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Analog Devices Inc. LTC3623IUDD#PBF
- Part No.:
- LTC3623IUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3623IUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LTC3623IUDD#PBF 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 VOUT programming via a precise 50µA ISET current source, adjustable switching frequency from 400kHz to 4MHz, 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#PBF datasheet, LTC3623IUDD#PBF pinout, LTC3623IUDD#PBF application, or LTC3623IUDD#PBF equivalent, key selection considerations include its ±1% ISET accuracy, ±5% output current monitor fidelity, programmable wire-drop compensation, Silent Switcher® architecture for EMI reduction, and guaranteed operation across –40°C to 125°C junction temperature.
Technical Context
The LTC3623IUDD#PBF employs a constant-frequency/controlled on-time current-mode architecture that delivers fast transient response and stable regulation across wide VOUT ranges (0V to VIN – 0.5V). Its error amplifier compares VOUT directly against the ISET voltage, enabling tight load regulation (0.05%) and accurate tracking.
It integrates dual independent supply rails: SVIN powers control circuitry (4V–15V), while PVIN supplies power switches (1.5V–15V), supporting dual Li-Ion or 5V/12V rail inputs. The device supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), selectable via MODE/SYNC pin, and includes VIN overvoltage lockout (16.8V) and internal 5V INTVCC LDO regulator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0V to VIN – 0.5V; enables ultra-low dropout and flexible biasing for ASIC substrates or TEC systems. |
| ISET Accuracy | ±1% at 25°C; ensures precise single-resistor output programming without trimming. |
| Switching Frequency | 400kHz–4MHz via RT resistor; allows optimization of inductor size vs. efficiency trade-off. |
| Output Current | ±5A continuous; supported by integrated 60mΩ top / 30mΩ bottom N-MOSFETs. |
| Efficiency | Up to 96%; achieved via low RDS(ON), optimized gate drive, and DCM/CCM mode selection. |
| Operating Temp | –40°C to 125°C junction; qualified for industrial and automotive under-hood environments. |
| Package | 24-lead 3mm × 5mm QFN with exposed thermal pad; enables compact layout and efficient heat dissipation. |
Pinout & Package
24-lead (3mm × 5mm) plastic QFN package with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical performance. Pin functions are validated per Linear Technology (Analog Devices) datasheet Rev. FA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Error amp positive input & 50µA reference source | Directly sets VOUT; external resistor or voltage source programs output from 0V to VIN–0.5V. |
| PGOOD (2) | Open-drain power-good indicator | Pulled low if PGFB < 0.54V or > 0.63V; enables system sequencing and fault detection. |
| RUN (3) | Enable/shutdown control input | Logic-high (>1.45V) enables full operation; <1V disables switching; <0.4V shuts down entire IC. |
| GSNS (4) | Ground reference for RUN/PGOOD/MODE | Must connect to PGND for positive-VOUT applications; defines local ground for critical analog pins. |
| PVIN (5,16) | Main power input to top MOSFET | Supports 1.5V–15V; decoupling required close to pins; enables dual-battery or 12V rail operation. |
| SW (6,15) | Switch node connection | Drives external inductor; swings from ~–0.3V to PVIN; requires low-inductance layout. |
| PGND (9–12,25) | Power ground return path | Multiple pins + exposed pad minimize IR drop and improve thermal resistance (θJA = 36°C/W). |
| VOUT (13) | Regulated output voltage node | Negative input to error amp; directly servoed to match ISET voltage for precision regulation. |
| SVIN (17) | Signal supply for bias circuitry | 4V–15V range powers internal logic; independent of PVIN to support wide input flexibility. |
| BOOST (18) | Floating supply for top MOSFET gate driver | Connected to bootstrap capacitor; swings up to PVIN + INTVCC for full N-MOSFET enhancement. |
| INTVCC (19) | Internal 5V LDO output | Powers gate drivers and control circuits; requires ≥1µF ceramic bypass to PGND. |
| PGFB (20) | Power-good feedback divider input | Monitors VOUT via resistor divider; threshold window (0.54V–0.63V) defines PGOOD assertion. |
| IMON (21) | Current monitor output | Sources 21µA/A of IOUT; used for current limiting, cable drop compensation, or telemetry. |
