBF SOT-23 E $2.96 $2.52 Yes
LT1935ES5#TRPBF SOT-23 E $2.96 $2.50 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.

Part Number Description Price Documentation
DC683A LT1935ES5 Demo Board | 3.3V to 5.5V Input, VOUT = 12V at up to 600mA $125.00
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Click here to view our complete list of demo boards

Applications

  • Digital Cameras
  • Battery Backup
  • LCD Bias
  • Local 5V or 12V Supply
  • PC Cards
  • xDSL Power Supply
  • TFT-LCD Bias Supply

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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

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LT1935

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