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Analog Devices Inc. LTC3255IMSE#PBF
- Part No.:
- LTC3255IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3255IMSE#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,804
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Product details
Overview
LTC3255IMSE#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 a regulated 2.4V–12.5V output from a 4V–48V input, supports up to 50mA continuous output current in standard mode or 7.4mA from a 4mA–20mA current loop with shunt enabled, and achieves 16µA quiescent current in Burst Mode® regulation - ideal for low-power sensor nodes and loop-powered field instruments.
For engineers reviewing the LTC3255IMSE#PBF datasheet, LTC3255IMSE#PBF pinout, LTC3255IMSE#PBF application, or LTC3255IMSE#PBF equivalent, key selection considerations include its multimode charge pump (2:1/1:1), VIN shunt regulator capability for current-loop compatibility, PGOOD open-drain status signal, thermal protection up to 150°C junction, and MSOP-10 package with exposed pad for industrial temperature operation (–40°C to 125°C).
Technical Context
The LTC3255IMSE#PBF implements a fractional switched-capacitor topology with automatic 2:1/1:1 mode switching based on VIN, VOUT, and load conditions - preferring 2:1 when VIN > 2×VOUT to maximize efficiency and output current capability. Its internal shunt regulator, activated by connecting SHUNT to BIAS, enables stable operation from high-impedance current sources like 4mA–20mA loops while maintaining VIN compliance within 2×VOUT + 3.5V.
Regulation is achieved via a Burst Mode® control loop that compares FB voltage (target 1.200V ±2.4%) against an internal reference; charge transfer occurs in discrete packets only when VFB falls below threshold, minimizing no-load power loss. Protection includes reverse-polarity input tolerance (–52V to 60V), short-circuit current limiting (120mA typ), and overtemperature shutdown at ~175°C with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 48V - supports wide industrial supply rails and legacy 24V/48V systems without external pre-regulation. |
| Output Voltage Range | 2.4V to 12.5V adjustable via FB resistor divider - enables flexible rail generation for analog sensors, ADCs, and microcontrollers. |
| Max Output Current | 50mA (shunt disabled) or 7.4mA (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 critical for battery-backed or energy-harvested systems. |
| Oscillator Frequency | 500kHz fixed - determines charge pump switching speed and influences capacitor sizing and ripple performance. |
| Feedback Voltage | 1.200V ±2.4% - sets precision of output regulation; used with external resistors to program VOUT per VOUT = 1.2V × (1 + RA/RB). |
| Power Good Threshold | Rising: 94% of final VOUT (typ); Falling: 90% - provides reliable system power sequencing and fault detection without external comparators. |
| Junction Temp Limit | 150°C max operating; 175°C thermal shutdown - defines thermal design margin for enclosed industrial enclosures or high-ambient environments. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive node | Connects to one terminal of external flying capacitor; must not be driven externally - internal switch node for charge transfer phases. |
| VOUT (Pin 2) | Regulated output voltage | Delivers final stepped-down DC output; requires ≥1µF low-ESR ceramic capacitor to GND for stability and ripple suppression. |
| FB (Pin 3) | Feedback input | Senses divided VOUT to maintain 1.200V reference; leakage <±10nA ensures minimal error in high-value resistor dividers. |
| SHUNT (Pin 4) | Shunt regulator enable/disable | Connect to BIAS to activate VIN shunt for current-loop operation; connect to GND to disable and use as standard step-down charge pump. |
| PGOOD (Pin 5) | Open-drain power status | Signals valid regulation (high-Z) when VFB ≥94% target; sinks current when out-of-regulation or shutdown - requires external pull-up. |
| EN (Pin 6) | Enable logic input | Active-high (VIH ≥1.4V); pulls VIN current to 3µA in shutdown - allows system-level power gating and sequencing. |
| BIAS (Pin 7) | Internal bias supply | Must connect 0.1µF ceramic capacitor to GND; supplies internal circuitry and enables SHUNT function when tied to SHUNT pin. |
| GND (Pins 8 & 11) | Ground reference and thermal path | Pins 8 and 11 (exposed pad) are internally connected GND; exposed 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; shares switching behavior with C+ but inverted phase - forms charge transfer 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 and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Multimode charge pump | Automatically switches between 2:1 (VIN > 2×VOUT) and 1:1 modes to sustain regulation across full input/output range without manual configuration. |
