LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller
Features
- Greatly Reduced Conducted and Radiated EMI
- Low Switching Harmonic Content
- Independent Control of Output Switch Voltage and Current Slew Rates
- Greatly Reduced Need for External Filters
- Single N-Channel MOSFET Driver
- 20kHz to 250kHz Oscillator Frequency
- Easily Synchronized to External Clock
- Regulates Positive and Negative Voltages
- Easier Layout Than with Conventional Switchers
AEC-Q100 data available for specific packages
Typical Application
Description
The LT1738 is a switching regulator controller designed to lower conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by controlling the voltage and current slew rates of an exter-nal N-channel MOSFET switch. Current and voltage slew rates can be independently set to optimize harmonic content of the switching waveforms vs efficiency. The LT1738 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency.
The LT1738 utilizes a current mode architecture optimized for single switch topologies such as boost, flyback and Cuk. The IC includes gate drive and all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics.
Protection features include gate drive lockout for low VIN, soft-start, output current limit, short-circuit current limit-ing, gate drive overvoltage clamp and input supply undervoltage lockout.
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 |
|---|---|---|---|---|---|
| LT1738EG#PBF | SSOP-20 | G | E | 05-08-1640 (G20) | Yes |
| LT1738EG#TRPBF | SSOP-20 | G | E | 05-08-1640 (G20) | Yes |
| LT1738IG#PBF | SSOP-20 | G | I | 05-08-1640 (G20) | Yes |
| LT1738IG#TRPBF | SSOP-20 | G | I | 05-08-1640 (G20) | Yes |
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 | |
|---|---|---|---|---|---|---|
| LT1738EG#PBF | SSOP-20 | E | $4.85 | $4.10 | Yes | |
| LT1738EG#TRPBF | SSOP-20 | E | $4.20 | Yes | ||
| LT1738IG#PBF | SSOP-20 | I | $5.50 | $4.65 | Yes | |
| LT1738IG#TRPBF | SSOP-20 | I | $4.75 | Yes | ||
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC514A | LT1738EG | Ulta Low Noise Boost Regulator, Vin = 5V + / - 5%, Vout = 12V @ 1A | Contact Factory | |
| Buy Now | |||
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 | |
|---|---|---|---|---|---|---|
| LT1738IG#PBF | SSOP-20 | I | $5.50 | $4.65 | Yes | |
| LT1738IG#TRPBF | SSOP-20 | I | $4.75 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Power Supplies for Noise Sensitive Communication Equipment
- EMI Compliant Offline Power Supplies
- Precision Instrumentation Systems
- Isolated Supplies for Industrial Automation
- Medical Instruments
- Data Acquisition Systems
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Product Notifications
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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
Models for the following parts are available in LTspice:
LT1738
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
