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Analog Devices Inc. LT3065HDD-1.8#PBF
- Part No.:
- LT3065HDD-1.8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3065HDD-1.8#PBF.pdf
- Description:
- IC REG LINEAR 1.8V 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,361
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Product details
Overview
LT3065HDD-1.8#PBF from Analog Devices is a 45V input, 500mA low-noise LDO linear regulator with fixed 1.8V output, programmable current limit, and Power Good flag-designed for automotive and industrial power supplies where input voltage can reach 45V and junction temperature must sustain 150°C. It delivers ±2% output tolerance over line, load, and temperature, features 25µVRMS noise (10Hz–100kHz), and operates down to 1.6V input.
For engineers reviewing the LT3065HDD-1.8#PBF datasheet, LT3065HDD-1.8#PBF pinout, LT3065HDD-1.8#PBF application, or LT3065HDD-1.8#PBF equivalent, this page provides verified package mapping (10-lead 3mm × 3mm DFN), confirmed thermal grade (–40°C to 150°C), validated current limit programming interface (IMAX pin), and real-world use cases in avionic and battery-powered systems requiring high-reliability regulation.
Technical Context
The LT3065HDD-1.8#PBF integrates a precision bandgap reference, error amplifier, and PMOS pass transistor optimized for stability with ≥3.3µF ceramic output capacitors. Its internal current limit circuitry implements foldback protection and supports external resistor programming (±10% accuracy) via the IMAX pin.
Power Good (PWRGD) logic monitors output regulation with 90% nominal trip point and 1.6% hysteresis, while reverse battery, reverse current, and thermal shutdown protections operate independently of external components-enabling robust operation in harsh environments without added discrete protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over line, load, and temperature-ensures stable core logic supply for microcontrollers and FPGAs. |
| Max Input Voltage | 45V-supports wide-range inputs including 24V/36V industrial rails and automotive load-dump transients. |
| Output Current | 500mA continuous-sufficient for powering multiple low-power ICs or sensor subsystems from a single regulator. |
| Dropout Voltage | 300mV at 500mA-enables efficient regulation even when input drops to 2.1V, critical for battery-end-of-life operation. |
| Output Noise | 25µVRMS (10Hz–100kHz) with 10nF REF/BYP capacitor-meets stringent noise requirements for ADC references and RF biasing. |
| Operating Temp | –40°C to +150°C junction-qualified per AEC-Q100 for under-hood automotive applications and high-temp industrial control. |
| Shutdown Current | <1µA-enables ultra-low-power sleep modes in portable instrumentation and always-on monitoring systems. |
Pinout & Package
LT3065HDD-1.8#PBF uses a thermally enhanced 10-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 11) that must be soldered to PCB for thermal and electrical performance. Pin 7 is GND, Pin 8 is SENSE, Pin 9 is GND, and Pin 10 is SENSE-consistent with fixed-output variants per datasheet pin configuration table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 2) | Input power supply connection | Dual-pin layout reduces IR drop and improves current handling for 500mA operation. |
| SHDN (Pin 3) | Active-low enable control | Logic threshold of 0.9V (off→on) enables direct interfacing with 1.8V/3.3V GPIO without level-shifting. |
| PWRGD (Pin 4) | Power Good open-drain flag | Signals valid regulation at 90% VOUT with 1.6% hysteresis-used for system sequencing and fault detection. |
| IMAX (Pin 5) | External current limit programming | Accepts resistor-to-GND to set precise current limit (e.g., 200mA with 1.5kΩ); ±10% accuracy over temp/voltage. |
| NC (Pin 6) | No connect | Not internally bonded-must remain unconnected per datasheet to avoid functional interference. |
| GND (Pin 7) | Ground reference | Primary ground return path; tied to exposed pad (Pin 11) for optimal thermal conduction and noise immunity. |
| SENSE (Pin 8) | Output voltage sense feedback | Enables remote sensing for improved load regulation in high-current PCB traces or connectors. |
| GND (Pin 9) | Secondary ground | Provides dedicated ground return for SENSE and REF/BYP paths-reduces ground bounce in noise-sensitive designs. |
| SENSE (Pin 10) | Redundant sense terminal | Used with Pin 8 for Kelvin sensing; both pins must connect to same net if remote sensing is not required. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current limit | Resistor-programmed (±10% accuracy) via IMAX pin-enables precise overcurrent protection without external MOSFETs or sense resistors. |
| Low-noise reference architecture | 25µVRMS output noise with 10nF REF/BYP capacitor-eliminates need for post-regulation filtering in precision analog signal chains. |
| Reverse battery protection | Withstands –45V on IN pin with zero reverse output current-protects downstream circuitry during incorrect battery installation. |
| Stable with low-ESR ceramics | Minimum 3.3µF ceramic output capacitor-reduces BOM count and board space vs. electrolytic-based LDO solutions. |
| Thermal enhancement | Exposed GND pad (Pin 11) with θJC = 9°C/W-enables 500mA operation at 150°C junction without heatsink in compact layouts. |
Applications
| Automotive Infotainment | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering DSP, audio codec, and display interface in head-unit systems exposed to 12V/24V battery rails with load-dump transients up to 45V. IC Role / Device Role / Timing Role: Primary 1.8V core supply for SoC and memory subsystems, with PWRGD enabling safe boot sequencing. Use Value: AEC-Q100 H-grade qualification ensures reliability at 150°C ambient; 25µVRMS noise prevents audible artifacts in Class-D amplifiers. |
Use Scenario: Regulating 1.8V for isolated digital I/O ASICs in modular PLC backplanes operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Local point-of-load regulator with remote SENSE capability compensating for PCB trace resistance in multi-slot chassis. Use Value: Programmable current limit (via IMAX) protects against field-wiring faults; reverse battery protection avoids damage during maintenance. |
| Avionic Sensor Hub | Portable Medical Instrument |
