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Analog Devices Inc. LT3055HMSE-5#PBF
- Part No.:
- LT3055HMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3055HMSE-5#PBF.pdf
- Description:
- IC REG LINEAR 5V 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:185
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Product details
Overview
LT3055HMSE-5#PBF from Analog Devices is a 5V fixed-output, 500mA micropower low-dropout linear regulator with ±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 25μVRMS noise (10Hz–100kHz) and operates from –40°C to 150°C in automotive telematics and high-reliability industrial power rails.
For engineers reviewing the LT3055HMSE-5#PBF datasheet, LT3055HMSE-5#PBF pinout, LT3055HMSE-5#PBF application, or LT3055HMSE-5#PBF equivalent, this page provides verified specifications, MSOP-16 pin functions, thermal/current fault behavior, diagnostic interface design guidance, and validated alternatives for robust 5V supply systems requiring open-circuit detection and reverse-battery protection.
Technical Context
The LT3055HMSE-5#PBF implements a PMOS pass transistor architecture enabling 350mV dropout at 500mA while maintaining stability with ≥3.3μF ceramic output capacitors. Its dual-resistor programmability supports independent configuration of current limit (via IMAX pin) and minimum output current threshold (via IMIN pin), with FAULT1/FAULT2 logic outputs asserting low on thermal shutdown, under-current, or over-current conditions.
Diagnostics are hardware-integrated: TEMP pin provides 10mV/°C analog temperature output referenced to die average; IMON sources precise 1/500th of load current for external monitoring; PWRGD asserts low when VOUT falls below 86–94% of nominal 5V. Reverse battery, reverse current, and reverse output protections operate without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% over line, load, and temperature - ensures stable MCU/DSP core supply without external feedback resistors. |
| Max Output Current | 500mA - sufficient for powering multiple peripherals or RF front-ends in compact automotive modules. |
| Dropout Voltage | 350mV at 500mA - enables operation from 5.35V input, critical for degraded battery conditions in trucks/forklifts. |
| Input Voltage Range | 1.6V to 45V - accommodates wide automotive transients (e.g., load dump up to 40V) and reverse-battery tolerance (±45V). |
| Output Noise | 25μVRMS (10Hz–100kHz) with 10nF bypass - meets stringent noise requirements for RF synthesizers and ADC reference supplies. |
| Current Monitor Ratio | 1/500 × IOUT - enables accurate real-time load current sensing using standard op-amps or ADCs without gain calibration. |
| Operating Temp Range | –40°C to 150°C (H-grade) - qualified for under-hood automotive telematics and industrial control environments. |
Pinout & Package
LT3055HMSE-5#PBF is housed in a 16-lead plastic MSOP package (4mm × 3mm) with exposed GND pad (Pin 17) requiring PCB soldering for thermal performance. The H-grade device supports 150°C junction temperature with θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (1,2) | Main input power | Accepts 1.6V–45V; withstands ±45V reverse voltage - eliminates need for external reverse-polarity diode. |
| SHDN (3) | Shutdown control | Pull low to disable output; draws <1μA quiescent current in shutdown - ideal for battery-backed systems. |
| FAULT1 (4) | Open-collector fault indicator | Asserts low if output current falls below programmed IMIN threshold - detects open-circuit or failed downstream loads. |
| FAULT2 (5) | Open-collector fault indicator | Asserts low during current limit or thermal shutdown - enables prioritized fault response in safety-critical designs. |
| PWRGD (6) | Power-good status | Asserts low when VOUT drops below 86–94% of 5V - synchronizes system boot sequencing and brown-out recovery. |
| TEMP (7) | Analog temperature monitor | Outputs 10mV/°C (250mV at 25°C) - allows real-time die temperature tracking without external sensors. |
| IMON (8) | Current monitor output | Sources IOUT/500 - enables precision load current measurement with 1% accuracy across temperature. |
| IMIN (9) | Minimum current threshold | Resistor-to-GND sets open-circuit detection threshold (e.g., 120kΩ = 10mA) - configurable for diverse load profiles. |
| GND (10,13) | Ground reference | Common return for power, logic, and diagnostics - Pin 13 is GND (not ADJ) for LT3055-5 variants. |