| VIN shunt regulator | Enables direct operation from 4mA–20mA current loops by clamping VIN to ~2×VOUT + 3.5V, eliminating need for external shunt resistors or auxiliary supplies. |
| Burst Mode® regulation | Reduces no-load VIN current to 16µA by pausing charge transfer during light loads - extends battery life and minimizes self-heating in idle states. |
| Fault protection suite | Withstands –52V to 60V reverse-polarity input, survives indefinite VOUT short-circuit, and includes 120mA current limit + overtemperature shutdown for robust field deployment. |
| Power Good indicator | Open-drain PGOOD pin asserts high-impedance state only when VOUT reaches 94% of target - simplifies system power sequencing and eliminates external monitoring ICs. |
| Thermally enhanced MSOP | 10-lead MSOP with exposed GND pad (θJA = 40°C/W) enables reliable operation up to 125°C ambient in space-constrained industrial modules. |
Applications
| Industrial 4–20mA Loop Power | Low-Power Sensor Housekeeping Supply |
|---|---|
Use Scenario: Powering analog front-end circuitry (e.g., RTD transmitters, pressure sensors) directly from a 4–20mA current loop in process automation systems. IC Role / Device Role / Timing Role: Acts as current-to-voltage converter and regulated DC supply generator, using its VIN shunt regulator to maintain loop compliance while delivering stable 3.3V/5V to downstream circuitry. Use Value: Eliminates need for separate loop-powered isolators or auxiliary supplies - reduces BOM count and enables compact, single-board transmitter designs compliant with IEC 61000-4-5 surge standards. | Use Scenario: Providing clean, low-noise bias voltage for MEMS accelerometers, humidity sensors, or thermocouple amplifiers in battery-operated wireless IoT nodes. IC Role / Device Role / Timing Role: Functions as ultra-low-quiescent step-down converter, generating 2.4V–5V rails from a primary 12V or 24V industrial bus while minimizing standby power drain. Use Value: Achieves 16µA no-load current and 80–90% efficiency across 5–50mA loads - extends battery life by months in intermittently active sensor deployments. |
| SCADA Remote Terminal Unit (RTU) Auxiliary Rail | Factory Automation Field Interface Module |
Use Scenario: Generating isolated or non-isolated auxiliary 5V/12V rails inside RTUs deployed in electric substations or pipeline monitoring stations with wide-input unregulated supplies. IC Role / Device Role / Timing Role: Serves as fault-tolerant housekeeping supply, leveraging 48V input support, reverse-polarity protection, and thermal shutdown to survive harsh EMI/noise environments. Use Value: Withstands –52V to 60V transients and operates continuously at 125°C ambient - ensures uptime in outdoor cabinets exposed to solar loading and lightning-induced surges. | Use Scenario: Powering digital isolators, level shifters, and microcontroller peripherals in modular PLC I/O cards where board space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Replaces inefficient linear regulators or bulky inductor-based buck converters in multi-rail power domains requiring 3.3V, 5V, or 12V outputs. Use Value: Delivers 50mA output without inductors - reduces EMI, saves >30mm² PCB area vs. typical buck solutions, and simplifies layout with ceramic-only passive 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 |
|---|---|---|---|
| LTC3265EMSE#PBF | Wider input (4.5V–32V), dual-output (±VOUT), lower max output current (30mA per rail), integrated LDO post-regulator | Targeted at bipolar analog signal chains (e.g., precision ADC drivers), not current-loop powering | Select when dual-rail ±1.8V/±3.3V needed with ultra-low noise; avoid for 4–20mA loop or >50mA single-rail needs. |
| MAX17521ATP+T | Inductor-based synchronous buck (4.5V–60V), higher efficiency at >100mA, larger solution size, no shunt regulator | Optimized for high-current industrial DC/DC conversion where inductors are acceptable | Choose for >75mA loads or where 92%+ efficiency at full load outweighs board space and EMI concerns. |
Compared with LTC3255IMSE#PBF, LTC3265EMSE#PBF adds bipolar output capability but sacrifices current-loop shunt functionality and peak output current, while MAX17521ATP+T offers superior heavy-load efficiency and input range but requires magnetics and lacks native current-loop support - making LTC3255IMSE#PBF uniquely suited for compact, loop-powered, moderate-current industrial supplies.
