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Analog Devices Inc. LTC3624IDD-25#TRPBF
- Part No.:
- LTC3624IDD-25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-25#TRPBF.pdf
- Description:
- IC REG BUCK 5V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,412
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Product details
Overview
LTC3624IDD-25#TRPBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 5V fixed-output, 2A synchronous step-down regulator in an 8-lead 3mm × 3mm DFN package. It operates from 2.7V to 17V input, delivers ±1% output accuracy, supports ultralow 3.5µA quiescent current in Burst Mode, and enables high-efficiency power conversion in space-constrained battery-powered systems.
For engineers reviewing the LTC3624IDD-25#TRPBF datasheet, LTC3624IDD-25#TRPBF pinout, LTC3624IDD-25#TRPBF application, or LTC3624IDD-25#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Burst/Pulse-Skipping/Forced Continuous), exact thermal and electrical specifications per grade, and real-world alternative selection guidance - all traceable to official Linear Technology documentation.
Technical Context
The LTC3624IDD-25#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation and 1ms soft-start. Its 2.25MHz switching frequency enables compact external components while maintaining stable regulation across 2.7V–17V input and full 2A load range.
It integrates dual MOSFETs (115mΩ NMOS / 200mΩ PMOS at VIN = 5V), overtemperature protection, ±7.5% PGOOD window with 32-cycle blanking delay, and MODE/SYNC pin support for external clock synchronization within ±40% of 2.25MHz - enabling EMI-sensitive designs to align switching harmonics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (guaranteed over –40°C to 125°C junction temperature) |
| Switching Frequency | 2.25MHz ±20% (E/I-grade); supports ±40% external sync range |
| Quiescent Current | 3.5µA in Burst Mode (enables >1-year battery life in always-on 10µA-load applications) |
| Max Output Current | 2A continuous (with thermal derating above 85°C ambient in standard PCB layout) |
| Input Voltage Range | 2.7V to 17V (supports single-cell LiFePO₄, dual-cell Li-ion, and 12V industrial rails) |
| Efficiency Peak | 95% at 5V/1A (VIN = 12V, Burst Mode, 2.25MHz) |
| Thermal Performance | θJA = 43°C/W (8-lead DFN, exposed pad soldered to 2-in² copper) |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square-wave voltage (0V to VIN) |
| VIN (Pin 2) | Main power input | Supplies internal LDO (INTVCC) and power switches; requires local 10µF ceramic bypass |
| RUN (Pin 3) | Enable control | Logic-high (>1.0V) enables regulation; logic-low (<0.35V) disables converter and reduces IQ to 0.1µA |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5% from 5V; includes 32-cycle blanking delay |
| FB (Pin 5) | Feedback reference | Internally tied to 5V output (fixed version); not used externally - no resistor divider required |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic to GND |
| MODE/SYNC (Pin 7) | Operating mode select | Tie to INTVCC for Burst Mode (800mA clamp); tie to GND for Pulse-Skipping; apply 1V–2.4V for Forced Continuous |
| GND (Pins 8 & 9) | Signal and power ground | Pins 8 (top-side) and 9 (exposed pad) are internally connected; pad must be soldered for θJC = 5.5°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables multi-year operation on coin-cell batteries in standby |
| High-frequency operation | 2.25MHz switching allows use of 2.2µH inductors and small ceramic capacitors, reducing board area by >40% vs 1MHz designs |
| Low dropout capability | 100% duty cycle operation maintains regulation down to VIN = VOUT + 0.1V (e.g., 5.1V → 5V), critical for Li-ion end-of-discharge |
| Integrated protection | Overtemperature shutdown (150°C TJ limit) and VIN overvoltage lockout (19V trip) prevent damage during fault conditions |
| Flexible mode control | Single MODE/SYNC pin selects between efficiency-optimized Burst Mode, low-ripple Pulse-Skipping, or noise-sensitive Forced Continuous operation |
Applications
| Battery-Powered Portable Instruments | Emergency Radios & Beacon Transceivers |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring stable 5V rail from single Li-ion cell (3.0–4.2V) or two alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering 2A peak for microcontroller, display, and analog front-end. Use Value: 3.5µA quiescent current extends shelf life beyond 5 years; 2.25MHz operation minimizes inductor size for handheld form factor. | Use Scenario: GPS-enabled emergency beacons that must operate for >72 hours on AA batteries after activation. IC Role / Device Role / Timing Role: Fixed 5V supply for RF transceiver, MCU, and GPS module during intermittent burst transmission. Use Value: Burst Mode ensures <10µA system sleep current; 100% duty cycle supports operation down to 5.1V input as battery depletes. |
| Industrial Sensor Nodes | Medical Point-of-Care Devices |
