Overview
The LT1964EDD#TRPBF, produced by Analog Devices Inc., is a micropower low noise, low dropout negative linear regulator. This device is designed to supply up to 200mA of output current and features a low dropout voltage of 340mV. It is particularly suited for battery-powered applications due to its low quiescent current of 30μA during operation and 3μA in shutdown mode. The LT1964 is available in various packages, including the 8-lead (3mm × 3mm) Plastic DFN package, and operates over a temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | 200 | mA |
| Fixed Output Voltage | –5V | V |
| Adjustable Output Voltage Range | –1.22V to –20V | V |
| Dropout Voltage | 340 | mV |
| Quiescent Current (Operating) | 30 | μA |
| Quiescent Current (Shutdown) | 3 | μA |
| Output Noise (10Hz to 100kHz) | 30 | μVRMS |
| ADJ Pin Bias Current | 30 | nA |
| Temperature Range | –40°C to 125°C | °C |
| Package Type | 8-Lead (3mm × 3mm) Plastic DFN |
Key Features
- Low noise regulator with output noise as low as 30μVRMS over a 10Hz to 100kHz bandwidth.
- Low dropout voltage of 340mV and low quiescent current of 30μA during operation and 3μA in shutdown.
- Stable with small capacitors, including 1μF output capacitors and ceramic capacitors without additional ESR.
- Internal protection features include reverse output protection, current limiting, and thermal limiting.
- Positive or negative shutdown logic and adjustable output voltage range from –1.22V to –20V.
- Low profile packages such as ThinSOT™ and DFN).
Applications
- Battery-powered instruments and systems due to its low quiescent current and low dropout voltage).
- Noise-sensitive instrumentation requiring low noise regulators).
- Dual supply applications where the regulator load is returned to a positive supply).
- General-purpose negative voltage regulation in various electronic devices).
Q & A
- What is the maximum output current of the LT1964? The LT1964 can supply up to 200mA of output current).
- What is the fixed output voltage of the LT1964? The fixed output voltage is –5V, but it is also adjustable from –1.22V to –20V).
- What is the dropout voltage of the LT1964? The dropout voltage is 340mV).
- What is the quiescent current of the LT1964 in operating and shutdown modes? The quiescent current is 30μA during operation and 3μA in shutdown).
- Is the LT1964 stable with small capacitors? Yes, it is stable with output capacitors as low as 1μF and with ceramic capacitors without additional ESR).
- What protection features does the LT1964 have? The LT1964 includes reverse output protection, current limiting, and thermal limiting).
- What is the temperature range of the LT1964? The operating temperature range is –40°C to 125°C).
- What package types are available for the LT1964? It is available in 8-Lead (3mm × 3mm) Plastic DFN packages among others).
- How is the output voltage adjusted in the adjustable version of the LT1964? The output voltage is set by the ratio of two external resistors connected to the ADJ pin).
- What are some typical applications of the LT1964? Typical applications include battery-powered instruments, noise-sensitive instrumentation, and general-purpose negative voltage regulation).
