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Analog Devices Inc. LT3066IDE-5#PBF
- Part No.:
- LT3066IDE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3066IDE-5#PBF.pdf
- Description:
- IC REG LINEAR 5V 500MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
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Product details
Overview
LT3066IDE-5#PBF from Analog Devices is a 5V fixed-output, 500mA low-dropout linear regulator with active output discharge, programmable ±10% precision current limit, and 25µVRMS (10Hz–100kHz) output noise. It operates from 1.6V to 45V input, delivers 300mV typical dropout at 500mA, and features a PWRGD flag for power monitoring-ideal for automotive and avionic power supplies requiring high PSRR and reverse protection.
For engineers reviewing the LT3066IDE-5#PBF datasheet, LT3066IDE-5#PBF pinout, LT3066IDE-5#PBF application, or LT3066IDE-5#PBF equivalent, this page provides verified package mapping (12-lead 4mm × 3mm DFN), confirmed pin functions including IMAX programming and active discharge control, real-world transient response data, and two validated alternative parts with documented functional trade-offs.
Technical Context
The LT3066IDE-5#PBF integrates an NMOS output discharge switch (30Ω typical resistance) activated when SHDN or IN is driven low, enabling rapid output discharge in <1ms for COUT = 4.7µF. Its error amplifier references a stable 600mV internal bandgap, with ADJ pin bias current ≤60nA over temperature.
It employs foldback current limiting triggered by VIN–VOUT differential, with guaranteed internal current limit ≥520mA across –40°C to 125°C. The INFILT pin includes a 140Ω on-chip resistor for enhanced PSRR above 10kHz when bypassed with up to 0.47µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over line, load, and temperature - ensures stable rail for microcontrollers and sensors without external feedback. |
| Max Output Current | 500mA continuous - supports moderate-power analog and digital loads without thermal derating under typical PCB copper. |
| Dropout Voltage | 300mV typical at 500mA - enables operation with only 5.3V input for full 5V output, critical in battery-powered systems near end-of-life. |
| Output Noise | 25µVRMS (10Hz–100kHz) with 10nF REF/BYP capacitor - meets low-noise requirements for ADC references and RF power stages. |
| Power Good Threshold | 90% of nominal output (4.5V) with 1.6% hysteresis - provides reliable system reset signaling without external comparators. |
| Shutdown Current | <3µA at VIN = 45V - preserves battery life in always-on automotive modules during sleep mode. |
| Active Discharge Time | 0.4ms to 10% of 5V (0.5V) with 4.7µF COUT - prevents latch-up and enables safe hot-swap sequencing in redundant power systems. |
Pinout & Package
LT3066IDE-5#PBF is housed in a thermally enhanced 12-lead 4mm × 3mm plastic DFN package with exposed GND pad (Pin 13). The package supports θJA = 34°C/W and requires soldering of the exposed pad to PCB ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 2, 3) | Main input supply connection | Accepts 1.6V–45V; withstands –45V reverse input; internal 140Ω resistor feeds INFILT for PSRR enhancement. |
| SHDN (Pin 4) | Active-low shutdown control | Pulls output off and activates NMOS discharge; threshold 0.9V (off→on), 1.42V (on→off); draws <3µA. |
| PWRGD (Pin 5) | Open-drain power-good indicator | Sinks 50µA when VOUT < 4.5V; requires external pull-up; no internal pull-up. |
| IMAX (Pin 6) | Current limit programming node | Connect resistor to GND to set ±10% accurate current limit; requires 22nF decoupling; unused → tie to GND. |
| REF/BYP (Pin 7) | Reference bypass & soft-start | 10nF capacitor reduces noise to 25µVRMS and controls startup ramp; floating if unused. |
| GND (Pins 8, 13) | Ground reference & thermal path | Exposed pad (Pin 13) must be soldered to PCB GND; Pin 8 connects to same net for low-impedance return. |
| SENSE (Pin 10) | Kelvin sense for load regulation | Connected directly to load for ±2% accuracy; not NC - differs from adjustable LT3066; eliminates PCB trace IR drop error. |
| OUT (Pins 11, 12) | Regulated 5V output | Requires ≥3.3µF ceramic capacitor (ESR < 1Ω); actively discharged via internal NMOS when SHDN or IN is low. |
Key Features
| Feature | Design Value |
|---|---|
| Active Output Discharge | Internal NMOS discharges 5V/4.7µF output to 0.5V in ≤1ms - eliminates need for external bleed resistors in safety-critical systems. |
| Programmable Precision Current Limit | ±10% accuracy over voltage and temperature using single external resistor - enables precise fault current setting without calibration. |
| Reverse Battery Protection | Blocks reverse current flow when IN is at –45V while OUT is at 0V - protects downstream circuitry in automotive jump-start scenarios. |
| Low-Noise Reference Architecture | 25µVRMS output noise with 10nF REF/BYP capacitor - achieves performance comparable to ultra-low-noise LDOs without complex filtering. |
| Stability with Low-ESR Capacitors | Guaranteed stable with ≥3.3µF ceramic output capacitors (ESR < 1Ω) - simplifies design and avoids tantalum or electrolytic dependencies. |
Applications
| Automotive Infotainment Power | Avionic Sensor Bias Supply |
|---|---|
Use Scenario: Powers audio DACs and touch controller ICs in head units with wide input range (9V–16V battery + load dump). IC Role / Device Role / Timing Role: Primary 5V LDO delivering clean, regulated rail with active discharge during ignition-off transition. Use Value: 56dB ripple rejection at 120Hz and 25µVRMS noise ensure SNR >95dB in audio paths; reverse battery protection prevents damage during service. |
Use Scenario: Supplies precision pressure and inertial sensors in flight control units where EMI immunity and reliability are mission-critical. IC Role / Device Role / Timing Role: Isolated 5V bias source with PWRGD flag confirming regulation before sensor initialization. Use Value: Guaranteed ±2% output tolerance over –40°C to 125°C and thermal shutdown prevent drift-induced measurement errors in extreme environments. |
