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Analog Devices Inc. LTC3255HMSE#PBF
- Part No.:
- LTC3255HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3255HMSE#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,981
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Product details
Overview
LTC3255HMSE#PBF 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 powering. It delivers up to 50mA output current with adjustable regulated output (2.4V–12.5V), 16µA no-load quiescent current, and integrated VIN shunt regulation - enabling 7.4mA load supply from a 4mA input in industrial sensor and SCADA systems.
For engineers reviewing the LTC3255HMSE#PBF datasheet, LTC3255HMSE#PBF pinout, LTC3255HMSE#PBF application, or LTC3255HMSE#PBF equivalent, key selection considerations include its dual-mode (2:1/1:1) charge pump operation, reverse-polarity input tolerance (–52V), fault-protected 50mA output, PGOOD indicator, and –40°C to 150°C junction temperature rating in the 10-lead MSOP package.
Technical Context
The LTC3255HMSE#PBF implements a multimode switched-capacitor architecture with automatic 2:1/1:1 mode switching when SHUNT = GND, and forced 2:1 mode with SHUNT = BIAS for current-loop applications. Its internal 1.2V feedback reference (±2.4mV over temp) enables precise output voltage setting via external resistor divider, while Burst Mode® control maintains regulation at ultra-low 16µA VIN quiescent current under no load.
Fault protection includes input reverse-polarity tolerance (–52V), output short-circuit immunity, overtemperature shutdown (175°C trip), and integrated current limiting (120mA). The device features an open-drain PGOOD output asserting high impedance when FB reaches ≥94% of regulation voltage, and supports VIN compliance down to 2×VOUT + 3.5V in shunt-enabled configurations.
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 - set via external resistor divider referenced to 1.200V FB pin. |
| Max Output Current | 50mA - sustained delivery without thermal derating at TJ ≤ 150°C in MSE package. |
| VIN Quiescent Current | 16µA at no load - enables ultra-low-power operation in battery-backed or energy-harvested nodes. |
| Operating Junction Temp | –40°C to 150°C - qualified for harsh environments including factory automation and oil/gas instrumentation. |
| Charge Pump Modes | Auto-switching 2:1 and 1:1 - maximizes efficiency across VIN/VOUT ratios; 2:1 locked when SHUNT = BIAS. |
| Input Fault Protection | –52V to +60V - survives reverse polarity, transients, and wiring errors in field-deployed equipment. |
Pinout & Package
Package: 10-lead plastic MSOP (MSE) with exposed pad (Pin 11) - thermally enhanced for 40°C/W θJA; requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive node | Connects to + terminal of external flying capacitor; must not be externally driven. |
| VOUT (Pin 2) | Regulated output voltage | Delivers up to 50mA; requires ≥1µF low-ESR ceramic output capacitor. |
| FB (Pin 3) | Feedback reference input | Servo point for 1.200V ±2.4mV regulation; connects to resistor divider between VOUT and GND. |
| SHUNT (Pin 4) | Shunt regulator enable/disable | Connect to BIAS to enable VIN shunt for 4–20mA loops; connect to GND to disable. |
| PGOOD (Pin 5) | Open-drain power-good flag | High-impedance when VOUT ≥94% of target; requires external pull-up for logic-level signaling. |
| EN (Pin 6) | Enable control input | Logic-high (>1.4V) enables operation; logic-low (<0.4V) shuts down IC to 3µA VIN current. |
| BIAS (Pin 7) | Internal bias supply bypass | Must connect ≥0.1µF ceramic capacitor (≥10V rating) to GND for stable internal regulation. |
| GND (Pins 8 & 11) | Power and signal ground | Pin 8 = signal GND; Pin 11 = exposed thermal pad - both must connect to PCB ground plane. |
| C– (Pin 9) | Flying capacitor negative node | Connects to – terminal of external flying capacitor; must not be externally driven. |
| VIN (Pin 10) | Main input supply | Accepts 4–48V; requires ≥1µF low-ESR ceramic bypass capacitor to GND. |
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. |
| VIN shunt regulator for current loops | Enables direct use with 4–20mA sources by regulating VIN to ~2×VOUT + 3.5V, allowing 7.4mA output from 4mA input. |
| Burst Mode® regulation | Maintains output regulation at light loads with only 16µA VIN quiescent current - critical for always-on sensor nodes. |
| Fault-tolerant design | Withstands –52V reverse input, indefinite output shorts, and 150°C junction operation - suitable for unattended industrial sites. |
| Integrated PGOOD monitoring | Provides system-level power sequencing and fault detection without external comparators or supervision ICs. |
Applications
| Industrial 4–20mA Sensor Transmitters | SCADA Remote Terminal Units (RTUs) |
|---|---|
Use Scenario: Powering analog sensor front-ends and ADCs in loop-powered field instruments with strict <12V compliance. IC Role / Device Role / Timing Role: Primary housekeeping regulator converting 4–20mA loop current into stable 3.3V/5V for signal conditioning and microcontroller operation. Use Value: Enables 7.4mA load current from 4mA source using shunt-regulated 2:1 charge pump mode - preserves loop compliance while boosting available power. |
Use Scenario: Providing isolated auxiliary power in distributed control cabinets where input voltage varies widely (12–48V DC). IC Role / Device Role / Timing Role: Compact, inductor-free DC/DC converter delivering 5V/50mA for communication interfaces (RS-485, CAN) and real-time clocks. Use Value: Delivers full 50mA output across 4–48V input range with automatic 2:1→1:1 mode switching - eliminates need for multiple discrete regulators. |
| Factory Automation I/O Modules | Oil & Gas Downhole Monitoring Systems |
Use Scenario: Generating local 3.3V rail for digital isolators and FPGA configuration in DIN-rail mounted PLC I/O cards. IC Role / Device Role / Timing Role: High-reliability, thermally robust step-down regulator operating continuously at 125°C ambient with minimal heatsinking. Use Value: Rated for –40°C to 150°C junction operation and 40°C/W thermal resistance - sustains regulation without derating in convection-cooled enclosures. |
