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Analog Devices Inc. LTC3626EUDC#PBF
- Part No.:
- LTC3626EUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3626EUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:492
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Product details
Overview
LTC3626EUDC#PBF from Analog Devices (formerly Linear Technology) is a 20V, 2.5A monolithic synchronous step-down regulator with current-mode control, integrated power MOSFETs, and real-time input/output current + die temperature monitoring. It operates from 3.6V to 20V input, delivers 0.6V–6V output, achieves up to 95% efficiency, and supports programmable 500kHz–3MHz switching in a thermally enhanced 20-lead 3mm × 4mm QFN package - deployed in point-of-load power supplies for FPGA, ASIC, and DSP core rails.
For engineers reviewing the LTC3626EUDC#PBF datasheet, LTC3626EUDC#PBF pinout, LTC3626EUDC#PBF application, or LTC3626EUDC#PBF equivalent, key selection criteria include its controlled on-time architecture for fast transient response, dual-mode operation (Burst Mode® vs forced continuous), ±1% reference accuracy over temperature, average current monitoring scalability (1/16000 ratio), and integrated thermal fault protection with user-programmable TSET threshold.
Technical Context
The LTC3626EUDC#PBF implements a phase-lockable controlled on-time, current-mode architecture: an internal one-shot timer sets top-FET on-time based on VON voltage, while valley current sensing via bottom-FET RDS(ON) determines off-time termination. An internal PLL aligns switching edges to either the RT-programmed oscillator or an external SYNC clock, enabling deterministic frequency control across wide VIN/VOUT ratios.
It integrates dual independent current limit amplifiers (1.22V threshold) for IMONIN and IMONOUT pins, each accepting external resistors to set average input/output current limits; plus a dedicated temperature monitor path where TMON voltage (200 mV/°C) feeds a comparator referenced to user-configured TSET voltage - triggering shutdown when die temperature exceeds the programmed threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports wide-input industrial, automotive, and distributed power systems without pre-regulation |
| Output Current | Up to 2.5A DC - sufficient for powering high-performance digital IC core rails with margin |
| Switching Frequency | 500kHz to 3MHz, programmable via RT resistor - enables optimization of inductor size vs conduction loss |
| Reference Voltage | 0.600V ±1% over –40°C to 125°C - ensures stable output regulation across full operating junction temperature range |
| Efficiency | Up to 95% - achieved via low RDS(ON) integrated switches (115mΩ top / 70mΩ bottom) |
| Current Monitoring Ratio | 1/16000 for both IMONIN and IMONOUT - allows precise average current measurement using standard resistor values |
| Thermal Monitor Slope | 200 mV/°C at TMON - enables direct Kelvin-to-voltage conversion for on-die temperature tracking |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN with exposed PGND pad (Pin 21), rated for –40°C to 125°C junction temperature. Thermal resistance θJA = 47°C/W; exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (15,16) | Main power input | High-current input path for switch node; requires low-ESR bulk capacitance tied directly to PGND |
| SW (19,20) | Switch node | Connects to inductor; swings from PGND to PVIN; critical for EMI layout and gate drive loop minimization |
| PGND (21) | Power ground | Exposed thermal pad; must be soldered to PCB plane for thermal dissipation and low-impedance return path |
| IMONIN (7) | Average input current monitor | Sinks current proportional to IIN(AVG) (1/16000); used with resistor to SGND to set programmable input current limit |
| IMONOUT (8) | Average output current monitor | Sinks current proportional to IOUT(AVG) (1/16000); enables load-current-based protection or telemetry |
| TMON (5) | Digital die temperature monitor | Outputs voltage linearly proportional to junction temperature (200 mV/°C); used with comparator for thermal shutdown |
| TSET (4) | Temperature limit reference | Sets overtemperature trip point by voltage divider from INTVCC; triggers shutdown when TMON ≥ TSET |
| MODE/SYNC (17) | Operation mode control | Selects Burst Mode® (floating/INTVCC) or forced continuous (ground); accepts external clock for synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time architecture | Enables stable high-frequency operation (up to 3MHz) with fast load transient response even at high step-down ratios |
| Integrated current and temperature monitoring | Eliminates need for external sense resistors or thermal sensors - reduces BOM count and board area |
| Programmable average current limiting | Allows precise setting of input/output current thresholds using single external resistors per channel |
| Burst Mode® and forced continuous modes | Optimizes light-load efficiency (Burst) or output ripple/noise (forced continuous) without hardware change |
| Power Good (PGOOD) with filtering | Open-drain status signal with 40µs glitch filter ensures reliable system sequencing and fault detection |
Applications
| FPGA Core Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Delivering tightly regulated 1.2V/2A to Xilinx Artix-7 FPGA core logic under dynamic load steps up to 2A/µs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing core rail with fast transient response and accurate current telemetry for thermal derating. Use Value: Controlled on-time architecture maintains regulation during rapid load transients; IMONOUT enables real-time current logging for predictive maintenance. |
Use Scenario: Generating isolated 3.3V/1.5A supply for analog sensor interface circuitry in harsh factory-floor environments. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck converter with robust overvoltage (21.5V PVIN OVP) and thermal fault protection. Use Value: 3.6V–20V input range accommodates unregulated 12V/24V industrial rails; TSET-programmable shutdown prevents thermal runaway in sealed enclosures. |