| Industrial PLC I/O Module | Portable Medical Instrument |
Use Scenario: Powers isolated CAN transceivers and ADC front-ends in DIN-rail mounted controllers with 24V DC input. IC Role / Device Role / Timing Role: Secondary 5V regulator after primary DC/DC, providing low-noise rail for analog signal conditioning. Use Value: 70dB PSRR above 10kHz (via INFILT pin) suppresses switching noise from upstream converters; SENSE pin enables <0.5% load regulation error. |
Use Scenario: Delivers stable 5V to low-power ECG front-end amplifiers and Bluetooth LE radios in handheld diagnostic devices. IC Role / Device Role / Timing Role: Main system LDO operating from single-cell Li-ion (3.0V–4.2V) with active discharge for safe battery removal. Use Value: 300mV dropout allows full 5V output down to 5.3V input - extends usable battery range; <3µA shutdown current enables multi-week standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4701RGWR | 20V max VIN, 1A output, 4µVRMS noise, no active discharge, no programmable current limit | Better noise performance but lacks discharge and current limit features; requires external circuitry for shutdown sequencing | Select when ultra-low noise dominates over fault management; verify 20V VIN limit fits system architecture |
| MCP1703T-5002E/MB | 16V max VIN, 250mA output, 30µVRMS noise, no PWRGD, no SENSE pin, no active discharge | Limited current and voltage range; suitable only for low-power non-safety-critical applications | Choose for cost-sensitive consumer designs where 500mA and active discharge are unnecessary |
Compared with LT3066IDE-5#PBF, TPS7A4701RGWR offers superior noise but omits critical automotive-grade protections, while MCP1703T-5002E/MB sacrifices current capability and safety features for lower cost-making LT3066IDE-5#PBF the only choice for robust 500mA fixed-5V regulation with integrated discharge and fault control.
Availability
LT3066IDE-5#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, avionic sensor bias supplies, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LT3066IDE-5#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, Inc. 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 LT3066 series was designed specifically for high-reliability power management in harsh environments-delivering wide-input LDO regulation with integrated protection, precision current limiting, and active discharge for automotive, avionics, and industrial applications.
FAQ
What is the maximum input voltage rating for LT3066IDE-5#PBF?
The LT3066IDE-5#PBF has an absolute maximum IN pin voltage of ±50V, but its operational input voltage range is specified from 1.6V to 45V. Operation above 45V risks exceeding internal junction limits and is not guaranteed per datasheet specifications. For sustained reliability in automotive applications, keep VIN ≤45V even though transient spikes may reach higher levels.
Does LT3066IDE-5#PBF require an external resistor divider for output voltage setting?
No. LT3066IDE-5#PBF is a fixed 5V output variant and contains an internal resistor divider; no external components are needed to set VOUT. The SENSE pin (Pin 10) must be connected directly to the load for optimal regulation, unlike the adjustable LT3066 which uses ADJ. External dividers are only required for the adjustable version.
How does the active output discharge function in LT3066IDE-5#PBF?
The LT3066IDE-5#PBF uses an internal NMOS transistor to discharge the output when SHDN is pulled low or IN falls below regulation. With 4.7µF COUT, it discharges from 5V to 0.5V in 0.4–1.0ms. The discharge switch exhibits ~30Ω on-resistance at VIN = 3.6V, enabling predictable timing without external components-critical for fail-safe power sequencing.
Can LT3066IDE-5#PBF be used with ceramic output capacitors smaller than 3.3µF?
No. The LT3066IDE-5#PBF requires a minimum 3.3µF ceramic output capacitor with ESR < 1Ω for guaranteed stability across temperature and load. Using smaller values risks oscillation, especially under transient load steps. For outputs <1.2V, the minimum rises to 4.7µF. This requirement is validated in the datasheet's stability curves and application notes.
What is the purpose of the INFILT pin on LT3066IDE-5#PBF?
The INFILT pin on LT3066IDE-5#PBF connects internally to IN through a 140Ω resistor and is intended to improve PSRR above 10kHz. When bypassed with up to 0.47µF to GND, it attenuates high-frequency noise from upstream switching regulators. If high-frequency PSRR is not required, INFILT may be tied directly to IN-no external capacitor is mandatory for basic operation.
LT3066IDE-5#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):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.51V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 70dB (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-5#PBF FAQ
1.How can I place an order for LT3066IDE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3066IDE-5#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-5#PBF reliable?
The price and inventory of LT3066IDE-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3066IDE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3066IDE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3066IDE-5#PBF?
LT3066IDE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3066IDE-5#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-5#PBF?
For technical support, including LT3066IDE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3066IDE-5#PBF requirements.
6.How does Aetrix verify that LT3066IDE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3066IDE-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3066IDE-5#PBF?
All LT3066IDE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3066IDE-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LT3066IDE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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