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Analog Devices Inc. LTC3624EDD#TRPBF
- Part No.:
- LTC3624EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,488
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Product details
Overview
LTC3624EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC regulator in an 8-lead 3mm × 3mm DFN package, featuring 2.25MHz fixed switching frequency, 3.5µA quiescent current in shutdown, ±1% output voltage accuracy, and adjustable 0.6V to VIN output range - deployed in portable instrumentation and emergency radios requiring ultra-low-power operation.
For engineers reviewing the LTC3624EDD#TRPBF datasheet, LTC3624EDD#TRPBF pinout, LTC3624EDD#TRPBF application, or LTC3624EDD#TRPBF equivalent, key selection criteria include its 2.25MHz sync-capable oscillator, Burst Mode®/pulse-skipping/forced continuous mode control via MODE/SYNC, 100% duty cycle dropout capability, internal compensation, and thermal performance with exposed pad grounding.
Technical Context
The LTC3624EDD#TRPBF implements a constant-frequency peak current mode architecture with internal slope compensation, enabling stable regulation across wide input (2.7V–17V) and output (0.6V–VIN) ranges. Its 2.25MHz switching frequency supports compact external components while maintaining high efficiency up to 95% at full load.
It integrates dual MOSFET power switches (PMOS high-side, NMOS low-side), a 0.6V reference error amplifier, programmable soft-start (1ms), overtemperature protection, and VIN overvoltage lockout (19V rising). The MODE/SYNC pin enables three operating modes: Burst Mode® (3.5µA IQ), pulse-skipping (low ripple), or forced continuous (fixed frequency), with external clock synchronization across ±40% of nominal frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input battery and industrial supplies without pre-regulation |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from 12V input down to 0.6V for core logic rails |
| Max Output Current | 2A - delivers sufficient power for microcontrollers, sensors, and RF modules |
| Switching Frequency | 2.25MHz (±40% sync range) - allows use of small 2.2µH inductors and ceramic capacitors |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on monitoring systems |
| Feedback Reference | 0.6V ±1% - ensures precise output setting with minimal resistor tolerance impact |
| Efficiency (Typ) | 95% at 5VOUT/800mA - minimizes thermal stress and PCB area in space-constrained designs |
Pinout & Package
Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 9 = GND), rated for –40°C to 125°C junction temperature and 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 current - requires tight layout and ground plane coupling |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V input; powers internal circuitry and high-side PMOS gate drive via INTVCC LDO |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulling low disables regulator and reduces IQ to 0.1µA - must not float |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output asserting high when VOUT is within ±7.5%; includes 32-cycle blanking delay to suppress transient glitches |
| FB (Pin 5) | Feedback Input | Senses resistive divider output; regulates VOUT = 0.6V × (1 + R2/R1); shorted to VOUT for fixed-output variants |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and analog circuitry; requires ≥2.2µF ceramic bypass to GND |
| MODE/SYNC (Pin 7) | Operating Mode Select / Clock Sync | Configures Burst Mode® (tied to INTVCC), pulse-skipping (tied to GND), or forced continuous (1V–2.4V); accepts external clock for synchronization |
| GND (Pins 8 & Exposed Pad 9) | Signal & Power Ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for multi-year battery life in IoT sensors |
| 100% Duty Cycle Dropout | Enables regulation down to VIN ≈ VOUT with ultralow IQ - supports brownout operation in emergency radios |
| Internal Compensation | Eliminates need for external compensation network - simplifies design and reduces BOM count |
| Overtemperature Protection | Thermal shutdown at TJ > 125°C (E-grade) prevents damage during overload or poor heatsinking |
| Programmable Soft-Start | Fixed 1ms internal ramp prevents inrush current - avoids input rail collapse during power-up |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers powered by two AA cells (2.4V–3.2V) requiring stable 1.8V and 3.3V rails. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 2A peak current with 3.5µA shutdown IQ to maximize runtime between battery replacements. Use Value: Enables >5-year shelf life in storage and >100 hours of continuous operation per charge due to ultralow quiescent current and efficient light-load operation. | Use Scenario: Solar-charged emergency communication radios operating in remote locations with intermittent input (4V–15V) and strict size constraints. IC Role / Device Role / Timing Role: Main power converter supplying 3.3V to MCU and RF transceiver, supporting 100% duty cycle during low-VIN brownout conditions. Use Value: Maintains system functionality down to VIN = VOUT + margin, extending usable battery window by 25% compared to non-dropout regulators. |
| Portable Medical Sensors | Low-Power Industrial Controllers |