| VIN_REG (22) | Input voltage regulation control | Enables backup power hold-up by regulating PVIN when input sags below setpoint (1.45V threshold). |
| RT (23) | Frequency programming input | Resistor-to-GND sets fSW = 3.32×10¹⁰ / RRT; tie to INTVCC for 1MHz default. |
| ITH (24) | Error amp output & compensation node | Controls peak inductor current; supports internal (tie to INTVCC) or external R/C compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces EMI emissions via symmetrical layout and integrated hot-loop capacitors - critical for EMC-compliant portable designs. |
| Programmable wire-drop compensation | Uses IMON current injected into ISET resistor to offset voltage drop across PCB traces or cables - maintains load-side regulation accuracy. |
| Input voltage regulation loop | Enables backup power functionality: when VIN_REG falls below 1.45V, controller reduces IOUT to sustain input rail during brownout or battery sag. |
| Easy paralleling support | Shared ISET and MODE/SYNC pins allow multiple LTC3623IUDD#PBF units to be synchronized and current-shared without external controllers. |
| Pre-biased soft-start | Starts safely into pre-charged VOUT by holding switches off until ISET ramps to match VOUT, preventing reverse current flow. |
Applications
| Tracking Supply or DDR Memory Supply | ASIC Substrate Biasing |
|---|---|
Use Scenario: Providing tightly regulated, low-noise auxiliary voltage for DDR3/DDR4 memory termination or VTT tracking in servers and telecom equipment. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering ±5A at 0.75V–1.5V with <0.05% load regulation and fast transient response to memory burst currents. Use Value: Maintains signal integrity and timing margins by minimizing VOUT droop during high di/dt load steps - enabled by current-mode control and 50µA ISET accuracy. | Use Scenario: Generating negative or ultra-low positive bias voltages for ASIC substrate wells or I/O banks in FPGA-based systems. IC Role / Device Role / Timing Role: Programmable buck converter operating down to 0V output, supporting substrate biasing schemes requiring precise VBULK control. Use Value: Eliminates need for external DACs or op-amps by allowing direct ISET voltage programming - simplifies BOM and improves long-term drift stability. |
| Point-of-Load (POL) Power Supply | Thermo Electric Cooler (TEC) Systems |
Use Scenario: Delivering localized 3.3V/5V/12V power near high-performance processors or FPGAs in industrial embedded systems. IC Role / Device Role / Timing Role: High-efficiency monolithic buck regulator with integrated MOSFETs, operating from 4V–15V input and delivering up to ±5A with minimal external components. Use Value: Reduces solution footprint and thermal density via 3mm × 5mm QFN package and 96% peak efficiency - critical for space-constrained POL designs. | Use Scenario: Driving bidirectional current through thermoelectric coolers in precision temperature-controlled sensors or laser modules. IC Role / Device Role / Timing Role: Bipolar-capable buck regulator supporting ±5A output with programmable current limit and real-time IMON telemetry. Use Value: Enables closed-loop TEC control using IMON-sourced current feedback and programmable ILIM - avoids external sense resistors and improves thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3621IUFD#PBF | Single-output, 3A rated, same 3mm × 4mm QFN package; lacks IMON, VIN_REG, and dual-supply (PVIN/SVIN) separation. | Lower current capacity and no input regulation loop - suitable only for simpler POL where 3A suffices and backup hold-up is unnecessary. | Select when cost and board area are prioritized over current headroom and advanced protection features. |
| MP2451DT-LF-Z | 3A monolithic buck, 4.5V–36V input, no ISET programming - uses feedback resistor divider; no IMON, no VIN_REG, no Silent Switcher. | Broader input range but lower precision and higher EMI - appropriate for non-sensitive industrial loads where ±2% VOUT tolerance is acceptable. | Choose for high-input-voltage applications (e.g., 24V bus) where extended VIN range outweighs regulation accuracy and EMI performance. |
Compared with LTC3621IUFD#PBF and MP2451DT-LF-Z, the LTC3623IUDD#PBF provides higher output current (±5A vs. 3A), superior VOUT programming accuracy (±1% ISET vs. resistor-divider tolerance), integrated current monitoring, and dual-rail input architecture - making it uniquely suited for demanding, thermally constrained, or safety-critical POL and TEC applications.
