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Analog Devices Inc. LTC3624EDD-25#PBF
- Part No.:
- LTC3624EDD-25#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-25#PBF.pdf
- Description:
- IC REG BUCK 5V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,076
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Product details
Overview
LTC3624EDD-25#PBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 5V fixed-output synchronous step-down regulator delivering up to 2A from 2.7V–17V input. It features 3.5µA quiescent current in Burst Mode, ±1% output accuracy, and operates in forced continuous, pulse-skipping, or Burst Mode for optimized light-load efficiency in battery-powered instrumentation.
For engineers reviewing the LTC3624EDD-25#PBF datasheet, LTC3624EDD-25#PBF pinout, LTC3624EDD-25#PBF application, or LTC3624EDD-25#PBF equivalent, key selection criteria include its 2.25MHz switching frequency, 5V fixed output with no external feedback divider, 8-lead 3mm × 3mm DFN package, and support for external clock synchronization within ±40% of nominal frequency.
Technical Context
The LTC3624EDD-25#PBF implements a constant-frequency peak-current-mode control architecture with internal compensation and 1ms soft-start. Its 2.25MHz oscillator enables compact filter design using small inductors (e.g., 3.3µH) and ceramic capacitors while maintaining stable regulation across 2.7V–17V input range.
It integrates complementary PMOS/NMOS power switches with 200mΩ/115mΩ on-resistances, supports 100% duty-cycle dropout operation, and includes overtemperature protection, VIN overvoltage lockout (19V), and PGOOD with 32-cycle blanking delay for robust system monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates need for external feedback resistors; simplifies layout and reduces BOM count. |
| Switching Frequency | 2.25MHz (±10% over temp) - enables use of sub-4µH inductors and low-ESR ceramic output capacitors for space-constrained designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on portable equipment such as emergency radios and handheld meters. |
| Max Output Current | 2A continuous - supports high-efficiency local regulation for microcontrollers, sensors, and RF modules. |
| Input Voltage Range | 2.7V to 17V - accommodates single-cell Li-ion (with boost), multi-cell alkaline, or wide-range industrial supplies. |
| Efficiency Peak | 95% at 1A load, VIN=12V, VOUT=5V - minimizes thermal stress and enables fanless operation in sealed enclosures. |
| PGOOD Accuracy | ±7.5% window with 32-cycle delay - ensures reliable power sequencing without false triggers during transient load steps. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square-wave voltage; must be routed with minimal loop area. |
| VIN (Pins 2, 3) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side PMOS gate driver; requires local 10µF ceramic bypass. |
| RUN (Pin 5) | Enable control | Active-high logic input; <0.35V disables regulator and reduces IQ to 0.1µA; must not float. |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output pulled low when VOUT deviates >±7.5%; includes 32-cycle blanking to reject transient excursions. |
| FB (Pin 8) | Feedback reference | Internally tied to 5V output for fixed-version parts; no external resistor required - simplifies design vs adjustable variants. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; requires ≥2.2µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 10) | Operating mode select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (1V–2.4V); also accepts external clock for sync. |
| GND (Pins 11, 12, Exposed Pad) | Signal & power ground | All grounds must connect to common low-impedance plane; exposed pad is electrically GND and critical for θJA=43°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year battery life in 10µA average-load applications like remote sensors. |
| Fixed 5V output | Eliminates external feedback network - reduces component count, layout area, and calibration uncertainty. |
| 2.25MHz switching | Permits use of 3.3µH inductors and 47µF ceramic output caps - cuts solution size by >40% vs 1MHz equivalents. |
| 100% duty-cycle operation | Maintains regulation down to VIN = VOUT + dropout loss - critical for Li-ion battery discharge down to 3.0V while powering 5V loads. |
| Integrated soft-start | 1ms internal ramp prevents inrush current and output overshoot - removes need for external timing components. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by AA/AAA batteries or single-cell Li-ion. IC Role / Device Role / Timing Role: Primary 5V system rail regulator converting variable battery voltage (0.9V–16.8V) to stable 5V for MCU, display, and analog front-end. Use Value: 3.5µA quiescent current extends shelf life and runtime; 2.25MHz operation allows ultra-compact 3.3µH inductor and 47µF ceramic cap solution. | Use Scenario: Self-contained emergency communication devices requiring long-term storage and instant activation. IC Role / Device Role / Timing Role: Always-on 5V supply for microcontroller wake-up circuitry and RF transceiver bias, drawing <10µA in standby. Use Value: Zero-current shutdown (<0.1µA) preserves primary battery; ±1% output accuracy ensures reliable ADC reference and crystal oscillator bias. |
| Portable Medical Sensors | Industrial IoT Edge Nodes |
