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Analog Devices Inc. LTC3624EDD-3.3#TRPBF
- Part No.:
- LTC3624EDD-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,862
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Product details
Overview
LTC3624EDD-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a 17V input, 2A synchronous step-down DC/DC regulator with fixed 3.3V output, 1MHz switching frequency, 3.5µA quiescent current in Burst Mode, ±1% output voltage accuracy, and operation from 2.7V to 17V input-designed for battery-powered portable instrumentation requiring ultra-low power standby.
For engineers reviewing the LTC3624EDD-3.3#TRPBF datasheet, LTC3624EDD-3.3#TRPBF pinout, LTC3624EDD-3.3#TRPBF application, or LTC3624EDD-3.3#TRPBF equivalent, key selection criteria include fixed 3.3V output accuracy, ultralow IQ under light load, dropout capability at 100% duty cycle, thermal performance in DFN package, and MODE/SYNC pin configurability for ripple-efficiency trade-off.
Technical Context
The LTC3624EDD-3.3#TRPBF employs constant-frequency peak current mode control with internal compensation and 1ms soft-start. It integrates both PMOS high-side and NMOS low-side power switches with RDS(ON) of 200mΩ (top) and 115mΩ (bottom) at VIN = 5V.
Its MODE/SYNC pin supports three operating modes: Burst Mode (MODE tied to INTVCC), pulse-skipping (MODE grounded), or forced continuous (MODE biased 1V–VINTVCC−1.2V), enabling dynamic optimization of efficiency versus output ripple across load conditions from zero to 2A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery-supplied systems including 9V, 12V, and Li-ion stacks. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors; ensures stable logic supply for microcontrollers and sensors. |
| Max Output Current | 2A - delivers sufficient power for FPGA I/O banks, RF front-ends, or multi-rail embedded subsystems. |
| Quiescent Current | 3.5µA in Burst Mode - enables >1-year battery life in emergency radios or remote sensors with intermittent wake-up. |
| Switching Frequency | 1MHz ±40% sync range - allows EMI-sensitive designs to shift switching noise away from critical bands using external clock. |
| Efficiency Peak | 95% at full load - minimizes thermal rise in compact enclosures and extends runtime in portable equipment. |
| Duty Cycle Limit | 100% - maintains regulation down to VIN = VOUT, essential for brownout resilience in battery discharge scenarios. |
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 integrity (θJA = 43°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; requires tight layout and Kelvin routing. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch; requires local 10µF ceramic bypass. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulls low to disable regulator and reduce total system IQ to <100nA. |
| PGOOD (Pin 4) | Power-Good Indicator | Open-drain output asserting high when VOUT is within ±7.5% of 3.3V; includes 32-cycle blanking to suppress transient glitches. |
| FB (Pin 5) | Feedback Reference | Internally connected to 3.3V output in fixed-VOUT variants; no external divider required. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and logic; must be bypassed with ≥2.2µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Configures Burst Mode (to INTVCC), pulse-skipping (to GND), or forced continuous (1V–2.4V); also accepts external clock up to ±40% of 1MHz. |
| GND (Pins 8 & 9) | Signal & Power Ground | Pins 8 and exposed pad (Pin 9) are internally bonded; exposed pad must be soldered to solid GND plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 3.5µA in Burst Mode enables multi-year battery operation in always-on sensor nodes without compromising startup time. |
| 100% Duty Cycle Operation | Maintains regulation down to VIN = VOUT = 3.3V, critical for Li-ion cells discharging below 3.6V while powering 3.3V logic rails. |
| Integrated Power Switches | Monolithic PMOS/NMOS pair eliminates external MOSFETs and driver complexity, reducing BOM count and layout area by >30%. |
| Programmable Operating Mode | Single-pin MODE/SYNC selection allows real-time trade-off between light-load efficiency (Burst) and output ripple (pulse-skipping). |
| Robust Protection Suite | Includes overtemperature shutdown, VIN overvoltage lockout (19V trip), undervoltage lockout (2.7V), and reverse-current blocking. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeter or portable oscilloscope operating from two AA alkaline cells (1.8V–3.2V) with 3.3V MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with dropout support and ultralow IQ to extend battery life during sleep intervals. Use Value: Delivers 2A peak current for display backlight bursts while drawing only 3.5µA between measurements-enabling >500 hours of active use per battery set. | Use Scenario: Solar-charged emergency radio with supercapacitor backup, requiring reliable 3.3V supply during grid outage. IC Role / Device Role / Timing Role: Main step-down regulator managing variable solar input (3V–15V) to stable 3.3V output for audio amplifier and digital decoder. Use Value: 100% duty cycle operation sustains output as supercapacitor voltage decays from 5V to 3.3V, avoiding brownout resets during critical broadcast reception. |
| Portable Medical Sensors | Industrial IoT Edge Nodes |
Use Scenario: Wearable ECG patch powered by coin-cell battery, transmitting data intermittently via BLE. IC Role / Device Role / Timing Role: Efficient 3.3V supply for ultra-low-power MCU and analog signal chain, activated only during measurement windows. Use Value: 3.5µA quiescent current extends single CR2032 battery life beyond 12 months in typical usage, meeting FDA Class II device longevity requirements. | Use Scenario: Wireless vibration sensor node mounted on rotating machinery, harvesting energy from piezoelectric transducer (2.5V–16V). IC Role / Device Role / Timing Role: Wide-input buck converter conditioning harvested energy into regulated 3.3V for microcontroller and LoRa transceiver. Use Value: 1MHz switching frequency enables compact 2.2µH inductor and 4.7µF ceramic output cap, minimizing footprint in constrained mechanical housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | 2.7V–6V input, 3.3V fixed, 0.35µA IQ, 2.25MHz fSW, 1.5A max output | Lower input voltage ceiling limits use in 9V/12V systems; higher fSW reduces inductor size but increases switching loss above 5VIN | Select when ultra-low IQ (<1µA) and compact solution size outweigh need for 17V input or 2A output. |
| MP2143GJ-Z | 4.5V–28V input, 3.3V fixed, 30µA IQ, 1.5MHz fSW, 3A output, no MODE pin | Higher IQ reduces battery life; lacks programmable mode selection-only forced CCM or auto PSM; wider VIN suits 24V industrial rails. | Select for 24V industrial applications where 3A output and robustness outweigh need for sub-µA standby or ripple control flexibility. |
Compared with TPS62840DRVR and MP2143GJ-Z, the LTC3624EDD-3.3#TRPBF uniquely balances 17V input tolerance, 2A output, 3.5µA IQ, and pin-configurable operation modes-making it optimal for portable equipment bridging consumer and industrial voltage ranges.
