My Inquiry
My Account
Analog Devices Inc. LTC3626IUDC#PBF
- Part No.:
- LTC3626IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3626IUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,166
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3626IUDC#PBF from Analog Devices (formerly Linear Technology) is a 20V, 2.5A monolithic synchronous step-down regulator with integrated current and temperature monitoring. It features a phase-lockable controlled on-time current mode architecture, 3.6V–20V input range, 0.6V–6V output range, and operates at 500kHz–3MHz. Used in point-of-load power supplies for FPGA, ASIC, and DSP core rails.
For engineers reviewing the LTC3626IUDC#PBF datasheet, LTC3626IUDC#PBF pinout, LTC3626IUDC#PBF application, or LTC3626IUDC#PBF equivalent, key selection criteria include its programmable average input/output current limit, die temperature monitoring with TSET/TMON pins, Burst Mode® vs forced continuous mode trade-offs, and QFN-20 (3mm × 4mm) thermal performance under 2.5A load.
Technical Context
The LTC3626IUDC#PBF implements a current-mode controlled on-time architecture with internal PLL synchronization-enabling precise frequency alignment to internal or external clocks while maintaining fast transient response. Its valley-current sensing via bottom MOSFET RDS(ON) and error amplifier control of ITH node directly governs inductor current regulation.
It integrates dual current monitors (IMONIN/IMONOUT), a die temperature sensor (TMON) with programmable shutdown threshold (TSET), and a 0.6V ±1% reference with 0.01%/V line regulation. The device supports output voltage tracking via TRACK/SS and provides PGOOD with ±8% fault detection and ±5% release hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 20V - supports wide-input industrial, automotive, and distributed supply rails without pre-regulation. |
| Output Current | Up to 2.5A - sufficient for powering high-performance digital ICs including FPGA I/O and core domains. |
| Switching Frequency | 500kHz to 3MHz - enables use of compact 2.2µH inductors and low-ESR ceramic capacitors. |
| Feedback Reference | 0.6V ±1% over temperature - ensures stable output regulation across –40°C to 125°C junction range. |
| Top/Bottom RDS(ON) | 115mΩ / 70mΩ - contributes to ≥95% peak efficiency at 12VIN/3.3VOUT/2.5A. |
| Current Monitoring | IMONIN & IMONOUT scale 1:16,000 - allows accurate average input/output current limiting with external resistor-to-SGND. |
| Die Temperature Sensing | TMON = 200°C/V scaling - enables real-time junction temperature readback and programmable thermal shutdown via TSET pin. |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN with exposed PGND pad (Pin 21), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (15,16) | Main power input | High-current path for up to 2.5A; requires low-impedance decoupling to PGND. |
| SW (19,20) | Switch node | Connects to inductor; swings from GND to PVIN; critical for EMI layout and gate drive integrity. |
| BOOST (1) | Floating gate driver supply | Supplies top MOSFET gate drive; tied to SW via bootstrap capacitor (CBST). |
| INTVCC (2) | Internal 3.3V LDO output | Powers internal circuitry; must be decoupled with ≥1µF ceramic to PGND; disabled during shutdown. |
| VON (3) | On-time voltage input | Sets proportional on-time for VOUT < 6V; ties to VOUT for constant-frequency operation. |
| TSET (4) | Temperature limit set | Defines overtemperature shutdown threshold (e.g., 1.5V = 75°C); referenced against TMON voltage. |
| TMON (5) | Digital die temperature monitor | Outputs 200°C/V analog voltage; used for telemetry or closed-loop thermal management. |
| SGND (6) | Signal ground reference | Low-noise return for FB, RT, ITH, IMONIN/OUT, TRACK/SS; separate from PGND for noise isolation. |
| IMONIN (7) | Average input current monitor | Sinks 1/16,000× IIN(avg); used with resistor-to-SGND to set programmable input current limit. |
| IMONOUT (8) | Average output current monitor | Sinks 1/16,000× IOUT(avg); enables precision output current limiting and load telemetry. |
| TRACK/SS (9) | Tracking & soft-start control | Enables voltage sequencing (tracking) or controlled startup via external capacitor (CSS). |
| FB (10) | Feedback input | Compares divider output to 0.6V reference; sets regulated VOUT = 0.6V × (1 + R1/R2). |
| ITH (11) | Error amplifier output | Loop compensation node; connects to RC network for stability; tie to INTVCC for internal compensation. |
| RT (12) | Frequency programming | Resistor-to-SGND sets fSW = 500kHz–3MHz; tie to INTVCC for default 2MHz operation. |
| RUN (13) | Enable input | Active-high enable: >1.23V starts regulation; <0.97V forces shutdown with ≤2µA quiescent current. |
| SVIN (14) | Signal power supply | Provides bias current to internal 3.3V regulator; must be connected to PVIN or local 3.3V rail. |
| MODE/SYNC (17) | Mode select & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = PLL-synchronized operation. |
| PGOOD (18) | Power good status | Open-drain output asserts low when FB deviates >±8% from 0.6V; releases at ±5% with 40µs filter. |
| PGND (21) | Power ground | Exposed thermal pad; must be soldered to PCB plane for thermal dissipation and low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 39µA typical at light loads while maintaining regulation-ideal for battery-powered instruments. |
| Programmable current limits | Independent average input and output current limiting via IMONIN/IMONOUT pins and external resistors-supports robust overcurrent protection. |
| Dual-mode thermal management | Real-time die temperature telemetry (TMON) plus user-programmable shutdown (TSET)-enables predictive thermal throttling in dense PCB layouts. |
| External frequency synchronization | PLL-based MODE/SYNC input accepts external clock (500kHz–3MHz) for EMI reduction and multi-rail coherence in system-level designs. |
| Output voltage tracking | TRACK/SS pin supports precise sequencing of multiple rails (e.g., core before I/O) using simple resistor-divider or DAC control. |
Applications
| Point-of-Load Power Supply | Distributed Power Systems |
|---|---|
|
Use Scenario: Providing tightly regulated 1.8V/2.5A to an FPGA core rail on a high-density server motherboard. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering dynamic load current with sub-100µs transient response and ±1% output accuracy. Use Value: Integrated current monitoring enables real-time load validation; thermal sensing prevents junction overheating during burst-mode compute workloads. |
