Technical Specifications
Parameters and characteristics for this part
| Specification | L7981TR |
|---|---|
| Current - Output | 3 A |
| Frequency - Switching [Max] | 1 MHz |
| Frequency - Switching [Min] | 250 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 150 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Package / Case | 8-VFDFN Exposed Pad |
| Supplier Device Package | 8-VFQFPN (3x3) |
| Synchronous Rectifier | False |
| Topology | Buck |
| Voltage - Input (Max) [Max] | 28 V |
| Voltage - Input (Min) [Min] | 4.5 V |
| Voltage - Output (Max) | 28 V |
| Voltage - Output (Min/Fixed) | 0.6 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 1.99 | |
| 10 | $ 1.47 | |||
| 25 | $ 1.33 | |||
| 100 | $ 1.19 | |||
| 250 | $ 1.12 | |||
| 500 | $ 1.08 | |||
| 1000 | $ 1.05 | |||
| Digi-Reel® | 1 | $ 1.99 | ||
| 10 | $ 1.47 | |||
| 25 | $ 1.33 | |||
| 100 | $ 1.19 | |||
| 250 | $ 1.12 | |||
| 500 | $ 1.08 | |||
| 1000 | $ 1.05 | |||
| Tape & Reel (TR) | 4000 | $ 1.00 | ||
| 8000 | $ 0.98 | |||
| Newark | Each (Supplied on Cut Tape) | 1 | $ 2.51 | |
| 10 | $ 1.99 | |||
| 25 | $ 1.85 | |||
| 50 | $ 1.78 | |||
| 100 | $ 1.71 | |||
| 250 | $ 1.64 | |||
| 500 | $ 1.60 | |||
| 1000 | $ 1.57 | |||
Description
General part information
L7981 Series
The L7981 device is a step-down switching regulator with a 3.7 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditions.The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.The QFN and the HSOP packages with exposed pad allow reducing the RthJAdown to 60°C/W and 40°C/W respectively.3 A DC output current4.5 V to 28 V input voltageOutput voltage adjustable from 0.6 V250 kHz switching frequency, programmable up to 1 MHzInternal soft-start and enableLow dropout operation: 100% duty cycleVoltage feed-forwardZero load current operationOvercurrent and thermal protectionVFQFPN 3 x 3 - 8L and HSOP8 package