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Analog Devices Inc. LT3065HDD-1.2#PBF
- Part No.:
- LT3065HDD-1.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3065HDD-1.2#PBF.pdf
- Description:
- IC REG LINEAR 1.2V 500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,389
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Product details
Overview
LT3065HDD-1.2#PBF from Analog Devices is a 45V input, 500mA low-noise LDO linear regulator with fixed 1.2V output, programmable current limit, and power-good flag. It delivers ±2% output tolerance over line/load/temperature, 25µVRMS noise (10Hz–100kHz), and operates from –40°C to 150°C in automotive-grade thermal-enhanced DFN. Used in avionic power supplies requiring stable low-noise bias for precision ADCs and sensors.
For engineers reviewing the LT3065HDD-1.2#PBF datasheet, LT3065HDD-1.2#PBF pinout, LT3065HDD-1.2#PBF application, or LT3065HDD-1.2#PBF equivalent, key selection criteria include its 150°C junction-rated DFN package, ±10% programmable current limit accuracy, reverse battery protection, and compatibility with ≥3.3µF ceramic output capacitors without external compensation.
Technical Context
The LT3065HDD-1.2#PBF integrates a precision bandgap reference, error amplifier, and PMOS pass transistor optimized for low dropout (300mV at 500mA) and ultra-low noise. Its internal current limit folds back under short-circuit conditions, and the PWRGD flag asserts when output reaches 86–94% of nominal voltage with 1.6% hysteresis.
It uses a dedicated SENSE pin (Pin 8) and ADJ pin (Pin 7) configured as GND for fixed-output variants-enabling accurate current limit programming via IMAX-to-GND resistor while maintaining tight output regulation independent of load or input variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±2% over line, load, and temperature - ensures stable core voltage for low-voltage microcontrollers and FPGAs. |
| Max Input Voltage | 45V - supports wide-range industrial and automotive battery inputs including 24V and 42V systems. |
| Output Current | 500mA - sufficient for powering multiple analog signal chains or digital subsystems from a single rail. |
| Noise (10Hz–100kHz) | 25µVRMS with 10nF REF/BYP capacitor - enables clean supply for high-resolution SAR ADCs and RF front-ends. |
| Dropout Voltage | 300mV at 500mA - allows operation with minimal headroom, e.g., 1.5V input for 1.2V output in energy-constrained designs. |
| Operating Temp | –40°C to +150°C (H-grade) - qualified per AEC-Q100 for under-hood automotive and avionic applications. |
| Power Good Flag | PWRGD asserts at 86–94% VOUT with 1.6% hysteresis - provides reliable system reset and sequencing control without external monitoring. |
Pinout & Package
LT3065HDD-1.2#PBF uses a thermally enhanced 10-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 11) soldered to PCB for optimal thermal performance (θJC = 9°C/W). The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 2) | Input supply connection | Dual-pin configuration reduces trace inductance and improves high-frequency PSRR; requires local 1µF ceramic bypass. |
| SHDN (Pin 3) | Enable/disable control | Active-low logic input; <1µA shutdown quiescent current enables ultra-low-power standby modes. |
| PWRGD (Pin 4) | Power-good status output | Open-drain flag pulled high externally; signals valid regulation to MCU or sequencer for safe startup. |
| IMAX (Pin 5) | Current limit programming | Connects to GND via resistor to set precision ±10% current limit (e.g., 1.5kΩ → ~200mA); unused must tie to GND. |
| GND (Pin 6) | Ground reference | Signal ground return path; tied internally to exposed pad (Pin 11) - must be solidly connected to PCB thermal plane. |
| ADJ (Pin 7) | Adjust reference node | Configured as GND for fixed-output variants - enables internal feedback network for 1.2V regulation without external resistors. |
| SENSE (Pin 8) | Output voltage sensing | High-impedance sense input for remote sensing; improves load regulation in high-current PCB layouts with trace resistance. |
| REF/BYP (Pin 9) | Noise reduction & soft-start | Accepts 10nF capacitor to reduce reference noise by 2× and control output ramp rate during startup. |
| OUT (Pins 10) | Regulated output | Delivers 1.2V at up to 500mA; stable with ≥3.3µF ceramic output capacitor - no ESR requirement. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current limit | ±10% accuracy over temperature and input voltage range - enables precise fault current setting for system-level fuseless protection. |
| Reverse battery protection | Withstands –45V on IN pin with <300µA leakage - eliminates need for external series diode in automotive battery-reversal scenarios. |
| Low ESR capacitor stability | Stable with 3.3µF minimum ceramic output capacitor - reduces BOM count and board space vs. tantalum or electrolytic solutions. |
| Shutdown quiescent current | <1µA at VIN = 45V - extends battery life in always-on vehicle modules and portable instrumentation. |
| Thermal grade H | 100% tested at TJ = 150°C - guarantees operation in engine-control units, radar modules, and other high-ambient environments. |
Applications
| Avionic Power Supply | Automotive Engine Control Unit |
|---|---|
Use Scenario: Providing clean 1.2V bias to high-speed ADCs and FPGA I/O banks in flight data recorders. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated core voltage with precise sequencing via PWRGD flag. Use Value: 25µVRMS noise and ±2% tolerance ensure <1 LSB error in 16-bit ADC conversions across –55°C to +125°C operating range. | Use Scenario: Powering microcontroller cores and CAN transceivers in under-hood ECU modules. IC Role / Device Role / Timing Role: Main 1.2V supply with reverse battery and thermal protection, enabling direct battery connection without external diodes. Use Value: –40°C to +150°C operation and 45V max input support cold-cranking and load-dump transients per ISO 7637-2. |
| Industrial PLC I/O Module | Portable Medical Sensor Hub |