Availability
LTC3255IMSE#PBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and SCADA systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3255IMSE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3255 belongs to ADI's precision power management product line, engineered specifically for ruggedized industrial power conversion - emphasizing fault resilience, wide input range, current-loop compatibility, and thermal robustness in harsh environments.
FAQ
What is the maximum output current capability of the LTC3255IMSE#PBF in standard operation?
The LTC3255IMSE#PBF delivers up to 50mA of continuous regulated output current when the SHUNT pin is connected to GND (shunt regulator disabled) and input voltage is within specification. This rating assumes proper thermal management via the exposed pad and appropriate external capacitors. At higher ambient temperatures or with inadequate PCB copper, derating may be required to maintain 150°C maximum junction temperature.
How does the LTC3255IMSE#PBF support 4mA–20mA current loop applications?
The LTC3255IMSE#PBF supports 4mA–20mA current loops by enabling its internal VIN shunt regulator - achieved by connecting the SHUNT pin to the BIAS pin. In this mode, the device regulates VIN to approximately 2×VOUT + 3.5V, allowing it to draw controlled current from the loop while delivering up to 7.4mA at 3.3V from a 4mA source. This eliminates external shunt resistors and simplifies loop-powered sensor design.
What package type and thermal characteristics apply to the LTC3255IMSE#PBF?
The LTC3255IMSE#PBF uses a 10-lead plastic MSOP package with an exposed thermal pad (Pin 11 = GND). Its thermal resistance is θJA = 40°C/W when properly mounted on a PCB with the exposed pad soldered to a large ground plane. The device operates from –40°C to +125°C junction temperature and includes overtemperature shutdown at ~175°C to prevent permanent damage during fault conditions.
Can the LTC3255IMSE#PBF operate with input voltages below 4V?
No, the LTC3255IMSE#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 failure to regulate, erratic Burst Mode® behavior, or undefined PGOOD assertion. For sub-4V inputs, alternative solutions such as low-VIN boost converters or LDOs should be evaluated.
What is the role of the PGOOD pin on the LTC3255IMSE#PBF and how should it be used?
PGOOD on the LTC3255IMSE#PBF is an open-drain output that goes high-impedance when VFB reaches ≥94% of the target regulation voltage, signaling valid output. It remains low (pulled to GND internally) during startup, shutdown, UVLO, or undervoltage conditions. A pull-up resistor to VOUT is required; optional RC filtering can delay assertion for sequencing. It replaces external power monitors in systems requiring reliable rail validation.
LTC3255IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3255IMSE#PBF FAQ
1.How can I place an order for LTC3255IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255IMSE#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 LTC3255IMSE#PBF reliable?
The price and inventory of LTC3255IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3255IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255IMSE#PBF?
LTC3255IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255IMSE#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 LTC3255IMSE#PBF?
For technical support, including LTC3255IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255IMSE#PBF requirements.
6.How does Aetrix verify that LTC3255IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3255IMSE#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 LTC3255IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3255IMSE#PBF?
All LTC3255IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255IMSE#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 LTC3255IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3255IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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