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Analog Devices Inc. LTC3624IDD-3.3#TRPBF
- Part No.:
- LTC3624IDD-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3624IDD-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
LTC3624IDD-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC regulator in a compact 8-lead DFN package, delivering fixed 3.3V output with ±1% accuracy, 1MHz switching frequency, and ultralow 3.5µA quiescent current in shutdown-ideal for battery-powered instrumentation and emergency radios requiring long standby life.
For engineers reviewing the LTC3624IDD-3.3#TRPBF datasheet, LTC3624IDD-3.3#TRPBF pinout, LTC3624IDD-3.3#TRPBF application, or LTC3624IDD-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output, 1MHz constant-frequency operation, Burst Mode® efficiency at light loads, thermal performance in the 3mm × 3mm DFN, and compatibility with ceramic input/output capacitors in space-constrained portable designs.
Technical Context
The LTC3624IDD-3.3#TRPBF employs a peak current-mode control architecture with internal compensation, enabling stable regulation across 2.7V–17V input while maintaining ±1% VOUT accuracy over temperature and load. Its fixed 3.3V output eliminates external feedback resistors, and the MODE/SYNC pin supports Burst Mode® (for <3.5µA IQ), pulse-skipping (low ripple), or forced continuous mode (for EMI-sensitive applications).
It integrates both PMOS high-side and NMOS low-side power switches with RDS(ON) of 200mΩ (top) and 115mΩ (bottom) at VIN = 5V, supports 100% duty-cycle dropout operation, and features overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V), all within a –40°C to 125°C operating junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates external resistor divider; ensures precise rail for 3.3V logic and analog circuitry. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.7–3.6V), and 12V industrial rails. |
| Max Output Current | 2A continuous - sustains full load without thermal derating in typical PCB layouts with exposed pad soldered. |
| Quiescent Current | 3.5µA in shutdown - enables multi-year battery life in always-on sensor nodes or emergency devices. |
| Switching Frequency | 1MHz ±8% - allows use of small 2.2µH inductors and 4.7µF–22µF ceramic output capacitors; reduces EMI compared to sub-MHz converters. |
| Efficiency Peak | 95% at 5VIN/3.3VOUT, 1A - minimizes thermal rise in sealed enclosures and extends runtime in portable equipment. |
| Thermal Performance | θJA = 43°C/W - requires only minimal copper area on PCB; exposed pad must be soldered to GND for rated performance. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for electrical integrity and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave; must be routed with short, low-inductance trace to minimize EMI and voltage spikes. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; bypass with ≥10µF ceramic capacitor placed adjacent to pin to suppress high-frequency noise. |
| RUN (Pin 3) | Enable control | Active-high logic input; tie to VIN or microcontroller GPIO; floating is prohibited-must be pulled high or low. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output; pulls low if VOUT deviates >±7.5% from 3.3V; includes 32-cycle blanking to reject transient glitches. |
| FB (Pin 5) | Feedback reference | Internally connected to 3.3V output; no external divider required-simplifies layout and improves accuracy vs adjustable versions. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V regulated supply for internal circuitry; bypass with ≥2.2µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 7) | Operating mode select | Tie to INTVCC for Burst Mode® (lowest IQ), GND for pulse-skipping (lowest ripple), or 1V–2.4V for forced continuous mode. |
| GND (Pins 8 & Exposed Pad) | Signal and power ground | Primary return path for SW, VIN, and INTVCC currents; exposed pad must be fully soldered to maximize thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow shutdown IQ | 3.5µA - enables multi-year battery life in IoT sensors and backup systems without manual power cycling. |
| Fixed 3.3V output | No external feedback resistors needed - reduces BOM count, layout area, and potential drift from resistor tolerance/temperature. |
| 100% duty-cycle operation | Maintains regulation down to VIN = VOUT - critical for brownout resilience in battery-powered systems nearing end-of-life. |
| Internal soft-start | 1ms ramp - prevents inrush current into output capacitors and avoids false PGOOD assertion during startup. |
| Overtemperature protection | Thermal shutdown at TJ > 125°C - safeguards against sustained overload or inadequate heatsinking without external circuitry. |
| Synchronization capability | ±40% capture range around 1MHz - allows EMI reduction via spread-spectrum clocking or phase alignment with other converters. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeters and handheld oscilloscopes powered by two AA cells (2.7–3.6V) requiring stable 3.3V for MCU, ADC, and display backlight. IC Role / Device Role / Timing Role: Primary step-down regulator supplying clean 3.3V rail; operates in Burst Mode® during measurement idle to extend battery life. Use Value: 3.5µA shutdown IQ and 100% duty-cycle operation enable >1-year shelf life and reliable operation down to 2.7V input. | Use Scenario: Hand-crank or solar-charged emergency radios needing regulated 3.3V for RF front-end and digital baseband under highly variable input conditions. IC Role / Device Role / Timing Role: Input-conditioning buck converter accepting wide 2.7–17V input; delivers precise 3.3V with fast load transient response for burst TX/RX cycles. Use Value: 95% peak efficiency and ±1% output accuracy ensure maximum usable energy extraction and consistent RF performance across battery states. |
| Portable Medical Sensors | Industrial Data Loggers |
