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Analog Devices Inc. LTC3255MPMSE#TRPBF
- Part No.:
- LTC3255MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3255MPMSE#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
LTC3255MPMSE#TRPBF from Analog Devices (formerly Linear Technology) is a thermally rugged, wide-input switched-capacitor step-down DC/DC converter optimized for 4mA–20mA current loop powered systems. It delivers up to 7.4mA output current from a 4mA input in shunt mode, regulates adjustable output voltage from 2.4V to 12.5V across 4V–48V input, and features integrated VIN shunt regulation, Burst Mode® operation (16µA IQ), and reverse-polarity input protection - enabling robust housekeeping power in industrial sensor transmitters.
For engineers reviewing the LTC3255MPMSE#TRPBF datasheet, LTC3255MPMSE#TRPBF pinout, LTC3255MPMSE#TRPBF application, or LTC3255MPMSE#TRPBF equivalent, key selection criteria include its fault-protected 50mA charge pump capability, automatic 2:1/1:1 mode switching, PGOOD open-drain output, –55°C to 150°C extended temperature rating, and MSOP-10 package with exposed thermal pad.
Technical Context
The LTC3255MPMSE#TRPBF implements a multimode switched-capacitor architecture with automatic 2:1 or 1:1 charge pumping based on VIN, VOUT, and load conditions. Its internal shunt regulator-enabled by connecting SHUNT to BIAS-allows stable operation from high-impedance current sources while maintaining VIN compliance within 2·VOUT + 3.5V (for VOUT ≤ 5.5V).
Burst Mode® regulation controls charge transfer via FB feedback (1.200V ±2.4mV), achieving 16µA quiescent current at no load. Safety circuitry includes overtemperature shutdown (175°C trip), short-circuit current limiting (120mA), and reverse-polarity tolerance (–52V to 60V on VIN/EN), all validated across its –55°C to 150°C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 48V - supports direct connection to industrial 24V rails, battery stacks, and loop-powered sensors without external pre-regulation. |
| VOUT Range | 2.4V to 12.5V adjustable - set via external resistor divider on FB pin; enables single part to serve multiple rail requirements (e.g., 3.3V, 5V, 12V). |
| Max Output Current | 50mA (shunt disabled) / 7.4mA (shunt enabled, 4mA input) - provides current multiplication for 4–20mA loop applications where input current is strictly limited. |
| Quiescent Current | 16µA at no load - minimizes standby power draw in always-on industrial monitoring nodes. |
| Operating Temp | –55°C to 150°C junction - qualified for harsh environments including motor control enclosures and downhole instrumentation. |
| Protection Features | Reverse-polarity input (–52V), output short-circuit, overtemperature (175°C shutdown), and undervoltage lockout - eliminates need for external protection components. |
| Oscillator Freq | 500kHz fixed - enables compact flying capacitor (≥0.4µF ceramic) and low-noise, high-efficiency operation without EMI-sensitive inductors. |
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 - critical for 2:1 charge transfer phase timing. |
| VOUT (Pin 2) | Regulated output voltage | Delivers final regulated supply; requires ≥1µF low-ESR ceramic output capacitor to limit ripple and support transient loads. |
| FB (Pin 3) | Feedback reference input | Servo point for regulation loop; connected to resistor divider between VOUT and GND to set output voltage (1.200V target). |
| 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 use as general-purpose charge pump. |
| PGOOD (Pin 5) | Open-drain power-good flag | Signals valid regulation when FB reaches ≥94% of target; 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, reducing VIN current to 3µA. |
| BIAS (Pin 7) | Internal bias supply bypass | Must connect ≥0.1µF ceramic capacitor to GND; stabilizes internal reference and oscillator under dynamic load conditions. |
| GND (Pins 8 & 11) | Ground reference and thermal path | Pins 8 and 11 both connect to internal ground; exposed pad (Pin 11) must be soldered to PCB ground plane for thermal management. |
| C– (Pin 9) | Flying capacitor negative node | Connects to second terminal of flying capacitor; forms charge-transfer path during 1:1 and 2:1 modes - no external drive allowed. |
| VIN (Pin 10) | Main input supply | Accepts 4V–48V input; requires ≥1µF low-ESR ceramic bypass capacitor to suppress switching noise and maintain stability. |
