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Analog Devices Inc. LTC3255HDD#TRPBF
- Part No.:
- LTC3255HDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3255HDD#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,638
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Product details
Overview
LTC3255HDD#TRPBF from Analog Devices (formerly Linear Technology) is a thermally enhanced, high-temperature-rated switched-capacitor step-down DC/DC converter optimized for 4mA–20mA current loop power conversion. It delivers up to 7.4mA output from a 4mA input in shunt mode, supports 4V–48V input and 2.4V–12.5V adjustable output, and operates reliably up to 150°C junction temperature in its 3mm × 3mm 10-lead DFN package.
For engineers reviewing the LTC3255HDD#TRPBF datasheet, LTC3255HDD#TRPBF pinout, LTC3255HDD#TRPBF application, or LTC3255HDD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world current-loop implementation guidance - all specific to the H-grade industrial temperature variant.
Technical Context
The LTC3255HDD#TRPBF implements multimode capacitive charge pumping with automatic 2:1/1:1 ratio switching when SHUNT = GND, and forced 2:1 operation with integrated VIN shunt regulation when SHUNT = BIAS. Its Burst Mode® control loop achieves 16µA quiescent current at no load while maintaining regulation across wide input/output combinations.
It integrates reverse-polarity input protection (–52V to 60V), overtemperature shutdown (175°C trip, ~165°C recovery), short-circuit current limiting (120mA), and open-drain PGOOD with 90–98% regulation threshold hysteresis - all operating within its guaranteed –40°C to 150°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 48V - supports wide industrial supply rails and current-loop compliance voltages. |
| Output Voltage Range | 2.4V to 12.5V adjustable via FB resistor divider - enables flexible biasing of sensors, ADCs, and transmitters. |
| Max Output Current | 50mA (shunt disabled) or 7.4mA continuous (shunt enabled, 4mA input) - defines usable load capacity in current-fed vs voltage-fed configurations. |
| Quiescent Current | 16µA at no load in regulation - minimizes standby power loss in always-on loop-powered systems. |
| Junction Temp Range | –40°C to 150°C - certified for harsh environments including factory automation and downhole instrumentation. |
| Oscillator Frequency | 500kHz - enables compact external capacitor selection and low-noise operation without EMI filters. |
| PGOOD Threshold | 94% of final VOUT (typical) - provides precise power-valid signaling for downstream microcontrollers or safety monitors. |
Pinout & Package
The LTC3255HDD#TRPBF uses a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) tied to GND. The exposed pad must be soldered to PCB ground for thermal and electrical integrity. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive node | Connects to + terminal of flying capacitor; not externally driven - critical for 2:1 charge transfer phase timing. |
| VOUT (Pin 2) | Regulated output voltage | Delivers final regulated output; requires ≥1µF low-ESR ceramic capacitor to ground for ripple suppression. |
| FB (Pin 3) | Feedback reference input | Servo point for 1.200V internal reference; sets output voltage via external resistor divider (RA/RB). |
| SHUNT (Pin 4) | Shunt regulator enable/disable | Connect to BIAS to activate VIN shunt for current-loop operation; connect to GND to disable shunt and enable auto-switching modes. |
| PGOOD (Pin 5) | Open-drain power-good indicator | Signals valid regulation (≥94% VOUT); requires external pull-up to VOUT or system rail for logic-level assertion. |
| EN (Pin 6) | Enable control input | Logic-high (>1.4V) enables device; logic-low (<0.4V) shuts down all circuitry except bias - reduces VIN current to 3µA. |
| BIAS (Pin 7) | Internal bias supply bypass | Must connect ≥0.1µF ceramic capacitor (10V rating min) to GND - stabilizes internal reference and oscillator. |
| GND (Pins 8 & 11) | Ground reference and thermal path | Pins 8 and 11 (exposed pad) are internally connected to GND; exposed pad must be soldered to PCB ground plane for thermal management. |
| C– (Pin 9) | Flying capacitor negative node | Connects to – terminal of flying capacitor; not externally driven - completes charge pump switching path. |
| VIN (Pin 10) | Main input supply | Accepts 4V–48V input; requires ≥1µF low-ESR ceramic bypass capacitor to GND near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VIN shunt regulator | Enables direct operation from 4mA–20mA current loops without external shunt resistors - eliminates 250Ω burden and associated heat. |
| Multimode charge pump (2:1/1:1) | Automatically selects optimal ratio based on VIN/VOUT ratio and load - maintains regulation across full 4V–48V input range without manual configuration. |
| Reverse-polarity input tolerance | Withstands –52V on VIN or EN without damage - protects against wiring errors in field-deployed industrial equipment. |
| Thermally robust H-grade packaging | Guaranteed operation to 150°C junction temperature with validated thermal resistance (θJA = 43°C/W) - suitable for enclosed enclosures and high-ambient environments. |
| Burst Mode® regulation | Reduces no-load quiescent current to 16µA while preserving fast transient response - extends battery life in backup-powered loop devices. |
Applications
| 4mA–20mA Loop-Powered Sensor Transmitter | Industrial Housekeeping Power Supply |
|---|---|
Use Scenario: Powering a 2-wire pressure sensor transmitter in a hazardous area where only loop current is available. IC Role / Device Role / Timing Role: LTC3255HDD#TRPBF acts as current-boosting voltage regulator, converting 4mA loop current into stable 3.3V/7.4mA for sensor IC and signal conditioning circuitry. Use Value: Eliminates need for local 24V supply or bulky shunt resistor; enables true 2-wire design with <3.5V compliance overhead at 3.3V output. |
Use Scenario: Providing auxiliary 5V rail for microcontroller, EEPROM, and interface logic in a PLC backplane module. IC Role / Device Role / Timing Role: LTC3255HDD#TRPBF serves as inductor-free step-down converter from 24V system rail, replacing inefficient linear regulators. Use Value: Delivers >80% efficiency at 50mA load (vs ~21% for LDO), reducing thermal load and enabling compact layout in space-constrained modules. |
