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Analog Devices Inc. LTC3255MPDD#TRPBF
- Part No.:
- LTC3255MPDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3255MPDD#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
LTC3255MPDD#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 power conversion. It delivers up to 7.4mA output from a 4mA input in shunt mode, supports 4V–48V input and 2.4V–12.5V adjustable output, and features integrated VIN shunt regulation, Burst Mode® operation (16µA IQ), and fault protection including reverse-polarity tolerance (–52V) and short-circuit immunity.
For engineers reviewing the LTC3255MPDD#TRPBF datasheet, LTC3255MPDD#TRPBF pinout, LTC3255MPDD#TRPBF application, or LTC3255MPDD#TRPBF equivalent, this page provides verified technical context for current-loop housekeeping supplies, industrial sensor powering, and space-constrained 4–20mA loop designs requiring high reliability across –55°C to 150°C junction temperature.
Technical Context
The LTC3255MPDD#TRPBF implements multimode charge pumping with automatic 2:1/1:1 ratio switching when SHUNT = GND, enabling efficient regulation across wide VIN–VOUT differentials. Its internal 1.2V feedback reference and programmable resistor divider allow precise output voltage setting independent of load or input variation.
When SHUNT = BIAS, the device locks into forced 2:1 mode and activates its VIN shunt regulator-designed specifically for current-fed sources-enabling continuous 7.4mA output from a 4mA loop while maintaining ≤3.5V VIN compliance margin above 2×VOUT. Protection includes overtemperature shutdown (175°C trip), output short-circuit current limiting (120mA), and robust ±52V reverse-polarity tolerance on VIN/EN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 48V - supports direct connection to industrial 24V rails, battery-backed systems, and legacy 48V telecom supplies without external pre-regulation. |
| Output Voltage Range | 2.4V to 12.5V adjustable - set via external resistor divider on FB pin; enables single BOM for multiple rail requirements (e.g., 3.3V, 5V, 12V). |
| Max Output Current | 7.4mA (shunt-enabled) / 50mA (shunt-disabled) - current multiplication capability allows 4mA loop to power 7.4mA loads continuously. |
| Quiescent Current | 16µA at no load in regulation - enables ultra-low-power operation in always-on sensor nodes and loop-powered transmitters. |
| Operating Junction Temp | –55°C to 150°C - rated for extended industrial and aerospace environments; exposed-pad DFN package enhances thermal dissipation. |
| Oscillator Frequency | 500kHz fixed - enables compact flying capacitor (≥0.4µF ceramic) and low-noise, predictable charge transfer timing. |
| PGOOD Threshold | 94% of final regulation voltage - open-drain output signals valid regulation with tight hysteresis for reliable system sequencing. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Thermally enhanced for high-power-density industrial applications; requires soldering of exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive node | Connects to positive terminal of external flying capacitor; must not be driven externally-internal switch only. |
| VOUT (Pin 2) | Regulated output voltage | Delivers final regulated output; bypassed with ≥10µF low-ESR ceramic capacitor for ripple suppression. |
| FB (Pin 3) | Feedback input | Servo point for regulation; connected to resistor divider between VOUT and GND to set output voltage to 1.2V × (1 + RA/RB). |
| SHUNT (Pin 4) | Shunt regulator enable/disable control | Connect to BIAS to enable VIN shunt for current-loop operation; connect to GND to disable shunt and enable auto-switching 2:1/1:1 modes. |
| PGOOD (Pin 5) | Open-drain power-good indicator | Signals regulation status; requires external pull-up to VOUT or another supply; asserts high-impedance when FB ≥ 94% of target. |
| EN (Pin 6) | Enable logic input | Active-high control; logic high (≥1.4V) enables converter; logic low (<0.4V) shuts down all circuitry except bias. |
| BIAS (Pin 7) | Internal bias supply decoupling | Must connect ≥0.1µF ceramic capacitor (10V rating min) 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 PCB ground plane for thermal and electrical integrity. |
| C– (Pin 9) | Flying capacitor negative node | Connects to negative terminal of external flying capacitor; must not be driven externally-internal switch only. |
