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Analog Devices Inc. LTC3624EDD-23.3#TRPBF
- Part No.:
- LTC3624EDD-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,505
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Product details
Overview
LTC3624EDD-23.3#TRPBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 2A output current with 3.5µA quiescent current and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports 100% duty cycle dropout, and targets battery-powered instrumentation requiring ultra-low IQ and compact footprint.
For engineers reviewing the LTC3624EDD-23.3#TRPBF datasheet, LTC3624EDD-23.3#TRPBF pinout, LTC3624EDD-23.3#TRPBF application, or LTC3624EDD-23.3#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency for small external components, fixed 3.3V output eliminating feedback resistors, Burst Mode® operation for sub-100µA light-load IQ, and DFN-8 (3mm × 3mm) thermal performance with exposed pad grounding.
Technical Context
The LTC3624EDD-23.3#TRPBF uses constant-frequency peak current mode control with internal compensation and 1ms soft-start. Its 2.25MHz oscillator enables use of sub-2.2µH inductors and low-ESR ceramic capacitors while maintaining stability across 2.7V–17V input range.
It implements three operating modes via MODE/SYNC pin: Burst Mode® (tied to INTVCC) for 3.5µA IQ at light loads, pulse-skipping (tied to GND) for minimal output ripple, and forced continuous mode (1V–2.4V on MODE/SYNC) for predictable EMI and zero-load regulation. PGOOD provides ±7.5% output voltage monitoring with 32-cycle blanking delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (no external resistor divider required) |
| Switching Frequency | 2.25MHz ±20% (enables compact 1–2.2µH inductors and <10µF ceramic output caps) |
| Quiescent Current | 3.5µA in Burst Mode® (extends battery life in always-on portable devices) |
| Max Output Current | 2A continuous (supports microcontroller cores, RF modules, and sensor interfaces) |
| Input Voltage Range | 2.7V to 17V (compatible with single-cell Li-ion, multi-cell alkaline, and 12V industrial rails) |
| Efficiency Peak | 95% at 5VIN/3.3VOUT/1A (minimizes thermal stress in sealed enclosures) |
| Thermal Shutdown | Activates at TJ = 125°C (protects against sustained overload in high-ambient environments) |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 9), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave; requires tight layout and Kelvin connection to minimize EMI |
| VIN (Pins 2,3) | Power input | Accepts 2.7V–17V; bypass with ≥10µF ceramic capacitor placed adjacent to pins |
| RUN (Pin 4) | Enable control | Logic-high (>0.35V) enables regulation; tie to VIN or microcontroller GPIO for power sequencing |
| PGOOD (Pin 5) | Output voltage monitor | Open-drain output pulled low if VOUT deviates >±7.5%; 32-cycle blanking prevents false triggers during transients |
| FB (Pin 6) | Feedback reference | Internally tied to 3.3V output (fixed version); no external divider needed |
| INTVCC (Pin 7) | Internal LDO output | 3.6V regulated supply for gate drivers; bypass with ≥2.2µF ceramic to GND |
| MODE/SYNC (Pin 8) | Operating mode select | Tie to INTVCC for Burst Mode®, GND for pulse-skipping, or 1–2.4V for forced continuous mode; also accepts external clock (±40% sync range) |
| GND (Pins 8,9) | Signal & power ground | Pins 8 (top-side) and 9 (exposed pad) are internally connected; pad must be soldered to solid PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode® extends runtime in coin-cell or energy-harvesting systems |
| Fixed 3.3V output | Eliminates FB resistor network, reducing BOM count and layout area by ~1.5mm² |
| 2.25MHz switching | Enables use of 1.5µH inductors and 4.7µF–10µF X5R/X7R ceramics, cutting solution size by >40% vs 1MHz designs |
| 100% duty cycle operation | Maintains regulation down to VIN = VOUT, critical for Li-ion discharge down to 3.3V |
| Integrated soft-start | 1ms internal ramp prevents inrush current into bulk capacitance, easing input supply design |
| Overvoltage lockout | Shuts down at VIN > 19V and resumes at 18.5V, protecting internal MOSFETs from transient spikes |
Applications
| Battery-Powered Instrumentation | Emergency Radio Power Supply |
|---|---|
Use Scenario: Handheld multimeter or portable gas detector operating from two AA batteries (2.4V–3.2V) with intermittent 3.3V logic load. IC Role / Device Role / Timing Role: Primary 3.3V DC/DC converter providing regulated rail for MCU, ADC, and display driver. Use Value: 3.5µA IQ preserves battery capacity during 95% standby time; 100% duty cycle sustains operation until battery reaches 3.3V. | Use Scenario: Solar-charged emergency radio with wide-input buck converting 4.5V–15V solar/battery stack to stable 3.3V for digital baseband IC. IC Role / Device Role / Timing Role: Input-voltage-flexible step-down regulator enabling single-rail architecture across charging and discharge states. Use Value: 2.7V–17V input range accommodates full solar panel MPPT window; 2.25MHz switching minimizes inductor size for portable form factor. |
| Portable Medical Sensor Node | Industrial IoT Edge Controller |
Use Scenario: Wearable ECG patch powered by thin-film LiPo (3.0V–4.2V) requiring clean 3.3V for analog front-end and BLE SoC. IC Role / Device Role / Timing Role: Low-noise, high-efficiency power source with selectable noise/efficiency trade-off via MODE/SYNC. Use Value: Pulse-skipping mode (MODE/SYNC = GND) reduces output ripple to <15mVpp, preserving signal integrity in µV-level biopotential measurements. | Use Scenario: DIN-rail mounted sensor aggregator using 12V field bus to power 3.3V ARM Cortex-M7 processor, RS-485 transceivers, and isolated CAN interface. IC Role / Device Role / Timing Role: Robust primary DC/DC stage with overvoltage protection against 24V bus transients. Use Value: 19V overvoltage lockout prevents damage during 24V surge events; -40°C to +125°C rating ensures reliability in uncontrolled industrial cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286413RTER | 2.4MHz fixed 3.3V output, 1.8µA IQ, but only 1.2A max output current and 5.5V max input voltage | Suitable for lower-power wearables but cannot replace LTC3624EDD-23.3#TRPBF in 2A industrial loads or 12V+ inputs | Select when board space is constrained and load current ≤1.2A; verify input voltage compatibility. |
| MP2451DT-LF-Z | 2MHz fixed 3.3V output, 2A rating, 2.5V–36V input, but 25µA IQ and no Burst Mode® | Better for high-input-voltage industrial apps but lacks ultralow IQ for battery longevity | Choose for 24V systems where efficiency at light load is secondary to input voltage range. |
Compared with TPS6286413RTER and MP2451DT-LF-Z, the LTC3624EDD-23.3#TRPBF uniquely combines 2A capability, 17V input, 3.5µA IQ, and 2.25MHz switching-enabling compact, long-life, wide-input designs where all three attributes are simultaneously required.
