LT3091 - –36V, 1.5A Negative Linear Regulator with Programmable Current Limit
Features
- Output Current: 1.5A
- Single Resistor Sets Output Voltage
- 50μA SET Pin Current: ±1% Initial Accuracy
- Programmable Current Limit
- Positive or Negative Output Current Monitor
- Parallelable for Higher Current and Heat Spreading
- Low Dropout Voltage: 300mV
- Low Output Noise: 18μVRMS (10Hz to 100kHz)
- Configurable as a 3-Terminal Floating Regulator
- Wide Input Voltage Range: –1.5V to –36V
- Rail-to-Rail Output Voltage Range: 0V to –32V
- Positive/Negative Shutdown Logic or UVLO
- Programmable Cable Drop Compensation
- Load Regulation: 1.2mV (1mA to 1.5A)
- Stable with 10μF Minimum Output Capacitor
- Stable with Ceramic or Tantalum Capacitors
- Thermally Enhanced 14-Lead 4mm × 3mm DFN, 16-Lead TSSOP, 7-Lead TO-220 and DD Packages
Typical Application
Description
The LT®3091 is a 1.5A, low dropout negative linear regulator that is easily paralleled to increase output current or spread heat on surface mounted boards. Designed with a precision current reference followed by a high performance rail-to-rail voltage buffer, this regulator finds use in applications requiring precision output, high current with no heat sink, output adjustability to zero and low dropout voltage. The device can also be configured as a 3-terminal floating regulator.
The LT3091 features fast transient response, high PSRR and output noise as low as 18μVRMS. The LT3091 generates a wide output voltage range (0V to –32V) while maintaining unity gain operation. This yields virtually constant bandwidth, load regulation, PSRR and noise, independent of the programmed output voltage.
The LT3091 supplies 1.5A at a typical dropout voltage of 300mV. Operating quiescent current is nominally 1.2mA and drops to << 1μA in shutdown. A single resistor adjusts the LT3091’s precision programmable current limit. The device’s positive or negative current monitor either sources a current (0.25mA/A) or sinks a current (0.5mA/A) proportional to output current. Built-in protection includes reverse output protection, internal current limit with foldback and thermal shutdown with hysteresis.
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 |
|---|---|---|---|---|---|
| LT3091EDE#PBF | 4x3 DFN-14 | DE | E | 05-08-1708 | Yes |
| LT3091EDE#TRPBF | 4x3 DFN-14 | DE | E | 05-08-1708 | Yes |
| LT3091EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT3091EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT3091ER#PBF | DDPAK-7 | R | E | 05-08-1462 | Yes |
| LT3091ER#TRPBF | DDPAK-7 | R | E | 05-08-1462 | Yes |
| LT3091ET7#PBF | TO-220 | T7 | E | 05-08-1422 (Standard) | Yes |
| LT3091HDE#PBF | 4x3 DFN-14 | DE | H | 05-08-1708 | Yes |
| LT3091HDE#TRPBF | 4x3 DFN-14 | DE | H | 05-08-1708 | Yes |
| LT3091HFE#PBF | TSSOP-16 | FE | H | 05-08-1663 (BC) | Yes |
| LT3091HFE#TRPBF | TSSOP-16 | FE | H | 05-08-1663 (BC) | Yes |
| LT3091HR#PBF | DDPAK-7 | R | H | 05-08-1462 | Yes |
| LT3091HR#TRPBF | DDPAK-7 | R | H | 05-08-1462 | Yes |
| LT3091HT7#PBF | TO-220 | T7 | H | 05-08-1422 (Standard) | Yes |
| LT3091IDE#PBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LT3091IDE#TRPBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LT3091IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | Yes |
| LT3091IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | Yes |
| LT3091IR#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT3091IR#TRPBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT3091IT7#PBF | TO-220 | T7 | I | 05-08-1422 (Standard) | Yes |
| LT3091MPDE#PBF | 4x3 DFN-14 | DE | MP | 05-08-1708 | Yes |
| LT3091MPDE#TR | 4x3 DFN-14 | DE | MP | 05-08-1708 | No |
| LT3091MPDE#TRPBF | 4x3 DFN-14 | DE | MP | 05-08-1708 | Yes |
| LT3091MPFE#PBF | TSSOP-16 | FE | MP | 05-08-1663 (BC) | Yes |
| LT3091MPFE#TRPBF | TSSOP-16 | FE | MP | 05-08-1663 (BC) | Yes |
| LT3091MPR#PBF | DDPAK-7 | R | MP | 05-08-1462 | Yes |
| LT3091MPR#TRPBF | DDPAK-7 | R | MP | 05-08-1462 | Yes |
| LT3091MPT7#PBF | TO-220 | T7 | MP | 05-08-1422 (Standard) | 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
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 |
|---|---|---|---|
| DC2276A | LT3091EDE Demo Board | Negative LDO with Prog Current Limit, -1.5V ≤ VIN ≤ -36V, Vout = -1.25V/-2.5V/-5V/-12V/-15V @ 1.5A | $100.00 | |
| Buy Now | |||
Applications
- Post Regulator for Switching Supplies
- Low Noise Instrumentation and RF Supplies
- Rugged Industrial Supplies
- Precision Power Supplies
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Design Tools
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LT3091
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.
