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Analog Devices Inc. LTC3624IDD#TRPBF
- Part No.:
- LTC3624IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,587
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Product details
Overview
LTC3624IDD#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, and adjustable 0.6V–VIN output voltage. It delivers high efficiency (>95%) across wide load ranges and supports Burst Mode®, pulse-skipping, and forced continuous operation - ideal for battery-powered portable instrumentation requiring ultra-low standby power.
For engineers reviewing the LTC3624IDD#TRPBF datasheet, LTC3624IDD#TRPBF pinout, LTC3624IDD#TRPBF application, or LTC3624IDD#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency with ±40% sync range, ±1% output voltage accuracy over temperature, 100% duty-cycle dropout capability, and validated thermal performance up to 125°C junction temperature in the DFN package.
Technical Context
The LTC3624IDD#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling fast line and load transient response. Its dual-MOSFET synchronous rectification uses a PMOS high-side switch (200mΩ at VIN = 5V) and NMOS low-side switch (115mΩ), supporting ultralow IQ operation down to 3.5µA in shutdown and 1.8mA in forced continuous mode.
Operation modes are selected via the MODE/SYNC pin: tied to INTVCC for Burst Mode (800mA clamp, lowest IQ), grounded for pulse-skipping (lowest ripple), or biased between 1V and VINTVCC – 1.2V for forced continuous mode. The device includes integrated soft-start (1ms), overtemperature protection, VIN overvoltage lockout (19V trip), and PGOOD with 32-cycle blanking delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz (±40% sync range); enables compact 2.2µH inductor and <100ns minimum on-time compliance |
| Input Voltage Range | 2.7V to 17V; supports single-cell Li-ion to 12V rail inputs without external pre-regulation |
| Output Voltage Range | 0.6V to VIN (adjustable via FB divider); allows precise regulation from sub-1V logic rails to near-input tracking |
| Max Output Current | 2A continuous; sustained at full load with thermal derating per θJA = 43°C/W in DFN package |
| Quiescent Current | 3.5µA in shutdown, 1.8mA in forced continuous mode; enables >1-year battery life in always-on sensor nodes |
| Feedback Reference | 0.6V ±1% (0.594V–0.606V); sets output accuracy independent of resistor tolerance in divider network |
| Efficiency Peak | 95% at 5VOUT/800mA (12VIN, Burst Mode); minimizes thermal rise in space-constrained PCB layouts |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN (DD) with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJC = 5.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node connection | Drives external inductor; carries high di/dt square-wave current; requires tight layout to minimize EMI and ringing |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers; bypass with ≥10µF ceramic capacitor |
| RUN (Pin 3) | Enable control input | Active-high logic; pulls low to disable regulator and reduce IQ to 0.1µA; must not float |
| PGOOD (Pin 4) | Power-good status indicator | Open-drain output pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking to reject transient glitches |
| FB (Pin 5) | Feedback input | Senses resistive divider output; regulates VOUT = 0.6V × (1 + R2/R1); connects directly to VOUT for fixed-output variants |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic capacitor to GND |
| MODE/SYNC (Pin 7) | Operating mode select / clock sync | Selects Burst Mode (to INTVCC), pulse-skipping (to GND), or forced continuous (1V–VINTVCC–1.2V); accepts external clock for synchronization |
| GND (Pins 8 & 9) | Signal and power ground | Pins 8 (top-side) and 9 (exposed pad) both connect internally to GND; exposed pad must be soldered for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA shutdown IQ extends battery life in emergency radios and IoT sensors with infrequent wake cycles |
| 2.25MHz fixed-frequency operation | Enables use of small 2.2µH inductors and 4.7µF–22µF ceramic output capacitors, reducing solution footprint by >40% vs 500kHz designs |
| Three selectable operating modes | Burst Mode (max efficiency), pulse-skipping (min ripple), forced continuous (fixed frequency); selected via single MODE/SYNC pin voltage |
| 100% duty-cycle dropout support | Maintains regulation as VIN approaches VOUT; critical for Li-ion battery discharge down to 2.7V while powering 3.3V systems |
| Integrated soft-start and protection | 1ms internal soft-start prevents inrush current; overtemperature, VIN OVLO (19V), and PGOOD monitoring ensure robust system-level reliability |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radio Power Management |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes operating from two AA alkaline cells (1.8V–3.2V) or single Li-ion (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V for microcontroller, ADC, and display backlight. Use Value: 3.5µA shutdown IQ preserves battery capacity during storage; 100% duty cycle maintains regulation until battery reaches 2.7V cutoff. |
Use Scenario: Solar-charged emergency radios with wide-input buck conversion for 5V USB output and 3.3V logic rails. IC Role / Device Role / Timing Role: High-efficiency main DC/DC converter accepting 4V–17V solar/battery input and delivering 5V/2A USB power. Use Value: 95% peak efficiency minimizes heat in sealed enclosures; 2.25MHz operation avoids AM radio band interference. |
| General Purpose Step-Down Supply | Low-Power Industrial Sensor Node |