Use Scenario: Wearable pulse oximeters and glucose monitors operating from coin-cell or rechargeable LiPo batteries. IC Role / Device Role / Timing Role: Efficient 5V source for low-noise analog signal chain and BLE radio, supporting burst-mode data transmission. Use Value: Pulse-skipping mode (selected via MODE/SYNC = GND) delivers <20mVPP output ripple for clean sensor excitation and ADC sampling. | Use Scenario: Ruggedized wireless sensor nodes deployed in factory environments with wide-input unregulated 12V/24V rails. IC Role / Device Role / Timing Role: Point-of-load regulator converting noisy industrial supply to clean 5V for microcontroller, RS-485 transceiver, and isolated power island. Use Value: VIN OVP (19V) and overtemperature protection ensure survivability during line transients; 17V max input handles 24V surges per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62865ARGTR | 2.5V–5.5V input, 5V fixed output, 2A, 4MHz, 1.2µA IQ; smaller 1.2mm × 0.8mm WCSP package. | Not suitable for >5.5V inputs; lacks VIN OVP and 100% duty cycle - limited to USB-powered or low-VIN systems. | Select when board space is critical and input never exceeds 5.5V; verify thermal performance at 2A in tiny WCSP. |
| MP2451DT-LF-Z | 4.5V–36V input, 5V fixed output, 2A, 2MHz, 260µA IQ; requires external feedback for 5V setting. | Higher IQ reduces battery life; wider VIN range suits 24V industrial rails but adds complexity with external resistors. | Choose for cost-sensitive 24V applications where 3.5µA IQ is non-critical and layout area is less constrained. |
Compared with TPS62865ARGTR and MP2451DT-LF-Z, the LTC3624EDD-25#PBF uniquely balances ultralow IQ, wide 2.7V–17V input, fixed 5V simplicity, and robust protection - making it optimal for portable battery systems needing long shelf life and field reliability.
Availability
LTC3624EDD-25#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624EDD-25#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 full product support, datasheets, and application engineering for legacy Linear regulators including the LTC3624 family.
The LTC3624 series was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained portable electronics - emphasizing simplicity (fixed outputs), thermal robustness (exposed-pad DFN), and system-level reliability (OVP, OTP, PGOOD).
FAQ
What is the switching frequency of the LTC3624EDD-25#PBF and can it be synchronized to an external clock?
The LTC3624EDD-25#PBF operates at a nominal switching frequency of 2.25MHz with ±10% variation over temperature and supply. It supports external clock synchronization via the MODE/SYNC pin across a ±40% range (1.35MHz to 3.15MHz), enabling noise-sensitive systems to avoid EMI bands or align multiple converters for reduced beat frequencies. The sync function engages within 2–3 external clock cycles.
Does the LTC3624EDD-25#PBF require external feedback resistors to set its 5V output?
No, the LTC3624EDD-25#PBF is a fixed-output variant with internal feedback network configured for 5.0V ±1%. The FB pin is internally connected to the output, eliminating external resistors and associated layout sensitivity. This simplifies design, improves accuracy, and reduces bill-of-materials cost compared to adjustable versions like the LTC3624EDD-2#PBF.
What protection features does the LTC3624EDD-25#PBF include?
The LTC3624EDD-25#PBF integrates overtemperature protection (OTP), VIN overvoltage lockout (19V trip, 18.5V release), undervoltage lockout (2.7V startup), and PGOOD with 32-cycle blanking. It also features reverse-current protection and current-limit foldback. These protections operate without external components, ensuring robust operation in unpredictable power environments such as automotive jump-starts or industrial brownouts.
How does the MODE/SYNC pin configure operating modes on the LTC3624EDD-25#PBF?
The MODE/SYNC pin on the LTC3624EDD-25#PBF selects three distinct modes: tie to INTVCC for Burst Mode (3.5µA IQ, higher ripple), tie to GND for pulse-skipping (lowest ripple, ~20mVPP), or apply 1.0V–2.4V for forced continuous conduction. When driven by an external clock, it synchronizes switching and forces continuous mode - providing deterministic noise spectra and predictable EMI behavior.
What is the thermal performance of the LTC3624EDD-25#PBF in its 3mm × 3mm DFN package?
The LTC3624EDD-25#PBF in the 8-lead DFN (DD) package has θJA = 43°C/W and θJC = 5.5°C/W when the exposed pad is soldered to a minimum 1-in² copper area. At 2A load with 12V input and 5V output, typical power dissipation is ~0.4W, resulting in ~20°C junction-to-ambient rise - well within the –40°C to 125°C operating range. Thermal derating begins above 100°C ambient.
LTC3624EDD-25#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3624EDD-25#PBF FAQ
1.How can I place an order for LTC3624EDD-25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-25#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 LTC3624EDD-25#PBF reliable?
The price and inventory of LTC3624EDD-25#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624EDD-25#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-25#PBF?
LTC3624EDD-25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-25#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 LTC3624EDD-25#PBF?
For technical support, including LTC3624EDD-25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-25#PBF requirements.
6.How does Aetrix verify that LTC3624EDD-25#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-25#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 LTC3624EDD-25#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-25#PBF?
All LTC3624EDD-25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-25#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 LTC3624EDD-25#PBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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