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Analog Devices Inc. LTC3255HMSE#TRPBF
- Part No.:
- LTC3255HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3255HMSE#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,884
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Product details
Overview
LTC3255HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a thermally enhanced 10-lead MSOP switched-capacitor step-down DC/DC converter designed for current-fed industrial power rails. It accepts 4V–48V input, delivers adjustable 2.4V–12.5V output, supports up to 50mA continuous output current, achieves 16µA quiescent current in Burst Mode®, and integrates VIN shunt regulation for 4mA–20mA current loop applications.
For engineers reviewing the LTC3255HMSE#TRPBF datasheet, LTC3255HMSE#TRPBF pinout, LTC3255HMSE#TRPBF application, or LTC3255HMSE#TRPBF equivalent, key selection considerations include its multimode charge pump (2:1/1:1), fault protection (–52V to 60V reverse-polarity input, short-circuit, overtemperature), PGOOD output, and thermal performance at 150°C max junction temperature.
Technical Context
The LTC3255HMSE#TRPBF implements a fractional switched-capacitor architecture with automatic mode switching between 2:1 and 1:1 conversion ratios 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 locking the pump into 2:1 mode to multiply available current (e.g., 4mA input → 7.4mA output).
Burst Mode® regulation maintains tight output voltage control (FB = 1.200V ±2.4mV) across wide input and load ranges, while integrated protections-including current limiting (120mA typ), thermal shutdown (~175°C), and reverse-polarity tolerance-ensure robustness in harsh industrial environments.
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 |
| Output Voltage Range | 2.4V to 12.5V adjustable via external resistor divider - enables flexible biasing of sensors, ADCs, and microcontrollers |
| Max Output Current | 50mA - sufficient for housekeeping power in PLC I/O modules and field transmitters |
| Quiescent Current | 16µA at no load - extends battery life in low-power sensor nodes and loop-powered devices |
| Operating Junction Temp | –40°C to +150°C - qualified for extended-temperature industrial control and factory automation |
| Oscillator Frequency | 500kHz - enables compact capacitor sizing and low EMI without inductors |
| PGOOD Threshold | 94% of regulated VOUT (typ) - provides reliable power sequencing signal for downstream logic |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), thermally enhanced with exposed GND pad (Pin 11) requiring solder connection to PCB ground plane. 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 |
| VOUT (Pin 2) | Regulated output voltage | Delivers final stepped-down DC output; bypass with ≥1µF low-ESR ceramic capacitor |
| FB (Pin 3) | Feedback reference input | Servo point for regulation; connected to resistor divider to set VOUT = 1.2V × (1 + RA/RB) |
| SHUNT (Pin 4) | Shunt regulator enable/disable | Connect to BIAS to enable VIN shunt for current-loop operation; connect to GND to disable |
| PGOOD (Pin 5) | Open-drain power-good indicator | 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 device; logic-low (<0.4V) shuts down with 3µA shutdown current |
| BIAS (Pin 7) | Internal bias supply decoupling | Must connect ≥0.1µF ceramic capacitor (≥10V rating) to GND for stable internal operation |
| GND (Pins 8 & 11) | Ground reference and thermal path | Pin 11 is exposed pad - mandatory solder connection to PCB ground plane for thermal and electrical integrity |
| C– (Pin 9) | Flying capacitor negative node | Connects to other terminal of flying capacitor; must not be driven externally |
| VIN (Pin 10) | Main input supply | Accepts 4V–48V; bypass with ≥1µF low-ESR ceramic capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Multimode charge pump | Automatically switches between 2:1 and 1:1 ratios to maintain regulation across full VIN/VOUT range |
| VIN shunt regulator | Enables direct operation from 4mA–20mA current loops without external shunt resistors |
| Burst Mode® operation | Reduces no-load input current to 16µA while maintaining ±1.2% output regulation accuracy |
| Fault protection suite | Withstands –52V to +60V reverse-polarity input, survives indefinite output short-circuit, includes overtemperature shutdown |
| Power Good (PGOOD) output | Provides system-level power sequencing and monitoring capability with programmable threshold |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Housekeeping Supply |
|---|---|
Use Scenario: Powers analog front-end circuitry (e.g., RTD interface, signal conditioning) in a 2-wire loop-powered transmitter where VIN is derived from a 4–20mA current source. IC Role / Device Role / Timing Role: Acts as current-multiplying voltage regulator, converting 4mA loop current into 7.4mA at 3.3V while maintaining <3.5V compliance overhead. Use Value: Eliminates need for external shunt resistor and linear regulator, reducing board space and thermal load in confined transmitter housings. | Use Scenario: Supplies clean, regulated bias to MEMS accelerometers, pressure sensors, and analog signal chains in factory automation equipment operating from 24V DC rails. IC Role / Device Role / Timing Role: Provides isolated, low-noise 5V or 3.3V housekeeping rail with minimal external components and no magnetic fields from inductors. Use Value: Enables compact, EMI-free power design in noise-sensitive measurement subsystems with guaranteed 50mA delivery up to 125°C ambient. |