| SCADA Remote Terminal Unit (RTU) | Factory Automation Field Interface |
Use Scenario: Powering isolated analog input channels and RS-485 transceivers in an outdoor RTU exposed to ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: LTC3255HDD#TRPBF supplies 12V at 10mA for precision op-amps and 3.3V at 20mA for digital logic, leveraging its wide VIN range and H-grade thermal rating. Use Value: Maintains regulation across 12V–48V battery/solar input fluctuations and survives 150°C junction conditions during summer peak loading. |
Use Scenario: Generating 5V for IO-link master ASIC and 3.3V for FPGA configuration in a DIN-rail mounted I/O module. IC Role / Device Role / Timing Role: LTC3255HDD#TRPBF replaces buck converter due to EMI-sensitive environment - zero inductor enables clean signal integrity near analog inputs. Use Value: Achieves <10mVpp output ripple with ceramic caps alone, avoiding magnetic coupling into adjacent 4–20mA analog channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3255IDD#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C junction - lower max temperature grade. | Not qualified for continuous operation above 125°C ambient in thermally constrained enclosures. | Select when ambient temperature remains ≤85°C and cost optimization is prioritized over extended thermal margin. |
| LTC3255HMSE#TRPBF | Identical electrical specs and thermal rating, but in 10-lead MSOP package (θJA = 40°C/W) - slightly better thermal resistance but larger footprint (3mm × 3mm DFN vs 3mm × 4.9mm MSOP). | Preferred where board space allows larger package and thermal performance margin is critical over footprint density. | Choose when PCB layout permits MSOP and junction-to-ambient thermal drop must be minimized below 43°C/W. |
Compared with LTC3255IDD#TRPBF, the LTC3255HDD#TRPBF adds guaranteed 150°C operation and tighter thermal validation; compared with LTC3255HMSE#TRPBF, it trades 3°C/W higher θJA for 35% smaller footprint - making it optimal for high-density, high-temperature industrial modules.
Availability
LTC3255HDD#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation, SCADA systems, and current-loop sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3255HDD#TRPBF 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 acquired Linear Technology in 2017 and maintains full product continuity, documentation, and support for the LTC portfolio. Linear's legacy expertise in precision analog and power management remains core to ADI's industrial strategy.
The LTC3255 belongs to Linear's high-reliability switched-capacitor DC/DC converter family, designed specifically for current-loop powered instrumentation, ruggedized industrial subsystems, and space-constrained housekeeping supplies where inductors are prohibited.
FAQ
What is the maximum junction temperature specification for the LTC3255HDD#TRPBF?
The LTC3255HDD#TRPBF is fully specified and guaranteed to operate continuously at a maximum junction temperature of 150°C. This H-grade qualification distinguishes it from E- and I-grade variants and is validated per JEDEC JESD51-5 thermal testing standards using its 3mm × 3mm DFN package with exposed pad soldered to PCB ground.
How does the LTC3255HDD#TRPBF achieve current boosting in 4mA–20mA loop applications?
The LTC3255HDD#TRPBF achieves current boosting by enabling its integrated VIN shunt regulator (via SHUNT = BIAS connection), which forces 2:1 charge-pump operation. In this mode, a 4mA input current can sustain a 7.4mA output load at 3.3V - effectively multiplying available current while maintaining loop compliance below 2×VOUT + 3.5V.
Can the LTC3255HDD#TRPBF operate without an external flying capacitor?
No - the LTC3255HDD#TRPBF requires an external ceramic flying capacitor (CFLY) connected between C+ and C– pins. The device relies on this capacitor to store and transfer charge during both 2:1 and 1:1 switching phases. A minimum of 0.4µF capacitance over temperature and bias is required to guarantee rated output current performance.
What protection features are built into the LTC3255HDD#TRPBF?
The LTC3255HDD#TRPBF integrates reverse-polarity input protection (–52V to 60V on VIN/EN), output short-circuit current limiting (120mA typical), overtemperature shutdown (175°C trip), and undervoltage lockout with hysteresis. These protections operate independently of external components and remain active across its full –40°C to 150°C junction temperature range.
Is the LTC3255HDD#TRPBF pin-compatible with other LTC3255 variants?
Yes - all LTC3255 variants, including LTC3255HDD#TRPBF, LTC3255IDD#TRPBF, and LTC3255HMSE#TRPBF, share identical pinouts and electrical functionality. The only differences are temperature grade (H vs I), package type (DFN vs MSOP), and thermal resistance - allowing direct substitution where thermal and mechanical constraints permit.
LTC3255HDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 48V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 12.5V
- Current - Output:
- 50mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3255HDD#TRPBF FAQ
1.How can I place an order for LTC3255HDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255HDD#TRPBF 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 LTC3255HDD#TRPBF reliable?
The price and inventory of LTC3255HDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255HDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255HDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255HDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255HDD#TRPBF?
LTC3255HDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255HDD#TRPBF 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 LTC3255HDD#TRPBF?
For technical support, including LTC3255HDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255HDD#TRPBF requirements.
6.How does Aetrix verify that LTC3255HDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255HDD#TRPBF 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 LTC3255HDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255HDD#TRPBF?
All LTC3255HDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255HDD#TRPBF, 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 LTC3255HDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255HDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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