Overview
The LDS3985M33R, produced by STMicroelectronics, is a very low drop and low noise BiCMOS linear voltage regulator. This device is capable of providing up to 300 mA of output current from an input voltage range of 2.5 V to 6 V. It is designed to be stable with both ceramic and high-quality tantalum capacitors, making it suitable for low power applications and battery-powered systems. The regulator features an ultra-low dropout voltage, low quiescent current, and low noise, which are essential for efficient power management in mobile devices and other portable electronics.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Input Voltage (VI) | 2.5 | - | 6 | V |
| Output Voltage (VO) | - | 3.3 | - | V |
| Output Current (IO) | - | 300 | - | mA |
| Dropout Voltage | - | 150 mV (at 300 mA) | - | mV |
| Quiescent Current | - | 85 µA (at no load) | 200 µA (at 300 mA load) | µA |
| Turn-on Time | - | 240 µs | - | µs |
| Output Noise Voltage | - | 30 µV RMS (10 Hz to 100 kHz) | - | µV RMS |
| Supply Voltage Rejection (SVR) | - | 55 dB (at 1 kHz), 50 dB (at 10 kHz) | - | dB |
| Operating Temperature | -40 | - | 125 | °C |
| Package | - | SOT23-5L, DFN6 (3 x 3 mm) | - | - |
Key Features
- Input voltage range 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 limit
- Low output voltage noise: 30 µV RMS over 10 Hz to 100 kHz
- Supply Voltage Rejection (SVR) of 55 dB at 1 kHz, 50 dB at 10 kHz
- Temperature range: -40 °C to 125 °C
- Automotive grade product available in DFN6 package, temperature range: -40 °C to 85 °C
Applications
The LDS3985M33R is typically used in mobile phones, battery-powered wireless systems, and portable information appliances. Its low power consumption and low noise characteristics make it ideal for applications requiring efficient and stable voltage regulation.
Q & A
- What is the input voltage range of the LDS3985M33R?
The input voltage range is from 2.5 V to 6 V.
- What is the typical dropout voltage of the LDS3985M33R?
The typical dropout voltage is 150 mV at 300 mA load and 0.4 mV at 1 mA load.
- What is the maximum output current of the LDS3985M33R?
The guaranteed output current is up to 300 mA.
- What types of capacitors can be used with the LDS3985M33R?
The device is stable with low ESR ceramic capacitors and high-quality tantalum capacitors.
- What is the quiescent current of the LDS3985M33R?
The typical quiescent current is 85 µA at no load and 200 µA at 300 mA load.
- Does the LDS3985M33R have a shutdown feature?
- What is the operating temperature range of the LDS3985M33R?
The operating temperature range is from -40 °C to 125 °C.
- What is the typical turn-on time of the LDS3985M33R?
The typical turn-on time is 240 µs.
- What is the output noise voltage of the LDS3985M33R?
The output noise voltage is 30 µV RMS over 10 Hz to 100 kHz.
- Is the LDS3985M33R available in automotive grade?