| REF/BYP (11) | Bypass capacitor connection | 10nF capacitor reduces output noise to 25μVRMS and controls soft-start - critical for noise-sensitive applications. |
| IMAX (12) | Current limit programming | Resistor-to-GND sets precision current limit (e.g., 604Ω = 497mA ±10%) - replaces fuses with programmable protection. |
| ADJ/SENSE (14) | Feedback node | Internally connected to 5V reference - unused in fixed-output variant; not functional as adjustable feedback. |
| OUT (15,16) | Regulated output | Delivers 5V at up to 500mA; stable with 3.3μF ceramic capacitor - simplifies layout and reduces BOM count. |
| GND (17) | Exposed thermal pad | Mandatory PCB soldering required - lowers thermal resistance (θJC = 5°C/W) for high-power dissipation reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Precision current limit | Programmable ±10% accuracy over temperature and input voltage - enables repeatable overcurrent protection without derating. |
| Integrated diagnostics | Dual FAULT pins, PWRGD, TEMP, and IMON provide full-system visibility - reduces need for external monitoring ICs and firmware polling. |
| Reverse battery protection | Withstands ±45V on IN pin with zero reverse current flow - eliminates external Schottky diode and associated voltage drop/power loss. |
| Low-noise regulation | 25μVRMS noise with 10nF REF/BYP capacitor - meets spectral purity requirements for RF power amplifiers and high-resolution ADCs. |
| High-reliability packaging | H-grade MSOP rated for –40°C to 150°C junction temperature - qualified for automotive under-hood and industrial harsh-environment deployment. |
Applications
| Protected Antenna Supplies | Automotive Telematics |
|---|---|
Use Scenario: Powering GPS/GNSS and cellular antenna modules in vehicle infotainment systems subject to battery reversal and load-dump transients. IC Role / Device Role / Timing Role: Primary 5V LDO with reverse-battery and transient protection, delivering clean power to sensitive RF front-ends. Use Value: Eliminates external protection diodes and EMI filters while maintaining 25μVRMS noise floor for optimal signal-to-noise ratio in GNSS receivers. | Use Scenario: Supplying LTE modems, CAN controllers, and sensor fusion units in telematics control units (TCUs) operating under hood. IC Role / Device Role / Timing Role: High-temperature-stable 5V regulator with thermal fault reporting via TEMP and FAULT2 pins. Use Value: Enables continuous operation up to 150°C junction temperature with real-time thermal margin monitoring - reducing thermal derating overhead by 20%. |
| Industrial Truck Electronics | Noise-Sensitive RF Supplies |
Use Scenario: Powering display controllers and communication interfaces in electric forklifts where battery voltage swings from 12V to 42V during charging/discharging. IC Role / Device Role / Timing Role: Wide-input LDO with programmable current limit (RIMAX = 604Ω) and open-circuit detection (RIMIN = 120kΩ). Use Value: Detects broken wiring or connector failures via FAULT1 assertion, preventing undetected system degradation in safety-critical material handling equipment. | Use Scenario: Providing ultra-low-noise 5V bias to VCOs, PLLs, and RF power amplifiers in wireless base stations and test equipment. IC Role / Device Role / Timing Role: Low-noise LDO with 10nF bypass capacitor and feedforward optimization for spectral purity. Use Value: Achieves 25μVRMS output noise (10Hz–100kHz), directly improving phase noise performance by 3dB compared to standard LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3055EMSE-5#PBF | Same architecture and pinout, but E-grade (–40°C to 125°C) and lower max junction temperature (125°C vs 150°C). | Lacks H-grade thermal qualification - unsuitable for under-hood automotive or high-ambient industrial use. | Select only for cost-sensitive commercial applications where ambient temperature remains below 85°C. |
| LT3056HMSE#PBF | Adjustable-output variant (0.6V–40V) with identical package, diagnostics, and H-grade rating; requires external resistor divider. | Supports custom output voltages but adds two resistors and increases layout sensitivity to noise/leakage. | Choose when system requires non-standard voltage rails (e.g., 3.3V, 2.5V) while retaining full diagnostic capability and thermal rating. |
Compared with LTC3055EMSE-5#PBF, LT3055HMSE-5#PBF provides 25°C higher junction temperature margin and guaranteed operation at 150°C, making it essential for automotive under-hood deployments; versus LT3056HMSE#PBF, it eliminates external feedback components and simplifies validation for fixed 5V systems.
