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Analog Devices Inc. LT3055IDE-3.3#PBF
- Part No.:
- LT3055IDE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT3055IDE-3.3#PBF.pdf
- Description:
- IC REG LINEAR 3.3V 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
LT3055IDE-3.3#PBF from Analog Devices is a 500mA, low-noise, low-dropout linear regulator with fixed 3.3V output, ±45V input rating, precision programmable current limit (±10%), and integrated diagnostics including dual FAULT pins, PWRGD, TEMP, and IMON current monitor (1/500× IOUT). It delivers stable power for noise-sensitive RF/DSP supplies in automotive telematics and industrial truck systems.
For engineers reviewing the LT3055IDE-3.3#PBF datasheet, LT3055IDE-3.3#PBF pinout, LT3055IDE-3.3#PBF application, or LT3055IDE-3.3#PBF equivalent, key selection criteria include its 350mV dropout at 500mA, 25μVRMS output noise (10Hz–100kHz), 10mV/°C temperature monitoring, ±2% output tolerance over load/line/temperature, and compatibility with ≥3.3μF ceramic output capacitors.
Technical Context
The LT3055IDE-3.3#PBF integrates a precision current-limit circuit controlled by an external resistor on the IMAX pin, enabling accurate ±10% current limiting across –40°C to 125°C. Its diagnostic architecture uses open-collector FAULT1 (minimum IOUT fault) and FAULT2 (current/thermal fault) pins, plus PWRGD (90% VOUT trip point with 1% hysteresis) and TEMP (250mV @ 25°C, 10mV/°C).
It employs a micropower reference with soft-start via 10nF REF/BYP capacitor, reduces output noise to 25μVRMS using that bypass cap, and maintains stability with low-ESR ceramic capacitors as small as 3.3μF. Reverse battery, reverse current, and reverse output protection are implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V, ±2% tolerance over full load (1–500mA), line (3.9–45V), and temperature (–40°C to 125°C) range |
| Max Output Current | 500mA continuous; limited by internal foldback and external IMAX resistor programming |
| Dropout Voltage | 350mV at 500mA load, enabling operation with VIN as low as 3.65V while maintaining regulation |
| Output Noise | 25μVRMS (10Hz–100kHz) with 10nF REF/BYP capacitor-critical for RF and precision analog supply rails |
| Current Monitor Ratio | IMON outputs exactly 1/500th of IOUT (e.g., 1mA IMON = 500mA IOUT), enabling accurate real-time load monitoring |
| Temperature Sensing | TEMP pin provides 10mV/°C linear output (250mV at 25°C), usable for die temperature estimation and thermal management |
| Shutdown Current | <1μA when SHDN pulled low, supporting ultra-low-power system sleep modes |
| Input Voltage Range | 1.6V to 45V, with ±45V absolute maximum rating-suited for harsh automotive and industrial environments |
Pinout & Package
LT3055IDE-3.3#PBF is housed in a 16-lead (4mm × 3mm) plastic DFN package with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. θJA = 38°C/W, θJC = 4.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 2) | Power Input | Accepts 1.6–45V input; withstands ±45V reverse voltage; requires local 1–10µF bypass if >6" from main filter |
| SHDN (Pin 3) | Shutdown Control | Active-low logic input; pulls output off and reduces quiescent current to <1μA; must be connected (not floating) |
| FAULT1 (Pin 4) | Fault Indicator | Open-collector output asserting low when IOUT falls below programmed IMIN threshold (e.g., open-circuit detection) |
| FAULT2 (Pin 5) | Fault Indicator | Open-collector output asserting low during current limit or thermal shutdown; both FAULT1/FAULT2 low = thermal fault |
| PWRGD (Pin 6) | Power Good | Open-collector output asserting low when VOUT drops below 90% of nominal (3.3V → 2.97V); 1% hysteresis prevents chatter |
| TEMP (Pin 7) | Diagnostics Output | Analog voltage proportional to average die temperature (250mV @ 25°C, +10mV/°C); stable with 100pF–1nF bypass |
| IMON (Pin 8) | Current Monitor | Sinks 1/500th of IOUT; requires ≥22nF decoupling; tied to GND if unused |
| IMIN (Pin 9) | Min Current Threshold | Programs minimum IOUT fault threshold via resistor to GND; left floating if not used |
| GND (Pins 10, 11, 13, 17) | Ground Reference | Multiple GND connections including exposed pad (Pin 17); all must be low-impedance to PCB ground plane |
