Union Semiconductor International Limited UM1540S-28
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $1.04 | $1.04 |
| 15+ | $0.24 | $3.60 |
| 25+ | $0.23 | $5.75 |
| 50+ | $0.22 | $11.00 |
| 100+ | $0.20 | $20.00 |
| N+ | $0.04 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Union Semiconductor International Limited |
| Product Series | UM1540 |
| Packaging | Tape & Reel (TR) | |
| Output Configuration | Positive |
| Output Type | Fixed |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 6V |
| Voltage - Output (Min/Fixed) | 2.8V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 0.33V @ 200mA |
| Current - Output | 300mA |
| Current - Quiescent (Iq) | 1.5 µA |
| Current - Supply (Max) | - |
| PSRR | 56dB ~ 42dB (100Hz ~ 1kHz) |
| Control Features | Enable |
| Protection Features | Over Current, Over Temperature |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
| ROHS |  |
The UM1540S-28 is a fixed 2.8V low dropout linear regulator from Union Semiconductor, delivering up to 300mA of output current. Its ultra-low 1.5 µA quiescent current and low dropout voltage of 0.33V @ 200mA make it an excellent choice for battery-powered and portable applications. Housed in a SOT-23-5 package, this LDO provides stable and clean power with good ripple rejection, ensuring reliable performance in space-constrained designs.
- Extended Battery Life: Ultra-low 1.5 µA quiescent current minimizes standby power consumption, ideal for battery-operated devices.
- High Efficiency at Low Dropout: 0.33V dropout at 200mA allows operation from nearly depleted batteries, maximizing usable energy.
- Compact Footprint: SOT-23-5 package saves PCB space while offering additional pin options.
- Clean Output: PSRR of 56dB to 42dB (100Hz-1kHz) filters input noise, providing a stable supply for sensitive analog circuits.
Low-Voltage Digital Cores
Modern DSPs and FPGAs often require 2.8V core supplies. The UM1540S-28 provides a stable 300mA rail with low noise for reliable digital operation.
Battery-Powered GPS Modules
The low quiescent current extends battery life in portable GPS trackers, while the 2.8V output matches the requirements of many GPS receiver ICs.
Wireless Sensor Networks
In Zigbee or LoRa nodes, the UM1540S-28 ensures clean power for the radio transceiver, improving communication reliability in remote deployments.
Portable Instrumentation
For handheld multimeters and test equipment, this LDO provides a stable 2.8V reference rail with low dropout from a 3V battery.
Memory Power Supplies
Some SRAM and flash memory devices operate at 2.8V. The UM1540S-28 delivers clean power with 300mA capability for memory arrays.
- Q: What is the output voltage of the UM1540S-28?
- A: The UM1540S-28 provides a fixed output voltage of 2.8V.
- Q: What is the maximum output current?
- A: This LDO can deliver up to 300mA of continuous output current.
- Q: What is the input voltage range?
- A: The input voltage range is not explicitly specified in the provided data; please refer to the official datasheet for the full input voltage range.
- Q: What is the dropout voltage?
- A: The dropout voltage is 0.33V at a 200mA load, ensuring efficient operation with low headroom.
- Q: What is the quiescent current?
- A: The quiescent current is a very low 1.5 µA, making it ideal for battery-powered applications.
- Q: What package is the UM1540S-28 available in?
- A: It is available in the SOT-23-5 package, which offers additional pin options.
UM1540S-28.pdf
- Q: What is the output voltage of the UM1540S-28?
- A: The UM1540S-28 provides a fixed output voltage of 2.8V.
- Q: What is the maximum output current?
- A: This LDO can deliver up to 300mA of continuous output current.
- Q: What is the input voltage range?
- A: The input voltage range is not explicitly specified in the provided data; please refer to the official datasheet for the full input voltage range.
- Q: What is the dropout voltage?
- A: The dropout voltage is 0.33V at a 200mA load, ensuring efficient operation with low headroom.
- Q: What is the quiescent current?
- A: The quiescent current is a very low 1.5 µA, making it ideal for battery-powered applications.
- Q: What package is the UM1540S-28 available in?
- A: It is available in the SOT-23-5 package, which offers additional pin options.
