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Analog Devices Inc. LTC3255IMSE#TRPBF
- Part No.:
- LTC3255IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3255IMSE#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,921
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Product details
Overview
LTC3255IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter designed for current-fed industrial power rails, especially 4mA–20mA current loops. It delivers up to 50mA output current with adjustable regulated output (2.4V–12.5V) from 4V–48V input, features 16µA no-load quiescent current, integrated VIN shunt regulator, and fault protection including reverse-polarity input tolerance (–52V) and short-circuit survival.
For engineers reviewing the LTC3255IMSE#TRPBF datasheet, LTC3255IMSE#TRPBF pinout, LTC3255IMSE#TRPBF application, or LTC3255IMSE#TRPBF equivalent, key selection considerations include shunt-mode current multiplication (e.g., 4mA input → 7.4mA load), automatic 2:1/1:1 charge pump mode switching, PGOOD open-drain status signaling, thermal robustness (150°C max junction), and MSOP-10 package compatibility with industrial control and sensor housekeeping supplies.
Technical Context
The LTC3255IMSE#TRPBF implements a multimode switched-capacitor architecture with automatic 2:1 or 1:1 charge pumping based on VIN, VOUT, and load conditions - 2:1 mode engages when VIN > 2×VOUT to extend output current beyond input supply limits. Its integrated VIN shunt regulator enables operation from high-impedance current sources by clamping VIN to ~2×VOUT + 3.5V, allowing continuous 7.4mA output from a 4mA loop.
Burst Mode® regulation maintains 16µA quiescent current at no load by gating charge transfer bursts only as needed to sustain FB = 1.200V ±24mV. Protection includes overtemperature shutdown (175°C trip), output short-circuit current limiting (120mA), and reverse-polarity input survivability without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 48V - supports wide industrial input rails and legacy 24V/48V systems without pre-regulation. |
| VOUT Range | 2.4V to 12.5V adjustable via FB resistor divider - enables single part to serve multiple rail requirements (e.g., 3.3V, 5V, 12V). |
| Max Output Current | 50mA (shunt disabled) or 7.4mA (shunt enabled, 4mA input) - defines usable load capacity in voltage-fed vs. current-fed configurations. |
| IQ (No Load) | 16µA in Burst Mode® - minimizes standby power in always-on loop-powered sensors and transmitters. |
| Input Fault Tolerance | –52V to +60V - survives wiring errors, inductive kickback, and reverse battery connection without damage. |
| Thermal Limit | 150°C max operating junction temperature - validated for extended use in enclosed industrial enclosures. |
| Oscillator Frequency | 500kHz fixed - enables compact flying capacitor (≥0.4µF) and low-noise operation without EMI-sensitive inductors. |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), thermally enhanced with exposed GND pad (Pin 11). 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 | Internal switch node for charge transfer; must not be externally driven - connects to one terminal of ceramic flying cap (CFLY). |
| VOUT (Pin 2) | Regulated output voltage | Delivers final stepped-down DC output; requires ≥1µF low-ESR ceramic bypass to GND for stability and ripple control. |
| FB (Pin 3) | Feedback reference input | Servo point for regulation at 1.200V ±24mV; connected to resistor divider between VOUT and GND to set output voltage. |
| SHUNT (Pin 4) | Shunt regulator enable/disable | Connect to BIAS to activate VIN shunt (for current-loop operation); connect to GND to disable shunt (voltage-fed mode). |
| PGOOD (Pin 5) | Open-drain power-good indicator | High-impedance when VOUT ≥94% of target; sinks current when <90% - used for system sequencing or fault detection. |
| EN (Pin 6) | Enable logic input | Active-high (≥1.4V) enables conversion; ≤0.4V disables device and reduces IIN to 3µA - allows remote on/off control. |
| BIAS (Pin 7) | Internal bias supply decoupling | Must connect ≥0.1µF ceramic capacitor (10V rating) to GND - stabilizes internal reference and oscillator. |
| GND (Pins 8 & 11) | Power and signal ground | Pins 8 and 11 (exposed pad) are internally tied - exposed pad must be soldered to large PCB ground plane for thermal management. |
| C– (Pin 9) | Flying capacitor negative node | Second terminal of CFLY; switches between VIN and GND during charge/discharge phases - no external drive allowed. |
| VIN (Pin 10) | Main input supply | Accepts 4V–48V; requires ≥1µF low-ESR ceramic bypass to GND near pin - critical for noise immunity and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-based step-down conversion | Eliminates magnetic components - saves board space, avoids inductor EMI, simplifies layout for compact sensor nodes. |
| Current multiplication in shunt mode | Enables 7.4mA continuous output from 4mA input - extends usable load current in 4–20mA loop-powered devices. |
| Automatic 2:1 / 1:1 mode switching | Maintains regulation across full VIN range without manual configuration - 2:1 mode maximizes efficiency when VIN > 2×VOUT. |
| Integrated VIN shunt regulator | Clamps VIN to ~2×VOUT + 3.5V - prevents loop compliance violation in current-fed applications like field transmitters. |
| Burst Mode® regulation | Reduces no-load IQ to 16µA - preserves battery life or minimizes heat in always-on industrial monitoring systems. |
Applications
| 4–20mA Loop-Powered Sensors | Industrial Housekeeping Supplies |
|---|---|
Use Scenario: Powering analog sensor front-ends (e.g., pressure, temperature, flow) directly from a 4–20mA current loop in hazardous or space-constrained locations. IC Role / Device Role / Timing Role: Voltage regulator and current multiplier - converts loop current into stable, higher-current DC rail while respecting loop compliance voltage limits. Use Value: Enables self-powered smart sensors without auxiliary supply; supports 7.4mA load from 4mA input, sufficient for op-amps, ADCs, and microcontrollers. | Use Scenario: Generating auxiliary bias rails (e.g., 3.3V, 5V) for PLC I/O modules, motor drives, or SCADA RTUs where main 24V rail is noisy or unregulated. IC Role / Device Role / Timing Role: Compact, inductor-free step-down converter - replaces linear regulators or buck converters in space-limited control boards. Use Value: Delivers up to 50mA at >80% efficiency (VIN=12V→5V), with 16µA quiescent current reducing standby losses in distributed systems. |
