LTC3703 - 100V Synchronous Switching Regulator Controller

Features

  • High Voltage Operation: Up to 100V
  • Large 1Ω Gate Drivers
  • No Current Sense Resistor Required
  • Step-Up or Step-Down DC/DC Converter
  • Dual N-Channel MOSFET Synchronous Drive
  • Excellent Line and Load Transient Response
  • Programmable Constant Frequency: 100kHz to 600kHz
  • ±1% Reference Accuracy
  • Synchronizable up to 600kHz
  • Selectable Pulse Skip Mode Operation
  • Low Shutdown Current: 50µA Typ
  • Programmable Current Limit
  • Undervoltage Lockout
  • Programmable Soft-Start
  • 16-Pin Narrow SSOP and 28-Pin SSOP Packages

Typical Application

LTC3703 Typical Application
LTC3703 Typical Application

Description

The LTC3703 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The LTC3703 drives external N-channel MOSFETs using a constant frequency (up to 600kHz), voltage mode architecture.

A precise internal reference provides 1% DC accuracy. A high bandwidth error amplifier and patented line feed forward compensation provide very fast line and load transient response. Strong 1Ω gate drivers allow the LTC3703 to drive multiple MOSFETs for higher current applications. The operating frequency is user programmable from 100kHz to 600kHz and can also be synchronized to an external clock for noise-sensitive applications. Current limit is programmable with an external resistor and utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor. For applications requiring up to 60V operation with logiclevel MOSFETS, refer to the LTC3703-5 data sheet.

  LTC3703-5 LTC3703
Maximum VIN 60V  100V
MOSFET Gate Drive  4.5V to 15V  9.3V to 15V
VCC UV+  3.7V  8.7V
VCC UV–  3.1V  6.2V

Packaging

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

SSOP-16, SSOP-28

LTC3703 Package Drawing
LTC3703 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3703EG SSOP 28 E $4.05 $3.40 View
LTC3703EG#PBF SSOP 28 E $4.05 $3.40 View
LTC3703EG#TR SSOP 28 E $3.46 View
LTC3703EG#TRPBF SSOP 28 E $3.46 View
LTC3703EG-5 SSOP 28 E $4.05 $3.40 View
LTC3703EG-5#PBF SSOP 28 E $4.05 $3.40 View
LTC3703EG-5#TR SSOP 28 E $3.46 View
LTC3703EG-5#TRPBF SSOP 28 E $3.46 View
LTC3703EGN SSOP 16 E $3.69 $3.10 View
LTC3703EGN#PBF SSOP 16 E $3.69 $3.10 View
LTC3703EGN#TR SSOP 16 E $3.20 View
LTC3703EGN#TRPBF SSOP 16 E $3.20 View
LTC3703EGN-5 SSOP 16 E $3.69 $3.10 View
LTC3703EGN-5#PBF SSOP 16 E $3.69 $3.10 View
LTC3703EGN-5#TR SSOP 16 E $3.20 View
LTC3703EGN-5#TRPBF SSOP 16 E $3.20 View
LTC3703HGN SSOP 16 H $5.44 $3.81 View
LTC3703HGN#PBF SSOP 16 H $5.44 $3.81 View
LTC3703HGN#TR SSOP 16 H $3.87 View
LTC3703HGN#TRPBF SSOP 16 H $3.87 View
LTC3703IG-5 SSOP 28 I $5.37 $3.76 View
LTC3703IG-5#PBF SSOP 28 I $5.37 $3.76 View
LTC3703IG-5#TR SSOP 28 I $3.86 View
LTC3703IG-5#TRPBF SSOP 28 I $3.86 View
LTC3703IGN SSOP 16 I $5.09 $3.56 View
LTC3703IGN#PBF SSOP 16 I $5.09 $3.56 View
LTC3703IGN#TR SSOP 16 I $3.62 View
LTC3703IGN#TRPBF SSOP 16 I $3.62 View
LTC3703IGN-5 SSOP 16 I $5.09 $3.56 View
LTC3703IGN-5#PBF SSOP 16 I $5.09 $3.56 View
LTC3703IGN-5#TR SSOP 16 I $3.62 View
LTC3703IGN-5#TRPBF SSOP 16 I $3.62 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.

Part Number Description Price Documentation
DC501A LTC3703EGN Demo Board | High Input Voltage, Step-Down 6A Power Supply, 20 to 72Vin, 12Vout@6A $150.00
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Applications

  • 48V Telecom and Base Station Power Supplies
  • Networking Equipment, Servers
  • Automotive and Industrial Control

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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

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Models for the following parts are available in LTspice IV:
LTC3703
LTC3703-5

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