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Analog Devices Inc. LTC3255IDD#PBF
- Part No.:
- LTC3255IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3255IDD#PBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:356
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Product details
Overview
LTC3255IDD#PBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter designed for current-fed industrial power rails. It delivers up to 50mA output current from a 4V–48V input, supports adjustable 2.4V–12.5V output, operates with 16µA quiescent current in Burst Mode®, and integrates VIN shunt regulation for 4mA–20mA current loop applications.
For engineers reviewing the LTC3255IDD#PBF datasheet, LTC3255IDD#PBF pinout, LTC3255IDD#PBF application, or LTC3255IDD#PBF equivalent, this page provides verified functional identity, validated DFN-10 package mapping, confirmed 10-pin terminal roles, exact charge-pump mode behavior (2:1/1:1 auto-switching), and real-world current-boost capability (7.4mA load from 4mA input) - all directly extracted from the official LTC3255 datasheet and product documentation.
Technical Context
The LTC3255IDD#PBF implements a multimode switched-capacitor architecture with automatic 2:1 and 1:1 charge-pump ratio selection based on VIN, VOUT, and load conditions. Its internal shunt regulator enables operation from high-impedance current sources, while the FB pin maintains regulation at 1.200V ±2.4% over temperature and line.
Burst Mode® control reduces no-load VIN current to 16µA, and integrated protection includes reverse-polarity input tolerance (–52V), output short-circuit survival, overtemperature shutdown (175°C trip), and 120mA output current limiting - all active without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 48V - supports wide industrial supply rails including legacy 24V and 48V systems without pre-regulation. |
| Output Voltage Range | 2.4V to 12.5V adjustable via FB resistor divider - enables single-part support across multiple system voltage domains (3.3V, 5V, 12V). |
| Max Output Current | 50mA (shunt disabled) or 7.4mA continuous (shunt enabled, 4mA input) - defines usable load capacity in both voltage-fed and current-fed configurations. |
| Quiescent Current | 16µA at no load in regulation - ensures minimal standby power draw in always-on sensor or loop-powered devices. |
| Charge Pump Modes | Auto-switching 2:1 and 1:1 modes - maintains regulation across full VIN range without manual configuration or mode pins. |
| Shunt Regulator Enable | Configured via SHUNT pin tied to BIAS or GND - enables direct integration into 4–20mA current loops with >10V compliance. |
| Thermal Protection | Overtemperature shutdown at ~175°C with hysteresis - protects device during sustained overload or poor PCB thermal design. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad - provides low θJA = 43°C/W and requires soldered GND pad for thermal and electrical integrity. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Exposed pad must be soldered to PCB ground plane for thermal performance and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive node | Connects to one terminal of external flying capacitor; not externally driven - critical for charge transfer timing and efficiency. |
| VOUT (Pin 2) | Regulated output voltage | Delivers final stepped-down voltage; supplies downstream circuitry and connects to COUT and FB divider. |
| FB (Pin 3) | Feedback sensing input | Monitors output via resistor divider; regulated to 1.200V ±2.4% - sets precise output voltage and enables trimming. |
| SHUNT (Pin 4) | Shunt regulator enable control | Tie to BIAS to activate VIN shunt mode for current-loop operation; tie to GND to disable - no floating allowed. |
| PGOOD (Pin 5) | Open-drain power-good indicator | Signals valid regulation when FB reaches ≥94% of target; requires external pull-up for logic-level interface. |
| EN (Pin 6) | Enable/disable logic input | High = active operation; low = shutdown (3µA VIN current); compatible with 1.4V VIH and 0.4V VIL logic thresholds. |
| BIAS (Pin 7) | Internal bias reference bypass | Must connect to 0.1µF ceramic capacitor (≥10V rating) to GND - stabilizes internal regulators and prevents oscillation. |
| GND (Pins 8 & 11) | Power and thermal ground | Pins 8 and 11 (exposed pad) are internally connected - pad must be soldered to large PCB ground plane for thermal management. |
| C– (Pin 9) | Flying capacitor negative node | Connects to other 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 to GND - critical for noise suppression and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Inductor-free step-down conversion | Eliminates magnetic components, EMI filters, and layout-sensitive inductors - reduces BOM count and board area in space-constrained modules. |
| Current multiplication in shunt mode | Converts 4mA input into 7.4mA continuous output at 3.3V - enables self-powered operation from standard 4–20mA current loops without external boost. |
| Reverse-polarity input tolerance | Withstands –52V on VIN and EN pins - protects against wiring errors in field-deployed industrial equipment. |
| Integrated fault protection | Combines output short-circuit survival, overtemperature shutdown, and input overvoltage lockout (52V) - removes need for external protection ICs or discrete diodes. |
| Low-noise Burst Mode® operation | Maintains 16µA no-load quiescent current while delivering clean output ripple (<20mV p-p at 50mA) - ideal for noise-sensitive analog sensors and precision ADCs. |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed GND pad achieves θJA = 43°C/W - supports reliable operation up to 125°C ambient in sealed enclosures. |
Applications
| Industrial Current Loop Power | Housekeeping Supply for Field Instruments |
|---|---|
Use Scenario: Powering analog front-end circuitry (e.g., 4–20mA transmitter ICs, RTD interfaces) directly from a 4–20mA loop with >10V compliance. IC Role / Device Role / Timing Role: VIN shunt regulator + 2:1 charge pump - regulates stable 3.3V/5V rail while drawing only 4mA from loop. Use Value: Enables loop-powered devices to operate without auxiliary supply or battery - eliminates separate power wiring and reduces system cost. | Use Scenario: Providing clean, low-quiescent auxiliary voltage for microcontrollers, EEPROMs, and digital isolators in PLC I/O modules. IC Role / Device Role / Timing Role: Step-down charge pump with Burst Mode® - delivers 50mA at 3.3V while consuming only 16µA at idle. Use Value: Extends uptime in always-on industrial controllers by minimizing standby power - critical for energy harvesting or battery-backed designs. |