| VIN (Pin 10) | Main input supply | Accepts 4V–48V input; requires ≥1µF low-ESR ceramic bypass capacitor to GND near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VIN shunt regulator | Enables direct use in 4–20mA current loops by clamping VIN to ~2×VOUT + 3.5V, eliminating need for external shunt transistor or Zener. |
| Multimode charge pump (2:1/1:1) | Automatically selects optimal conversion ratio based on VIN, VOUT, and load-maximizing efficiency across full input range without user intervention. |
| Burst Mode® operation | Reduces quiescent current to 16µA at no load while maintaining tight output regulation-critical for battery-backed or energy-harvested sensors. |
| Fault protection suite | Includes reverse-polarity tolerance (–52V), output short-circuit current limit (120mA), and overtemperature shutdown (175°C trip) for unattended industrial deployment. |
| Thermally enhanced DFN package | 3mm × 3mm 10-lead DFN with exposed GND pad (θJA = 43°C/W) enables reliable operation up to 150°C junction temperature in confined enclosures. |
Applications
| Industrial 4–20mA Loop Powering | Factory Automation Sensor Supply |
|---|---|
Use Scenario: Powering analog sensor transmitters (e.g., pressure, temperature) within a 4–20mA current loop where VIN is current-limited and voltage compliance is constrained. IC Role / Device Role / Timing Role: Acts as current-multiplying housekeeping supply-accepts 4mA input and delivers 7.4mA at 3.3V or 5V to power op-amps, ADCs, and microcontrollers on the sensor board. Use Value: Eliminates need for separate auxiliary supply or inefficient linear regulators; maintains loop compliance under full load while enabling digital functionality on loop-powered devices. | Use Scenario: Providing stable, low-noise bias rails for distributed I/O modules in PLC backplanes or remote terminal units (RTUs) operating from 24V DC field buses. IC Role / Device Role / Timing Role: Functions as compact, inductor-free step-down converter delivering 5V/50mA or 12V/25mA from 24V–48V inputs-replacing bulky buck converters in space-constrained DIN-rail enclosures. Use Value: Reduces board area and EMI emissions versus inductor-based solutions; supports wide input range without derating, simplifying BOM across global 24V/48V installations. |
| SCADA System Housekeeping Supply | Harsh-Environment Sensor Node Power |
Use Scenario: Generating clean, regulated auxiliary power for communication interfaces (RS-485, CAN) and microcontroller subsystems in outdoor SCADA telemetry units exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Serves as primary DC/DC converter with PGOOD signaling for system-level power sequencing and brownout detection in mission-critical infrastructure monitoring. Use Value: Guaranteed operation from –55°C to 150°C junction temperature ensures reliability in desert heat or arctic cold; PGOOD enables safe firmware boot and watchdog reset coordination. | Use Scenario: Powering wireless sensor nodes deployed in oil/gas wellheads, turbine nacelles, or railway trackside cabinets where ambient temperatures exceed 125°C and PCB real estate is minimal. IC Role / Device Role / Timing Role: Provides regulated 3.3V output from a 24V field supply using only ceramic capacitors-no inductors-to avoid magnetic interference and mechanical vibration sensitivity. Use Value: Enables fully passive, maintenance-free operation for >10 years; thermal design leverages exposed-pad DFN to sustain 150°C junction without derating output current. |
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 (50mA total), MSOP package only | Designed for bipolar supply generation (e.g., op-amp rails); lacks VIN shunt regulator and current-loop optimization | Select when dual-rail or negative output required; not suitable for 4–20mA current multiplication. |
| MAX17521ATP+T | Inductor-based buck converter; 4.5V–60V input, 500kHz sync, 100mA output; requires external inductor and compensation | Higher output current and efficiency at medium loads; larger solution size and EMI concerns vs. capacitor-only topology | Choose for higher current (>50mA) or tighter efficiency targets where inductor footprint is acceptable. |
Compared with LTC3265EMSE#PBF and MAX17521ATP+T, the LTC3255MPDD#TRPBF uniquely combines current-loop shunt regulation, ultra-low quiescent current, and inductor-free operation in a thermally rated DFN-making it the only option qualified for direct 4mA–20mA loop powering across –55°C to 150°C.