| Medical Imaging Sensor Bias | Automotive ADAS Camera Module |
Use Scenario: Providing ultra-low-noise 5V/1A bias for CMOS image sensor analog front-end in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-ripple power source with selectable forced continuous mode to suppress switching noise in sensitive analog paths. Use Value: Forced continuous operation eliminates Burst Mode® frequency modulation artifacts; ±1% reference ensures consistent sensor gain calibration. |
Use Scenario: Powering 1.8V/2A vision processor SoC in rear-view camera module with ambient temperature up to 105°C. IC Role / Device Role / Timing Role: Automotive-grade buck regulator delivering core voltage with integrated die temperature monitoring and programmable thermal limit. Use Value: TMON/TSET interface enables closed-loop thermal management; –40°C to 125°C rating meets AEC-Q200-relevant stress conditions. |
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/temperature monitoring, lower 36V max input, 2A output | Lacks IMONIN/IMONOUT/TMON interfaces; suitable only for cost-sensitive, non-telemetry designs | Choose when monitoring features are unnecessary and board space is constrained |
| TPS54227DDAR | 2.95V–6V input, 2A output, no integrated current monitoring, uses external compensation | Not compatible with wide-input (>6V) or current-limiting requirements; limited thermal visibility | Select only for low-VIN applications where input stays below 6V and telemetry is omitted |
Compared with MP2451DT-LF-Z and TPS54227DDAR, the LTC3626EUDC#PBF uniquely combines wide 3.6V–20V input, 2.5A capability, and integrated current/temperature monitoring in a single QFN - enabling compact, intelligent power delivery where system-level diagnostics and thermal safety are required.
Availability
LTC3626EUDC#PBF is available at Aetrix Electronics and suitable for FPGA core power, industrial PLC modules, medical imaging bias supplies, and automotive ADAS camera systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3626EUDC#PBF 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, emphasizing precision, reliability, and integration for demanding industrial, automotive, and communications applications.
The LTC3626EUDC#PBF belongs to Linear's monolithic synchronous buck regulator family designed for high-efficiency, high-density point-of-load conversion with embedded system monitoring - targeting applications needing intelligence beyond basic voltage regulation.
FAQ
What is the maximum input voltage rating for the LTC3626EUDC#PBF?
The LTC3626EUDC#PBF has an absolute maximum PVIN rating of 22V, with overvoltage lockout triggered at 21.5V (typical). Operation is guaranteed from 3.6V to 20V input; exceeding 20V risks permanent damage unless transient clamping is implemented externally. The device suspends switching and resets soft-start upon OV condition, resuming only after PVIN falls below 20.5V.
How does the LTC3626EUDC#PBF implement current monitoring and what is the scaling factor?
The LTC3626EUDC#PBF provides two separate current monitoring outputs: IMONIN sinks current proportional to average input current, and IMONOUT sinks current proportional to average output current. Both scale at exactly 1/16,000 - meaning 2.5A output yields 156.25µA at IMONOUT. Each pin connects to a 1.22V threshold amplifier, allowing programmable current limiting via a single resistor to SGND.
Can the LTC3626EUDC#PBF operate in forced continuous mode and how is it enabled?
Yes, the LTC3626EUDC#PBF supports forced continuous conduction mode (CCM) to minimize output voltage ripple and EMI. It is enabled by pulling the MODE/SYNC pin to ground. In this mode, both internal MOSFETs remain active across all load conditions - eliminating discontinuous operation and Burst Mode® frequency variation, which is essential for noise-sensitive analog circuits.
What is the function of the TMON and TSET pins on the LTC3626EUDC#PBF?
TMON (Pin 5) outputs a voltage linearly proportional to on-die temperature at 200 mV/°C. TSET (Pin 4) sets the overtemperature shutdown threshold: when TMON ≥ TSET, the LTC3626EUDC#PBF initiates shutdown, resets soft-start, and attempts restart once die temperature drops ~10°C below the TSET-defined threshold. This enables user-configurable thermal protection without external sensors.
Is the LTC3626EUDC#PBF pin-compatible with other members of the LTC3626 family?
Yes, the LTC3626EUDC#PBF shares identical pinout and footprint with all variants in the LTC3626 family (e.g., LTC3626IUDC#PBF), differing only in temperature grade specification (–40°C to 125°C for both E and I grades). All share the same 20-lead 3mm × 4mm QFN package, identical absolute maximum ratings, and fully compatible external circuitry - enabling drop-in replacement within thermal design margins.
LTC3626EUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3626EUDC#PBF FAQ
1.How can I place an order for LTC3626EUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3626EUDC#PBF 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 LTC3626EUDC#PBF reliable?
The price and inventory of LTC3626EUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3626EUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3626EUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3626EUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3626EUDC#PBF?
LTC3626EUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3626EUDC#PBF 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 LTC3626EUDC#PBF?
For technical support, including LTC3626EUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3626EUDC#PBF requirements.
6.How does Aetrix verify that LTC3626EUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3626EUDC#PBF 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 LTC3626EUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3626EUDC#PBF?
All LTC3626EUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3626EUDC#PBF, 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 LTC3626EUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3626EUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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