| SCADA Remote Sensor Node | Factory Automation Signal Conditioning |
Use Scenario: Powering wireless sensor transceivers (e.g., LoRaWAN, NB-IoT modems) in remote, unpowered locations using existing 24V DC infrastructure. IC Role / Device Role / Timing Role: Wide-input (4–48V) regulated supply with reverse-polarity protection - accepts variable input from solar-charged batteries or rectified AC lines. Use Value: Ensures robust operation despite polarity reversal during installation or maintenance - reduces field return rates and service costs. | Use Scenario: Generating isolated 5V rails for analog-to-digital signal conditioning stages in motor drive feedback circuits. IC Role / Device Role / Timing Role: Low-noise, capacitor-based DC/DC converter - avoids inductor-induced EMI that could corrupt millivolt-level encoder or current-sense signals. Use Value: Improves measurement accuracy by eliminating switching noise coupling into sensitive analog paths - meets ±0.1% linearity requirements. |
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#PBF | Includes dual low-noise LDOs + inverting charge pump; higher IQ (30µA); fixed 3.3V/5V outputs only. | Designed for precision analog biasing (e.g., op-amp rails), not current-loop boosting. | Select LTC3265IDD#PBF when dual-rail analog supply with ultra-low noise is required - not for 4–20mA current multiplication. |
| MAX17521ATP+T | Synchronous buck controller (external MOSFETs); 4.5–60V input; 500kHz fixed frequency; requires inductor and compensation network. | Higher efficiency (>90%) at >100mA loads but larger solution size and EMI sensitivity. | Select MAX17521ATP+T for higher-current (>100mA), high-efficiency applications where inductor use is acceptable - not for inductor-free, low-IQ, or current-loop use cases. |
Compared with LTC3255IDD#PBF, LTC3265IDD#PBF offers superior analog noise performance but lacks current-boost capability and adjustable output, while MAX17521ATP+T delivers higher efficiency and current capacity at the cost of inductor dependency and increased design complexity - making LTC3255IDD#PBF uniquely suited for compact, inductor-free, current-fed industrial power conversion.
Availability
LTC3255IDD#PBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and SCADA systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3255IDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3255 belongs to Linear's precision switched-capacitor DC/DC converter family, engineered specifically for ruggedized industrial power delivery where inductors are impractical and current-loop compatibility is mandatory.
FAQ
What is the maximum output current capability of the LTC3255IDD#PBF in shunt mode?
The LTC3255IDD#PBF delivers up to 7.4mA continuous output current when the SHUNT pin is connected to BIAS and powered from a 4mA input source at 3.3V output. This current multiplication is achieved via forced 2:1 charge-pump operation and is validated per the LTC3255 datasheet Figure TA01b and Electrical Characteristics table (IVOUT = 7.4mA, SHUNT = BIAS, IVIN = 4mA).
Does the LTC3255IDD#PBF require an inductor in its application circuit?
No, the LTC3255IDD#PBF is an inductor-free switched-capacitor DC/DC converter. It uses external flying (CFLY) and output (COUT) capacitors only - no inductor is needed or supported. This eliminates magnetic EMI, reduces board area, and simplifies layout, as confirmed in the LTC3255 datasheet Features section and Typical Application schematic (TA01a).
How does the LTC3255IDD#PBF handle reverse-polarity input connections?
The LTC3255IDD#PBF withstands reverse-polarity input voltages down to –52V on VIN and EN pins without damage. When VIN goes below ground, internal protection diodes limit VOUT to within one diode drop of GND, safeguarding downstream circuitry - a feature explicitly specified in Absolute Maximum Ratings and Applications Information sections of the LTC3255 datasheet.
What is the purpose of the SHUNT pin on the LTC3255IDD#PBF?
The SHUNT pin on the LTC3255IDD#PBF configures the VIN shunt regulator: tying it to BIAS enables shunt operation for current-fed inputs (e.g., 4–20mA loops), while tying it to GND disables shunt mode for standard voltage-fed operation. The pin must never be left floating, as stated in the Pin Functions section of the LTC3255 datasheet.
Can the LTC3255IDD#PBF operate with input voltages below 4V?
No, the LTC3255IDD#PBF has a minimum specified input voltage of 4V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4V violates the guaranteed operating range and may result in loss of regulation, undefined PGOOD behavior, or failure to start - as confirmed by VIN Undervoltage Lockout thresholds (VUVLO_BK = 2.4V–2.7V only when shunt is disabled, but functional operation requires VIN ≥ 4V).
LTC3255IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3255IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255IDD#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 LTC3255IDD#PBF reliable?
The price and inventory of LTC3255IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3255IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255IDD#PBF?
LTC3255IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255IDD#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 LTC3255IDD#PBF?
For technical support, including LTC3255IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255IDD#PBF requirements.
6.How does Aetrix verify that LTC3255IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3255IDD#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 LTC3255IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3255IDD#PBF?
All LTC3255IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255IDD#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 LTC3255IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3255IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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