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Analog Devices Inc. LTC3623EUDD#PBF
- Part No.:
- LTC3623EUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3623EUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 5A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,882
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Product details
Overview
LTC3623EUDD#PBF from Analog Devices is a monolithic synchronous buck regulator with single-resistor programmable output voltage (0V to VIN–0.5V), ±5A output current capability, and integrated 60mΩ/30mΩ N-MOSFETs. It operates from 1.5V PVIN and 4V SVIN inputs, supports 400kHz–4MHz switching frequency via RT resistor, and delivers up to 96% efficiency in point-of-load power delivery for ASIC biasing and portable instrumentation.
For engineers reviewing the LTC3623EUDD#PBF datasheet, LTC3623EUDD#PBF pinout, LTC3623EUDD#PBF application, or LTC3623EUDD#PBF equivalent, key selection considerations include its ISET-programmable VOUT architecture, dual-input rail support (PVIN/SVIN), Silent Switcher® noise reduction, ±1% ISET accuracy, and 24-lead 3mm × 5mm QFN package with exposed thermal pad.
Technical Context
The LTC3623EUDD#PBF implements a constant-frequency, current-mode control architecture with internal one-shot timer and phase-locked on-time servo, enabling fast transient response across wide input/output ratios. Its error amplifier compares VOUT directly against the ISET pin voltage, while valley-current sensing via bottom MOSFET RDS(ON) enables precise load regulation.
It features dual supply rails-PVIN (1.5V–15V) powers the power switches, while SVIN (4V–15V) supplies bias circuitry-enabling operation from dual Li-Ion batteries or 5V/12V system rails. The device supports discontinuous (DCM) and forced continuous (CCM) modes via MODE/SYNC pin, and includes VIN overvoltage lockout (16.8V) and programmable output current limiting via IMON pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0V to VIN – 0.5V; enables ultra-low dropout and negative-tracking configurations |
| IOUT Max | ±5A; supported by integrated 60mΩ top / 30mΩ bottom N-MOSFETs |
| fSW Range | 400kHz to 4MHz; set by RT resistor; higher fSW allows smaller inductors |
| ISET Accuracy | ±1% at 25°C; enables precise single-resistor VOUT programming |
| Efficiency | Up to 96%; achieved via low RDS(ON), optimized gate drive, and CCM/DCM mode selection |
| Input Voltage | PVIN: 1.5V–15V; SVIN: 4V–15V; supports dual Li-Ion and 5V/12V system rails |
| Shutdown IQ | <1µA; enables battery-critical low-power standby in portable equipment |
Pinout & Package
Package: 24-lead 3mm × 5mm plastic QFN with exposed thermal pad (Pin 25 = PGND); requires soldering of exposed pad to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Error amplifier positive input / 50µA reference source | Programs VOUT via external resistor to GND; also accepts external voltage drive (0–VIN) |
| PGOOD (2) | Open-drain power-good status output | Pulled low when PGFB < 0.54V or > 0.63V; referenced to GSNS |
| RUN (3) | Enable/disable control input | >1.45V enables full operation; <1V disables switching; <0.4V shuts down entire IC |
| GSNS (4) | Ground reference for RUN/PGOOD/MODE/SYNC | Connect to PGND for positive-VOUT applications; provides common-mode reference |
| PVIN (5,16) | Main power input for top MOSFET drain | Operates from 1.5V–15V; must be decoupled locally to PGND |
| SW (6,15) | Switch node connection to external inductor | Swings from ~–0.3V to PVIN; critical for layout and EMI control |
| PGND (9,10,11,12,25) | Power ground return path | Return for internal MOSFETs and input/output capacitors; exposed pad (25) must be soldered |
| VOUT (13) | Regulated output voltage node | Negative input of error amplifier; directly regulated to match ISET voltage |
| SVIN (17) | Signal input for bias circuitry | Must be ≥4V; powers internal LDO (INTVCC) and control logic |
| BOOST (18) | Floating supply for top MOSFET gate driver | Connected to bootstrap capacitor (+); swings from INTVCC–0.3V to PVIN+INTVCC |
| INTVCC (19) | Internal 5V LDO output | Powers gate drivers and control circuits; requires ≥1µF ceramic bypass to PGND |
| PGFB (20) | Power-good feedback input | Resistor divider from VOUT sets PGOOD window (0.54V–0.63V) |
| IMON (21) | Output current monitor / limit programming | Sinks 21µA per amp of IOUT; 2.35V threshold enables programmable current limit |
| VIN_REG (22) | Input voltage regulation control | Tie to resistor divider from VIN to enable input-regulation loop for backup supplies |
| RT (23) | Switching frequency programming | Resistor to GND sets fSW (400kHz–4MHz); tie to INTVCC for 1MHz default |
| ITH (24) | Error amplifier output / compensation node | Controls current comparator threshold; supports internal (tie to INTVCC) or external compensation |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces EMI emissions via symmetrical layout and integrated hot-loop capacitors |
| Single-resistor VOUT programming | Eliminates feedback resistors; uses accurate 50µA ISET current source for 0V–VIN–0.5V range |
| Dual-input rail support (PVIN/SVIN) | Enables high-efficiency operation from low-voltage battery stacks (e.g., dual Li-Ion) while maintaining stable bias |
| Programmable wire-drop compensation | Uses IMON current injected into ISET resistor to offset cable resistance losses at remote loads |
| Easy paralleling capability | Supports multiple LTC3623EUDD#PBF units for higher current and improved thermal spreading without external clock sync |
| Pre-biased soft-start | Prevents reverse current flow during startup into pre-charged VOUT by holding switches off until ISET ≥ VOUT |
Applications
| ASIC Substrate Biasing | Point-of-Load (POL) Power Supply |
|---|---|
Use Scenario: Providing tightly regulated, low-noise bias voltage to ASIC core or I/O domains in high-speed digital systems. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering ±5A at sub-1V to 3.3V with <0.05% load regulation. Use Value: Maintains stable ASIC operation under dynamic load transients using current-mode control and 30ns minimum on-time. | Use Scenario: Delivering localized power near FPGAs, DSPs, or memory modules on dense PCBs with limited space. IC Role / Device Role / Timing Role: Compact, high-efficiency buck regulator in 3mm × 5mm QFN, minimizing board area and thermal footprint. Use Value: Achieves 96% peak efficiency and fast transient response with integrated MOSFETs and internal compensation. |
