Overview
The LP3965ES-3.3/NOPB, produced by Texas Instruments, is a 1.5A fast ultra low-dropout linear voltage regulator. This device is part of the LP3962/LP3965 series, known for its high performance and suitability for low-voltage applications. The LP3965 operates from a +2.5V to +7.0V input voltage range and offers multiple preset output voltage options, including a fixed 3.3V output in this specific model. It is designed using a CMOS process, which enables low quiescent current operation independent of the output load current, making it ideal for microprocessor power supplies and other battery-powered applications.
Key Specifications
| Parameter | Typical Value | Min | Max | Units |
|---|---|---|---|---|
| Input Supply Voltage (Operating) | - | 2.5 | 7.0 | V |
| Output Voltage (Fixed) | 3.3 | 3.235 | 3.365 | V |
| Maximum Operating Current (DC) | - | - | 1.5 | A |
| Dropout Voltage at 1.5A | 380 | 380 | 550 | mV |
| Ground Pin Current at 1.5A | 5 | 5 | 15 | mA |
| Quiescent Current in Shutdown Mode | 15 | 15 | 25 | µA |
| Junction Temperature Range | - | -40 | 125 | °C |
| Short Circuit Current | - | - | 4.5 | A |
| Thermal Shutdown Threshold | 165 | - | - | °C |
Key Features
- Ultra Low Dropout Voltage: Typically 38mV at 150mA load current and 380mV at 1.5A load current.
- Low Ground Pin Current: Typically 5mA at 1.5A load current.
- High Accuracy Output Voltage: ±1.5% at room temperature and ±3.0% over all conditions.
- Overtemperature and Overcurrent Protection: Built-in thermal shutdown and short circuit protection.
- Shutdown Mode: Typically 15µA quiescent current when the shutdown pin is pulled low.
- Error Flag (LP3962): Indicates output status, goes low when the output voltage drops 10% below nominal value.
- Sense Option (LP3965): Improves load regulation at remote loads.
- Low Output Capacitor Requirements: Minimum 33µF output capacitance for stable full-load operation.
Applications
- Microprocessor Power Supplies: Suitable for powering microprocessors and other low-voltage devices.
- GTL, GTL+, BTL, and SSTL Bus Terminators: Used in various bus termination applications.
- Power Supplies for DSPs: Ideal for powering Digital Signal Processors.
- SCSI Terminator: Used in SCSI bus termination.
- Post Regulators and High Efficiency Linear Regulators: Can be used as post-regulators in switching power supplies.
- Battery Chargers and Other Battery Powered Applications: Suitable for various battery-powered systems.
Q & A
- What is the input voltage range for the LP3965ES-3.3/NOPB?
The input voltage range is from +2.5V to +7.0V.
- What is the maximum output current of the LP3965ES-3.3/NOPB?
The maximum output current is 1.5A.
- What is the typical dropout voltage at 1.5A load current?
The typical dropout voltage at 1.5A load current is 380mV.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is typically 15µA.
- Does the LP3965ES-3.3/NOPB have overtemperature protection?
- What is the minimum output capacitance required for stable operation?
The minimum output capacitance required is 33µF.
- Can the LP3965ES-3.3/NOPB be used in high-frequency applications?
While it can be used, care must be taken to ensure that high-frequency noise does not affect the regulator's performance. Good ceramic bypass capacitors and RF isolation may be necessary.
- What are the package options available for the LP3965?
The LP3965 is available in SOT-223, SFM/TO-263, and TO-220 packages.
- Does the LP3965ES-3.3/NOPB have an error flag feature?
No, the error flag feature is available in the LP3962 model, not the LP3965.
- What is the sense option in the LP3965?
The sense option in the LP3965 improves load regulation at remote loads.
