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Analog Devices Inc. LTC3623IUDD#TRPBF
- Part No.:
- LTC3623IUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3623IUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
LTC3623IUDD#TRPBF from Analog Devices is a high-efficiency, monolithic synchronous buck regulator with ±5A output current capability, 4V–15V input range (SVIN), and 1.5V–15V power input range (PVIN). It features single-resistor programmable VOUT from 0V to VIN – 0.5V, 400kHz–4MHz adjustable switching frequency, and integrated 60mΩ/30mΩ N-MOSFETs - designed for point-of-load power in battery-powered instrumentation and DDR memory supplies.
For engineers reviewing the LTC3623IUDD#TRPBF datasheet, LTC3623IUDD#TRPBF pinout, LTC3623IUDD#TRPBF application, or LTC3623IUDD#TRPBF equivalent, key selection criteria include its ±1% ISET current accuracy, ±5% output current monitor accuracy, programmable wire-drop compensation, Silent Switcher® architecture for EMI reduction, and support for pre-biased start-up and input voltage regulation loops.
Technical Context
The LTC3623IUDD#TRPBF employs constant-frequency/controlled on-time current-mode control with internal 50µA ISET current source, enabling precise VOUT programming via external resistor or direct voltage drive. Its error amplifier regulates VOUT by servoing ITH to match ISET voltage, while valley-current sensing ensures fast transient response across load steps.
It integrates dual N-MOSFETs (60mΩ top / 30mΩ bottom), supports discontinuous (DCM) or forced continuous conduction mode (CCM) via MODE/SYNC pin, and includes VIN overvoltage lockout (15.5V–16.8V), PGOOD with ±7.5% window (0.54V–0.63V at PGFB), and IMON-based current monitoring with 21µA/A scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0V to VIN – 0.5V - enables ultra-low output biasing and tracking applications |
| IOUT Rating | ±5A - supports high-current POL rails for ASICs and TEC drivers |
| Switching Frequency | 400kHz to 4MHz - selectable via RT resistor for size/efficiency trade-off |
| ISET Accuracy | ±1% (25°C) - ensures tight VOUT regulation across full output range |
| Current Monitor Accuracy | ±5% - enables reliable load current reporting and programmable OCL |
| Efficiency | Up to 96% - achieved via low RDS(ON) MOSFETs and optimized gate drive |
| Package | 24-lead 3mm × 5mm QFN with exposed thermal pad - supports >3A continuous PCB heat dissipation |
Pinout & Package
24-lead (3mm × 5mm) plastic QFN package with exposed thermal pad (Pin 25 = PGND), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB ground for thermal performance and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Error amplifier positive input / 50µA current source | Directly programs VOUT; soft-start enabled via CISET; supports external voltage drive |
| PGOOD (2) | Open-drain power-good indicator | Pulled low if PGFB < 0.54V or > 0.63V; referenced to GSNS |
| RUN (3) | Enable/shutdown control | 1.45V threshold for full operation; <1V disables switching; <0.4V shuts down entire IC |
| GSNS (4) | Ground reference for RUN/PGOOD/MODE/SYNC | Must connect to PGND for positive-VOUT designs; defines local signal ground |
| PVIN (5,16) | Main power input (1.5V–15V) | Drives top MOSFET drain; requires local ceramic decoupling to PGND |
| SW (6,15) | Switch node | Connects to inductor; swings from ~–0.3V to PVIN; critical for EMI layout |
| PGND (9–12,25) | Power ground return path | Return for internal MOSFETs and input/output capacitors; exposed pad is mandatory GND connection |
| VOUT (13) | Regulated output voltage | Negative EA input; directly fed back to maintain equality with ISET voltage |
| SVIN (17) | Signal supply input (4V–15V) | Powers internal bias circuitry; independent of PVIN for dual-rail flexibility |
| BOOST (18) | Floating gate drive supply | Connected to bootstrap capacitor (+) terminal; enables high-side NMOS drive |
| INTVCC (19) | Internal 5V LDO output | Powers control logic and gate drivers; requires ≥1µF ceramic bypass to PGND |
| PGFB (20) | Power-good feedback divider node | Sets PGOOD window; tie to INTVCC to disable PGOOD function |
| IMON (21) | Current monitor output | 21µA/A scaled replica of IOUT; used for OCL programming and cable drop compensation |
| VIN_REG (22) | Input voltage regulation control | Tie to resistor divider from VIN to enable backup supply hold-up functionality |
| RT (23) | Frequency programming input | Resistor-to-GND sets fSW; tie to INTVCC for 1MHz default |
| ITH (24) | Error amplifier output / compensation node | Controls peak inductor current; supports internal (tie to INTVCC) or external compensation |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces EMI emissions without shielding or ferrites - critical for sensitive analog/RF systems |
| Programmable wire-drop compensation | Uses IMON current injected into ISET resistor to offset voltage drop across PCB traces or cables |
| Pre-biased start-up support | Enters DCM and holds switches off until ISET ramps to match existing VOUT, preventing reverse current |
| Input voltage regulation loop | Enables backup power hold-up by regulating VIN when primary supply sags or disconnects |
| Easy paralleling capability | Multiple LTC3623IUDD#TRPBF units can share load via synchronized switching and current-sharing resistors |
Applications
| Tracking Supply or DDR Memory Supply | ASIC Substrate Biasing |
|---|---|
Use Scenario: Providing tightly regulated, low-noise auxiliary voltage that tracks a master rail during power sequencing in DDR4/DDR5 memory subsystems. IC Role / Device Role / Timing Role: Synchronous buck controller delivering ±5A with <1% VOUT tracking error and <20µs PGOOD blanking for robust memory initialization. Use Value: Eliminates need for discrete tracking circuits; supports JEDEC-compliant VPP/VDDQ ramp profiles via ISET soft-start. |
Use Scenario: Generating negative or ultra-low positive substrate bias voltages for high-performance ASICs requiring dynamic body biasing. IC Role / Device Role / Timing Role: Programmable buck regulator operating down to 0V output, with precision ISET current source enabling sub-10mV regulation setpoint resolution. Use Value: Enables fine-grained VBS tuning across process corners; IMON-based current monitoring supports real-time leakage characterization. |
