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Analog Devices Inc. LTC3255EDD#TRPBF
- Part No.:
- LTC3255EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3255EDD#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,810
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Product details
Overview
LTC3255EDD#TRPBF from Analog Devices (formerly Linear Technology) is a switched-capacitor step-down DC/DC converter designed for current-fed industrial power rails. 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-enabling reliable housekeeping power in 4–20mA current loop sensor transmitters.
For engineers reviewing the LTC3255EDD#TRPBF datasheet, LTC3255EDD#TRPBF pinout, LTC3255EDD#TRPBF application, or LTC3255EDD#TRPBF equivalent, key selection considerations include its multimode charge pump (2:1/1:1 auto-switching), PGOOD open-drain status signal, FB-based output programming, thermal shutdown at 175°C, and compatibility with low-ESR ceramic flying/output capacitors in space-constrained industrial modules.
Technical Context
The LTC3255EDD#TRPBF implements a fractional switched-capacitor topology with automatic mode selection: it operates in 2:1 step-down mode when VIN > 2×VOUT (enabling current multiplication), and falls back to 1:1 mode near regulation limits. Its internal shunt regulator-enabled by connecting SHUNT to BIAS-allows stable operation from high-impedance 4–20mA current sources while maintaining VIN compliance within 2×VOUT + 3.5V.
Regulation is achieved via Burst Mode control, where fixed-charge packets are transferred only as needed to maintain FB = 1.200V ±24mV, minimizing idle power loss. The device integrates overtemperature protection (175°C shutdown, 165°C restart), output current limiting (120mA), and reverse-polarity input survivability without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 48V - supports wide industrial supply rails and legacy 24V/48V systems without pre-regulation |
| Output Voltage 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 - sufficient for powering microcontrollers, ADCs, and analog front-ends in sensor nodes |
| No-Load Quiescent Current | 16µA - extends battery life or reduces standby power in always-on instrumentation |
| Charge Pump Modes | Auto-switching 2:1 and 1:1 - maintains regulation across full VIN/VOUT range without manual configuration |
| VIN Shunt Regulator | Enabled by SHUNT-to-BIAS connection - allows direct use with 4–20mA current loops without external shunt resistors |
| PGOOD Threshold | 94% of VOUT (typical) - provides precise power-valid signaling for system sequencing and fault detection |
| Operating Junction Temp | –40°C to 125°C - qualified for harsh industrial environments including factory automation and SCADA |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND). Thermally enhanced layout requires soldering exposed pad to PCB ground plane for θJA ≤ 43°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 externally driven |
| VOUT (Pin 2) | Regulated output voltage | Delivers final DC output; bypassed with ≥10µF low-ESR ceramic capacitor |
| FB (Pin 3) | Feedback reference input | Servo point for 1.200V ±24mV regulation; sets VOUT via external resistor divider |
| 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/disable control input | Logic-high (>1.4V) enables converter; 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 operation |
| GND (Pins 8 & 11) | Power and signal ground | Pin 11 is exposed thermal pad - mandatory solder connection to PCB ground plane |
| C– (Pin 9) | Flying capacitor negative node | Connects to other terminal of flying capacitor; must not be externally driven |
| VIN (Pin 10) | Main input supply | Accepts 4V–48V; requires ≥1µF low-ESR ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Inductor-free step-down conversion | Eliminates magnetic components, reducing EMI, board area, and BOM cost in space-sensitive modules |
| Current multiplication in shunt mode | Converts 4mA input into continuous 7.4mA output - powers downstream circuitry from 4–20mA loops without external boosters |
| Reverse-polarity input tolerance | Withstands –52V on VIN without damage - protects against wiring errors in field-deployed industrial equipment |
| Integrated safety protections | Combines overtemperature shutdown (175°C), output short-circuit current limit (120mA), and undervoltage lockout (2.4V–5.7V thresholds) |
| Burst Mode efficiency optimization | Maintains 16µA quiescent current at no load while delivering >80% efficiency at 50mA across 12V input |
| Thermally optimized DFN package | 3mm × 3mm footprint with exposed GND pad enables compact placement and efficient heat dissipation in sealed enclosures |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering analog front-end, DAC, and microcontroller in a two-wire field transmitter powered solely by a 4–20mA loop. IC Role / Device Role / Timing Role: Housekeeping DC/DC converter providing isolated 3.3V rail from loop current, using VIN shunt mode to avoid exceeding loop compliance voltage. Use Value: Enables self-powered smart sensors without auxiliary supply; eliminates need for external shunt resistor and linear regulator. | Use Scenario: Generating stable 5V or 12V supply for MEMS accelerometers, temperature sensors, and wireless SoCs in factory-floor condition monitoring nodes. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24V plant power to clean, low-noise analog/digital rails. Use Value: Delivers 50mA with <10mV ripple using ceramic-only capacitors - avoids inductor-induced noise in precision measurement paths. |
| SCADA Remote I/O Module | Programmable Logic Controller (PLC) Auxiliary Rail |