| Portable Instruments | Thermo Electric Cooler (TEC) Systems |
Use Scenario: Powering handheld test equipment, medical sensors, or field-deployable analyzers from battery packs. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting dual Li-Ion (up to 8.4V) or 12V inputs with <1µA shutdown current. Use Value: Extends battery life via DCM mode at light loads and ultra-low quiescent current in shutdown. | Use Scenario: Driving bidirectional TEC elements requiring precise, low-ripple ±5A current control for temperature stabilization. IC Role / Device Role / Timing Role: Synchronous buck regulator configured for bipolar output via external H-bridge or complementary control. Use Value: Delivers tight VOUT regulation (<±0.05%) and programmable current limit (via IMON) to protect TEC elements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3638EUD#PBF | Lower 3A output current; 2.5V–5.5V input range; no PVIN/SVIN separation; fixed 1.2V VOUT option | Better suited for low-power, single-rail 3.3V/5V systems where size and cost outweigh high-current needs | Select when ≤3A output and simplified single-input design are acceptable trade-offs for reduced BOM count |
| MP2451DT-LF-Z | 3A output; 4.5V–28V input; external MOSFETs required; no ISET programming; lower integration | Targeted at industrial 12V/24V rails where higher VIN tolerance and ruggedness are prioritized over compactness | Choose when operating above 15V VIN or requiring extended temperature grade beyond –40°C to 125°C |
Compared with LTC3638EUD#PBF and MP2451DT-LF-Z, the LTC3623EUDD#PBF uniquely combines ±5A capability, dual-rail input flexibility (PVIN/SVIN), and single-resistor VOUT programming in a thermally enhanced 3mm × 5mm QFN-making it optimal for high-density, battery-powered POL designs demanding precision and efficiency.
Availability
LTC3623EUDD#PBF is available at Aetrix Electronics and suitable for ASIC substrate biasing, portable instrumentation, point-of-load power delivery, and thermo-electric cooler systems requiring stable component supply and long-term production continuity.
Supply support for LTC3623EUDD#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3623EUDD#PBF belongs to the Linear Technology µModule® and monolithic regulator product line, engineered for high-efficiency, low-noise, and space-constrained point-of-load applications requiring precision regulation and robust transient response.
FAQ
What is the recommended input voltage range for LTC3623EUDD#PBF?
The LTC3623EUDD#PBF requires two separate input rails: PVIN (1.5V to 15V) powers the power switches, and SVIN (4V to 15V) supplies the internal bias circuitry. This dual-rail architecture enables operation from dual Li-Ion batteries (e.g., 6V–8.4V) or standard 5V/12V system rails. Exceeding 15V on either rail risks triggering VIN overvoltage lockout at 16.8V.
How does the ISET pin program the output voltage in LTC3623EUDD#PBF?
The LTC3623EUDD#PBF features an accurate 50µA current source on the ISET pin. Connecting an external resistor RISET from ISET to PGND sets VOUT = 50µA × RISET, enabling 0V to VIN–0.5V output programming. Alternatively, driving ISET with an external voltage source (0–VIN) directly defines VOUT, with the internal current source sinking 50µA.
Can LTC3623EUDD#PBF operate in discontinuous conduction mode (DCM)?
Yes, the LTC3623EUDD#PBF automatically enters DCM at light loads when the MODE/SYNC pin is tied to GSNS. In DCM, the bottom MOSFET turns off when inductor current reaches zero, improving light-load efficiency. Tying MODE/SYNC to INTVCC forces continuous conduction mode (CCM) for lowest output ripple across all loads.
What is the purpose of the IMON pin on LTC3623EUDD#PBF?
IMON provides a 21µA-per-amp scaled replica of output current, enabling real-time monitoring and programmable current limiting. Placing a resistor RLIM from IMON to PGND creates a voltage VIMON = 21µA × IOUT; when VIMON exceeds 2.35V, the LTC3623EUDD#PBF limits IOUT. IMON can also inject current into the ISET resistor for cable drop compensation.
Does LTC3623EUDD#PBF support synchronization to an external clock?
Yes, applying an external clock signal to the MODE/SYNC pin synchronizes the LTC3623EUDD#PBF's switching frequency to that clock. For reliable locking, the external clock frequency must fall within ±30% of the free-running frequency set by the RT resistor. During sync, the device operates in forced CCM regardless of MODE/SYNC DC voltage level.
LTC3623EUDD#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)
LTC3623EUDD#PBF FAQ
1.How can I place an order for LTC3623EUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3623EUDD#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 LTC3623EUDD#PBF reliable?
The price and inventory of LTC3623EUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3623EUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3623EUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3623EUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3623EUDD#PBF?
LTC3623EUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3623EUDD#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 LTC3623EUDD#PBF?
For technical support, including LTC3623EUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3623EUDD#PBF requirements.
6.How does Aetrix verify that LTC3623EUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3623EUDD#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 LTC3623EUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3623EUDD#PBF?
All LTC3623EUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3623EUDD#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 LTC3623EUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3623EUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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