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Analog Devices Inc. LTC3255IDD#TRPBF
- Part No.:
- LTC3255IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3255IDD#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
LTC3255IDD#TRPBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter designed for current-fed industrial power rails, especially 4mA–20mA current loops. It delivers up to 50mA output current with adjustable regulated output (2.4V–12.5V) from 4V–48V input, features 16µA no-load quiescent current, integrated VIN shunt regulator, and fault protection including reverse-polarity input tolerance (–52V to 60V) and short-circuit survival.
For engineers reviewing the LTC3255IDD#TRPBF datasheet, LTC3255IDD#TRPBF pinout, LTC3255IDD#TRPBF application, or LTC3255IDD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (2:1/1:1 automatic switching), real-world current-boosting capability (7.4mA load from 4mA loop), and thermal design guidance for industrial control and SCADA systems.
Technical Context
The LTC3255IDD#TRPBF implements a multimode switched-capacitor architecture with automatic 2:1 or 1:1 charge-pump ratio selection based on VIN, VOUT, and load-ensuring regulation across its full 4V–48V input range. Its internal shunt regulator, enabled by connecting SHUNT to BIAS, allows stable operation from high-impedance current sources while maintaining fixed 2:1 conversion for current multiplication.
Burst Mode® regulation maintains 1.200V ±2.4mV feedback reference (FB pin) with ±10nA leakage, enabling ultra-low 16µA quiescent current at no load. The device integrates overtemperature shutdown (175°C trip), output current limiting (120mA), and open-drain PGOOD with 94% rising threshold-critical for fault-tolerant housekeeping supplies in factory automation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 48V - supports wide industrial supply rails and current-loop compliance margins. |
| Output Voltage Range | 2.4V to 12.5V adjustable via FB resistor divider - enables single-part support for 3.3V, 5V, and 12V system rails. |
| Max Output Current | 50mA (shunt disabled); 7.4mA continuous from 4mA input (shunt enabled) - delivers current multiplication for loop-powered sensors. |
| Quiescent Current | 16µA at no load in regulation - extends uptime in low-power monitoring nodes. |
| Fault Protection | Reverse-polarity input (–52V), output short-circuit survival, overtemperature shutdown (175°C), and 120mA current limit - eliminates need for external protection circuitry. |
| Package | 10-lead 3mm × 3mm DFN with exposed GND pad - optimized for thermal dissipation (θJA = 43°C/W) in compact industrial PCBs. |
| Oscillator Frequency | 500kHz fixed - enables small flying capacitor (≥0.4µF) and low EMI without inductors. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed GND pad (Pin 11), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive node | Connects to + terminal of external flying capacitor; not externally driven - critical for 2:1 charge transfer phase. |
| VOUT (Pin 2) | Regulated output voltage rail | Delivers final stepped-down voltage; requires ≥1µF low-ESR ceramic output capacitor for ripple control. |
| FB (Pin 3) | Feedback sensing input | Serves 1.200V reference point; connected to resistor divider between VOUT and GND to set output voltage. |
| SHUNT (Pin 4) | Shunt regulator enable/disable control | Connect to BIAS to enable VIN shunt mode (for current loops); connect to GND to disable - floating prohibited. |
| PGOOD (Pin 5) | Open-drain power-good indicator | High-impedance when VOUT reaches ≥94% of target; requires external pull-up to signal valid regulation. |
| EN (Pin 6) | Enable logic input | Logic-high (>1.4V) enables operation; logic-low (<0.4V) shuts down IC - can tie to VIN if always-on operation required. |
| BIAS (Pin 7) | Internal bias supply bypass | Must connect ≥0.1µF ceramic capacitor (10V rating) to GND - stabilizes internal regulators and reduces noise. |
| GND (Pins 8 & 11) | Ground reference and thermal path | Pins 8 and 11 (exposed pad) are internally tied to GND; exposed pad is mandatory for thermal performance. |
| C– (Pin 9) | Flying capacitor negative node | Connects to – terminal of external flying capacitor; not externally driven - completes charge-pump switching path. |
| VIN (Pin 10) | Main input supply connection | Accepts 4V–48V input; requires ≥1µF low-ESR ceramic bypass capacitor to suppress transients and ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Multimode charge pump | Automatically switches between 2:1 and 1:1 ratios to maintain regulation across full VIN range - eliminates manual mode selection or external control logic. |
| VIN shunt regulator | Enables direct operation from 4mA–20mA current loops by clamping VIN to ~2×VOUT + 3.5V - removes need for external shunt transistor or Zener. |
| Burst Mode® regulation | Reduces no-load VIN current to 16µA while maintaining tight output regulation - ideal for battery-backed or energy-harvested sensor nodes. |
| Fault-hardened inputs | Withstands –52V to 60V on VIN/EN and survives indefinite output short-circuits - simplifies design for harsh industrial environments. |
| Integrated PGOOD | Open-drain output asserts high-impedance only when VOUT reaches ≥94% of target - provides reliable power sequencing signal without external comparators. |
Applications
| Industrial Current Loop Power | Factory Automation Housekeeping |
|---|---|
|
Use Scenario: Powering analog sensor transmitters and field devices in 4mA–20mA current-loop systems where VIN is current-limited and voltage compliance is constrained. IC Role / Device Role / Timing Role: Step-down charge pump with integrated VIN shunt regulator acting as current-to-voltage converter and local 3.3V/5V supply generator. Use Value: Enables 7.4mA continuous output from a 4mA loop input - eliminates need for auxiliary power or larger loop compliance voltage. |
Use Scenario: Providing clean, regulated auxiliary power for microcontrollers, ADCs, and communication interfaces in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Inductor-free DC/DC converter delivering stable 3.3V or 5V rail from wide-input industrial bus (12V–48V). Use Value: Achieves >80% efficiency at 50mA load without magnetic components - reduces board area, EMI, and cost versus buck converters. |
| SCADA Remote Terminal Unit (RTU) | Harsh-Environment Sensor Node |
|