| Point-of-Load (POL) Power Supply | Thermo Electric Cooler (TEC) Systems |
Use Scenario: Delivering localized 3.3V/5V/12V power near FPGA or processor cores with minimal IR drop and fast transient response. IC Role / Device Role / Timing Role: High-efficiency, current-mode POL regulator with 400kHz–4MHz frequency agility and CCM/DCM mode selection for optimal light-load efficiency. Use Value: Achieves >94% efficiency at 1A load (12V→3.3V); 30ns minimum on-time supports high step-down ratios without dropout. |
Use Scenario: Bidirectional current control for thermoelectric coolers requiring precise ±5A symmetric drive and low-output-ripple regulation. IC Role / Device Role / Timing Role: Dual-quadrant capable buck regulator with matched top/bottom RDS(ON) (60mΩ/30mΩ) and accurate current mirroring via IMON. Use Value: Enables closed-loop TEC temperature control with <±2% current accuracy; Silent Switcher® minimizes noise coupling into analog sensor paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621IUDD#TRPBF | Single-channel, ±3A output; no IMON pin; no VIN_REG; same package and pinout except missing IMON/VIN_REG functions | Limited to simpler POL needs without current monitoring or input regulation | Select when ±3A suffices and cable compensation, OCL, or backup hold-up are unnecessary |
| MP2451DT-LF-Z | 3A rated, fixed 2MHz frequency, no ISET programming, no IMON, no MODE/SYNC, smaller 8-pin SOIC package | Cost-sensitive, space-constrained DC/DC with fixed VOUT and no advanced monitoring | Choose for basic 12V→3.3V conversion where design simplicity and BOM cost outweigh programmability and diagnostics |
Compared with LTC3621IUDD#TRPBF and MP2451DT-LF-Z, the LTC3623IUDD#TRPBF provides higher current (±5A vs ±3A/3A), full VOUT programmability, integrated current monitoring, and input voltage regulation - making it uniquely suited for high-fidelity, feature-rich POL and TEC applications demanding precision, diagnostics, and system-level control.
Availability
LTC3623IUDD#TRPBF is available at Aetrix Electronics and suitable for point-of-load power supplies, DDR memory biasing, and thermoelectric cooler driver circuits requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term industrial lifecycle support.
Supply support for LTC3623IUDD#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, serving industrial, automotive, communications, and healthcare markets.
The LTC3623IUDD#TRPBF belongs to Linear's high-efficiency monolithic buck regulator product line, engineered specifically for demanding point-of-load, battery-powered, and low-EMI applications where precision, integration, and thermal robustness are critical.
FAQ
What is the guaranteed operating temperature range for the LTC3623IUDD#TRPBF?
The LTC3623IUDD#TRPBF is specified and tested over a –40°C to +125°C junction temperature range. This industrial-grade rating is explicitly guaranteed per the "I" grade in the part number and confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Can the LTC3623IUDD#TRPBF operate with a 3.3V input supply?
No - the LTC3623IUDD#TRPBF requires SVIN ≥ 4V for internal bias circuitry operation. While PVIN can go as low as 1.5V, SVIN must remain ≥ 4V; therefore, a 3.3V-only input cannot power the LTC3623IUDD#TRPBF. A minimum 4V SVIN rail (e.g., derived from a separate LDO) is mandatory.
How does the IMON pin function in the LTC3623IUDD#TRPBF?
The IMON pin delivers a 21µA-per-ampere scaled replica of the average output current (IOUT). When a resistor RLIM is placed from IMON to GND, the resulting voltage triggers current limiting at 2.35V. It also enables cable drop compensation by injecting IMON current into the ISET resistor network - a feature unique to the LTC3623IUDD#TRPBF among its peers.
Is the LTC3623IUDD#TRPBF pin-compatible with the LTC3623EUDD#TRPBF?
Yes - both the LTC3623IUDD#TRPBF and LTC3623EUDD#TRPBF use identical 24-lead 3mm × 5mm QFN packaging and share identical pinout, electrical functionality, and footprint. The only difference is the guaranteed temperature range: "I" grade (–40°C to +125°C) vs "E" grade (–40°C to +85°C).
Does the LTC3623IUDD#TRPBF support synchronization to an external clock?
Yes - the MODE/SYNC pin accepts an external clock signal to synchronize the LTC3623IUDD#TRPBF's switching frequency. For reliable locking, the external clock must fall within ±30% of the free-running frequency set by the RT resistor, and the part automatically enters forced continuous conduction mode during synchronization.
LTC3623IUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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):
- 1.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 14.5V
- Current - Output:
- 5A
- Frequency - Switching:
- 400kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LTC3623IUDD#TRPBF FAQ
1.How can I place an order for LTC3623IUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3623IUDD#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 LTC3623IUDD#TRPBF reliable?
The price and inventory of LTC3623IUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3623IUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3623IUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3623IUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3623IUDD#TRPBF?
LTC3623IUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3623IUDD#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 LTC3623IUDD#TRPBF?
For technical support, including LTC3623IUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3623IUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3623IUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3623IUDD#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 LTC3623IUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3623IUDD#TRPBF?
All LTC3623IUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3623IUDD#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 LTC3623IUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3623IUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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