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Analog Devices Inc. LTC3624IDD-25#PBF
- Part No.:
- LTC3624IDD-25#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-25#PBF.pdf
- Description:
- IC REG BUCK 5V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:178
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Product details
Overview
LTC3624IDD-25#PBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 5V fixed-output synchronous step-down regulator delivering up to 2A output current with 3.5µA quiescent current in Burst Mode operation. It operates from 2.7V to 17V input, supports 100% duty cycle dropout, and features ±1% output voltage accuracy - ideal for space-constrained battery-powered instrumentation requiring stable low-noise 5V rail generation.
For engineers reviewing the LTC3624IDD-25#PBF datasheet, LTC3624IDD-25#PBF pinout, LTC3624IDD-25#PBF application, or LTC3624IDD-25#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency vs. load curves at 2.25MHz, real-world PGOOD timing behavior (32-cycle delay), and authoritative alternative selection guidance based on official Linear/Analog Devices documentation.
Technical Context
The LTC3624IDD-25#PBF 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 stability across 2.7V–17V input range and 5V fixed output.
It integrates dual MOSFETs (115mΩ NMOS / 200mΩ PMOS at VIN=5V), programmable operating modes via MODE/SYNC pin (Burst Mode, pulse-skipping, forced continuous), and overtemperature protection. The device enters ultralow-IQ sleep mode (<3.5µA) when output load drops below regulation threshold in Burst Mode.
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); synchronizable to external clock ±40% of nominal) |
| Max Output Current | 2A continuous; peak current limit 2.4A (E/I-grade) or 2.3A (H-grade) |
| Quiescent Current | 3.5µA in Burst Mode; 0.1µA in shutdown; 1.8mA in forced continuous mode |
| Input Voltage Range | 2.7V to 17V; includes undervoltage lockout (2.6V typ) and overvoltage protection (19V trip) |
| Efficiency | Up to 95% at full load (VOUT=5V, VIN=12V); >85% at 10mA load in Burst Mode |
| PGOOD Accuracy | ±7.5% window around 5V; 32-cycle delay on fault detection and recovery |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point between internal PMOS/NMOS switches and external inductor; carries high di/dt square wave |
| VIN (Pin 2) | Main power input | Supplies both power stage and internal LDO (INTVCC); accepts 2.7V–17V with UVLO/OVLO protection |
| RUN (Pin 3) | Enable control | Active-high logic input; must be pulled high (>0.35V) to enable regulation; floating not allowed |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output with 280Ω pull-down; asserts high only when VOUT is within ±7.5% of 5V for ≥32 cycles |
| FB (Pin 5) | Feedback reference | Internally tied to 5V output in fixed-VOUT version; not used externally for LTC3624IDD-25#PBF |
| INTVCC (Pin 6) | Internal LDO output | 3.6V ±0.4V regulated supply for gate drivers and logic; requires ≥2.2µF ceramic bypass to GND |
| MODE/SYNC (Pin 7) | Operating mode select | Configures Burst Mode (tied to INTVCC), pulse-skipping (tied to GND), or forced continuous (1V–2.4V) |
| GND (Pins 8 & 9) | Signal and power ground | Pins 8 (top-side) and 9 (exposed pad) are internally connected; pad must be soldered for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year battery life in 10µA average-load portable instruments |
| 2.25MHz fixed-frequency operation | Enables use of 2.2µH inductors and 4.7µF–10µF ceramic output capacitors, reducing solution footprint by >40% vs. 1MHz designs |
| 100% duty cycle capability | Maintains regulation down to VIN = VOUT + 0.1V, critical for Li-ion battery discharge into 5V systems |
| Integrated power MOSFETs | Eliminates need for external high-side PMOS and low-side NMOS, reducing BOM count and layout complexity |
| Robust protection suite | Includes overtemperature shutdown, VIN OVLO (19V), UVLO (2.6V), and reverse-current blocking during dropout |
Applications
| Battery-Powered Instrumentation | Emergency Radio Power Supply |
|---|---|
|
Use Scenario: Portable multimeter or handheld oscilloscope powered by two AA alkaline cells (1.8V–3.2V) stepping up to stable 5V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 5V system rail generator with dynamic input voltage tracking and ultralow standby IQ. Use Value: Extends battery life beyond 500 hours in sleep mode while maintaining fast wake-up response (<1ms) due to 1ms internal soft-start. |
Use Scenario: Solar-charged emergency radio with wide-input (3.5V–17V) battery stack supplying clean 5V to audio amplifier and microcontroller. IC Role / Device Role / Timing Role: Input-voltage-agile DC/DC converter enabling direct connection to variable solar/battery sources without pre-regulation. Use Value: Eliminates need for external LDO or buck-boost stage; maintains 5V output regulation even as input decays from 17V to 5.2V. |
| Industrial Sensor Node | Low-Power IoT Edge Device |
|
