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Analog Devices Inc. LTC3626IUDC#TRPBF
- Part No.:
- LTC3626IUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3626IUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
LTC3626IUDC#TRPBF from Analog Devices (formerly Linear Technology) is a 20V, 2.5A synchronous monolithic step-down regulator with current mode control, programmable switching frequency (500kHz–3MHz), integrated power MOSFETs, and real-time input/output current and die temperature monitoring. It operates from 3.6V to 20V input, delivers 0.6V–6V output, and supports Burst Mode® or forced continuous operation in point-of-load power supplies for industrial instrumentation.
For engineers reviewing the LTC3626IUDC#TRPBF datasheet, LTC3626IUDC#TRPBF pinout, LTC3626IUDC#TRPBF application, or LTC3626IUDC#TRPBF equivalent, key selection criteria include its controlled on-time architecture for fast transient response, ±1% VFB reference accuracy over temperature, average current monitoring resolution (1/16000 scaling), thermal shutdown programmability via TSET/TMON, and compatibility with small 3mm × 4mm QFN-20 packages requiring exposed-pad thermal management.
Technical Context
The LTC3626IUDC#TRPBF employs a phase-lockable controlled on-time, current-mode architecture where the top MOSFET on-time is servoed by an internal PLL to match either an internal oscillator (set by RT resistor) or external SYNC clock. This enables stable high-frequency operation (up to 3MHz) even at high step-down ratios while maintaining excellent line and load transient response.
It integrates dual N-channel MOSFETs (RDS(ON) = 115mΩ/70mΩ), a 0.6V ±1% reference, error amplifier with ITH compensation node, and independent current limit amplifiers for IMONIN/IMONOUT pins-each comparing against a 1.22V threshold to enable programmable average input/output current limiting with external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports wide-input industrial and battery-powered systems without pre-regulation |
| Output Current | Up to 2.5A - sufficient for FPGA core rails, DSP processors, and ASIC point-of-load applications |
| Switching Frequency | 500kHz to 3MHz - adjustable via RT resistor; enables optimization of inductor size vs. efficiency trade-off |
| Feedback Reference | 0.600V ±1% over –40°C to 125°C - ensures precise output voltage regulation across full operating range |
| Current Monitoring Scale | 1/16000 - IMONIN and IMONOUT deliver µA-level currents proportional to average input/output current for accurate sensing |
| Die Temperature Sensing | 200mV/°C linear slope at TMON - allows direct Kelvin/Celsius conversion and programmable thermal shutdown via TSET |
| Thermal Shutdown Hysteresis | 50mV - corresponds to ~25°C hysteresis, preventing oscillation near trip point during thermal recovery |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN with exposed PGND pad (Pin 21), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Floating gate driver supply | Connects to bootstrap capacitor (+) to generate gate drive above PVIN for high-side MOSFET |
| INTVCC (2) | Internal 3.3V regulator output | Powers internal circuitry; requires ≥1µF ceramic decoupling to PGND; disabled during RUN=low |
| VON (3) | On-time voltage input | Sets comparator threshold for controlled on-time; tied to VOUT for constant-frequency operation below 6V |
| TSET (4) | Temperature limit set input | Voltage reference for overtemperature comparator; sets shutdown threshold (e.g., 1.5V = 75°C) |
| TMON (5) | Digital die temperature monitor | Outputs 1.5V at 25°C with 200mV/°C slope; tie to INTVCC to disable monitoring |
| SGND (6) | Signal ground reference | Low-noise return for FB divider, RT, ITH, IMONIN/IMONOUT; separate from PGND to minimize noise coupling |
| IMONIN (7) | Average input current monitor | Sinks current scaled 1/16000× IIN(avg); compare to 1.22V threshold to implement programmable input current limit |
| IMONOUT (8) | Average output current monitor | Sinks current scaled 1/16000× IOUT(avg); compare to 1.22V threshold to implement programmable output current limit |
| TRACK/SS (9) | Soft-start & output tracking | Internal 1.4µA pull-up enables soft-start with external capacitor; voltage <0.6V forces FB tracking |
| FB (10) | Feedback input | Compares resistive divider output to 0.6V reference; determines regulated output voltage |
| ITH (11) | Error amplifier output | Compensation node for loop stability; connect RC network or tie to INTVCC for internal compensation |