Use Scenario: Generating isolated 1.2V rails for analog front-end amplifiers and precision DACs in modular I/O cards. IC Role / Device Role / Timing Role: Low-noise post-regulator after isolated DC/DC converter, with SENSE pin enabling remote sensing over long PCB traces. Use Value: 300mV dropout and 500mA output allow efficient conversion from 3.3V intermediate bus, minimizing heat dissipation in confined enclosures. | Use Scenario: Supplying ultra-low-noise 1.2V to wearable biosensor ASICs and low-power Bluetooth SoCs. IC Role / Device Role / Timing Role: Primary LDO with REF/BYP capacitor optimization for sub-µV noise performance in battery-powered diagnostics. Use Value: 25µVRMS noise and <1µA shutdown current extend battery runtime while maintaining clinical-grade signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3066HDD-1.2#PBF | Includes integrated soft-start capacitor and higher PSRR (85dB @ 120Hz); same pinout and specs otherwise. | Better suited for noise-sensitive RF power stages where ripple rejection >80dB is required. | Select LT3066HDD-1.2#PBF if PSRR >80dB at 120Hz is mandatory and soft-start timing must be factory-set. |
| TPS7A4701RGWR | 20V max input, 1A output, 4µVRMS noise; different pinout, no PWRGD or IMAX pins. | Targeted at lower-voltage, higher-current lab equipment and test instruments with tighter noise budgets. | Choose TPS7A4701RGWR only when input voltage ≤20V and ultra-low noise (<5µVRMS) outweighs need for automotive temp grade and fault reporting. |
Compared with LT3065HDD-1.2#PBF, LT3066HDD-1.2#PBF adds factory-tuned soft-start and higher PSRR but shares identical thermal rating and current limit architecture; TPS7A4701RGWR trades automotive qualification and programmability for lower noise and higher output current at reduced input voltage range.
Availability
LT3065HDD-1.2#PBF is available at Aetrix Electronics and suitable for avionic power supplies, automotive engine control units, and industrial PLC I/O modules requiring stable component supply with guaranteed AEC-Q100 compliance and extended temperature operation.
Supply support for LT3065HDD-1.2#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.
The LT3065 Series was designed specifically for high-reliability, wide-input-voltage LDO applications demanding low noise, robust protection, and extended temperature operation - especially in automotive and aerospace systems.
FAQ
What is the maximum input voltage rating for LT3065HDD-1.2#PBF?
The LT3065HDD-1.2#PBF has an absolute maximum input voltage of ±50V on the IN pin, with a recommended operating range up to 45V. This allows direct connection to 24V and 42V automotive battery systems, including cold-crank and load-dump transients compliant with ISO 7637-2. Exceeding 45V may trigger internal protection or degrade reliability.
Does LT3065HDD-1.2#PBF require an external feedback resistor network?
No, LT3065HDD-1.2#PBF does not require external feedback resistors because it is a fixed-output variant. Its internal feedback network is trimmed to deliver 1.2V ±2%, with Pin 7 (ADJ) internally connected to GND and Pin 8 (SENSE) used for remote sensing. External resistors are only needed for current limit programming via the IMAX pin.
How is the power-good flag (PWRGD) of LT3065HDD-1.2#PBF configured and used?
The PWRGD pin of LT3065HDD-1.2#PBF is an open-drain output that pulls low when the output voltage falls below 86–94% of nominal (1.2V), with 1.6% hysteresis. It requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V) and interfaces directly with MCU reset inputs or power sequencers to confirm stable regulation before system initialization.
Can LT3065HDD-1.2#PBF operate with ceramic output capacitors smaller than 10µF?
Yes, LT3065HDD-1.2#PBF is stable with ceramic output capacitors as small as 3.3µF - significantly lower than legacy LDOs requiring 22µF or more. This enables compact, low-ESR designs without compromising transient response or loop stability, and eliminates the need for tantalum or aluminum electrolytic capacitors.
What thermal performance can be expected from LT3065HDD-1.2#PBF in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 1-in² 2oz copper thermal pad connected to Pin 11 (exposed GND pad), LT3065HDD-1.2#PBF achieves θJA ≈ 31°C/W and θJC = 9°C/W. At 500mA and 300mV dropout (150mW dissipation), junction temperature rise is ~4.7°C above ambient - well within its 150°C max rating even at 125°C ambient, enabling full-load operation in sealed enclosures.
LT3065HDD-1.2#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):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.51V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 110 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 78dB (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-1.2#PBF FAQ
1.How can I place an order for LT3065HDD-1.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3065HDD-1.2#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-1.2#PBF reliable?
The price and inventory of LT3065HDD-1.2#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-1.2#PBF is usually 5 days.
3.What payment methods are accepted for LT3065HDD-1.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3065HDD-1.2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3065HDD-1.2#PBF?
LT3065HDD-1.2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3065HDD-1.2#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-1.2#PBF?
For technical support, including LT3065HDD-1.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3065HDD-1.2#PBF requirements.
6.How does Aetrix verify that LT3065HDD-1.2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3065HDD-1.2#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-1.2#PBF meets industry standards.
7.What is the process for return or replacement of LT3065HDD-1.2#PBF?
All LT3065HDD-1.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3065HDD-1.2#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-1.2#PBF part is unused and in its original packaging.
Return procedure for LT3065HDD-1.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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