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Analog Devices Inc. LTC3624IDD-2#PBF
- Part No.:
- LTC3624IDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:301
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Product details
Overview
LTC3624IDD-2#PBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 17V input, 2A synchronous step-down DC/DC regulator in an 8-lead 3mm × 3mm DFN package. It delivers adjustable output from 0.6V to VIN with ±1% feedback accuracy, 3.5µA quiescent current in shutdown, and supports Burst Mode®, pulse-skipping, and forced continuous operation - ideal for battery-powered portable instrumentation requiring ultra-low IQ and compact footprint.
For engineers reviewing the LTC3624IDD-2#PBF datasheet, LTC3624IDD-2#PBF pinout, LTC3624IDD-2#PBF application, or LTC3624IDD-2#PBF equivalent, key selection criteria include its 2.25MHz switching frequency (±40% sync range), 100% duty-cycle dropout capability, internal compensation, and thermal performance in the DD package with exposed GND pad soldered to PCB.
Technical Context
The LTC3624IDD-2#PBF employs a constant-frequency peak current mode control architecture with internal slope compensation, enabling stable operation up to 100% duty cycle during low-VIN dropout. Its MODE/SYNC pin configures three operating modes: Burst Mode (≤3.5µA IQ), pulse-skipping (low VOUT ripple), or forced continuous (fixed 2.25MHz).
It integrates dual MOSFETs (115mΩ PMOS high-side, 200mΩ NMOS low-side at VIN=5V), a 0.6V reference amplifier, soft-start (1ms), overtemperature protection, and PGOOD with ±7.5% window and 32-cycle blanking delay - all optimized for wide-input, low-quiescent-current power conversion in space-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion up to 4S battery stacks and industrial 12V rails. |
| Switching Frequency | 2.25MHz (±40% sync range) - enables use of small external inductors (e.g., 2.2µH) and ceramic capacitors. |
| Output Current | Up to 2A continuous - sufficient for powering microcontrollers, sensors, and RF modules. |
| Quiescent Current | 3.5µA in shutdown, ≤7µA in Burst Mode - extends battery life in always-on portable devices. |
| Feedback Accuracy | ±1% over temperature - ensures precise regulation for sensitive analog or mixed-signal loads. |
| Duty Cycle Max | 100% - maintains regulation down to VOUT = VIN, critical for low-dropout operation. |
| Thermal Rating | –40°C to 125°C junction - qualified for automotive cabin and industrial ambient environments. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed GND pad (Pin 9), requiring PCB soldering for thermal and electrical integrity per θJC = 5.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square-wave voltage swing. |
| VIN (Pins 2,3) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch driver. |
| RUN (Pin 4) | Enable control | Logic-high (>1.0V) activates regulator; must not be left floating. |
| PGOOD (Pin 5) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking. |
| FB (Pin 6) | Feedback input | Senses resistor divider output; regulates VOUT = 0.6V × (1 + R2/R1) for adjustable versions. |
| INTVCC (Pin 7) | Internal LDO output | 3.2V–4.0V regulated supply for gate drivers; requires ≥2.2µF ceramic bypass to GND. |
| MODE/SYNC (Pin 8) | Mode select & clock sync | Tied to INTVCC → Burst Mode; GND → pulse-skipping; 1V–(VINTVCC–1.2V) → forced continuous; external clock → sync. |
| GND (Pins 8,9) | Signal & power ground | Exposed pad (Pin 9) is electrically GND and mandatory for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA shutdown IQ enables multi-year battery life in emergency radios and IoT endpoints. |
| 100% duty-cycle operation | Maintains regulation when VIN ≈ VOUT - essential for Li-ion discharge down to 3.0V while powering 3.3V logic. |
| Three selectable operating modes | Burst Mode (max efficiency), pulse-skipping (min ripple), forced continuous (EMI control) - configurable via single MODE/SYNC pin. |
| Internal compensation & soft-start | Reduces external component count; 1ms soft-start prevents inrush current and output overshoot at startup. |
| Robust protection suite | Includes overtemperature shutdown, VIN overvoltage lockout (19V trip), and undervoltage lockout (2.7V). |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable gas detectors operating from two AA cells (2.4V–3.2V) with 3.3V digital core and analog front-end. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V at up to 2A with <3.5µA sleep current to maximize runtime. Use Value: Enables >500-hour standby on alkaline batteries via Burst Mode, while maintaining fast transient response during measurement bursts. | Use Scenario: Compact emergency AM/FM/NOAA weather radios powered by replaceable CR123A or AA batteries. IC Role / Device Role / Timing Role: Efficient 3.3V supply for MCU, audio amplifier, and RF receiver - operating across full battery discharge curve (3.6V–2.0V). Use Value: 100% duty-cycle capability sustains regulation down to 2.0V input, extending usable battery life beyond competing regulators. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: DIN-rail mounted condition monitoring modules converting 12V/24V industrial bus to 5V/3.3V for microcontrollers and communication ICs. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter replacing discrete solutions in space-limited enclosures. Use Value: 8-lead DFN package with exposed pad simplifies thermal design vs. larger SOIC alternatives, reducing board area by >60%. | Use Scenario: Wireless vibration sensors deployed in factory machinery, powered by primary lithium cells (3.6V) with 10+ year lifetime requirements. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator supplying 3.3V to low-power MCU and MEMS accelerometer during periodic wake-up cycles. Use Value: 3.5µA shutdown current minimizes self-discharge, preserving >95% battery capacity over 10 years at 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 2.4V–6V input, 1.8V–5.5V fixed/adjustable output, 1.8MHz, 0.36µA IQ (shutdown) | Narrower VIN range; better for single Li-ion or USB-powered systems; lacks 17V rating and 100% duty cycle. | Select for ultra-low-IQ battery applications below 6V input where 17V tolerance is unnecessary. |