| RT (12) | Oscillator frequency set | Resistor to SGND programs fSW from 500kHz–3MHz; tie to INTVCC for default 2MHz |
| RUN (13) | Enable control | High >1.23V enables operation; low <0.97V places device in shutdown with <2µA quiescent current |
| SVIN (14) | Signal power supply | Supplies current to internal 3.3V regulator; decouple locally to SGND |
| PVIN (15,16) | Main power input | High-current input path; requires low-ESR bulk capacitance (≥10µF) tied directly to PGND |
| MODE/SYNC (17) | Mode select & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = PLL-synchronized forced continuous |
| PGOOD (18) | Power good status | Open-drain output pulled low when FB deviates >±8%; releases at ±5% with 40µs filter to suppress transients |
| SW (19,20) | Switch node | Connects to inductor; swings from PGND to PVIN; requires low-inductance layout to minimize EMI |
| PGND (21) | Power ground | Exposed pad; must be soldered to PCB plane for thermal dissipation and low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time current mode architecture | Enables stable high-frequency operation (up to 3MHz) with fast transient response and minimal output capacitance |
| Integrated 115mΩ/70mΩ MOSFETs | Delivers up to 95% efficiency at 2.5A without external switches; reduces BOM count and layout complexity |
| Programmable average current limits | Independent IMONIN/IMONOUT pins allow setting precise input or output current thresholds using simple resistor dividers |
| Dual thermal protection | Programmable TSET-based shutdown + secondary internal overtemperature cutoff at TJMAX = 125°C |
| Burst Mode® and forced continuous modes | User-selectable via MODE/SYNC pin to optimize light-load efficiency (>85% at 1mA) or output ripple/noise performance |
Applications
| Distributed Power Systems | Battery-Powered Instruments |
|---|---|
Use Scenario: Intermediate bus conversion in multi-rail systems with varying load profiles and space constraints. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.3V/2.5A from 12V intermediate bus with synchronized switching to reduce system EMI. Use Value: Controlled on-time architecture maintains regulation stability under rapid load steps; PGOOD enables sequencing with downstream regulators. | Use Scenario: Portable test equipment requiring long battery life and reliable rail generation under variable loads. IC Role / Device Role / Timing Role: Core power supply for microcontroller and analog front-end, operating in Burst Mode® to extend runtime at standby. Use Value: Sleep current <350µA and programmable current limits prevent battery over-discharge; thermal monitoring protects Li-ion cells during charging cycles. |
| Point-of-Load Power Supply | Industrial Control Modules |
Use Scenario: FPGA or ASIC core voltage regulation on dense PCBs with strict thermal and EMI requirements. IC Role / Device Role / Timing Role: High-efficiency 1.2V/2.5A buck converter with external frequency synchronization to avoid beat frequencies with system clocks. Use Value: 3mm × 4mm QFN package fits tight layouts; IMONOUT provides real-time current telemetry for fault logging and predictive maintenance. | Use Scenario: Programmable logic controller (PLC) I/O module needing robust 5V rail with overcurrent and overtemperature protection. IC Role / Device Role / Timing Role: Main 5V supply with programmable input current limit (via IMONIN) and die temperature monitoring (TMON/TSET) for ambient derating. Use Value: Dual current monitoring enables compliance with IEC 61000-4-5 surge immunity; thermal hysteresis prevents nuisance shutdowns in hot enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 2MHz frequency, no current monitoring, no temperature sensing, lower 36V max input | Lacks IMONIN/IMONOUT and TMON/TSET; suitable only for basic fixed-frequency PoL where telemetry is unnecessary | Select when cost sensitivity outweighs need for diagnostics and thermal management |
| TPS54227PWPR | 2.95V–6V input range, no integrated current sense, no die temperature monitor, 2A max output | Cannot support 12V+ inputs or 2.5A loads; lacks current/thermal telemetry required for industrial reliability | Choose only for low-voltage, low-power applications where footprint and cost are primary constraints |
Compared with MP2451DT-LF-Z and TPS54227PWPR, the LTC3626IUDC#TRPBF uniquely combines wide-input capability (3.6V–20V), 2.5A output, and integrated current/temperature telemetry in a thermally enhanced QFN-making it the only option among the three that supports diagnostic-aware, high-reliability industrial power design.