Use Scenario: DIN-rail mounted industrial controllers requiring clean 3.3V/2A from 12V or 24V field bus. IC Role / Device Role / Timing Role: Compact, thermally efficient point-of-load regulator replacing larger discrete solutions. Use Value: DFN package with exposed pad achieves 43°C/W θJA; ±1% VREF ensures accurate analog sensor biasing. |
Use Scenario: Wireless vibration sensors powered by coin-cell batteries (CR2032, 3V) with multi-year lifetime requirements. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter supplying 1.8V to MCU and MEMS accelerometer during periodic wake-up bursts. Use Value: Burst Mode operation draws only 3.5µA between measurements; internal soft-start prevents startup brownouts. |
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 | 1.8V–6.5V input, 0.6V–5.5V output, 1.8A max, 0.36µA IQ (shutdown), 2.25MHz fixed freq | Lower input voltage ceiling (6.5V vs 17V); unsuitable for 12V input or wide-VIN industrial use | Prefer for ultra-low-IQ coin-cell applications where input never exceeds 6.5V |
| MP2451DT-LF-Z | 4.5V–36V input, 0.8V–28V output, 0.6A max, 250µA IQ, 2MHz fixed freq, no Burst Mode | Higher input range but lower current rating and higher IQ; lacks ultralow-power light-load modes | Prefer for cost-sensitive 12V/24V automotive auxiliary supplies where 2A is not required |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the LTC3624IDD#TRPBF uniquely combines 17V input capability, 2A output, 2.25MHz switching, and 3.5µA shutdown IQ - making it the only option among the three suitable for high-current, wide-VIN, battery-critical applications like portable test equipment and emergency comms gear.
Availability
LTC3624IDD#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, emergency radio power management, and general-purpose step-down supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3624IDD#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 characterization and application-focused design.
The LTC3624IDD#TRPBF belongs to the LTC® monolithic synchronous buck regulator family, engineered specifically for ultra-low-quiescent-current, wide-input-voltage, and high-efficiency power conversion in portable and energy-constrained systems.
FAQ
What is the maximum input voltage rating for the LTC3624IDD#TRPBF?
The LTC3624IDD#TRPBF has an absolute maximum input voltage rating of 17V. Operation above this level risks permanent damage. Its VIN overvoltage lockout activates at 19V (trip) with 500mV hysteresis, suspending switching until VIN drops below 18.5V. For reliable 12V system use, the LTC3624IDD#TRPBF provides margin against transients while maintaining full 2A output capability.
How does the MODE/SYNC pin configure operating modes on the LTC3624IDD#TRPBF?
The MODE/SYNC pin on the LTC3624IDD#TRPBF selects three distinct modes: tie to INTVCC for Burst Mode (800mA peak clamp, 3.5µA IQ), ground for pulse-skipping (lowest output ripple), or bias between 1V and VINTVCC – 1.2V for forced continuous mode (fixed 2.25MHz). This single-pin flexibility allows optimization for efficiency, noise, or EMI without external components - a core feature of the LTC3624IDD#TRPBF design.
Does the LTC3624IDD#TRPBF support 100% duty-cycle operation, and what is its significance?
Yes, the LTC3624IDD#TRPBF supports 100% duty-cycle operation, enabling regulation when VIN drops to within ~100mV of VOUT. This is critical for battery-powered systems - for example, sustaining 3.3V output down to a Li-ion cell voltage of 2.7V. The LTC3624IDD#TRPBF achieves this with internal slope compensation and peak current limit maintenance even at high duty cycles, ensuring uninterrupted power during deep discharge.
What is the thermal performance of the LTC3624IDD#TRPBF in its DFN package?
The LTC3624IDD#TRPBF in the 8-lead 3mm × 3mm DFN (DD) package has θJA = 43°C/W and θJC = 5.5°C/W when the exposed pad (Pin 9) is soldered to a minimum 1cm² PCB copper pour. At 2A load and 12VIN/3.3VOUT, typical power dissipation is ~0.4W, resulting in ~17°C rise above ambient - well within the –40°C to 125°C operating junction range. Thermal derating begins above 100°C ambient in enclosed environments.
Can the LTC3624IDD#TRPBF be synchronized to an external clock, and what is the sync range?
Yes, the LTC3624IDD#TRPBF can be synchronized to an external clock applied to the MODE/SYNC pin. Its sync range is ±40% of its nominal 2.25MHz frequency - i.e., 1.35MHz to 3.15MHz. Sync engagement occurs within 2–3 external clock cycles, and loss of sync is detected within ~2µs. This capability allows EMI reduction through frequency dithering or alignment with system clocks - a verified function of the LTC3624IDD#TRPBF.
LTC3624IDD#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)
LTC3624IDD#TRPBF FAQ
1.How can I place an order for LTC3624IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD#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 LTC3624IDD#TRPBF reliable?
The price and inventory of LTC3624IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD#TRPBF?
LTC3624IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD#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 LTC3624IDD#TRPBF?
For technical support, including LTC3624IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3624IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD#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 LTC3624IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD#TRPBF?
All LTC3624IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD#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 LTC3624IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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