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Analog Devices Inc. LT3066IDE-3.3#PBF
- Part No.:
- LT3066IDE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3066IDE-3.3#PBF.pdf
- Description:
- IC REG LINEAR 3.3V 500MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
LT3066IDE-3.3#PBF from Analog Devices is a 45V input, 500mA low-noise LDO linear regulator with fixed 3.3V output, active output discharge, programmable ±10% precision current limit, and Power Good flag. It delivers stable power in battery-powered, automotive, and avionic systems where low dropout (300mV at 500mA), 25µVRMS noise (10Hz–100kHz), and reverse protection are critical.
For engineers reviewing the LT3066IDE-3.3#PBF datasheet, LT3066IDE-3.3#PBF pinout, LT3066IDE-3.3#PBF application, or LT3066IDE-3.3#PBF equivalent, key selection criteria include its 12-lead DFN package with SENSE pin for Kelvin sensing, guaranteed ±2% output tolerance over line/load/temperature, shutdown current <3µA, and compatibility with low-ESR ceramic capacitors ≥3.3µF.
Technical Context
The LT3066IDE-3.3#PBF integrates an NMOS output discharge switch controlled by SHDN or IN low conditions, enabling rapid output discharge to <10% nominal in ≤1ms with 4.7µF COUT. Its error amplifier references a 600mV internal bandgap, with SENSE pin (Pin 10) directly monitoring load voltage to eliminate PCB trace IR drop errors.
Current limiting uses an external resistor on IMAX (Pin 6) tied to GND, with mirror ratio 1:500 enabling ±10% accuracy across temperature and input voltage. The PWRGD open-drain flag asserts low when VOUT falls below 90% of nominal, with 1.6% hysteresis, and requires an external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V, ±2% tolerance over line, load, and –40°C to 125°C ensures reliable logic supply in harsh environments. |
| Max Input Voltage | 45V absolute maximum enables direct connection to 24V industrial or 36V automotive batteries without pre-regulation. |
| Dropout Voltage | 300mV typical at 500mA allows operation down to VIN = 3.6V while maintaining regulation - critical for battery end-of-life. |
| Output Noise | 25µVRMS (10Hz–100kHz) with 10nF REF/BYP capacitor supports sensitive analog/RF circuitry without additional filtering. |
| Active Discharge | Internal NMOS discharges output to ≤10% VOUT in ≤1ms (COUT = 4.7µF), preventing back-powering or latch-up in multi-rail systems. |
| Power Good Flag | PWRGD open-drain output asserts low when VOUT drops below 90% nominal, enabling sequenced power-up with hysteresis for noise immunity. |
| Shutdown Current | <3µA at VIN = 45V minimizes battery drain during system sleep - essential for portable instrumentation. |
Pinout & Package
LT3066IDE-3.3#PBF is housed in a thermally enhanced 12-lead 4mm × 3mm plastic DFN package with exposed GND pad (Pin 13). Pin 10 functions as SENSE for Kelvin feedback, not NC, distinguishing it from the adjustable version.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INFILT (1) | Filtered Input | Connects via 140Ω internal resistor to IN; adding ≤0.47µF to GND improves PSRR >10kHz - critical for noisy DC-DC outputs. |
| IN (2,3) | Main Input Supply | Dual pins reduce resistance/inductance; withstands –45V reverse input, blocking reverse current to protect upstream sources. |
| SHDN (4) | Shutdown Control | Active-low input; pulls OUT low and enables NMOS discharge; threshold 0.9–1.42V ensures robust TTL/CMOS compatibility. |
| PWRGD (5) | Power Good Indicator | Open-drain output sinking 50µA; requires external pull-up; signals valid regulation with 90% trip point and 1.6% hysteresis. |
| IMAX (6) | Current Limit Programming | Accepts resistor to GND to set precise current limit (e.g., 604Ω = 497mA); 22nF decoupling required to prevent oscillation. |
| REF/BYP (7) | Reference Bypass/Soft-Start | 10nF to GND reduces output noise to 25µVRMS and controls soft-start time - eliminates inrush-induced system resets. |
| GND (8,13) | Ground Reference | Exposed pad (Pin 13) must be soldered to PCB GND plane for thermal dissipation (θJC = 5°C/W) and electrical stability. |