Use Scenario: Providing auxiliary 3.3V logic supply in DIN-rail mounted remote I/O units receiving 48V DC from central power distribution. IC Role / Device Role / Timing Role: Fault-tolerant housekeeping regulator handling input transients, reverse polarity, and short circuits in electrically noisy environments. Use Value: Survives –52V reverse input and indefinite output shorts - reduces field failure rates and maintenance costs. | Use Scenario: Generating dedicated 5V rail for FPGA configuration memory and communication interfaces (RS-485, CAN) inside modular PLC backplanes. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter operating continuously at 125°C ambient in densely packed chassis. Use Value: 3mm × 3mm DFN package fits tight spacing constraints; exposed pad ensures thermal reliability under sustained 40mA load. |
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 |
|---|---|---|---|
| MAX17521ATP+T | Inductor-based buck converter; 4.5V–60V input; 500mA output; requires external inductor and compensation network | Higher output current but larger solution size and higher EMI; lacks current-loop shunt capability | Select when >50mA load current or tighter output voltage accuracy (<±1%) is required |
| LTC3265EDD#TRPBF | Inverting/positive dual-output charge pump; 4.5V–32V input; ±50mA outputs; no VIN shunt regulator or PGOOD | Provides bipolar rails but cannot replace LTC3255EDD#TRPBF in single-positive, current-loop–fed applications | Select when dual-rail (±VOUT) generation is needed and shunt-mode operation is unnecessary |
Compared with MAX17521ATP+T and LTC3265EDD#TRPBF, the LTC3255EDD#TRPBF uniquely combines current-loop compatibility, ultra-low quiescent current, and inductor-free design in a 3mm × 3mm DFN-making it optimal for space- and power-constrained industrial transmitters where fault resilience is critical.
Availability
LTC3255EDD#TRPBF is available at Aetrix Electronics and suitable for industrial control, factory automation, sensor conditioning, and SCADA systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3255EDD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision industrial, automotive, and communications applications.
The LTC3255 belongs to Linear's high-reliability switched-capacitor DC/DC converter family, engineered specifically for fault-tolerant, inductor-free power in 4–20mA current loop infrastructure and ruggedized industrial sensing platforms.
FAQ
What is the maximum output current capability of the LTC3255EDD#TRPBF?
The LTC3255EDD#TRPBF delivers up to 50mA of continuous output current when the VIN shunt regulator is disabled (SHUNT = GND) and input voltage exceeds twice the output voltage. In shunt-enabled mode (SHUNT = BIAS), it sustains 7.4mA output from a 4mA input source-leveraging 2:1 charge pumping to multiply current for 4–20mA loop applications. Peak current limit is 120mA, protecting against short circuits.
How does the LTC3255EDD#TRPBF achieve regulation without an inductor?
The LTC3255EDD#TRPBF uses a switched-capacitor (charge pump) architecture with internal flying capacitors (C+ and C– pins) and a 500kHz oscillator to transfer discrete charge packets from VIN to VOUT. Regulation is maintained by servoing the FB pin to 1.200V ±24mV via Burst Mode control-activating charge transfer only when output droop is detected-eliminating the need for magnetic components while achieving >80% efficiency at full load.
Can the LTC3255EDD#TRPBF operate from a reversed-polarity input supply?
Yes, the LTC3255EDD#TRPBF withstands –52V on the VIN pin without damage, thanks to integrated reverse-polarity protection. When VIN goes below ground, internal circuitry prevents VOUT from dropping more than a diode drop below GND, safeguarding downstream loads. This feature is intrinsic to the IC design and requires no external components-critical for field-deployed industrial equipment where wiring errors may occur.
What is the role of the SHUNT pin on the LTC3255EDD#TRPBF?
The SHUNT pin on the LTC3255EDD#TRPBF configures the VIN shunt regulator: connecting it to BIAS enables the shunt, allowing the LTC3255EDD#TRPBF to operate directly from high-impedance 4–20mA current loops by clamping VIN to ~2×VOUT + 3.5V; connecting it to GND disables the shunt, enabling standard step-down operation from voltage sources. Floating the pin is prohibited and may cause undefined behavior.
Does the LTC3255EDD#TRPBF require external compensation components?
No, the LTC3255EDD#TRPBF is internally compensated and requires no external compensation components. Its Burst Mode control loop and fixed-frequency oscillator are fully integrated. Only three external passive components are mandatory: a flying capacitor between C+ and C–, an output capacitor on VOUT, and a bypass capacitor on BIAS-all specified as low-ESR ceramics. The FB resistor divider is optional only if non-default output voltage is needed.
LTC3255EDD#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)
LTC3255EDD#TRPBF FAQ
1.How can I place an order for LTC3255EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3255EDD#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 LTC3255EDD#TRPBF reliable?
The price and inventory of LTC3255EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3255EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3255EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3255EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3255EDD#TRPBF?
LTC3255EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3255EDD#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 LTC3255EDD#TRPBF?
For technical support, including LTC3255EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3255EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3255EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3255EDD#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 LTC3255EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3255EDD#TRPBF?
All LTC3255EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3255EDD#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 LTC3255EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3255EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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