VideosDocumentationDatasheet
Reliability Data
LT Journal
Press Release
cad_symbol
ltspice
Features
- Output Current: 600mA
- 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 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 600mA)
- Stable with 4.7μF Minimum Output Capacitor
- Stable with Ceramic or Tantalum Capacitors
- Thermally Enhanced 12-Lead MSOP and 10-Lead 0.75mm × 3mm × 3mm DFN Packages
Typical Application
Description
The LT®3090 is a 600mA, low dropout negative linear regulator that is easily parallelable 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 LT3090 features fast transient response, high PSRR and output noise as low as 18μVRMS. The LT3090 generates a wide output voltage range (0V to –32V) while maintaining unity gain operation. This yields virtually constant bandwidth, load regulation, PSRR and noise, regardless of the programmed output voltage.
The LT3090 supplies 600mA at a typical dropout voltage of 300mV. Operating quiescent current is nominally 1mA and drops to << 1μA in shutdown. A single resistor adjusts the LT3090’s precision programmable current limit. The LT3090’s positive or negative current monitor either sources a current (0.5mA/A) or sinks a current (1mA/A) proportional to output current. Built-in protection includes reverse output protection, internal current limit with foldback and thermal shutdown with hysteresis.
3x3 DFN-10,MS-12E
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3090EDD#PBF | DFN | 10 | E | $3.07 | $2.15 |
| LT3090EDD#TRPBF | DFN | 10 | E | $2.21 | |
| LT3090EMSE#PBF | MSOP | 12 | E | $3.07 | $2.15 |
| LT3090EMSE#TRPBF | MSOP | 12 | E | $2.21 | |
| LT3090HDD#PBF | DFN | 10 | H | $4.14 | $2.90 |
| LT3090HDD#TRPBF | DFN | 10 | H | $2.96 | |
| LT3090HMSE#PBF | MSOP | 12 | H | $4.14 | $2.90 |
| LT3090HMSE#TRPBF | MSOP | 12 | H | $2.96 | |
| LT3090IDD#PBF | DFN | 10 | I | $3.57 | $2.50 |
| LT3090IDD#TRPBF | DFN | 10 | I | $2.56 | |
| LT3090IMSE#PBF | MSOP | 12 | I | $3.57 | $2.50 |
| LT3090IMSE#TRPBF | MSOP | 12 | I | $2.56 | |
| LT3090MPDD#PBF | DFN | 10 | MP | $8.29 | $5.80 |
| LT3090MPDD#TRPBF | DFN | 10 | MP | $5.86 | |
| LT3090MPMSE#PBF | MSOP | 12 | MP | $8.29 | $5.80 |
| LT3090MPMSE#TRPBF | MSOP | 12 | MP | $8.35 | $5.86 |
| LT3090MPMSE | MSOP | 12 | MP | $8.29 | $5.80 |
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 |
|---|---|---|---|
| DC1948A | LT3090 Demo Board | Negative Linear Regulator with Prog Current Limit, -1.5V ≤ VIN ≤ -36V, Vout = -1.25V/-2.5V/-5V/-12V/-15V/-18V @ 600mA | $100.00 |