Use Scenario: Wireless temperature/humidity sensor node using CR2032 coin cell (2.0V–3.0V) powering 5V RF transceiver and precision ADC. IC Role / Device Role / Timing Role: High-efficiency step-up-capable buck regulator operating near dropout to maximize energy extraction from aging battery. Use Value: Delivers >82% efficiency at 10mA load with 2.5V input, enabling 2× longer field deployment vs. legacy 1MHz regulators. |
Use Scenario: Cellular IoT tracker with intermittent GPS/GNSS activation drawing 5V bursts up to 1.8A while maintaining <5µA sleep current. IC Role / Device Role / Timing Role: Primary power management IC providing regulated 5V with programmable light-load efficiency mode. Use Value: Burst Mode operation reduces average system IQ to 3.5µA, directly extending 10-year battery target by 22%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62865RRLR | 2.5V–5.5V input; 5V fixed output; 2A; 1.8MHz; 2.5µA IQ; no PGOOD or SYNC | Limited to low-VIN apps; lacks overvoltage protection and external sync capability | Choose for cost-sensitive, low-input-voltage-only designs where PGOOD and sync are unnecessary |
| MP2451DT-LF-Z | 4.5V–36V input; 5V fixed output; 0.6A; 2MHz; 260µA IQ; no MODE pin or Burst Mode | Lower current rating; higher IQ; no light-load efficiency optimization | Choose only if input exceeds 17V and 0.6A output suffices; avoid for battery longevity-critical designs |
Compared with TPS62865RRLR and MP2451DT-LF-Z, the LTC3624IDD-25#PBF uniquely combines 17V max input, 2A capability, 3.5µA Burst Mode IQ, PGOOD with 32-cycle blanking, and external clock synchronization - making it the sole option meeting all four requirements simultaneously in industrial and portable instrumentation.
Availability
LTC3624IDD-25#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radio power supplies, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624IDD-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, datasheet updates, and application engineering resources for the LTC3624 family.
The LTC3624 series was designed specifically for ultra-low-power, wide-input-voltage DC/DC conversion in portable and battery-critical systems - emphasizing quiescent current minimization without sacrificing transient response or thermal robustness.
FAQ
What is the guaranteed output voltage tolerance for LTC3624IDD-25#PBF over temperature?
The LTC3624IDD-25#PBF guarantees ±1% output voltage accuracy over its full operating junction temperature range of –40°C to 125°C. This is confirmed in the Electrical Characteristics table 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#PBF operate with input voltage lower than 5V while maintaining 5V output?
No - the LTC3624IDD-25#PBF is a step-down (buck) regulator only and cannot boost. It requires VIN ≥ VOUT + headroom (typically ≥5.2V for reliable 5V regulation). However, it supports 100% duty cycle operation down to VIN = VOUT + ~0.1V, enabling regulation as low as 5.1V input for 5V output under light loads.
How does the PGOOD pin behave during startup and load transients for LTC3624IDD-25#PBF?
The LTC3624IDD-25#PBF asserts PGOOD high only after output voltage remains within ±7.5% of 5V for 32 consecutive switching cycles (~14.2µs at 2.25MHz). During load transients causing temporary droop, PGOOD remains asserted unless deviation persists beyond 32 cycles; recovery is immediate upon re-entry into regulation.
Is an external feedback resistor divider required for LTC3624IDD-25#PBF?
No - the LTC3624IDD-25#PBF is the fixed 5V output variant. Its FB pin is internally connected to the output, eliminating need for external resistors. External feedback is required only for adjustable versions (e.g., LTC3624IDD-2#PBF). Connecting external resistors to FB on LTC3624IDD-25#PBF will disrupt regulation.
What thermal derating applies to LTC3624IDD-25#PBF at 125°C ambient?
At TA = 125°C with θJA = 43°C/W, maximum allowable power dissipation is PD = (TJMAX – TA)/θJA = (125°C – 125°C)/43 ≈ 0W - meaning full 2A operation is not sustainable at 125°C ambient without additional heatsinking. Derating curves in the datasheet show 1.3A max continuous output at TA = 100°C with standard PCB layout.
LTC3624IDD-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)
LTC3624IDD-25#PBF FAQ
1.How can I place an order for LTC3624IDD-25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-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 LTC3624IDD-25#PBF reliable?
The price and inventory of LTC3624IDD-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 LTC3624IDD-25#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-25#PBF?
LTC3624IDD-25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-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 LTC3624IDD-25#PBF?
For technical support, including LTC3624IDD-25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-25#PBF requirements.
6.How does Aetrix verify that LTC3624IDD-25#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-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 LTC3624IDD-25#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-25#PBF?
All LTC3624IDD-25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-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 LTC3624IDD-25#PBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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