Availability
LTC3624EDD-3.3#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and portable medical sensors requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC3624EDD-3.3#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 series was designed specifically for ultra-low-power, wide-input DC/DC conversion in space-constrained portable and battery-critical applications-emphasizing quiescent current, dropout behavior, and thermal efficiency in small packages.
FAQ
What is the guaranteed output voltage accuracy of the LTC3624EDD-3.3#TRPBF?
The LTC3624EDD-3.3#TRPBF guarantees ±1% output voltage accuracy over temperature and line/load conditions, with typical VOUT = 3.3V measured at 3.267V to 3.333V across –40°C to 125°C junction temperature. This accuracy is achieved via laser-trimmed internal reference and does not require external calibration. The LTC3624EDD-3.3#TRPBF achieves this specification without feedback resistor networks, simplifying design and improving long-term stability.
Does the LTC3624EDD-3.3#TRPBF support synchronization to an external clock?
Yes, the LTC3624EDD-3.3#TRPBF supports external clock synchronization via the MODE/SYNC pin with a capture range of ±40% around its nominal 1MHz frequency (i.e., 0.6MHz to 1.4MHz). When an external clock is applied, the device enters forced continuous mode and locks within 2–3 cycles. The LTC3624EDD-3.3#TRPBF maintains synchronization even during input transients, making it suitable for noise-sensitive systems requiring deterministic switching timing.
How does the LTC3624EDD-3.3#TRPBF achieve ultralow quiescent current?
The LTC3624EDD-3.3#TRPBF achieves 3.5µA quiescent current in Burst Mode by disabling both power switches and most internal circuitry during light-load sleep intervals, while retaining just enough bias to monitor output voltage. When VOUT droops below regulation, the part wakes and delivers a burst of switching cycles to restore voltage before returning to sleep. This behavior is intrinsic to the LTC3624EDD-3.3#TRPBF's architecture and requires no external components or configuration beyond tying MODE/SYNC to INTVCC.
Can the LTC3624EDD-3.3#TRPBF operate with input voltage equal to its 3.3V output?
Yes, the LTC3624EDD-3.3#TRPBF supports 100% duty cycle operation, enabling regulation with VIN as low as 3.3V. In dropout, the top PMOS switch remains continuously on while control loop activity is minimized-maintaining VOUT within ±1% even as input decays. This capability is verified across temperature and load, and is a defined feature of the LTC3624EDD-3.3#TRPBF, not a marginal condition.
What thermal considerations apply to the LTC3624EDD-3.3#TRPBF in its DFN package?
The LTC3624EDD-3.3#TRPBF uses an 8-lead 3mm × 3mm DFN with exposed thermal pad (Pin 9 = GND), rated at θJA = 43°C/W with standard 2-layer PCB layout. Full thermal performance requires soldering the exposed pad to a minimum 100mm² copper pour connected to internal GND planes. Without proper pad connection, junction temperature may exceed 125°C at 2A load, triggering thermal shutdown. The LTC3624EDD-3.3#TRPBF includes internal overtemperature protection that disables switching until TJ falls below threshold.
LTC3624EDD-3.3#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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624EDD-3.3#TRPBF FAQ
1.How can I place an order for LTC3624EDD-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-3.3#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 LTC3624EDD-3.3#TRPBF reliable?
The price and inventory of LTC3624EDD-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624EDD-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-3.3#TRPBF?
LTC3624EDD-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-3.3#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 LTC3624EDD-3.3#TRPBF?
For technical support, including LTC3624EDD-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624EDD-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-3.3#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 LTC3624EDD-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-3.3#TRPBF?
All LTC3624EDD-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-3.3#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 LTC3624EDD-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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