| MP2451DT-LF-Z | 4.5V–28V input, 0.8V–15V output, 2MHz, 250µA IQ, no Burst Mode, no 100% duty cycle | Higher IQ; no ultralow-power sleep mode; wider VIN but less efficient at light loads. | Select for cost-sensitive industrial supplies above 4.5V where IQ >1µA is acceptable and dropout headroom is ample. |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the LTC3624IDD-2#PBF uniquely combines 17V input tolerance, 100% duty-cycle operation, and sub-4µA shutdown IQ - making it the only choice for long-life, wide-input battery systems requiring deep discharge support and minimal board area.
Availability
LTC3624IDD-2#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and industrial sensor nodes requiring stable component supply, extended temperature operation (–40°C to 125°C), and consistent parametric performance across production lots.
Supply support for LTC3624IDD-2#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 its precision power portfolio with rigorous qualification standards and long-term product longevity commitments.
The LTC3624IDD-2#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-quiescent-current power conversion in portable and energy-constrained systems.
FAQ
What is the switching frequency of the LTC3624IDD-2#PBF and can it be synchronized?
The LTC3624IDD-2#PBF operates at a fixed 2.25MHz switching frequency with ±40% synchronization range. Its MODE/SYNC pin accepts an external clock signal to lock the internal oscillator - enabling EMI reduction and multi-rail timing alignment without requiring additional timing components. This capability is confirmed in the Electrical Characteristics table under fOSC and fSYNC parameters for the LTC3624-2 variant.
Does the LTC3624IDD-2#PBF support 100% duty-cycle operation and why does that matter?
Yes, the LTC3624IDD-2#PBF supports 100% duty-cycle operation, allowing regulation when VIN approaches VOUT - critical for maintaining system functionality during deep battery discharge (e.g., down to 2.0V input for a 2.0V output). This feature is explicitly specified as DMAX = 100% in the Electrical Characteristics table and enables reliable operation in battery-powered applications where input voltage collapses near the output setpoint.
What are the quiescent current specifications for the LTC3624IDD-2#PBF in different operating modes?
The LTC3624IDD-2#PBF draws 3.5µA in shutdown mode (RUN = 0V), ≤7µA in Burst Mode operation, and ~1.8mA in forced continuous mode - values confirmed in the IVIN row of the Electrical Characteristics table. These low IQ figures directly enable multi-year battery life in always-on portable equipment, with Burst Mode automatically engaging at light loads to minimize power loss.
How is output voltage programmed on the LTC3624IDD-2#PBF?
The LTC3624IDD-2#PBF uses resistor divider feedback to the FB pin: VOUT = 0.6V × (1 + R2/R1). This equation is validated in the Applications Information section and Figure 1 of the datasheet. For fixed-output variants (e.g., LTC3624-23.3), FB is connected directly to VOUT - but the LTC3624IDD-2#PBF is the adjustable version, requiring external resistors to set the desired output voltage within 0.6V to VIN.
What thermal considerations apply to the LTC3624IDD-2#PBF in its 8-lead DFN package?
The LTC3624IDD-2#PBF in the 8-lead (3mm × 3mm) DFN package requires soldering of the exposed GND pad (Pin 9) to a PCB thermal plane to achieve θJC = 5.5°C/W. The datasheet specifies TJMAX = 125°C and θJA = 43°C/W - meaning proper thermal land design is essential for sustained 2A operation at elevated ambient temperatures. Failure to solder the exposed pad degrades thermal performance and risks premature thermal shutdown.
LTC3624IDD-2#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- 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-2#PBF FAQ
1.How can I place an order for LTC3624IDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-2#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-2#PBF reliable?
The price and inventory of LTC3624IDD-2#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-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-2#PBF?
LTC3624IDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-2#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-2#PBF?
For technical support, including LTC3624IDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-2#PBF requirements.
6.How does Aetrix verify that LTC3624IDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-2#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-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-2#PBF?
All LTC3624IDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-2#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-2#PBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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