Overview
The LT1764AEQ-1.8 is a low dropout (LDO) voltage regulator produced by Linear Technology, now part of Analog Devices. This regulator is optimized for fast transient response and is capable of supplying up to 3A of output current. It features a low dropout voltage of 340mV at 3A, making it suitable for a wide range of applications requiring stable and efficient power supply.
The device is available in various packages, including 5-lead TO-220, DD, and 16-lead FE packages, offering flexibility in design and implementation. The LT1764AEQ-1.8 is particularly noted for its low noise characteristics, with an output voltage noise of 40µVRMS (10Hz to 100kHz), which is ideal for sensitive RF supply applications.
Key Specifications
| Specification | Value |
|---|---|
| Output Current | 3A |
| Dropout Voltage | 340mV at 3A |
| Output Voltage Noise | 40µVRMS (10Hz to 100kHz) |
| Quiescent Current | 1mA (operating), <1µA (shutdown) |
| Input Voltage Range | 2.7V to 20V |
| Fixed Output Voltage | 1.8V (for LT1764AEQ-1.8) |
| Adjustable Output Range | 1.21V to 20V (for adjustable versions) |
| Output Capacitor Stability | Stable with 10µF output capacitor, ceramic capacitors |
| Protection Features | Reverse battery protection, current limiting, thermal limiting, no reverse current |
| Operating Junction Temperature Range | -40°C to 125°C (E Grade), -55°C to 125°C (MP Grade) |
Key Features
- Optimized for fast transient response
- Low dropout voltage of 340mV at 3A
- Low output voltage noise of 40µVRMS (10Hz to 100kHz)
- Quiescent current of 1mA, dropping to <1µA in shutdown
- Wide input voltage range of 2.7V to 20V
- No protection diodes needed
- Controlled quiescent current in dropout
- Stable with 10µF output capacitor and ceramic capacitors
- Internal protection circuitry including reverse battery protection, current limiting, thermal limiting, and no reverse current
Applications
- Sensitive RF supply applications due to low noise characteristics
- Logic power supplies (e.g., 3.3V to 2.5V)
- Post-regulators for switching supplies
- General-purpose power supply applications requiring high current and low dropout voltage
Q & A
- What is the maximum output current of the LT1764AEQ-1.8?
The maximum output current is 3A.
- What is the dropout voltage of the LT1764AEQ-1.8 at 3A?
The dropout voltage is 340mV at 3A.
- What is the quiescent current of the LT1764AEQ-1.8 in operating and shutdown modes?
The quiescent current is 1mA in operating mode and <1µA in shutdown mode.
- What is the input voltage range of the LT1764AEQ-1.8?
The input voltage range is 2.7V to 20V.
- Is the LT1764AEQ-1.8 stable with ceramic capacitors?
- What protection features does the LT1764AEQ-1.8 have?
The device includes reverse battery protection, current limiting, thermal limiting, and no reverse current protection.
- What are the typical applications of the LT1764AEQ-1.8?
Typical applications include sensitive RF supply applications, logic power supplies, post-regulators for switching supplies, and general-purpose power supply applications.
- What are the available package types for the LT1764AEQ-1.8?
The device is available in 5-lead TO-220, DD, and 16-lead FE packages.
- What is the operating junction temperature range for the LT1764AEQ-1.8?
The operating junction temperature range is -40°C to 125°C for E Grade and -55°C to 125°C for MP Grade.
- Does the LT1764AEQ-1.8 require external protection diodes?
No, the LT1764AEQ-1.8 does not require external protection diodes.
