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Analog Devices Inc. LTC3624EDD-23.3#PBF
- Part No.:
- LTC3624EDD-23.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD-23.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,599
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Product details
Overview
LTC3624EDD-23.3#PBF 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 in shutdown and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports 100% duty cycle dropout, and integrates internal compensation and soft-start. It is used in battery-powered portable instrumentation requiring ultra-low IQ and stable 3.3V rail generation.
For engineers reviewing the LTC3624EDD-23.3#PBF datasheet, LTC3624EDD-23.3#PBF pinout, LTC3624EDD-23.3#PBF application, or LTC3624EDD-23.3#PBF equivalent, key selection criteria include its 2.25MHz switching frequency for compact filter design, fixed 3.3V output eliminating external feedback resistors, Burst Mode® operation enabling 3.5µA IQ at light load, and DFN-8 (3mm × 3mm) thermal performance with exposed GND pad.
Technical Context
The LTC3624EDD-23.3#PBF employs constant-frequency peak current mode control with internal slope compensation, enabling stable operation across wide VIN and VOUT ranges. Its 2.25MHz oscillator allows use of small inductors (e.g., 2.2µH) and ceramic capacitors while maintaining tight regulation under transient loads.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode® (for <3.5µA IQ), pulse-skipping (for low ripple), and forced continuous (for EMI-sensitive applications). The FB pin is internally tied to VOUT for fixed 3.3V output, eliminating external divider components and reducing BOM count.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz ±10% - enables compact 2.2µH inductor and low-profile 4.7µF–10µF ceramic output capacitance |
| Output Voltage | 3.3V ±1% - factory-trimmed fixed output eliminates external feedback resistors and layout sensitivity |
| Max Output Current | 2A - supports single-rail powering of ARM Cortex-M microcontrollers, RF transceivers, and sensor interfaces |
| Quiescent Current | 3.5µA in shutdown, ~1.8mA in forced continuous mode - extends battery life in always-on emergency radios and portable meters |
| Input Voltage Range | 2.7V to 17V - accommodates single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.7–3.6V), and 12V industrial rails |
| Efficiency Peak | 95% at 5VIN/3.3VOUT, 1A - minimizes thermal rise in sealed enclosures without heatsinking |
| Thermal Shutdown | 125°C junction - protects against sustained overload in compact DFN-8 package with θJA = 43°C/W |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed GND pad (Pin 9), rated for –40°C to +125°C operating junction temperature. Exposed pad must be soldered to PCB ground plane for electrical integrity and thermal performance (θJC = 5.5°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SW | Switch node - connects to inductor; carries high di/dt square wave; requires low-inductance layout and Kelvin connection to minimize ringing |
| 2 | VIN | Main power input - accepts 2.7V–17V; bypassed with ≥10µF ceramic capacitor placed adjacent to pin |
| 3 | RUN | Enable control - logic-high (>1.0V) enables regulation; must not float; pulled low to disable converter and enter zero-current shutdown |
| 4 | PGOOD | Open-drain power-good indicator - asserts high when VOUT is within ±7.5% of 3.3V; includes 32-cycle blanking delay to suppress transient glitches |
| 5 | FB | Feedback input - internally connected to VOUT for fixed 3.3V operation; no external resistor divider required |
| 6 | INTVCC | Internal LDO output - powers gate drivers and internal circuitry; requires ≥2.2µF ceramic bypass to GND |
| 7 | MODE/SYNC | Operating mode select/synchronization - tie to INTVCC for Burst Mode®, GND for pulse-skipping, or external clock (2.05–2.45MHz) for sync |
| 8 & 9 (exposed) | GND | Power and signal ground - all GND pins and exposed pad must be connected to solid PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 3.5µA at light loads while maintaining regulation - critical for multi-year battery life in remote sensors |
| Fixed 3.3V Output | Eliminates external feedback resistors and associated layout errors - improves production yield and reduces bill-of-materials cost |
| 2.25MHz Switching Frequency | Enables use of sub-3mm height 2.2µH shielded inductors and 0603/0805 ceramic capacitors - saves board space in portable medical devices |
| 100% Duty Cycle Capability | Maintains regulation down to VIN = VOUT (3.3V) - supports brownout operation during battery discharge without rail collapse |
| Integrated Soft-Start | 1ms internal ramp prevents inrush current and output overshoot during power-up - avoids reset faults in downstream logic |
| Synchronization Input | Accepts external clock from 1.225MHz to 3.15MHz (±40% of 2.25MHz) - enables EMI reduction via frequency dithering or system-level clock alignment |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by two AA alkaline cells (2.7–3.6V) requiring clean, regulated 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing stable supply to ARM Cortex-M4 MCU, 16-bit SAR ADC, and LCD driver. Use Value: 3.5µA shutdown IQ extends battery life beyond 5 years in sleep mode; 100% duty cycle maintains regulation as battery drops to 3.3V. |
Use Scenario: Solar-charged emergency radios with LiFePO4 battery (2.8–3.6V) needing reliable 3.3V rail for RF front-end and audio codec. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying low-noise 3.3V to Si4463 transceiver and CS43L22 audio DAC. Use Value: Burst Mode® ensures <5µA system standby current; PGOOD flag enables automatic battery health monitoring and low-VBAT alert. |
| Industrial Sensor Nodes | Low-Power IoT Edge Devices |