Use Scenario: Wearable ECG monitors using coin-cell batteries (3V nominal) that must operate continuously for 72+ hours per charge. IC Role / Device Role / Timing Role: Main power supply for ultra-low-power MCU and analog front-end; enters Burst Mode® between sampling intervals. Use Value: 3.5µA quiescent current directly translates to >10% longer runtime versus comparable 10µA-Q devices at µA-level average loads. | Use Scenario: Ruggedized field loggers deployed in remote locations, powered by 12V lead-acid or PoE-derived supplies with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust 3.3V supply tolerant of automotive-grade transients; uses forced continuous mode to meet EMI compliance in noisy environments. Use Value: –40°C to 125°C guaranteed operation and VIN OVP (19V) prevent failure during load-dump events or cold-start conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864DLCR | 2.5V–5.5V input, 3.3V fixed, 2A, 2.25MHz, 0.5µA shutdown IQ | Lower input voltage ceiling (5.5V max); unsuitable for 12V input or wide-VIN industrial use | Select when input is strictly ≤5.5V and lowest possible shutdown IQ is critical; verify thermal performance in DFN1212. |
| MP2451DT-LF-Z | 4.75V–28V input, 3.3V fixed, 2A, 500kHz, 100µA quiescent current | Higher IQ (100µA vs 3.5µA); lower switching frequency requires larger magnetics | Select when cost sensitivity outweighs battery life; acceptable for line-powered or short-duration portable use. |
Compared with TPS62864DLCR and MP2451DT-LF-Z, the LTC3624IDD-3.3#TRPBF uniquely balances wide 2.7–17V input, ultralow 3.5µA shutdown IQ, and 1MHz operation in a thermally optimized 3mm × 3mm DFN-making it optimal for long-life, wide-input, space-constrained battery systems where efficiency at microamp loads is non-negotiable.
Availability
LTC3624IDD-3.3#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 parametric performance across –40°C to 125°C.
Supply support for LTC3624IDD-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 legacy of high-performance power management ICs with rigorous characterization and automotive/industrial qualification.
The LTC3624 series is designed for ultralow-quiescent-current, wide-input synchronous buck conversion in portable and energy-harvesting applications-emphasizing efficiency at light loads without sacrificing transient response or thermal robustness.
FAQ
What is the guaranteed operating temperature range for the LTC3624IDD-3.3#TRPBF?
The LTC3624IDD-3.3#TRPBF is specified and guaranteed over a junction temperature range of –40°C to 125°C. This "I-grade" rating is confirmed in the Order Information table and applies to all electrical characteristics unless otherwise noted. The device includes overtemperature protection that activates above 125°C to prevent permanent damage during momentary overload conditions.
Does the LTC3624IDD-3.3#TRPBF require external feedback resistors to set the output voltage?
No, the LTC3624IDD-3.3#TRPBF does not require external feedback resistors. It is a fixed-output variant with internal feedback network configured for 3.3V ±1%. The FB pin is internally tied to the output, eliminating resistor placement, tolerance errors, and board space-unlike adjustable versions such as the LTC3624IDD#TRPBF.
How does the MODE/SYNC pin function on the LTC3624IDD-3.3#TRPBF?
The MODE/SYNC pin on the LTC3624IDD-3.3#TRPBF selects operating mode: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest output ripple), or apply 1.0V–2.4V for forced continuous conduction. It also accepts an external clock signal within ±40% of 1MHz to synchronize switching and reduce EMI.
What is the minimum recommended input capacitance for the LTC3624IDD-3.3#TRPBF?
The minimum recommended input capacitance for the LTC3624IDD-3.3#TRPBF is 10µF ceramic (X5R/X7R dielectric), placed as close as possible to the VIN and GND pins. This value satisfies RMS current handling and high-frequency bypassing requirements across the full 2.7V–17V input range and supports stable operation under dynamic load steps.
Is the exposed thermal pad on the LTC3624IDD-3.3#TRPBF electrically connected, and how must it be handled?
Yes, the exposed thermal pad (Pin 9) on the LTC3624IDD-3.3#TRPBF is electrically connected to GND and must be soldered to a PCB ground plane. Per the Absolute Maximum Ratings and Pin Configuration diagrams, failure to solder this pad degrades thermal performance (θJA increases significantly) and may compromise reliability under sustained 2A loads.
LTC3624IDD-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)
LTC3624IDD-3.3#TRPBF FAQ
1.How can I place an order for LTC3624IDD-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IDD-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 LTC3624IDD-3.3#TRPBF reliable?
The price and inventory of LTC3624IDD-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 LTC3624IDD-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624IDD-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IDD-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IDD-3.3#TRPBF?
LTC3624IDD-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IDD-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 LTC3624IDD-3.3#TRPBF?
For technical support, including LTC3624IDD-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IDD-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624IDD-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IDD-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 LTC3624IDD-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624IDD-3.3#TRPBF?
All LTC3624IDD-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IDD-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 LTC3624IDD-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624IDD-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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