Availability
LTC3623IUDD#PBF is available at Aetrix Electronics and suitable for point-of-load (POL) power supplies, DDR memory tracking, ASIC substrate biasing, and thermo-electric cooler (TEC) systems requiring stable component supply, extended temperature operation, and high-current density regulation.
Supply support for LTC3623IUDD#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, Inc. (formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and medical markets.
The LTC3623IUDD#PBF belongs to the LTC® monolithic synchronous buck regulator product line, engineered for high-efficiency, low-EMI, and precision point-of-load conversion in thermally demanding and noise-sensitive applications.
FAQ
What is the guaranteed operating temperature range for the LTC3623IUDD#PBF?
The LTC3623IUDD#PBF is fully specified and guaranteed over a junction temperature range of –40°C to 125°C. This "I" grade qualification is confirmed by design, characterization, and statistical process controls - unlike the "E" grade (0°C to 85°C) - making LTC3623IUDD#PBF suitable for industrial and extended-temperature environments where ambient conditions exceed standard commercial limits.
How does the ISET pin enable single-resistor VOUT programming in the LTC3623IUDD#PBF?
The LTC3623IUDD#PBF integrates a precision 50µA current source referenced to the ISET pin. Connecting an external resistor RISET from ISET to PGND sets VOUT = 50µA × RISET, enabling 0V to VIN – 0.5V output with ±1% accuracy. Alternatively, driving ISET with an external voltage source (0V to VIN) directly programs VOUT, with the 50µA source sinking into the source.
Can the LTC3623IUDD#PBF operate with separate input rails for power and control circuitry?
Yes. The LTC3623IUDD#PBF features dual input rails: PVIN (1.5V–15V) powers the high-current MOSFETs, while SVIN (4V–15V) supplies the internal bias and control circuitry. This separation allows operation from dual Li-Ion batteries (PVIN = 2.7V–8.4V, SVIN = 4V–8.4V) or from a 12V main rail (PVIN) and isolated 5V control rail (SVIN), improving system robustness and sequencing flexibility.
What is the purpose of the VIN_REG pin on the LTC3623IUDD#PBF?
The VIN_REG pin enables input voltage regulation for backup power applications. When tied to a resistor divider from PVIN, it monitors input voltage. If VIN_REG drops below 1.45V, the LTC3623IUDD#PBF reduces inductor current to prevent further PVIN sag - effectively acting as a controlled current sink to hold up a weak or battery-backed input rail during brownout events.
Does the LTC3623IUDD#PBF support synchronization to an external clock?
Yes. The MODE/SYNC pin accepts an external clock signal to synchronize the LTC3623IUDD#PBF's switching frequency. For reliable locking, the external clock must fall within ±30% of the free-running frequency set by the RT resistor. During synchronization, the device operates in forced continuous conduction mode (CCM), ensuring deterministic timing for noise-sensitive systems.
LTC3623IUDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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):
- 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#PBF FAQ
1.How can I place an order for LTC3623IUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3623IUDD#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 LTC3623IUDD#PBF reliable?
The price and inventory of LTC3623IUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3623IUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3623IUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3623IUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3623IUDD#PBF?
LTC3623IUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3623IUDD#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 LTC3623IUDD#PBF?
For technical support, including LTC3623IUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3623IUDD#PBF requirements.
6.How does Aetrix verify that LTC3623IUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3623IUDD#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 LTC3623IUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3623IUDD#PBF?
All LTC3623IUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3623IUDD#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 LTC3623IUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3623IUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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