Overview
The LDS3985M30R, produced by STMicroelectronics, is a very low drop and low noise BiCMOS 300 mA voltage regulator. This device is designed to provide a stable output voltage from an input voltage range of 2.5 V to 6 V. It is particularly suited for low power applications and battery-powered systems due to its ultra-low dropout voltage, low quiescent current, and low noise characteristics. The regulator features a logic-controlled electronic shutdown, internal current and thermal limits, and a fast turn-on time, making it ideal for mobile phones, wireless systems, and portable information appliances.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage | 2.5 to 6 | V |
| Output Voltage (nominal) | 3.0 | V |
| Output Current (nominal) | 0.3 | A |
| Dropout Voltage (typ.) | 150 mV at 300 mA load, 0.4 mV at 1 mA load | mV |
| Quiescent Current (typ.) | 85 µA at no load, 200 µA at 300 mA load; max. 1.5 µA in OFF mode | µA |
| Turn-on Time (typ.) | 240 µs | µs |
| Output Noise Voltage (typ.) | 30 µV RMS over 10 Hz to 100 kHz | µV RMS |
| Supply Voltage Rejection (SVR) | 55 dB at 1 kHz, 50 dB at 10 kHz | dB |
| Operating Temperature Range | -40 to 125 °C | °C |
| Package | SOT23-5L |
Key Features
- Input voltage from 2.5 V to 6 V
- Stable with low ESR ceramic capacitors
- Very low dropout voltage (150 mV typ. at 300 mA load, 0.4 mV typ. at 1 mA load)
- Very low quiescent current (85 µA typ. at no load, 200 µA typ. at 300 mA load; max. 1.5 µA in OFF mode)
- Guaranteed output current up to 300 mA
- Wide range of output voltages available on request: fixed from 1.25 V to 5 V with 100 mV step
- Fast turn-on time: typ. 240 µs
- Logic-controlled electronic shutdown
- Internal current and thermal limits
- Low output voltage noise: 30 µV RMS over 10 Hz to 100 kHz
- SVR of 55 dB at 1 kHz, 50 dB at 10 kHz
Applications
The LDS3985M30R is typically used in:
- Mobile phones and similar battery-powered wireless systems
- Portable information appliances
- Low power applications and battery-powered systems
Q & A
- What is the input voltage range of the LDS3985M30R?
The input voltage range is from 2.5 V to 6 V.
- What is the typical dropout voltage of the LDS3985M30R?
The typical dropout voltage is 150 mV at 300 mA load and 0.4 mV at 1 mA load.
- What is the quiescent current of the LDS3985M30R?
The quiescent current is typically 85 µA at no load and 200 µA at 300 mA load, with a maximum of 1.5 µA in OFF mode.
- What is the guaranteed output current of the LDS3985M30R?
The guaranteed output current is up to 300 mA.
- What is the turn-on time of the LDS3985M30R?
The turn-on time is typically 240 µs.
- Does the LDS3985M30R have a shutdown feature?
- What is the output noise voltage of the LDS3985M30R?
The output noise voltage is typically 30 µV RMS over 10 Hz to 100 kHz.
- What is the operating temperature range of the LDS3985M30R?
The operating temperature range is from -40 °C to 125 °C.
- In what package is the LDS3985M30R available?
The LDS3985M30R is available in the SOT23-5L package.
- What are the typical applications of the LDS3985M30R?
Typical applications include mobile phones, battery-powered wireless systems, and portable information appliances.