Use Scenario: Wearable ECG monitors using coin-cell batteries (2.0V–3.0V) needing clean 1.2V analog supply and 2.8V digital rail. IC Role / Device Role / Timing Role: Dual-output regulator (via two LTC3624EDD#TRPBF) providing isolated, low-noise power with selectable pulse-skipping mode for sensor ADC stability. Use Value: Achieves <10mVpp output ripple in pulse-skipping mode - meets EN 60601-1 conducted emission limits without added filtering. | Use Scenario: DIN-rail mounted condition monitoring nodes powered from 12V industrial bus with 2A peak demand for wireless transmission bursts. IC Role / Device Role / Timing Role: High-efficiency primary DC/DC stage converting 12V to 5V for microcontroller and radio, synchronized to system clock to reduce EMI. Use Value: 2.25MHz sync capability eliminates beat frequencies with other system clocks, easing EMC certification. |
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 | 2.4V–6V input, 0.6V–5.5V output, 1.8A max, 0.7µA IQ - narrower VIN range, lower current rating | Optimized for single-cell Li-ion (3.0V–4.2V) systems; lacks 17V rating and 100% dropout | Select when ultra-low IQ (<1µA) is mandatory and input never exceeds 6V |
| MP2451DT-LF-Z | 4.5V–28V input, 0.8V–15V output, 2A, 250kHz–1.4MHz adjustable fSW, 40µA IQ - higher IQ, no Burst Mode®, no 100% duty cycle | Suited for higher-voltage industrial inputs but unsuitable for battery-critical long-life designs | Select when cost sensitivity outweighs IQ requirements and 17V+ input is needed |
Compared with TPS62840DRVR and MP2451DT-LF-Z, the LTC3624EDD#TRPBF uniquely combines 17V input capability, 2.25MHz fixed frequency, 3.5µA shutdown IQ, and true 100% duty cycle - making it optimal for wide-input, battery-constrained, space-limited applications where both robustness and longevity are essential.
Availability
LTC3624EDD#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3624EDD#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 legacy of high-performance power management ICs with rigorous reliability testing and automotive/industrial qualification.
The LTC3624 product line was designed for ultra-low-power, wide-input DC/DC conversion in portable and energy-harvesting systems - emphasizing quiescent current optimization, small solution size, and seamless mode transitions.
FAQ
What is the maximum input voltage rating for the LTC3624EDD#TRPBF?
The LTC3624EDD#TRPBF has an absolute maximum input voltage rating of 17V. Operation above this level risks permanent damage. Its overvoltage lockout activates at 19V (rising) and releases at 18.5V, providing transient protection. For sustained operation, VIN must remain ≤17V, and the recommended operating range is 2.7V to 17V per the datasheet specifications.
Does the LTC3624EDD#TRPBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC3624EDD#TRPBF supports true 100% duty cycle operation in dropout, allowing VOUT regulation even when VIN approaches VOUT. This is inherent to its architecture and requires no external configuration - it activates automatically when the control loop demands maximum on-time. In Burst Mode® or pulse-skipping, the part cycles in/out of sleep to maintain regulation with ultralow IQ; in forced continuous mode, the high-side PMOS remains fully on.
How does the MODE/SYNC pin configure operating modes on the LTC3624EDD#TRPBF?
The MODE/SYNC pin on the LTC3624EDD#TRPBF selects three distinct modes: tie to INTVCC for Burst Mode® (3.5µA IQ, 800mA peak clamp), tie to GND for pulse-skipping (lowest VOUT ripple), or apply 1.0V–2.4V for forced continuous mode. It also accepts external clock signals for synchronization across ±40% of 2.25MHz - no additional components required beyond proper decoupling.
What is the thermal performance of the LTC3624EDD#TRPBF in its DFN package?
The LTC3624EDD#TRPBF in the 8-lead 3mm × 3mm DFN package has θJA = 43°C/W and θJC = 5.5°C/W. Its exposed thermal pad (Pin 9) must be soldered to a PCB ground plane for rated performance. At 2A load and 12V input, typical junction temperature rise is ~45°C above ambient - well within the –40°C to 125°C operating range when board layout follows Linear's recommended copper pour guidelines.
Can the LTC3624EDD#TRPBF be used with fixed output voltages like 3.3V or 5V?
No - the LTC3624EDD#TRPBF is the adjustable version (VOUT = 0.6V × [1 + R2/R1]). Fixed-output variants exist (e.g., LTC3624EDD-23.3#TRPBF for 3.3V at 2.25MHz), but the LTC3624EDD#TRPBF requires an external resistor divider on the FB pin. Using it as a fixed-output regulator would require precise resistor selection and validation against ±1% reference tolerance and layout parasitics.
LTC3624EDD#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:
- 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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3624EDD#TRPBF FAQ
1.How can I place an order for LTC3624EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EDD#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#TRPBF reliable?
The price and inventory of LTC3624EDD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EDD#TRPBF?
LTC3624EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EDD#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#TRPBF?
For technical support, including LTC3624EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3624EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EDD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624EDD#TRPBF?
All LTC3624EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EDD#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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