| SCADA Remote Terminal Unit (RTU) | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Generates auxiliary 5V rail for microcontroller, communication ICs (RS-485, CAN), and digital isolators in outdoor-mounted RTUs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Serves as primary step-down regulator with extended temperature qualification (–40°C to +150°C) and reverse-polarity input resilience. Use Value: Ensures uninterrupted operation during brownouts, polarity reversals, or lightning-induced transients common in remote utility infrastructure. | Use Scenario: Delivers stable 3.3V or 5V supply to FPGA configuration memory, ADC drivers, and optocoupler interfaces in modular PLC backplanes. IC Role / Device Role / Timing Role: Functions as fault-tolerant, inductor-free DC/DC converter with built-in current limit and thermal protection for high-reliability control systems. Use Value: Reduces bill-of-materials count versus buck converters while meeting IEC 61000-4 immunity requirements due to absence of magnetic components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3255HDD#TRPBF | Same functional spec, but in 3mm × 3mm 10-lead DFN package with θJA = 43°C/W; no exposed pad on top surface | Better suited for space-constrained layouts where MSOP footprint is unavailable; slightly higher thermal resistance | Select when board area is limited and thermal margin allows for higher θJA; verify PCB copper pour for DFN thermal relief |
| LTC3255IMSE#TRPBF | Identical MSOP package and pinout, but rated for –40°C to +125°C junction temperature (vs. +150°C for LTC3255HMSE#TRPBF) | Appropriate for commercial/industrial environments without extreme thermal stress; lower cost tier | Choose for cost-sensitive designs where ambient temperature remains below 100°C and full H-grade thermal margin is unnecessary |
Compared with LTC3255HDD#TRPBF and LTC3255IMSE#TRPBF, the LTC3255HMSE#TRPBF uniquely combines MSOP mechanical compatibility with 150°C junction rating and optimized thermal resistance (θJA = 40°C/W), making it the only option qualified for sustained operation in high-ambient industrial enclosures.
Availability
LTC3255HMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and 4–20mA current loop applications requiring stable component supply, extended temperature operation, and inductor-free power conversion.
Supply support for LTC3255HMSE#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 power management semiconductors.
The LTC3255 product line was engineered specifically for ruggedized industrial power conversion, emphasizing fault resilience, current-loop compatibility, and extended temperature reliability without magnetic components.
FAQ
What is the maximum junction temperature rating for the LTC3255HMSE#TRPBF?
The LTC3255HMSE#TRPBF is specified for operation up to 150°C junction temperature. This H-grade qualification enables use in high-ambient industrial environments such as motor control cabinets and outdoor SCADA enclosures. Thermal derating applies above 125°C, and the device incorporates overtemperature protection that activates near 175°C to prevent permanent damage. The MSOP package's θJA of 40°C/W requires adequate PCB copper pour and exposed pad soldering to sustain this rating under full load.
How does the LTC3255HMSE#TRPBF achieve current multiplication in 4–20mA loop applications?
The LTC3255HMSE#TRPBF achieves current multiplication by enabling its integrated VIN shunt regulator-via connection of the SHUNT pin to BIAS-and locking the charge pump into forced 2:1 mode. In this configuration, a 4mA input current can sustain a 7.4mA load at 3.3V, effectively doubling available output current while maintaining VIN compliance within typical loop limits (≤24V). This eliminates external shunt resistors and linear regulators, reducing heat generation and board area in loop-powered transmitters.
Can the LTC3255HMSE#TRPBF operate without an inductor?
Yes, the LTC3255HMSE#TRPBF is a fully inductor-free solution. It uses a switched-capacitor (charge pump) topology with external flying and output capacitors instead of magnetic energy storage. This eliminates EMI concerns, reduces board area, avoids inductor saturation issues, and simplifies layout-making it ideal for space-constrained and noise-sensitive industrial applications where traditional buck converters are impractical.
What protection features are integrated into the LTC3255HMSE#TRPBF?
The LTC3255HMSE#TRPBF integrates reverse-polarity input protection (–52V to +60V), indefinite output short-circuit survival, 120mA output current limiting, and overtemperature shutdown (~175°C). These features ensure robust operation in harsh industrial settings where wiring errors, lightning surges, or thermal overload may occur. Unlike many DC/DC converters, it requires no external protection components to meet IEC 61000-4 immunity requirements in typical installations.
Is the LTC3255HMSE#TRPBF pin-compatible with other variants in the LTC3255 family?
Yes, the LTC3255HMSE#TRPBF shares identical pinout and footprint with all MSOP-packaged LTC3255 variants (e.g., LTC3255EMSE#TRPBF, LTC3255IMSE#TRPBF, LTC3255MPMSE#TRPBF). This allows direct substitution within the same package family for temperature grade upgrades or downgrades without PCB redesign. However, DFN-package variants (e.g., LTC3255HDD#TRPBF) have different pin assignments and physical dimensions and are not mechanically or electrically interchangeable.
LTC3255HMSE#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
LTC3255HMSE#TRPBF FAQ
1.How can I place an order for LTC3255HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255HMSE#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 LTC3255HMSE#TRPBF reliable?
The price and inventory of LTC3255HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255HMSE#TRPBF?
LTC3255HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255HMSE#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 LTC3255HMSE#TRPBF?
For technical support, including LTC3255HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3255HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255HMSE#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 LTC3255HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255HMSE#TRPBF?
All LTC3255HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255HMSE#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 LTC3255HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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