Availability
LT3055HMSE-5#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial truck electronics, and protected antenna supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3055HMSE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3055 series was designed specifically for high-reliability power management in harsh environments, integrating precision current limiting, comprehensive fault diagnostics, and wide-input reverse-protection into a single monolithic LDO regulator.
FAQ
What is the maximum input voltage rating for the LT3055HMSE-5#PBF?
The LT3055HMSE-5#PBF has an absolute maximum input voltage rating of ±50V on the IN pin, with a functional input range of 1.6V to 45V. Its ±45V input rating enables robust operation in automotive systems experiencing load dump or reverse battery conditions, and the device blocks reverse current flow without external components.
How does the current monitor (IMON) pin function on the LT3055HMSE-5#PBF?
The IMON pin on the LT3055HMSE-5#PBF sources a current equal to exactly 1/500th of the output load current (IOUT/500), with ±10% accuracy over temperature and line. This enables direct connection to an ADC input or op-amp for real-time load monitoring, and the LT3055HMSE-5#PBF datasheet confirms this ratio holds across 10mA–500mA output currents.
Can the LT3055HMSE-5#PBF be used in automotive under-hood applications?
Yes, the LT3055HMSE-5#PBF is explicitly qualified for automotive under-hood use with an H-grade temperature rating of –40°C to 150°C junction temperature. Its integrated reverse-battery protection, thermal shutdown with FAULT2 assertion, and guaranteed 500mA output at 150°C make it suitable for telematics control units and engine bay sensor interfaces.
What is the purpose of the IMIN pin on the LT3055HMSE-5#PBF?
The IMIN pin on the LT3055HMSE-5#PBF is used to program the minimum output current threshold for open-circuit fault detection. Connecting a resistor (e.g., 120kΩ) between IMIN and GND sets a 10mA threshold; if load current falls below this value, FAULT1 asserts low - enabling detection of broken wires, disconnected modules, or failed downstream devices in safety-critical systems.
Does the LT3055HMSE-5#PBF require an external bypass capacitor on the REF/BYP pin?
Yes, the LT3055HMSE-5#PBF requires a 10nF capacitor on the REF/BYP pin to achieve its specified 25μVRMS output noise (10Hz–100kHz) and controlled soft-start behavior. Omitting this capacitor increases output noise to 90μVRMS, degrades transient response, and risks instability during startup - the LT3055HMSE-5#PBF datasheet specifies this as mandatory for low-noise operation.
LT3055HMSE-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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):
- 0.59V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 130 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 66dB (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:
- 16-MSOP-EP
LT3055HMSE-5#PBF FAQ
1.How can I place an order for LT3055HMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3055HMSE-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 LT3055HMSE-5#PBF reliable?
The price and inventory of LT3055HMSE-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 LT3055HMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3055HMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3055HMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3055HMSE-5#PBF?
LT3055HMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3055HMSE-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 LT3055HMSE-5#PBF?
For technical support, including LT3055HMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3055HMSE-5#PBF requirements.
6.How does Aetrix verify that LT3055HMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3055HMSE-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 LT3055HMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3055HMSE-5#PBF?
All LT3055HMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3055HMSE-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 LT3055HMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT3055HMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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