LT8304/LT8304-1 - 100VIN Micropower No-Opto Isolated Flyback Converter with 150V/2A Switch
Features
- 3V to 100V Input Voltage Range
- 2A, 150V Internal DMOS Power Switch
- Low Quiescent Current:
116μA in Sleep Mode
390μA in Active Mode - Quasi-Resonant Boundary Mode Operation at Heavy Load
- Low Ripple Burst Mode® Operation at Light Load
- Minimum Load < 0.5% (Typ) of Full Output
- No Transformer Third Winding or Opto-Isolator
- Required for Output Voltage Regulation
- Accurate EN/UVLO Threshold and Hysteresis
- Internal Compensation and Soft-Start
- Temperature Compensation for Output Diode
- Output Short-Circuit Protection
- Thermally Enhanced 8-Lead SO Package
Typical Application
Description
The LT®8304/LT8304-1 are monolithic micropower isolated flyback converters. By sampling the isolated output voltage directly from the primary-side flyback waveform, the parts require no third winding or opto-isolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature compensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 2A, 150V DMOS power switch is integrated along with all the high voltage circuitry and control logic into a thermally enhanced 8-lead SO package.
The LT8304/LT8304-1 operate from an input voltage range of 3V to 100V and deliver up to 24W of isolated output power. The high level of integration and the use of boundary and low ripple Burst Mode operation result in a simple to use, low component count, and high efficiency application solution for isolated power delivery. The LT8304-1 is specially optimized for high step-up output applications.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT8304ES8E-1#PBF | SO-8E | S8E | E | 05-08-1857 | Yes |
| LT8304ES8E-1#TRPBF | SO-8E | S8E | E | 05-08-1857 | Yes |
| LT8304ES8E#PBF | SO-8E | S8E | E | 05-08-1857 | Yes |
| LT8304ES8E#TRPBF | SO-8E | S8E | E | 05-08-1857 | Yes |
| LT8304HS8E-1#PBF | SO-8E | S8E | H | 05-08-1857 | Yes |
| LT8304HS8E-1#TRPBF | SO-8E | S8E | H | 05-08-1857 | Yes |
| LT8304HS8E#PBF | SO-8E | S8E | H | 05-08-1857 | Yes |
| LT8304HS8E#TRPBF | SO-8E | S8E | H | 05-08-1857 | Yes |
| LT8304IS8E-1#PBF | SO-8E | S8E | I | 05-08-1857 | Yes |
| LT8304IS8E-1#TRPBF | SO-8E | S8E | I | 05-08-1857 | Yes |
| LT8304IS8E#PBF | SO-8E | S8E | I | 05-08-1857 | Yes |
| LT8304IS8E#TRPBF | SO-8E | S8E | I | 05-08-1857 | 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 | |
|---|---|---|---|---|---|---|
| LT8304ES8E-1#PBF | SO-8E | E | $5.07 | $3.55 | Yes | |
| LT8304ES8E-1#TRPBF | SO-8E | E | $5.13 | $3.61 | Yes | |
| LT8304ES8E#PBF | SO-8E | E | $5.07 | $3.55 | Yes | |
| LT8304ES8E#TRPBF | SO-8E | E | $5.13 | $3.61 | Yes | |
| LT8304HS8E-1#PBF | SO-8E | H | $6.00 | $4.20 | Yes | |
| LT8304HS8E-1#TRPBF | SO-8E | H | $6.06 | $4.26 | Yes | |
| LT8304HS8E#PBF | SO-8E | H | $6.00 | $4.20 | Yes | |
| LT8304HS8E#TRPBF | SO-8E | H | $6.06 | $4.26 | Yes | |
| LT8304IS8E-1#PBF | SO-8E | I | $5.57 | $3.90 | Yes | |
| LT8304IS8E-1#TRPBF | SO-8E | I | $5.63 | $3.96 | Yes | |
| LT8304IS8E#PBF | SO-8E | I | $5.57 | $3.90 | Yes | |
| LT8304IS8E#TRPBF | SO-8E | I | $5.63 | $3.96 | 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 |
|---|---|---|---|
| DC2393A | LT8304ES8E Isolated Demo Board | No-Opto Flyback, 18V ≤ VIN ≤ 72V; VOUT = 5V @ 2A to 4.2A | $150.00 | |
| Buy Now | |||
Applications
- Isolated Automotive, Industrial, Medical, Telecom Power Supplies
- Isolated Auxiliary/Housekeeping Power Supplies
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Design Tools
LTspice
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LT8304
Technical Support
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