Use Scenario: Wireless vibration sensor nodes powered by primary lithium thionyl chloride (3.6V) with 10-year field life requirement. IC Role / Device Role / Timing Role: Efficient step-down regulator converting 3.6V battery to 3.3V for MSP430FR5994 MCU and ADXL362 accelerometer. Use Value: 95% peak efficiency at 1mA load minimizes self-heating; integrated soft-start prevents false wake-ups during cold start. |
Use Scenario: Cellular IoT tracker using NB-IoT modem (3.3V interface) and GPS receiver, powered by 3.7V Li-ion with aggressive duty cycling. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V to modem, GNSS chip, and flash memory during active transmission bursts. Use Value: 2.25MHz switching allows <100ns minimum on-time compliance; MODE/SYNC pin enables synchronized burst transmission to reduce conducted EMI. |
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 |
|---|---|---|---|
| TPS6286518RQYR | 2.5V fixed output, 4MHz switching, 1.2A max, 0.7µA shutdown IQ | Lower output voltage and current rating; optimized for ultra-low-power wearables, not 3.3V systems | Select only if 2.5V rail is acceptable and 1.2A suffices; requires redesign of power tree and layout |
| MP2155GQZ-P | 3.3V fixed output, 2MHz switching, 2A max, 22µA quiescent current in light-load mode | Higher IQ degrades battery life in multi-year deployments; no Burst Mode® or true zero-IQ shutdown | Use where cost is primary constraint and 22µA IQ is acceptable; avoid in energy-harvesting or long-life battery apps |
Compared with LTC3624EDD-23.3#PBF, TPS6286518RQYR offers lower IQ but mismatches the required 3.3V output, while MP2155GQZ-P matches voltage and current but lacks ultralow 3.5µA shutdown IQ and robust dropout behavior - making LTC3624EDD-23.3#PBF optimal for long-life, wide-input, fixed-3.3V applications.
Availability
LTC3624EDD-23.3#PBF is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, emergency radios, industrial sensor nodes, and low-power IoT edge devices requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3624EDD-23.3#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and aerospace markets.
The LTC3624 family was designed specifically for ultra-low-quiescent-current, high-efficiency step-down conversion in space-constrained, battery-critical applications - emphasizing 3.5µA shutdown IQ, fixed-output variants, and robust 17V input tolerance.
FAQ
What is the switching frequency of the LTC3624EDD-23.3#PBF and how is it set?
The LTC3624EDD-23.3#PBF operates at a nominal switching frequency of 2.25MHz, with a typical tolerance of ±10% over temperature and line. This frequency is factory-fixed and cannot be adjusted externally; however, the MODE/SYNC pin supports synchronization to an external clock within ±40% of 2.25MHz (i.e., 1.35MHz to 3.15MHz). The part enters sync mode within 2–3 cycles of valid external clock edges.
Does the LTC3624EDD-23.3#PBF require external feedback resistors to set the output voltage?
No, the LTC3624EDD-23.3#PBF does not require external feedback resistors. It is a fixed-output variant with the FB pin internally connected to VOUT, delivering a factory-trimmed 3.3V ±1% output. This eliminates resistor matching errors, layout sensitivity, and BOM cost - unlike adjustable versions such as LTC3624EDD-2#PBF, which require an external R1/R2 divider.
What is the quiescent current of the LTC3624EDD-23.3#PBF in shutdown mode?
The LTC3624EDD-23.3#PBF draws 0.1µA typical (max 1µA) input current in shutdown mode, achieved by pulling the RUN pin low. In Burst Mode® operation (RUN high, MODE/SYNC tied to INTVCC), quiescent current is 3.5µA typical at light load - enabling multi-year battery life in always-on sensor nodes and emergency equipment.
Can the LTC3624EDD-23.3#PBF operate with input voltage equal to its 3.3V output?
Yes, the LTC3624EDD-23.3#PBF supports 100% duty cycle operation, maintaining regulation with input voltage as low as 3.3V. This dropout capability is critical for battery-powered systems where VIN decays toward VOUT (e.g., LiFePO4 or alkaline cells), ensuring uninterrupted 3.3V supply without rail collapse or brownout resets.
What package type and thermal characteristics does the LTC3624EDD-23.3#PBF use?
The LTC3624EDD-23.3#PBF uses an 8-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 9). Its thermal resistance is θJA = 43°C/W (with 2-layer PCB, 1-in² copper) and θJC = 5.5°C/W. The exposed pad must be soldered to a solid PCB ground plane to achieve rated thermal performance and ensure reliable operation up to 125°C junction temperature.
LTC3624EDD-23.3#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):
- 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#PBF FAQ
1.How can I place an order for LTC3624EDD-23.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD-23.3#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-23.3#PBF reliable?
The price and inventory of LTC3624EDD-23.3#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-23.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD-23.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD-23.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD-23.3#PBF?
LTC3624EDD-23.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD-23.3#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-23.3#PBF?
For technical support, including LTC3624EDD-23.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD-23.3#PBF requirements.
6.How does Aetrix verify that LTC3624EDD-23.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD-23.3#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-23.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD-23.3#PBF?
All LTC3624EDD-23.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD-23.3#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-23.3#PBF part is unused and in its original packaging.
Return procedure for LTC3624EDD-23.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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