Availability
LTC3626IUDC#TRPBF is available at Aetrix Electronics and suitable for distributed power systems, battery-powered instruments, and point-of-load power supplies requiring stable component supply, extended temperature operation (–40°C to 125°C), and production-ready thermal management.
Supply support for LTC3626IUDC#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3626 belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-efficiency, high-density point-of-load applications demanding precision regulation, fast transient response, and integrated system monitoring capabilities.
FAQ
What is the maximum input voltage rating for the LTC3626IUDC#TRPBF?
The LTC3626IUDC#TRPBF has an absolute maximum PVIN rating of 22V, with overvoltage lockout triggered at 21.5V (typical). Continuous operation is specified up to 20V input. Exceeding 20V risks violating the recommended operating conditions and may cause premature failure or reduced lifetime, especially under high ambient temperatures.
How does the LTC3626IUDC#TRPBF implement current limiting using IMONIN and IMONOUT?
The LTC3626IUDC#TRPBF sources a current from IMONIN and IMONOUT pins equal to 1/16000 of the average input or output current. By connecting a resistor from each pin to SGND, the resulting voltage is compared to a 1.22V internal threshold. When the voltage reaches 1.22V, the regulator throttles switching to maintain the programmed current limit-enabling precise, externally adjustable average current protection without sense resistors.
Can the LTC3626IUDC#TRPBF operate without external compensation components?
Yes, the LTC3626IUDC#TRPBF supports internal compensation. Connecting the ITH pin directly to INTVCC configures the device for default loop compensation optimized for typical 2.2µH inductors and 47µF ceramic output capacitors. External compensation is optional and recommended only for non-standard output capacitance, ultra-low ESR caps, or specialized transient response requirements.
What is the function of the TSET and TMON pins on the LTC3626IUDC#TRPBF?
TMON outputs a voltage proportional to die temperature (200mV/°C), while TSET sets the overtemperature shutdown threshold. Applying a voltage to TSET (e.g., 1.5V for 75°C) creates a comparator reference; when TMON reaches that voltage, the LTC3626IUDC#TRPBF initiates shutdown and restarts after internal temperature drops ~10°C. TMON can be tied to INTVCC to disable monitoring entirely.
Is the LTC3626IUDC#TRPBF pin-compatible with other members of the LTC362x family?
No, the LTC3626IUDC#TRPBF is not pin-compatible with LTC3621/LTC3622/LTC3624 due to differences in pin count, function allocation, and package. For example, LTC3621 uses a 16-pin QFN and lacks IMONIN/IMONOUT/TMON/TSET pins. Migration requires board redesign and validation; always verify pin mapping and thermal pad layout against the specific datasheet.
LTC3626IUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 19.4V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 500KHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC3626IUDC#TRPBF FAQ
1.How can I place an order for LTC3626IUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3626IUDC#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 LTC3626IUDC#TRPBF reliable?
The price and inventory of LTC3626IUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3626IUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3626IUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3626IUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3626IUDC#TRPBF?
LTC3626IUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3626IUDC#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 LTC3626IUDC#TRPBF?
For technical support, including LTC3626IUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3626IUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3626IUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3626IUDC#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 LTC3626IUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3626IUDC#TRPBF?
All LTC3626IUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3626IUDC#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 LTC3626IUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3626IUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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