| SENSE (10) | Kelvin Sense Input | Direct connection to load terminal compensates for PCB trace resistance, ensuring ±2% regulation even at 500mA load current. |
| OUT (11,12) | Regulated Output | Dual pins lower impedance; requires ≥3.3µF ceramic capacitor (ESR <1Ω) for stability - avoids costly tantalum or polymer alternatives. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Precision Current Limit | Set via single resistor on IMAX pin with ±10% accuracy across –40°C to 125°C and wide VIN range - replaces discrete current-sense ICs. |
| Active Output Discharge | Internal NMOS discharges output to ~800mV when IN or SHDN goes low - prevents back-feeding into powered-down subsystems. |
| Reverse Battery Protection | Blocks reverse current flow when IN is negative relative to GND/OUT - eliminates need for external series diode and its 0.3V drop. |
| Low-Noise Reference Architecture | Single 10nF capacitor on REF/BYP achieves 25µVRMS noise (10Hz–100kHz), matching performance of ultra-low-noise regulators without complex filtering. |
| Stability with Low-ESR Capacitors | Guaranteed stable with ≥3.3µF ceramic output caps (ESR <1Ω) - avoids instability risks common with polymer/tantalum alternatives. |
Applications
| Battery-Powered Instruments | Automotive Infotainment |
|---|---|
|
Use Scenario: Portable multimeter or handheld oscilloscope powered by two Li-ion cells (6.4–8.4V). IC Role / Device Role / Timing Role: Primary 3.3V rail regulator delivering clean, low-noise power to ADC, microcontroller, and display driver. Use Value: 25µVRMS noise ensures sub-LSB ADC accuracy; active discharge prevents residual voltage from interfering with auto-shutdown sequencing. |
Use Scenario: Head unit supplying 3.3V to SoC, CAN transceiver, and audio codec in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Post-regulator after buck converter, providing EMI-robust, reverse-polarity-protected 3.3V supply. Use Value: Withstands –45V reverse battery connection and 45V load dump transients; 45V max VIN eliminates need for external TVS clamping. |
| Avionic Power Management | Industrial PLC I/O Modules |
|
Use Scenario: Flight data recorder requiring certified power integrity across –55°C to +85°C operating range. IC Role / Device Role / Timing Role: Regulator for FPGA configuration and sensor interface circuitry, with PWRGD enabling health monitoring. Use Value: Guaranteed ±2% output tolerance and 90% PWRGD trip point ensure deterministic reset behavior under voltage sag during engine start. |
Use Scenario: DIN-rail mounted PLC module converting 24V DC to isolated 3.3V for digital I/O logic and communication interfaces. IC Role / Device Role / Timing Role: Local point-of-load regulator with SENSE pin compensating for long PCB traces between power entry and I/O banks. Use Value: Kelvin SENSE connection maintains ±2% regulation despite 50mΩ trace resistance at 500mA, eliminating field calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4701RGWR | Lower noise (4.7µVRMS), but no active discharge, no SENSE pin, and only 20V max VIN. | Suitable for ultra-low-noise analog rails where discharge and high-VIN capability are unnecessary. | Select when noise is paramount and input voltage stays below 20V; avoid for automotive or battery-end-of-life use cases. |
| MCP1826T-3302E/DB | Fixed 3.3V, 500mA, but lacks PWRGD, SENSE, programmable current limit, and reverse battery protection. | Cost-sensitive industrial control where basic regulation suffices and fault detection is handled externally. | Choose for simple, low-cost 3.3V rails with benign input conditions; not suitable for safety-critical or high-reliability systems. |
Compared with TPS7A4701RGWR and MCP1826T-3302E/DB, the LT3066IDE-3.3#PBF uniquely combines 45V operation, Kelvin SENSE, active discharge, and ±10% programmable current limiting - making it the only option for ruggedized 3.3V regulation in automotive, avionics, and battery-powered test equipment.
