Overview
The LT1963AES8-3.3 is a low dropout (LDO) voltage regulator from Linear Technology, now part of Analog Devices. This regulator is optimized for fast transient response and is designed to supply up to 1.5A of output current. It features a low dropout voltage of 340mV, making it suitable for a wide range of applications requiring stable and efficient power supply. The device is available in an 8-lead SO package and operates over a temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Output Current | 1.5A | |
| Dropout Voltage | 340mV | |
| Output Voltage | 3.3V (Fixed) | Also available in 1.5V, 1.8V, 2.5V, and adjustable from 1.21V to 20V |
| Quiescent Current | 1mA (Operating), <1µA (Shutdown) | |
| Output Noise | 40µVRMS (10Hz to 100kHz) | |
| Minimum Input Voltage | 4.3V for 3.3V output | VIN must be at least VOUT + dropout voltage |
| Output Capacitor Stability | Stable with 10µF output capacitor | Ceramic, tantalum, or aluminum electrolytic capacitors |
| Protection Features | Reverse battery protection, current limiting, thermal limiting, no reverse current | |
| Package | 8-Lead SO | |
| Operating Temperature Range | –40°C to 125°C |
Key Features
- Optimized for fast transient response
- Low dropout voltage of 340mV
- Low output noise: 40µVRMS (10Hz to 100kHz)
- Quiescent current of 1mA, dropping to <1µA in shutdown
- No protection diodes needed
- Controlled quiescent current in dropout
- Stable with output capacitors as low as 10µF
- Internal protection circuitry including reverse battery protection, current limiting, thermal limiting, and no reverse current
Applications
- Sensitive RF supply applications due to low output noise
- Post-regulator for switching supplies
- Logic power supplies (e.g., 3.3V to 2.5V conversion)
- Automotive applications (AEC-Q100 qualified)
- General-purpose power supply in systems requiring high current and low dropout voltage
Q & A
- What is the maximum output current of the LT1963AES8-3.3?
The maximum output current is 1.5A.
- What is the dropout voltage of the LT1963AES8-3.3?
The dropout voltage is 340mV.
- What is the output voltage of the LT1963AES8-3.3?
The output voltage is fixed at 3.3V, but the LT1963 series also offers other fixed voltages and an adjustable option.
- What is the quiescent current of the LT1963AES8-3.3 in operating and shutdown modes?
The quiescent current is 1mA in operating mode and less than 1µA in shutdown mode.
- What type of output capacitors can be used with the LT1963AES8-3.3?
The regulator is stable with output capacitors as low as 10µF, including ceramic, tantalum, or aluminum electrolytic capacitors.
- Does the LT1963AES8-3.3 have built-in protection features?
Yes, it includes reverse battery protection, current limiting, thermal limiting, and no reverse current protection.
- In what package is the LT1963AES8-3.3 available?
The device is available in an 8-lead SO package.
- What is the operating temperature range of the LT1963AES8-3.3?
The operating temperature range is –40°C to 125°C.
- Is the LT1963AES8-3.3 suitable for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications.
- Why is the LT1963AES8-3.3 ideal for sensitive RF supply applications?
It is ideal due to its very low output noise of 40µVRMS (10Hz to 100kHz).
