Overview
The LT3091IDE#PBF, produced by Analog Devices Inc., is a 1.5A, low dropout negative linear regulator. This device is designed for applications requiring high current, precision output, and low dropout voltage. It features a precision current reference followed by a high-performance rail-to-rail voltage buffer, making it suitable for use in various high-current and high-precision applications. The regulator can be easily paralleled to increase output current or to distribute heat on surface-mounted boards. It also supports output voltage adjustment down to zero and can be configured as a 3-terminal floating regulator.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Output Current | 1.5 | A | |||
| Dropout Voltage | VIN = VOUT(NOMINAL), ILOAD = 1mA | 300 | mV | ||
| Output Voltage Range | 0 | -32 | V | ||
| Input Voltage Range | -3.5 | -36 | V | ||
| Quiescent Current | 1.2 | mA | |||
| Shutdown Current | < 1 | µA | |||
| Operating Junction Temperature Range | E-, I-Grade | -40 | 125 | °C | |
| Output Noise (10Hz to 100kHz) | 18 | µVRMS |
Key Features
- High current capability up to 1.5A with low dropout voltage (typically 300mV).
- Wide output voltage range from 0V to -32V with adjustable output.
- Fast transient response, high PSRR, and low output noise (18µVRMS from 10Hz to 100kHz).
- Precision programmable current limit adjustable via a single resistor.
- Current monitoring capability with proportional current sourcing or sinking.
- Built-in protection features including reverse output protection, internal current limit with fold-back, and thermal shutdown with hysteresis.
- Stable operation with minimum 10µF output capacitor and compatible with ceramic or tantalum capacitors.
- Available in thermally enhanced packages such as 14-lead 4mm × 3mm DFN, 16-lead TSSOP, 7-lead TO-220, and DD packages.
Applications
- Post regulators for switching supplies.
- Low noise instrumentation and RF supplies.
- Rugged industrial supplies.
- Precision power supplies).
Q & A
- What is the maximum output current of the LT3091?
The LT3091 can supply up to 1.5A of output current).
- What is the typical dropout voltage of the LT3091?
The typical dropout voltage is 300mV).
- What is the range of output voltage for the LT3091?
The output voltage range is from 0V to -32V).
- How can the current limit be adjusted on the LT3091?
The current limit can be adjusted using a single resistor).
- What are the built-in protection features of the LT3091?
The device includes reverse output protection, internal current limit with fold-back, and thermal shutdown with hysteresis).
- What types of capacitors are compatible with the LT3091?
The LT3091 is stable with ceramic or tantalum capacitors and requires a minimum 10µF output capacitor).
- What are the available package options for the LT3091?
The device is available in 14-lead 4mm × 3mm DFN, 16-lead TSSOP, 7-lead TO-220, and DD packages).
- What is the operating junction temperature range for the LT3091?
The operating junction temperature range is -40°C to 125°C for E- and I-Grade, and -55°C to 150°C for MP-Grade, and -40°C to 150°C for H-Grade).
- How does the LT3091 handle thermal issues?
The device can be paralleled to distribute heat on surface-mounted boards and features thermal shutdown with hysteresis).
- What are some common applications of the LT3091?
Common applications include post regulators for switching supplies, low noise instrumentation and RF supplies, rugged industrial supplies, and precision power supplies).
