Overview
The LD39300PT33-R is an ultra-low drop linear voltage regulator produced by STMicroelectronics. This device operates from a 2.5V to 6V input supply and is designed to provide a stable output voltage of 3.3V. The LD39300 series is known for its fast dynamic response to line and load changes, making it suitable for various low-voltage applications, including microprocessor and memory power supplies.
The regulator features a BiCMOS process, which allows for low quiescent current operation independent of the output load current. It also includes logic-controlled electronic shutdown, current and thermal internal limits, and a very low dropout voltage.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Operating Input Voltage (VI) | 2.5 | 6 | V | |
| Output Voltage (VO) | 3.3 | V | ||
| Output Voltage Tolerance | -1.5% | 1.5% | % of VO(NOM) | |
| Guaranteed Output Current | 3 | A | ||
| Dropout Voltage (VI - VO) at 3A | 200 | 400 | mV | |
| Quiescent Current (ON MODE) | 1.2 | 2.5 | mA | |
| Quiescent Current (OFF MODE) | 1 | µA | ||
| Operating Junction Temperature Range | -40 | 125 | °C | |
| Thermal Resistance Junction-Ambient (RthJA) | 100 | °C/W |
Key Features
- Ultra-low dropout voltage (200mV typ. @ 3A load, 40mV typ. @ 600mA load)
- Very low quiescent current (1.2mA typ. @ 3A load, 1µA max @ 25°C in off mode)
- Logic-controlled electronic shutdown
- Current and thermal internal limits
- ±1.5% Output voltage tolerance @ 25°C
- Fast dynamic response to line and load changes
- Stable with ceramic capacitor
- Available in PPAK and DPAK packages
Applications
- Microprocessor power supply
- DSPs power supply
- Post regulators for switching suppliers
- High efficiency linear regulator
Q & A
- What is the input voltage range for the LD39300PT33-R?
The input voltage range is from 2.5V to 6V.
- What is the output voltage of the LD39300PT33-R?
The output voltage is 3.3V.
- What is the typical dropout voltage at 3A load?
The typical dropout voltage at 3A load is 200mV.
- What is the quiescent current in ON mode?
The quiescent current in ON mode is typically 1.2mA.
- What is the quiescent current in OFF mode?
The quiescent current in OFF mode is typically 1µA.
- What are the package options for the LD39300PT33-R?
The device is available in PPAK and DPAK packages.
- What is the operating junction temperature range?
The operating junction temperature range is from -40°C to 125°C.
- How is the inhibit feature controlled?
The inhibit feature is controlled by the inhibit input voltage; the device is ON when VINH ≥ 2V and OFF when VINH ≤ 0.3V.
- What type of capacitors are recommended for stability?
Ceramic or Tantalum capacitors are recommended, with specific requirements for minimum capacitance and equivalent series resistance (ESR).
- What are some typical applications for the LD39300PT33-R?
Typical applications include microprocessor power supply, DSPs power supply, post regulators for switching suppliers, and high efficiency linear regulator.
