LT4430 - Secondary-Side Optocoupler Driver

Features

  • 600mV Reference (1.25% Over Temperature)
  • Wide Input Supply Range: 3V to 20V
  • Overshoot Control Function Prevents Output Overshoot on Start-Up and Short-Circuit Recovery
  • High Bandwidth Error Amplifier Permits Simple Loop Frequency Compensation
  • Ground-Referenced Opto-Coupler Drive
  • 10mA Opto-Coupler Drive with Current Limiting
  • Low Profile (1mm) ThinSOTTM Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT4430 Typical Application
LT4430 Typical Application

Description

The LT®4430 drives the opto-coupler that crosses the galvanic barrier in an isolated power supply. The IC contains a precision-trimmed reference, a high bandwidth error amplifier, an inverting gain of 6 stage to drive the optocoupler and unique overshoot control circuitry.

The LT4430’s 600mV reference provides ±0.75% initial accuracy and ±1.25% tolerance over temperature. A high bandwidth 9MHz error amplifier permits simple frequency compensation and negligible phase shift at typical loop crossover frequencies. The opto-coupler driver provides 10mA of output current and is short-circuit protected. A unique overshoot control function prevents output overshoot on start-up and short-circuit recovery with a single capacitor.

The LT4430 is available in the low profile 6-lead TSOT-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
LT4430ES6#PBF SOT-23 S6 E 05-08-1636 Yes
LT4430ES6#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LT4430ES6#TRPBF SOT-23 S6 E 05-08-1636 Yes
LT4430HS6#PBF SOT-23 S6 H 05-08-1636 Yes
LT4430HS6#TRMPBF SOT-23 S6 H 05-08-1636 Yes
LT4430HS6#TRPBF SOT-23 S6 H 05-08-1636 Yes
LT4430IS6#PBF SOT-23 S6 I 05-08-1636 Yes
LT4430IS6#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LT4430IS6#TRPBF SOT-23 S6 I 05-08-1636 Yes
LT4430MPS6#PBF SOT-23 S6 MP 05-08-1636 Yes
LT4430MPS6#TRMPBF SOT-23 S6 MP 05-08-1636 Yes
LT4430MPS6#TRPBF SOT-23 S6 MP 05-08-1636 Yes


LT4430 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
LT4430ES6#PBF SOT-23 E $2.14 Yes
LT4430ES6#TRMPBF SOT-23 E $2.14 $1.83 Yes
LT4430ES6#TRPBF SOT-23 E $2.14 $1.81 Yes
LT4430HS6#PBF SOT-23 H $3.13 Yes
LT4430HS6#TRMPBF SOT-23 H $3.13 $2.24 Yes
LT4430HS6#TRPBF SOT-23 H $3.13 $2.19 Yes
LT4430IS6#PBF SOT-23 I $2.70 Yes
LT4430IS6#TRMPBF SOT-23 I $2.70 $1.94 Yes
LT4430IS6#TRPBF SOT-23 I $2.70 $1.89 Yes
LT4430MPS6#PBF SOT-23 MP $7.31 Yes
LT4430MPS6#TRMPBF SOT-23 MP $7.31 $5.17 Yes
LT4430MPS6#TRPBF SOT-23 MP $7.31 $5.12 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
DC968A-A LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=34V-75V Vout=3.3V @ 30A $150.00
DC968A-B LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=18V-36V, Vout=5V @ 20A $175.00
DC968A-C LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=36V-75V, Vout=12V @ 12A $150.00
DC968A-D LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | Vin=36V-75V, Vout=28V @ 4A $175.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data 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
LT4430HS6#PBF SOT-23 H $3.13 Yes
LT4430HS6#TRMPBF SOT-23 H $3.13 $2.24 Yes
LT4430HS6#TRPBF SOT-23 H $3.13 $2.19 Yes
LT4430IS6#PBF SOT-23 I $2.70 Yes
LT4430IS6#TRMPBF SOT-23 I $2.70 $1.94 Yes
LT4430IS6#TRPBF SOT-23 I $2.70 $1.89 Yes
LT4430MPS6#PBF SOT-23 MP $7.31 Yes
LT4430MPS6#TRMPBF SOT-23 MP $7.31 $5.17 Yes
LT4430MPS6#TRPBF SOT-23 MP $7.31 $5.12 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

  • 48V Input Isolated DC/DC Converters
  • Isolated Telecommunication Power Systems
  • Distributed Power Step-Down Converters
  • Offline Isolated Power Supplies
  • Industrial Control Systems
  • Automotive and Heavy Equipment

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Design Tools

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Models for the following parts are available in LTspice:
LT4430

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