Availability
LTC3624EDD-23.3#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, portable medical sensors, and industrial IoT edge controllers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3624EDD-23.3#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 precision power portfolio. Linear Technology pioneered high-performance monolithic DC/DC regulators with industry-leading efficiency and low IQ.
The LTC3624 family was designed specifically for space-constrained, battery-sensitive applications demanding both high efficiency at full load and ultralow quiescent current at light load-addressing the dual requirements of modern portable and always-on electronics.
FAQ
What is the maximum input voltage rating for the LTC3624EDD-23.3#TRPBF?
The LTC3624EDD-23.3#TRPBF has an absolute maximum input voltage rating of 17V. Operation above this level risks permanent damage. Its overvoltage lockout activates at 19V (with 500mV hysteresis), suspending switching until VIN drops below 18.5V. For reliable 12V system designs, this provides robust margin against transients. Always ensure input filtering limits dV/dt and peak clamping per the datasheet recommendations for the LTC3624EDD-23.3#TRPBF.
Does the LTC3624EDD-23.3#TRPBF require external feedback resistors?
No, the LTC3624EDD-23.3#TRPBF does not require external feedback resistors. As a fixed 3.3V output variant, its FB pin is internally connected to the regulated output, eliminating the need for an external resistor divider. This simplifies layout, reduces component count, and improves long-term stability by removing resistor tolerance and drift effects. The device maintains ±1% output accuracy across temperature and load without any external programming components.
How does the MODE/SYNC pin configure operating modes on the LTC3624EDD-23.3#TRPBF?
The MODE/SYNC pin on the LTC3624EDD-23.3#TRPBF selects between three distinct operating modes: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply 1V–2.4V for forced continuous mode (predictable EMI). It also accepts external clock signals within ±40% of 2.25MHz for synchronization. This pin directly controls the regulator's light-load behavior and EMI profile without requiring additional control logic, making the LTC3624EDD-23.3#TRPBF adaptable to diverse system-level noise and efficiency requirements.
What thermal considerations apply to the LTC3624EDD-23.3#TRPBF package?
The LTC3624EDD-23.3#TRPBF uses an 8-lead 3mm × 3mm DFN with exposed thermal pad (Pin 9). For rated thermal performance (θJA = 43°C/W), the exposed pad must be soldered to a minimum 100mm² PCB copper area connected to internal ground planes via ≥4 thermal vias. Insufficient pad soldering or undersized copper causes junction temperature to exceed 125°C under 2A load, triggering thermal shutdown. Thermal simulation or IR imaging is recommended for high-ambient deployments to validate the LTC3624EDD-23.3#TRPBF's actual junction temperature.
Can the LTC3624EDD-23.3#TRPBF operate in 100% duty cycle dropout mode?
Yes, the LTC3624EDD-23.3#TRPBF supports true 100% duty cycle operation, maintaining regulation as VIN approaches and equals VOUT (3.3V). In this mode, the PMOS top switch remains continuously on, and internal circuitry sustains control loop functionality. This capability is essential for battery-powered systems where usable voltage range extends down to the output rail-e.g., single-cell Li-ion discharging from 4.2V to 3.3V. Dropout operation is fully supported in all three MODE/SYNC configurations, though Burst Mode® further reduces IQ during light-load dropout conditions.
LTC3624EDD-23.3#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:
- 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-23.3#TRPBF FAQ
1.How can I place an order for LTC3624EDD-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-23.3#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-23.3#TRPBF reliable?
The price and inventory of LTC3624EDD-23.3#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-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-23.3#TRPBF?
LTC3624EDD-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-23.3#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-23.3#TRPBF?
For technical support, including LTC3624EDD-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624EDD-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-23.3#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-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-23.3#TRPBF?
All LTC3624EDD-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-23.3#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-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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