Key Features
| Feature | Design Value |
|---|---|
| Multimode charge pump (2:1/1:1) | Automatically selects optimal conversion ratio to maintain regulation across full VIN–VOUT range - avoids dropout and maximizes efficiency without user intervention. |
| VIN shunt regulator | Enables stable operation from 4–20mA current loops by clamping VIN to ~2·VOUT + 3.5V, allowing continuous 7.4mA output from 4mA input without violating loop compliance. |
| Burst Mode® regulation | Reduces no-load IQ to 16µA by pausing charge transfer during light loads - extends battery life and reduces self-heating in always-on sensor nodes. |
| Fault protection suite | Integrated reverse-polarity tolerance (–52V), short-circuit current limit (120mA), and overtemperature shutdown (175°C) eliminate need for discrete protection circuitry in field-deployed equipment. |
| Power Good (PGOOD) output | Open-drain status signal confirms regulation validity (FB ≥94% of target); simplifies system power sequencing and fault detection in PLC and SCADA backplanes. |
Applications
| Industrial 4–20mA Sensor Transmitter | Factory Automation Housekeeping Supply |
|---|---|
Use Scenario: Powering analog front-end, ADC, microcontroller, and HART modem in a loop-powered pressure transmitter. IC Role / Device Role / Timing Role: Primary housekeeping regulator converting 4–20mA loop current into stable 3.3V/5V rail while maintaining <24V loop compliance. Use Value: Enables 7.4mA output from 4mA input using shunt mode, eliminating need for auxiliary power or inefficient linear regulators - preserves loop accuracy and headroom. | Use Scenario: Providing clean, regulated 5V supply to I/O conditioners, isolation amplifiers, and digital logic in modular PLC I/O modules. IC Role / Device Role / Timing Role: Compact, inductor-free DC/DC converter delivering fault-tolerant 50mA output from 24V factory bus. Use Value: Replaces bulky buck converters or lossy LDOs; withstands reverse polarity and short circuits - improves uptime in noisy industrial environments. |
| SCADA Remote Terminal Unit (RTU) | Harsh-Environment Sensor Node |
Use Scenario: Generating 12V bias for analog signal conditioning and 3.3V for ARM Cortex-M MCU in solar-powered RTUs deployed in remote substations. IC Role / Device Role / Timing Role: Wide-input step-down regulator supporting variable PV input (12–48V) and battery backup, with PGOOD signaling for system health monitoring. Use Value: Maintains regulation across wide VIN range using automatic 2:1/1:1 mode switching - ensures reliable operation despite fluctuating solar input and aging batteries. | Use Scenario: Powering MEMS accelerometers and wireless transceivers in oil & gas downhole tools exposed to >125°C ambient temperatures. IC Role / Device Role / Timing Role: High-reliability, extended-temperature DC/DC converter delivering 3.3V from 28V vehicle/bus supply in extreme thermal conditions. Use Value: Qualified for –55°C to 150°C operation with thermal pad soldering - sustains functionality where standard ICs fail, reducing field failure rates. |
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 |
|---|---|---|---|
| LTC3255MPDD#TRPBF | Same core functionality and specs, but in 3mm × 3mm 10-lead DFN package (θJA = 43°C/W vs. 40°C/W); no exposed pad pin numbering difference. | Better board-area efficiency and slightly higher thermal resistance; preferred where space is constrained but thermal margin allows. | Select LTC3255MPDD#TRPBF when footprint size is prioritized over maximum thermal performance in compact sensor modules. |
| LTC3255HMSE#TRPBF | Identical MSOP-10 package and pinout, but rated for –40°C to 150°C (vs. –55°C to 150°C); lower minimum temperature specification. | Not suitable for cryogenic or aerospace cold-start scenarios requiring –55°C operation; otherwise functionally interchangeable. | Choose LTC3255HMSE#TRPBF only if –55°C operation is unnecessary and cost optimization is required - same thermal design applies. |
Compared with LTC3255MPDD#TRPBF, the LTC3255MPMSE#TRPBF offers superior thermal performance (40°C/W vs. 43°C/W) and extended low-temperature capability (–55°C), making it preferable for high-power-density or ultra-wide-temperature industrial deployments; versus LTC3255HMSE#TRPBF, it adds guaranteed –55°C startup and operation - critical for outdoor metering and transportation applications.