| Factory Automation Transmitters | Robust Field Instrumentation |
Use Scenario: Supplying isolated signal conditioning circuitry in 2-wire HART-enabled transmitters where loop power must remain intact under all operating conditions. IC Role / Device Role / Timing Role: Fault-tolerant power manager - integrates shunt regulation, reverse-polarity protection, and short-circuit survival for mission-critical field devices. Use Value: Survives –52V reverse input and indefinite output shorts; eliminates need for external TVS diodes or series FETs in harsh plant environments. | Use Scenario: Powering microcontroller-based diagnostic subsystems in explosion-proof enclosures where thermal headroom and reliability are paramount. IC Role / Device Role / Timing Role: Thermally optimized DC/DC converter - uses exposed-pad MSOP package and 150°C junction rating for sustained operation in high-ambient-temperature cabinets. Use Value: Maintains regulation up to 125°C ambient (with proper PCB copper), enabling deployment in hot industrial zones without derating or forced cooling. |
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#TRPBF | Wider input (4.5V–32V), dual output (±VOUT), lower max IOUT (30mA per rail), no VIN shunt regulator | Designed for bipolar analog signal chains (e.g., precision ADC drivers), not current-loop power conversion | Select only if dual-rail or ultra-low-noise ±VOUT is required; lacks shunt mode for 4–20mA loops. |
| MAX17521ATP+T | Inductor-based synchronous buck (4.5V–60V), higher IOUT (200mA), no current multiplication, requires external inductor | Optimized for high-current, high-efficiency point-of-load regulation - not suitable for current-fed inputs | Choose when >50mA load or >90% efficiency at high load is mandatory; incompatible with shunt-mode operation. |
Compared with LTC3255IMSE#TRPBF, LTC3265EMSE#TRPBF offers bipolar outputs but cannot replace its current-loop shunt functionality, while MAX17521ATP+T delivers higher current using magnetics but requires redesign for inductor placement and lacks reverse-polarity tolerance.
Availability
LTC3255IMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation, and sensor housekeeping supplies requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 125°C.
Supply support for LTC3255IMSE#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for industrial, automotive, and communications markets.
The LTC3255IMSE#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, engineered specifically for rugged, inductor-free DC/DC conversion in current-loop and high-reliability industrial environments.
FAQ
What is the maximum output current capability of the LTC3255IMSE#TRPBF in shunt mode?
The LTC3255IMSE#TRPBF delivers up to 7.4mA DC output current when the SHUNT pin is connected to BIAS and powered from a 4mA input source - this current multiplication is enabled by the integrated VIN shunt regulator and locked 2:1 charge pump operation. The device sustains this output continuously under specified thermal conditions and with adequate VIN compliance (≥2×VOUT + 3.5V).
Does the LTC3255IMSE#TRPBF require an external inductor?
No, the LTC3255IMSE#TRPBF is a capacitor-based switched-mode converter and requires no inductor. It uses two external ceramic capacitors - a flying capacitor (CFLY, ≥0.4µF) between C+ and C– pins, and an output capacitor (COUT, ≥1µF) between VOUT and GND - to achieve step-down regulation. This eliminates magnetic components, EMI concerns, and board area typically consumed by inductors.
How does the PGOOD pin function on the LTC3255IMSE#TRPBF?
The PGOOD pin on the LTC3255IMSE#TRPBF is an open-drain output that goes high-impedance when the FB voltage reaches ≥94% of the target regulation voltage, indicating valid output. It pulls low when FB falls below 90% or during shutdown/UVLO. A pull-up resistor (e.g., to VOUT) is required to generate a logic-high signal; adding an RC filter to PGOOD enables programmable power-on reset timing for downstream circuitry.
Can the LTC3255IMSE#TRPBF operate with reverse-polarity input voltage?
Yes, the LTC3255IMSE#TRPBF withstands reverse-polarity input down to –52V on the VIN pin without damage. Internal protection circuitry prevents VOUT from dropping more than a diode drop below GND, safeguarding downstream loads. This eliminates the need for external reverse-polarity protection diodes in battery-backed or field-wiring applications where polarity errors may occur.
What is the purpose of the SHUNT pin on the LTC3255IMSE#TRPBF?
The SHUNT pin on the LTC3255IMSE#TRPBF configures the VIN shunt regulator: connecting it to BIAS enables shunt operation for current-fed inputs (e.g., 4–20mA loops), while connecting it to GND disables shunt mode for standard voltage-fed operation. Floating the pin is prohibited - incorrect connection causes undefined behavior or failure to regulate. Shunt mode locks the converter in 2:1 charge pump operation and enables current multiplication.
LTC3255IMSE#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
LTC3255IMSE#TRPBF FAQ
1.How can I place an order for LTC3255IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255IMSE#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 LTC3255IMSE#TRPBF reliable?
The price and inventory of LTC3255IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255IMSE#TRPBF?
LTC3255IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255IMSE#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 LTC3255IMSE#TRPBF?
For technical support, including LTC3255IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3255IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255IMSE#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 LTC3255IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255IMSE#TRPBF?
All LTC3255IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255IMSE#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 LTC3255IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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