Availability
LT3066IDE-3.3#PBF is available at Aetrix Electronics and suitable for battery-powered instruments, automotive infotainment systems, and avionic power management requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT3066IDE-3.3#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 precision instrumentation, communications, and industrial markets since 1965.
The LT3066 series was designed for high-reliability power regulation in harsh environments - delivering low noise, wide input range, and integrated protection features for automotive, avionic, and portable instrumentation applications.
FAQ
What is the minimum input voltage required for LT3066IDE-3.3#PBF to regulate at full 500mA load?
The LT3066IDE-3.3#PBF requires a minimum input voltage of 3.6V to maintain 3.3V output at 500mA, based on its 300mV typical dropout voltage. At lower loads, dropout decreases - e.g., 150mV at 50mA - allowing operation down to 3.45V. This ensures functionality even as lithium-based batteries discharge to end-of-life voltages.
How does the SENSE pin on LT3066IDE-3.3#PBF improve load regulation compared to standard LDOs?
The SENSE pin on LT3066IDE-3.3#PBF connects directly to the load terminal, enabling Kelvin sensing that compensates for voltage drop across PCB traces. This eliminates load regulation errors caused by trace resistance - for example, a 50mΩ path carrying 500mA would introduce 25mV error without SENSE, degrading the ±2% spec. With SENSE, regulation remains accurate at the point of load.
Can LT3066IDE-3.3#PBF be used without the REF/BYP capacitor, and what is the impact on noise performance?
Yes, the REF/BYP pin on LT3066IDE-3.3#PBF may be left floating if low noise or soft-start is not required. However, omitting the 10nF capacitor increases RMS output noise from 25µVRMS to 90µVRMS (10Hz–100kHz), which may degrade ADC resolution or RF receiver sensitivity. The capacitor also controls soft-start time, preventing inrush-related system resets.
What is the purpose of the INFILT pin on LT3066IDE-3.3#PBF, and when should a capacitor be added?
The INFILT pin on LT3066IDE-3.3#PBF connects to IN through a 140Ω internal resistor and is intended to improve PSRR above 10kHz. Adding up to 0.47µF from INFILT to GND attenuates high-frequency ripple from switching regulators - for example, reducing 1MHz switching noise by up to 20dB. If powering from a low-noise source like a battery, connect INFILT directly to IN.
Does LT3066IDE-3.3#PBF require an external pull-up resistor on the PWRGD pin, and what value is recommended?
Yes, LT3066IDE-3.3#PBF's PWRGD pin is open-drain and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3V or 5V). A 10kΩ resistor is commonly used, providing sufficient current (330µA at 3.3V) to drive standard logic inputs while keeping power consumption low. The pin sinks up to 50µA when asserted low.
LT3066IDE-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.51V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 71dB (120Hz)
- Control Features:
- Current Limit, Enable, Power Good, Soft Start
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LT3066IDE-3.3#PBF FAQ
1.How can I place an order for LT3066IDE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3066IDE-3.3#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 LT3066IDE-3.3#PBF reliable?
The price and inventory of LT3066IDE-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3066IDE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT3066IDE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3066IDE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3066IDE-3.3#PBF?
LT3066IDE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3066IDE-3.3#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 LT3066IDE-3.3#PBF?
For technical support, including LT3066IDE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3066IDE-3.3#PBF requirements.
6.How does Aetrix verify that LT3066IDE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT3066IDE-3.3#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 LT3066IDE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT3066IDE-3.3#PBF?
All LT3066IDE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3066IDE-3.3#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 LT3066IDE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT3066IDE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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