| REF/BYP (Pin 12) | Reference Bypass | Connects to 10nF capacitor for soft-start and noise reduction; critical for achieving 25μVRMS output noise |
| IMAX (Pin 14) | Current Limit Set | Resistor to GND programs precision current limit (±10%); tie to GND for internal short-circuit protection only |
| ADJ/SENSE (Pin 15) | Feedback Node | Internally connected to regulated 3.3V output; not adjustable-used for internal feedback path |
| OUT (Pins 16, 16) | Regulated Output | Delivers 3.3V at up to 500mA; requires ≥3.3μF low-ESR ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Precision current limit programming | External IMAX resistor sets ±10% accurate current limit across wide input voltage and temperature ranges |
| Integrated open-circuit detection | IMIN pin enables programmable minimum output current monitoring to flag load disconnection or failure |
| Real-time die temperature reporting | TEMP pin delivers calibrated 10mV/°C analog output-enables thermal derating and system-level thermal management |
| Ultra-low-noise regulation | 25μVRMS noise (10Hz–100kHz) with 10nF REF/BYP capacitor supports sensitive RF, ADC, and DSP power domains |
| Robust reverse polarity protection | Withstands ±45V on IN pin; blocks reverse current flow without external diodes-ideal for battery-reversal-prone applications |
| Diagnostic-ready interface | Four dedicated pins (FAULT1, FAULT2, PWRGD, TEMP) provide comprehensive real-time health monitoring for safety-critical systems |
Applications
| Protected Antenna Supplies | Automotive Telematics |
|---|---|
Use Scenario: Powering GPS/GNSS and cellular antenna modules in vehicle-mounted infotainment and telematics units. IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering clean, regulated power with reverse-battery protection and thermal fault signaling. Use Value: Prevents damage from accidental battery reversal; FAULT2 alerts MCU to antenna short-circuit events before thermal runaway occurs. | Use Scenario: Supplying power to LTE modems, CAN gateway processors, and OTA update controllers in fleet management systems. IC Role / Device Role / Timing Role: High-reliability 3.3V supply with diagnostics for mission-critical communication subsystems operating across –40°C to 125°C. Use Value: PWRGD confirms valid rail presence before firmware boot; TEMP pin enables dynamic throttling during high-ambient-temperature operation. |
| Industrial Truck Electronics | Noise-Sensitive RF Supplies |
Use Scenario: Powering display controllers, sensor fusion units, and hydraulic control logic in forklifts and material handling equipment. IC Role / Device Role / Timing Role: Main 3.3V regulator with wide 1.6–45V input range accommodating battery voltage sag and load-dump transients. Use Value: Withstands 45V transients without latch-up; IMON enables predictive maintenance by tracking motor driver current trends over time. | Use Scenario: Providing ultra-low-noise 3.3V bias to RF front-end LNAs, mixers, and high-speed ADC clock buffers in test equipment. IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator with 10nF REF/BYP bypass to minimize phase noise and spurious emissions. Use Value: 25μVRMS noise floor preserves signal integrity; stable with 3.3μF ceramic caps simplifies layout in dense RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3026EDD-3.3#PBF | Lower 300mA output, no IMIN/TEMP/FAULT diagnostics, 20μVRMS noise, 2mm × 2mm DFN | Lacks current monitoring and thermal reporting-suitable only for basic regulation where diagnostics are unnecessary | Select when board space is constrained and diagnostic features are omitted from system requirements |
| TPS7A8300RGRT | 500mA, 25μVRMS noise, but no current limit programming, no FAULT pins, no TEMP output, 2.5V–6.5V input only | Missing robust diagnostics and wide-input capability-requires upstream protection for automotive/industrial use | Choose only for benign 3.3V–5V input environments where full LT3055IDE-3.3#PBF diagnostic suite is not required |
Compared with LTC3026EDD-3.3#PBF and TPS7A8300RGRT, the LT3055IDE-3.3#PBF uniquely combines 500mA output, ±45V input tolerance, precision programmable current limit, and four independent diagnostic outputs-making it the only option qualified for high-reliability, fault-aware power delivery in automotive and industrial edge nodes.