Use Scenario: Powering multiple isolated subsystems (e.g., ADC, MCU, RF transceiver) from a shared 12V backplane in telecom infrastructure. IC Role / Device Role / Timing Role: Independent, synchronized buck regulator per subsystem-frequency locked via MODE/SYNC to minimize beat frequencies. Use Value: Programmable switching frequency avoids sensitive bands; PGOOD signals enable coordinated system power-up sequencing. |
| Battery-Powered Instruments | Industrial Embedded Controllers |
|
Use Scenario: Supplying 3.3V/1.5A to a portable handheld test instrument powered by Li-ion battery (3.6V–4.2V nominal). IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating down to 3.6V input, supporting deep discharge while maintaining regulation. Use Value: Burst Mode® reduces sleep current to 39µA, extending battery life; IMONOUT enables battery discharge current telemetry. |
Use Scenario: Generating 5V/2A for PLC I/O modules in factory automation systems with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Robust, thermally managed power stage with overvoltage lockout (PVIN >21.5V) and short-circuit protection. Use Value: Exposed PGND pad and 125°C-rated package ensure reliable operation in convection-cooled enclosures; TMON feedback supports derating algorithms. |
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; 0.8V reference; 2A max output. | Lacks IMONIN/IMONOUT, TMON/TSET, and programmable frequency-suitable only for cost-sensitive, non-telemetry applications. | Select when design prioritizes BOM simplicity over diagnostics and thermal awareness. |
| TPS54227PWPR | 2.95V–6V input range; 2A output; integrated compensation; no current monitoring; 0.8V reference. | Not suitable for 12V/20V inputs; lacks die temperature sensing and average current limit capability. | Choose only for low-input-voltage, space-constrained designs where full LTC3626IUDC#PBF feature set is unnecessary. |
Compared with MP2451DT-LF-Z and TPS54227PWPR, the LTC3626IUDC#PBF delivers unique value through simultaneous input/output current monitoring, real-time die temperature telemetry, and programmable thermal shutdown-making it indispensable for mission-critical, thermally constrained, or battery-sensitive applications requiring full system visibility.
Availability
LTC3626IUDC#PBF is available at Aetrix Electronics and suitable for point-of-load power supplies, distributed power systems, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3626IUDC#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 with rigorous qualification and long-term product support.
The LTC3626IUDC#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, high-density, and thermally aware power conversion in FPGA, ASIC, and embedded processor applications.
FAQ
What is the maximum input voltage rating for the LTC3626IUDC#PBF?
The LTC3626IUDC#PBF has an absolute maximum PVIN rating of 22V, with overvoltage lockout triggering at 21.5V (typical) to protect internal MOSFETs. Continuous operation is specified up to 20V, making it suitable for 12V and 19V industrial rails. Exceeding 20V risks permanent damage unless transient clamping is implemented externally.
How does the LTC3626IUDC#PBF implement current monitoring and limiting?
The LTC3626IUDC#PBF provides two independent current monitoring paths: IMONIN sinks 1/16,000× average input current, and IMONOUT sinks 1/16,000× average output current. Connecting a resistor from either pin to SGND creates a voltage that compares to 1.2V (typical) internally-allowing precise programmable current limiting without external sense resistors or amplifiers.
Can the LTC3626IUDC#PBF operate in forced continuous mode, and how is it enabled?
Yes, the LTC3626IUDC#PBF supports forced continuous conduction mode (CCM) by tying the MODE/SYNC pin to ground. This disables Burst Mode® operation and ensures uninterrupted switching regardless of load, reducing output voltage ripple and EMI at the expense of higher light-load quiescent current-critical for noise-sensitive analog or RF circuits.
What thermal protection mechanisms does the LTC3626IUDC#PBF provide?
The LTC3626IUDC#PBF offers dual thermal protection: (1) a user-programmable overtemperature shutdown via TSET pin (e.g., 1.5V = 75°C), and (2) an internal secondary shutdown at TJ ≈ 150°C (per Note 4). TMON provides real-time die temperature telemetry (200°C/V), enabling firmware-based thermal management before shutdown occurs.
Is the LTC3626IUDC#PBF pin-compatible with other members of the LTC3626 family?
Yes, all LTC3626 variants-including LTC3626EUDC#PBF and LTC3626IUDC#PBF-share identical 20-lead QFN (3mm × 4mm) packaging and pinout. The 'I' grade guarantees operation from –40°C to 125°C junction temperature, while the 'E' grade is rated for 0°C to 85°C; both use the same PCB footprint and schematic symbols.
LTC3626IUDC#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)
LTC3626IUDC#PBF FAQ
1.How can I place an order for LTC3626IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3626IUDC#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 LTC3626IUDC#PBF reliable?
The price and inventory of LTC3626IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3626IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3626IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3626IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3626IUDC#PBF?
LTC3626IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3626IUDC#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 LTC3626IUDC#PBF?
For technical support, including LTC3626IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3626IUDC#PBF requirements.
6.How does Aetrix verify that LTC3626IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3626IUDC#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 LTC3626IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3626IUDC#PBF?
All LTC3626IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3626IUDC#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 LTC3626IUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3626IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3626IUDC#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