Availability
LTC3255MPMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and sensor transmitter applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3255MPMSE#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 support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3255 belongs to Linear's precision switched-capacitor DC/DC converter family, designed specifically for fault-tolerant, inductor-free power conversion in industrial process control, current-loop instrumentation, and harsh-environment sensing.
FAQ
What is the minimum input voltage required for LTC3255MPMSE#TRPBF to regulate a 3.3V output?
The LTC3255MPMSE#TRPBF requires VIN ≥ 2·VOUT + 3.5V (≈10.1V) when operating in shunt mode for 3.3V output, per Figure 2 in the datasheet. In non-shunt mode, regulation begins at VIN ≥ 4V, but 2:1 mode requires VIN > 2·VOUT (6.6V) for optimal efficiency. Always verify compliance margin in your specific layout and load condition.
How does the LTC3255MPMSE#TRPBF achieve current multiplication in 4–20mA loop applications?
The LTC3255MPMSE#TRPBF achieves current multiplication by enabling its VIN shunt regulator (via SHUNT-to-BIAS connection), which locks the charge pump into 2:1 mode. This allows a 4mA input current to sustain a continuous 7.4mA output load - effectively doubling available current while maintaining loop compliance below 24V, as confirmed in the Typical Application and Electrical Characteristics tables.
Can LTC3255MPMSE#TRPBF operate without an external flying capacitor?
No. The LTC3255MPMSE#TRPBF requires an external ceramic flying capacitor (CFLY) connected between C+ and C– pins to perform charge transfer. The datasheet specifies ≥0.4µF capacitance over temperature and bias; omitting CFLY prevents all regulation and may damage the IC due to uncontrolled internal switching node voltages.
What is the purpose of the exposed thermal pad (Pin 11) on the LTC3255MPMSE#TRPBF MSOP package?
The exposed thermal pad (Pin 11) on the LTC3255MPMSE#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 40°C/W. Failure to do so degrades thermal performance significantly - potentially exceeding 150°C junction temperature even at moderate loads - and violates JEDEC JESD51-5 thermal measurement standards.
Does LTC3255MPMSE#TRPBF support adjustable output voltage, and how is it configured?
Yes. The LTC3255MPMSE#TRPBF supports adjustable output voltage from 2.4V to 12.5V via an external resistor divider on the FB pin. Using RA and RB resistors between VOUT and GND, set VOUT = 1.2V × (1 + RA/RB). Select RB between 20kΩ and 2MΩ; higher RB values reduce no-load current but increase sensitivity to stray capacitance on the FB node.
LTC3255MPMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3255MPMSE#TRPBF FAQ
1.How can I place an order for LTC3255MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255MPMSE#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 LTC3255MPMSE#TRPBF reliable?
The price and inventory of LTC3255MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255MPMSE#TRPBF?
LTC3255MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255MPMSE#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 LTC3255MPMSE#TRPBF?
For technical support, including LTC3255MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3255MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255MPMSE#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 LTC3255MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255MPMSE#TRPBF?
All LTC3255MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255MPMSE#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 LTC3255MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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