LTC3704 - Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller

Features

  • High Efficiency Operation (No Sense Resistor Required)
  • Wide Input Voltage Range: 2.5V to 36V
  • Current Mode Control Provides Excellent Transient Response
  • High Maximum Duty Cycle (Typ 92%)
  • ±1% Internal Voltage Reference
  • ±2% RUN Pin Threshold with 100mV Hysteresis
  • Micropower Shutdown: IQ = 10µA
  • Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
  • Synchronizable to an External Clock Up to 1.3 x fOSC
  • User-Controlled Pulse Skip or Burst Mode® Operation
  • Internal 5.2V Low Dropout Voltage Regulator
  • Capable of Operating with a Sense Resistor for High Output Voltage Applications (VDS>36V)
  • Small 10-Lead MSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3704 Typical Application
LTC3704 Typical Application

Description

The LTC3704 is a wide input range, current mode, positive-to-negative DC/DC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to high power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency.

The IC’s operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10µA make the LTC3704 ideally suited for battery-operated systems.

For applications requiring constant frequency operation, the Burst Mode operation feature can be defeated using the MODE/SYNC pin. Higher than 36V switch voltage applications are possible with the LTC3704 by connecting the SENSE pin to a resistor in the source of the power MOSFET.

The LTC3704 is available in the 10-lead MSOP 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
LTC3704EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC3704EMS#TRPBF MS-10 MS E 05-08-1661 Yes
LTC3704IMS#PBF MS-10 MS I 05-08-1661 Yes
LTC3704IMS#TRPBF MS-10 MS I 05-08-1661 Yes


LTC3704 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
LTC3704EMS#PBF MS-10 E $2.68 $1.85 Yes
LTC3704EMS#TRPBF MS-10 E $1.91 Yes
LTC3704IMS#PBF MS-10 I $2.93 $2.05 Yes
LTC3704IMS#TRPBF MS-10 I $2.11 Yes
Buy NowRequest Samples
* 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
DC518A LTC3704EMS Demo Board | 4.5V to 15Vin, -70Vout1 @ 200mA, -24Vout2 @ 200mA $125.00
DC524A LTC3704EMS Demo Board | Positive to Negative Converter, 5V to 15Vin, -5.2Vout @ 2.5A $125.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3704IMS#PBF MS-10 I $2.93 $2.05 Yes
LTC3704IMS#TRPBF MS-10 I $2.11 Yes
Buy NowRequest Samples
* 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.

Applications

  • SLIC Power Supplies
  • Telecom Power Supplies
  • Portable Electronic Equipment
  • Cable and DSL Modems
  • Router Supplies

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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

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC3704

Technical Support