Use Scenario: Powering pressure/temperature sensors and telemetry circuitry in high-temperature wellhead electronics. IC Role / Device Role / Timing Role: Fault-protected DC/DC converter surviving reverse polarity, load dumps, and extended thermal stress in sealed housings. Use Value: Withstands –52V to +60V input faults and operates up to 150°C junction - eliminates external TVS and thermal margining components. |
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 |
|---|---|---|---|
| LTC3255HDD#PBF | Same electrical specs but in 3mm × 3mm 10-lead DFN package (θJA = 43°C/W); no exposed pad on bottom surface. | Better thermal performance in space-constrained layouts with high copper pour; less effective in low-airflow enclosures than MSOP with soldered pad. | Select when board area is critical and thermal vias can be placed under DFN body - avoid if ambient exceeds 105°C without forced cooling. |
| LTC3255IMSE#PBF | Identical MSOP package and pinout, but rated for –40°C to 125°C junction (vs. 150°C for LTC3255HMSE#PBF); same 40°C/W θJA. | Lower maximum junction temperature limits use in high-ambient or high-power-dissipation scenarios requiring extended thermal headroom. | Select for cost-sensitive industrial designs operating below 125°C ambient; avoid for downhole, furnace, or enclosed transformer applications. |
Compared with LTC3255HDD#PBF and LTC3255IMSE#PBF, the LTC3255HMSE#PBF uniquely combines 150°C junction rating, MSOP thermal pad integration, and identical functionality - making it the only option qualified for continuous operation in >125°C ambient environments without derating.
Availability
LTC3255HMSE#PBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and SCADA systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3255HMSE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear power products, including precision switched-capacitor regulators.
The LTC3255HMSE#PBF belongs to Linear's high-reliability industrial DC/DC converter family, designed specifically for fault-tolerant, inductor-free power in 4–20mA current loops and harsh-environment instrumentation.
FAQ
What is the maximum junction temperature rating for the LTC3255HMSE#PBF?
The LTC3255HMSE#PBF is guaranteed for continuous operation up to 150°C junction temperature, with thermal shutdown activating at approximately 175°C. Its 10-lead MSOP package features an exposed thermal pad (Pin 11) that must be soldered to the PCB ground plane to achieve the specified 40°C/W θJA. This rating enables deployment in high-ambient environments such as enclosed control cabinets and oilfield electronics where passive cooling is limited.
How does the LTC3255HMSE#PBF support 4–20mA current loop applications?
The LTC3255HMSE#PBF supports 4–20mA current loops via its configurable VIN shunt regulator: when SHUNT pin is tied to BIAS, the IC enters forced 2:1 charge pump mode and regulates VIN to ~2×VOUT + 3.5V, allowing it to draw only 4mA from the loop while delivering up to 7.4mA at 3.3V. This preserves loop compliance voltage headroom while boosting available power - a capability confirmed in the datasheet's "Available Output Current vs Input Current" graph (Figure TA01b).
Can the LTC3255HMSE#PBF operate with input voltages below 4V?
No - the LTC3255HMSE#PBF has a hard undervoltage lockout (UVLO) threshold of 2.4V (rising) with shunt disabled and 5.0V (rising) with shunt enabled, per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4V input is outside specification and will cause the device to remain in shutdown or fail to regulate. For sub-4V inputs, alternative solutions such as boost-then-buck architectures or dedicated low-VIN charge pumps are required.
What is the purpose of the PGOOD pin on the LTC3255HMSE#PBF?
The PGOOD pin on the LTC3255HMSE#PBF is an open-drain output that transitions to high-impedance when the FB pin voltage reaches ≥94% of the target regulation voltage, indicating valid output regulation. It remains asserted until VOUT drops below 90% of target or the device enters shutdown/UVLO. A pull-up resistor to VOUT is required for logic-level signaling, enabling system power sequencing, watchdog triggering, or fault logging without external supervision circuitry.
Which external capacitors are mandatory for stable operation of the LTC3255HMSE#PBF?
Four external capacitors are mandatory: (1) ≥1µF low-ESR ceramic at VIN (Pin 10), (2) ≥1µF low-ESR ceramic at VOUT (Pin 2), (3) ≥0.4µF X5R/X7R ceramic flying capacitor between C+ (Pin 1) and C– (Pin 9), and (4) ≥0.1µF ceramic at BIAS (Pin 7). The datasheet explicitly warns against using polarized capacitors (tantalum/aluminum) for C+ or C–, and specifies that COUT ESR must be <0.1Ω to minimize ripple - all requirements validated in the Applications Information section.
LTC3255HMSE#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
LTC3255HMSE#PBF FAQ
1.How can I place an order for LTC3255HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255HMSE#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 LTC3255HMSE#PBF reliable?
The price and inventory of LTC3255HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3255HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255HMSE#PBF?
LTC3255HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255HMSE#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 LTC3255HMSE#PBF?
For technical support, including LTC3255HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255HMSE#PBF requirements.
6.How does Aetrix verify that LTC3255HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3255HMSE#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 LTC3255HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3255HMSE#PBF?
All LTC3255HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255HMSE#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 LTC3255HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3255HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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