Availability
LT3055IDE-3.3#PBF is available at Aetrix Electronics and suitable for protected antenna supplies, automotive telematics, and industrial truck electronics requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3055IDE-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, industrial automation, and automotive markets.
The LT3055 series was designed specifically for high-reliability, diagnostic-rich power management in harsh environments-emphasizing robustness, precision current limiting, and real-time health monitoring for automotive telematics and industrial control systems.
FAQ
What is the guaranteed dropout voltage of the LT3055IDE-3.3#PBF at 500mA load?
The LT3055IDE-3.3#PBF guarantees a maximum dropout voltage of 590mV at 500mA load across temperature, with a typical value of 350mV at 25°C. This allows reliable 3.3V regulation down to VIN = 3.65V under worst-case conditions, making it suitable for battery-powered systems with significant voltage sag.
How does the IMON pin on the LT3055IDE-3.3#PBF function, and what is its accuracy?
The IMON pin on the LT3055IDE-3.3#PBF sources a current equal to 1/500th of the output current (IOUT/500), with a typical ratio of 500mA/mA and ±10% accuracy over temperature and load. For example, at 500mA IOUT, IMON delivers 1mA-enabling precise external current sensing without shunt resistors or amplifiers.
Can the LT3055IDE-3.3#PBF operate safely with reverse battery connection?
Yes-the LT3055IDE-3.3#PBF includes integrated reverse battery protection. When the IN pin is driven negative relative to GND (e.g., –45V), the device blocks reverse current flow and prevents reverse voltage from appearing at the OUT pin, protecting both itself and downstream circuitry without external components.
What is the purpose of the TEMP pin on the LT3055IDE-3.3#PBF, and how is it calibrated?
The TEMP pin on the LT3055IDE-3.3#PBF outputs a voltage proportional to average die temperature: 250mV at 25°C with a slope of 10mV/°C (±80mV error over –40°C to 125°C). It requires no external calibration and is stable with a 100pF bypass capacitor-enabling direct ADC measurement for thermal monitoring and derating.
Does the LT3055IDE-3.3#PBF require an external resistor divider to set its output voltage?
No-the LT3055IDE-3.3#PBF is a fixed-output variant; its 3.3V regulation is achieved internally. The ADJ/SENSE pin (Pin 15) is internally connected to the output and does not require external resistors. External resistors are only needed on IMAX (current limit) and IMIN (minimum current fault) pins for diagnostic configuration.
LT3055IDE-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 0.59V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 130 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:
- 16-DFN (4x3)
LT3055IDE-3.3#PBF FAQ
1.How can I place an order for LT3055IDE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3055IDE-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 LT3055IDE-3.3#PBF reliable?
The price and inventory of LT3055IDE-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 LT3055IDE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT3055IDE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3055IDE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3055IDE-3.3#PBF?
LT3055IDE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3055IDE-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 LT3055IDE-3.3#PBF?
For technical support, including LT3055IDE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3055IDE-3.3#PBF requirements.
6.How does Aetrix verify that LT3055IDE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT3055IDE-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 LT3055IDE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT3055IDE-3.3#PBF?
All LT3055IDE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3055IDE-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 LT3055IDE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT3055IDE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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