LT3081HFE#PBF
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| Mfr | Analog Devices Inc. |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 140°C |
| Voltage - Input (Max) | 36V |
| Output Type | Adjustable |
| Current - Output | 1.5A |
| Supplier Device Package | 16-TSSOP-EP |
| Output Configuration | Positive |
| Current - Quiescent (Iq) | 50 µA |
| Current - Supply (Max) | 5 mA |
| Control Features | Current Limit |
| Voltage - Output (Min/Fixed) | 0V |
| Voltage - Output (Max) | 34.5V |
| Number of Regulators | 1 |
| Protection Features | Over Current, Over Temperature, Reverse Polarity, Short Circuit |
| PSRR | 90dB ~ 20dB (120Hz ~ 1MHz) |
| Voltage Dropout (Max) | 1.5V @ 1.5A |
| Package | Tube |
| Product Status | Active |
| Base Product Number | LT3081 |
| REACH Status | REACH Unaffected |
| Other Names | -2735-LT3081HFE#PBF |
| Standard Package | 95 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
LT3081HFE#PBF Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A
The LT3081HFE#PBF is a 1.5A single-resistor rugged linear regulator from Analog Devices / Linear Technology, housed in a thermally enhanced 16-lead TSSOP package with an exposed pad. It operates from a wide input voltage range of 1.2V to 36V and delivers an adjustable output from 0V to 34.5V set by a single external resistor, eliminating the need for a traditional feedback divider. The device features an extended safe operating area, ultra-low output noise of 27uVRMS, and exceptional regulation performance with less than 1mV load regulation and under 0.001%/V line regulation. Integrated monitoring functions include an output current monitor (IMON = IOUT/5000) and a junction temperature monitor (1uA/degC), while comprehensive protection features such as programmable current limit, reverse-battery protection, reverse-current protection, and thermal shutdown ensure robust operation in harsh environments.
Applications
The LT3081HFE#PBF excels in rugged industrial power supplies where wide input ranges and high reliability are paramount. It serves as an ideal post-regulator for switching converters, cleaning up noisy switching outputs with its low noise and high PSRR. The device is widely used in all-surface-mount power systems, low-output-voltage supplies for modern digital ICs, and intrinsic safety applications where controlled energy limits are required. Its current-source configuration suits precision biasing circuits, while paralleled implementations deliver high-current distributed power with inherent load sharing. Additional applications include cable drop compensation in remote sensing systems, reference voltage buffers, and soft-start voltage rails.
Frequently Asked Questions
Q: What is the key advantage of the LT3081HFE#PBF over conventional adjustable regulators?
A: The LT3081 uses a current-reference architecture with a unity-gain follower, allowing output adjustment down to 0V with a single resistor, direct parallelability without ballast resistors, and constant noise performance regardless of output voltage, unlike traditional regulators where noise increases with output voltage.
Alternative Regulator Models
1. LT3080: A 1.1A version of the same current-reference architecture in smaller packages, offering identical parallelability and low-noise performance for medium-current designs.
2. LT3085: A 500mA compact variant housed in MSOP and 2mm x 3mm DFN packages, ideal for space-constrained portable equipment requiring the same flexible output programming.
3. LT3082: A 200mA low-dropout linear regulator with 40V maximum input, suited for low-current bias supplies and two-terminal current-source applications.
4. LT3092: A 200mA two-terminal programmable current source based on the same architecture, designed specifically for precision constant-current biasing and LED driving.
