Union Semiconductor International Limited UM1540DB-18
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $1.28 | $1.28 |
| 15+ | $0.29 | $4.35 |
| 25+ | $0.29 | $7.25 |
| 50+ | $0.27 | $13.50 |
| 100+ | $0.24 | $24.00 |
| N+ | $0.05 | 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) | 1.8V |
| 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 | 4-XDFN Exposed Pad |
| Supplier Device Package | 4-DFN (1x1) |
| ROHS |  |
The UM1540DB-18 from Union Semiconductor is a low dropout linear regulator providing a fixed 1.8V output at up to 300mA. Its standout feature is an ultra-low quiescent current of just 1.5 µA, making it exceptional for battery-powered and energy-harvesting applications. The compact 4-DFN (1x1) package is designed for space-constrained PCBs.
- Ultra-Low Power Consumption: 1.5 µA quiescent current dramatically extends battery life in standby mode.
- High Output Current: 300mA capability supports a wide range of low-power peripherals.
- Miniature Footprint: The 1x1mm DFN package saves critical board space in compact designs.
- Efficient Operation: Low dropout voltage (0.33V @ 200mA) maximizes usable battery capacity.
Energy-Harvesting Systems
The ultra-low 1.5 µA quiescent current makes the UM1540DB-18 perfect for energy-harvesting applications like solar-powered sensors, where every microamp of standby current directly impacts system viability.
Battery-Powered Wearables
With a tiny 1x1mm DFN package and 300mA output capability, this regulator suits fitness trackers and smartwatches, providing a stable 1.8V rail for low-power MCUs and sensors.
Always-On IoT Devices
For IoT nodes that must remain in listening mode for extended periods, the 1.5 µA quiescent current ensures minimal battery drain while maintaining a ready state.
Portable Medical Monitors
The low dropout of 0.33V at 200mA allows efficient operation from a single Li-ion cell, making it suitable for continuous glucose monitors and portable pulse oximeters.
RTC and Memory Backup Circuits
The low quiescent current and small footprint make it ideal for maintaining power to real-time clocks and SRAM in battery-backed applications.
- Q: What is the output voltage of the UM1540DB-18?
- A: The fixed output voltage is 1.8V.
- Q: What is the maximum output current?
- A: It can deliver up to 300mA.
- Q: What is the input voltage range?
- A: The input voltage range is not specified in the provided data; refer to the datasheet.
- Q: What is the dropout voltage?
- A: The dropout voltage is 0.33V at 200mA load.
- Q: What is the quiescent current?
- A: The quiescent current is extremely low at 1.5 µA.
- Q: What package is available?
- A: It comes in a 4-DFN (1x1) package.
UM1540DB-18.pdf
- Q: What is the output voltage of the UM1540DB-18?
- A: The fixed output voltage is 1.8V.
- Q: What is the maximum output current?
- A: It can deliver up to 300mA.
- Q: What is the input voltage range?
- A: The input voltage range is not specified in the provided data; refer to the datasheet.
- Q: What is the dropout voltage?
- A: The dropout voltage is 0.33V at 200mA load.
- Q: What is the quiescent current?
- A: The quiescent current is extremely low at 1.5 µA.
- Q: What package is available?
- A: It comes in a 4-DFN (1x1) package.