Use Scenario: Power management in remote telemetry units deployed in oil/gas, water treatment, or transportation infrastructure with unreliable or wide-range DC supplies. IC Role / Device Role / Timing Role: Fault-tolerant housekeeping supply with reverse-polarity and overvoltage protection, supporting long-term unattended operation. Use Value: Survives –52V reverse input and 60V surges without damage - avoids field failures due to wiring errors or lightning-induced transients. |
Use Scenario: Compact, low-power supply for wireless sensor nodes operating in extreme temperatures (–40°C to 125°C ambient). IC Role / Device Role / Timing Role: Regulated output source with 16µA quiescent current and thermal shutdown (175°C) for intermittent wake-up operation. Use Value: Maintains regulation during cold-start and hot ambient conditions - ensures reliable startup and sustained operation across full industrial grade range. |
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 |
|---|---|---|---|
| LTC3265IDD#TRPBF | Wider input range (4.5V–32V), lower max output current (25mA), integrated LDO post-regulator, no VIN shunt mode. | Targeted at low-noise precision analog supplies rather than current-loop boosting; lacks 4mA-to-7.4mA current multiplication. | Select LTC3265IDD#TRPBF only when ultra-low output ripple (<10mV) and dual-stage regulation are required - not suitable for current-fed VIN. |
| MAX17521ATP+T | Inductor-based synchronous buck (4.5V–60V input), higher output current (200mA), no shunt regulator, requires external inductor and compensation. | Used where higher power and tighter load regulation are needed; incompatible with current-loop sourcing due to minimum load and inductor dependency. | Choose MAX17521ATP+T for >100mA loads or when input exceeds 48V - but adds BOM cost, size, and EMI filtering complexity absent in LTC3255IDD#TRPBF. |
Compared with LTC3265IDD#TRPBF and MAX17521ATP+T, the LTC3255IDD#TRPBF uniquely combines current-loop compatibility, inductor-free operation, and robust fault protection - making it the only choice for space-constrained, current-fed industrial sensors requiring 7.4mA from 4mA input.
Availability
LTC3255IDD#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and SCADA systems requiring stable component supply, extended temperature operation (–40°C to 125°C), and fault-tolerant power conversion.
Supply support for LTC3255IDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for industrial, automotive, communications, and healthcare markets.
The LTC3255IDD#TRPBF belongs to Linear's legacy switched-capacitor DC/DC converter family, engineered specifically for current-fed industrial power applications where inductor-free, fault-hardened, and loop-compatible regulation is essential.
FAQ
What is the maximum output current capability of the LTC3255IDD#TRPBF in shunt-enabled mode?
The LTC3255IDD#TRPBF delivers up to 7.4mA continuous output current when the SHUNT pin is connected to BIAS and powered from a 4mA current source at 3.3V output. This current multiplication is achieved by locking the charge pump into 2:1 mode and leveraging the integrated VIN shunt regulator - a capability confirmed in the datasheet's "Available Output Current vs Input Current" graph and Electrical Characteristics table under IVOUT (shunt enabled).
Can the LTC3255IDD#TRPBF operate from a reverse-polarity input supply?
Yes, the LTC3255IDD#TRPBF withstands reverse-polarity input voltages down to –52V on VIN and EN pins without damage, as specified in Absolute Maximum Ratings. When VIN goes below ground, internal protection diodes prevent VOUT from dropping more than one diode drop below GND - preserving downstream circuit integrity. This feature is explicitly validated and documented for the LTC3255IDD#TRPBF in the "Reverse Polarity Input Protection" section of the datasheet.
How does the LTC3255IDD#TRPBF achieve 16µA quiescent current at no load?
The LTC3255IDD#TRPBF achieves 16µA VIN quiescent current using Burst Mode® regulation: when the FB pin voltage reaches regulation (1.200V), the IC halts charge transfer and enters a low-power sleep state, powering the load solely from the output capacitor until voltage droop triggers the next burst. This behavior is measured and guaranteed across temperature for the LTC3255IDD#TRPBF, with IVIN = 16µA (typ) listed in the Electrical Characteristics table under "EN High, SHUNT = GND" condition.
What package type and thermal characteristics apply to the LTC3255IDD#TRPBF?
The LTC3255IDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 11), rated for –40°C to 125°C operating junction temperature. Its thermal resistance is θJA = 43°C/W when properly mounted with the exposed pad soldered to a PCB ground plane - a value confirmed in the "Absolute Maximum Ratings" table and "Thermal Management" section of the official datasheet for this specific part number.
Does the LTC3255IDD#TRPBF require external components to set the output voltage?
Yes, the LTC3255IDD#TRPBF requires an external resistor divider between VOUT and GND connected to the FB pin to set the output voltage. The formula RA/RB = VOUT/1.2V – 1 determines the ratio, with RB recommended between 20kΩ and 2MΩ. This configuration is mandatory for regulation and is demonstrated in Figure 1 ("Setting the Output Voltage") of the LTC3255IDD#TRPBF datasheet - no internal trimming or programming interface exists.
LTC3255IDD#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)
LTC3255IDD#TRPBF FAQ
1.How can I place an order for LTC3255IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255IDD#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 LTC3255IDD#TRPBF reliable?
The price and inventory of LTC3255IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255IDD#TRPBF?
LTC3255IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255IDD#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 LTC3255IDD#TRPBF?
For technical support, including LTC3255IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3255IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255IDD#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 LTC3255IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255IDD#TRPBF?
All LTC3255IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255IDD#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 LTC3255IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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