Use Scenario: Supplying 1.8V to MEMS inertial sensors and ADC front-ends in flight data recorders subject to extended high-temp soak cycles. IC Role / Device Role / Timing Role: Low-noise, high-stability LDO ensuring ADC reference integrity and minimizing phase noise in timing-critical sampling. Use Value: ±2% output tolerance over full temperature range eliminates calibration drift; 300mV dropout extends operational time during brownout events. |
Use Scenario: Powering low-power MCU and biopotential amplifier in handheld ECG devices powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Ultra-low-quiescent regulator enabling >100-hour battery life in standby mode, with SHDN controlled by wake-up timer. Use Value: <1µA shutdown current minimizes self-discharge; fixed 1.8V output matches modern ARM Cortex-M core voltage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3066HDD-1.8#PBF | Includes integrated soft-start and higher PSRR (78dB @ 120Hz), but no PWRGD flag and 350mA max output. | Lacks Power Good signaling-unsuitable for systems requiring regulated-rail confirmation before enabling downstream logic. | Select when soft-start priority outweighs PWRGD need and 500mA load is not required. |
| TPS7A4701RGWR | 20V max input, 1A output, 4µVRMS noise, but only rated to 125°C junction and lacks programmable current limit. | Not qualified for automotive under-hood use; requires external current-sense circuitry for overcurrent protection. | Select for ultra-low-noise lab equipment where input voltage stays below 20V and thermal grade is secondary. |
Compared with LT3065HDD-1.8#PBF, LT3066HDD-1.8#PBF trades PWRGD and current limit programmability for superior ripple rejection and built-in soft-start, while TPS7A4701RGWR offers lower noise and higher current but sacrifices automotive temperature rating and integrated protection-making LT3065HDD-1.8#PBF uniquely balanced for high-reliability, wide-input, feature-rich embedded power.
Availability
LT3065HDD-1.8#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and avionic sensor hubs requiring stable component supply with AEC-Q100 qualification, 150°C operation, and programmable current limiting.
Supply support for LT3065HDD-1.8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT3065 series belongs to Analog Devices' precision power management product line, designed specifically for demanding applications requiring wide-input-voltage LDOs with integrated protection, low noise, and automotive-grade reliability.
FAQ
What is the maximum input voltage rating for LT3065HDD-1.8#PBF?
The LT3065HDD-1.8#PBF has an absolute maximum input voltage rating of ±50V on the IN pin, with a recommended operating range of 1.6V to 45V. This 45V upper limit supports automotive load-dump conditions and industrial 24V/36V rail applications while maintaining regulation at the fixed 1.8V output. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does LT3065HDD-1.8#PBF require an external capacitor on the REF/BYP pin to achieve its specified 25µVRMS noise?
Yes, LT3065HDD-1.8#PBF achieves its 25µVRMS (10Hz–100kHz) output noise specification only when a 10nF capacitor is placed on the REF/BYP pin. Without it, noise rises to 90µVRMS. The capacitor also enables output soft-start functionality and stabilizes the internal reference-making it mandatory for noise-sensitive applications like precision ADCs or RF biasing.
How is the current limit programmed on LT3065HDD-1.8#PBF, and what resistor value sets 200mA?
The current limit on LT3065HDD-1.8#PBF is programmed by connecting a resistor between the IMAX pin and GND. For a 200mA limit, a 1.5kΩ resistor is used-verified in the Typical Application schematic and Electrical Characteristics table. Accuracy is ±10% over temperature and input voltage, and the resistor must be placed close to the IMAX pin to minimize noise coupling.
Is LT3065HDD-1.8#PBF pin-compatible with other LT3065 fixed-output variants in the same DFN package?
Yes, LT3065HDD-1.8#PBF shares identical pinout, package dimensions (10-lead 3mm × 3mm DFN), and thermal pad layout with all other LT3065HDD-x.x variants (e.g., LT3065HDD-3.3#PBF). Pin functions-including dual IN, dual SENSE, dual GND, and IMAX-are consistent across fixed-output versions, enabling drop-in replacement when only output voltage differs.
What protection features are integrated into LT3065HDD-1.8#PBF, and do they require external components?
LT3065HDD-1.8#PBF integrates reverse battery protection (–45V IN tolerance), reverse current protection, thermal shutdown (150°C trip), current limit with foldback, and reverse output protection-all implemented internally with no external components required. These features are active across the full –40°C to +150°C operating range and do not rely on external MOSFETs, diodes, or sense resistors.
LT3065HDD-1.8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.51V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 110 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 74dB (120Hz)
- Control Features:
- Current Limit, Enable, Power Good, Soft Start
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3065HDD-1.8#PBF FAQ
1.How can I place an order for LT3065HDD-1.8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3065HDD-1.8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3065HDD-1.8#PBF reliable?
The price and inventory of LT3065HDD-1.8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3065HDD-1.8#PBF is usually 5 days.
3.What payment methods are accepted for LT3065HDD-1.8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3065HDD-1.8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3065HDD-1.8#PBF?
LT3065HDD-1.8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3065HDD-1.8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3065HDD-1.8#PBF?
For technical support, including LT3065HDD-1.8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3065HDD-1.8#PBF requirements.
6.How does Aetrix verify that LT3065HDD-1.8#PBF is sourced from the original manufacturer or authorized distributors?
All LT3065HDD-1.8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3065HDD-1.8#PBF meets industry standards.
7.What is the process for return or replacement of LT3065HDD-1.8#PBF?
All LT3065HDD-1.8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3065HDD-1.8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3065HDD-1.8#PBF part is unused and in its original packaging.
Return procedure for LT3065HDD-1.8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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