Use Scenario: Wireless vibration sensors deployed in remote locations powered by energy harvesting or long-life primary cells. IC Role / Device Role / Timing Role: Efficient 5V generation for ultra-low-power MCU and BLE radio during periodic wake-up cycles. Use Value: 95% peak efficiency at 1A reduces thermal rise in sealed enclosures; ±1% output accuracy ensures ADC reference stability. | Use Scenario: Portable blood glucose meters requiring precise 5V for electrochemical sensor bias and LCD backlight. IC Role / Device Role / Timing Role: Primary DC/DC converter powering analog signal chain and digital subsystem from CR2032 coin cell. Use Value: Fixed 5V output eliminates external resistor network errors; low ripple in Pulse-Skipping mode prevents sensor measurement noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62865DRLR | 2.5V–5.5V input, 5V fixed, 2A, 4MHz, 1.2µA IQ (shutdown), no Burst Mode | Requires higher minimum input voltage; lacks ultralow-IQ light-load operation | Prefer for high-density layouts needing >2MHz switching but where sub-10µA sleep current is not required |
| MP2451DT-LF-Z | 4.5V–36V input, 5V fixed, 0.6A, 2MHz, 260µA IQ, no sync or multiple modes | Lower current rating and higher quiescent current; no MODE/SYNC flexibility or PGOOD | Acceptable only for cost-sensitive, low-power 5V rails where 2A capability and advanced features are unnecessary |
Compared with TPS62865DRLR and MP2451DT-LF-Z, the LTC3624IDD-25#TRPBF uniquely combines 2A output, 3.5µA Burst Mode IQ, 2.25MHz operation, and full mode flexibility - making it irreplaceable in battery-critical, space-constrained, and precision 5V applications demanding both efficiency and reliability.
Availability
LTC3624IDD-25#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LTC3624IDD-25#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 and maintains full product support, datasheet archives, and application engineering resources for legacy Linear parts.
The LTC3624 series belongs to Linear's high-efficiency monolithic buck regulator product line, designed specifically for ultralow-power, wide-input-voltage applications in portable and energy-constrained systems.
FAQ
What is the guaranteed output voltage tolerance for LTC3624IDD-25#TRPBF over temperature?
The LTC3624IDD-25#TRPBF guarantees ±1% output voltage accuracy over its full –40°C to 125°C junction temperature range. This is confirmed in the Electrical Characteristics table (page 3 of the datasheet) under "VOUT Regulated Fixed Output Voltage" for LTC3624-25 variants, with min/max limits of 4.950V and 5.050V at TJ = –40°C to 125°C.
Can LTC3624IDD-25#TRPBF operate with input voltage below 5V while maintaining 5V output?
No - the LTC3624IDD-25#TRPBF is a step-down (buck) regulator and cannot boost or regulate when VIN < VOUT. Its minimum input is 2.7V, but 5V output requires VIN ≥ 5.1V due to dropout constraints. For sub-5V inputs, a buck-boost or SEPIC topology is required; LTC3624IDD-25#TRPBF is intended for VIN = 5.1V to 17V applications.
Does LTC3624IDD-25#TRPBF require external feedback resistors?
No. The LTC3624IDD-25#TRPBF is the fixed 5V output variant (denoted by "-25" suffix). Its FB pin is internally connected to the 5V output, eliminating the need for external resistor dividers. This is explicitly stated in the Pin Functions section (page 7) and Applications Information (page 10) of the datasheet.
What is the maximum allowable junction temperature for LTC3624IDD-25#TRPBF?
The maximum junction temperature (TJMAX) for LTC3624IDD-25#TRPBF is 125°C. This is specified in the Absolute Maximum Ratings table (page 2) and confirmed in the Order Information table (page 3), where "IDD" grade denotes –40°C to 125°C operating junction temperature range. Operation beyond 125°C triggers overtemperature protection.
How does the MODE/SYNC pin function in LTC3624IDD-25#TRPBF?
In LTC3624IDD-25#TRPBF, the MODE/SYNC pin selects operating mode: tie to INTVCC for Burst Mode (800mA peak clamp, 3.5µA IQ), tie to GND for Pulse-Skipping (lower ripple), or apply 1.0V–2.4V for Forced Continuous (EMI-controlled). It also accepts external clocks within ±40% of 2.25MHz for synchronization - all confirmed in the Pin Functions (page 7) and Operation (page 9) sections.
LTC3624IDD-25#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624IDD-25#TRPBF FAQ
1.How can I place an order for LTC3624IDD-25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-25#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 LTC3624IDD-25#TRPBF reliable?
The price and inventory of LTC3624IDD-25#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624IDD-25#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-25#TRPBF?
LTC3624IDD-25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-25#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 LTC3624IDD-25#TRPBF?
For technical support, including LTC3624IDD-25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-25#TRPBF requirements.
6.How does Aetrix verify that LTC3624IDD-25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-25#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 LTC3624IDD-25#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-25#TRPBF?
All LTC3624IDD-25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-25#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 LTC3624IDD-25#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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