Availability
LTC3255MPDD#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation sensor powering, and SCADA system housekeeping supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3255MPDD#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 continuity, documentation, and support for the LTC portfolio. Linear pioneered high-performance analog ICs for precision power, signal conditioning, and timing.
The LTC3255 belongs to Linear's switched-capacitor DC/DC converter family, designed specifically for inductor-free, space-constrained, and current-loop–fed applications in industrial, instrumentation, and process control systems.
FAQ
What is the maximum junction temperature rating for the LTC3255MPDD#TRPBF?
The LTC3255MPDD#TRPBF is specified for operation from –55°C to 150°C junction temperature. This extended rating is enabled by its 10-lead DFN package with exposed thermal pad (Pin 11), which must be soldered to a PCB ground plane. Thermal resistance θJA is 43°C/W, so ambient temperature must be limited based on power dissipation to maintain junction temperature ≤150°C-e.g., at 1.2W dissipation, max ambient is 102°C.
How does the LTC3255MPDD#TRPBF achieve current multiplication in 4–20mA loops?
The LTC3255MPDD#TRPBF achieves current multiplication by enabling its VIN shunt regulator (via SHUNT = BIAS), locking the charge pump into 2:1 mode. In this configuration, a 4mA input current can sustain a 7.4mA output load because the device draws additional current from VIN through its internal shunt to maintain regulation-effectively converting excess loop voltage into usable output current without violating loop compliance limits.
Can the LTC3255MPDD#TRPBF operate without an external flying capacitor?
No-the LTC3255MPDD#TRPBF requires an external ceramic flying capacitor (CFLY) connected between C+ and C– pins. The datasheet specifies a minimum value of 0.4µF over temperature and bias voltage; typical designs use 1µF X5R/X7R ceramics rated ≥VOUT + 1V. Omitting CFLY prevents charge transfer and renders the device nonfunctional-no internal capacitance substitutes for this external component.
What is the purpose of the PGOOD pin on the LTC3255MPDD#TRPBF?
PGOOD on the LTC3255MPDD#TRPBF is an open-drain logic output that signals valid regulation: it transitions to high-impedance when the FB pin voltage reaches ≥94% of the target output voltage, and pulls low otherwise (e.g., during startup, undervoltage lockout, or fault conditions). A pull-up resistor to VOUT or another rail enables system-level power sequencing, microcontroller reset coordination, or fault logging in industrial controllers.
Does the LTC3255MPDD#TRPBF require external compensation components?
No-the LTC3255MPDD#TRPBF uses a fixed-frequency, hysteretic Burst Mode® control architecture with internal compensation. No external compensation network is needed. Regulation is maintained solely by the FB resistor divider (setting output voltage) and proper selection of external capacitors (CFLY, CIN, COUT); layout best practices-especially minimizing stray capacitance on the FB node-are critical for stability.
LTC3255MPDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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-DFN (3x3)
LTC3255MPDD#TRPBF FAQ
1.How can I place an order for LTC3255MPDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255MPDD#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 LTC3255MPDD#TRPBF reliable?
The price and inventory of LTC3255MPDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255MPDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255MPDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255MPDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255MPDD#TRPBF?
LTC3255MPDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255MPDD#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 LTC3255MPDD#TRPBF?
For technical support, including LTC3255MPDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255MPDD#TRPBF requirements.
6.How does Aetrix verify that LTC3255MPDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255MPDD#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 LTC3255MPDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255MPDD#TRPBF?
All LTC3255MPDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255MPDD#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 LTC3255MPDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255MPDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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