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Analog Devices Inc. LTC3624EMSE-3.3#TRPBF
- Part No.:
- LTC3624EMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624EMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,981
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Product details
Overview
LTC3624EMSE-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC regulator in a 12-lead MSOP package, delivering a fixed 3.3V output with ±1% accuracy, 1MHz switching frequency, and ultralow 3.5µA quiescent current in shutdown - optimized for battery-powered portable instrumentation and emergency radios.
For engineers reviewing the LTC3624EMSE-3.3#TRPBF datasheet, LTC3624EMSE-3.3#TRPBF pinout, LTC3624EMSE-3.3#TRPBF application, or LTC3624EMSE-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output, 1MHz constant-frequency operation, Burst Mode® efficiency at light loads, integrated soft-start, and thermal performance in the exposed-pad MSOP package.
Technical Context
The LTC3624EMSE-3.3#TRPBF employs peak current-mode control with internal compensation, enabling stable regulation across 2.7V–17V input while maintaining ±1% VOUT accuracy. Its 1MHz fixed oscillator supports ±40% external synchronization via the MODE/SYNC pin and features programmable operating modes: Burst Mode® (3.5µA IQ), pulse-skipping (low ripple), or forced continuous (fast transient response).
It integrates PMOS/NMOS synchronous power switches (RDS(ON) = 200mΩ/115mΩ at VIN = 5V), overtemperature protection, PGOOD with 32-cycle blanking delay, and low-dropout 100% duty-cycle capability - all within a thermally enhanced 12-lead MSOP with exposed GND pad soldered to PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback divider and ensures precise rail generation for MCU I/O or logic supplies. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion, multi-cell alkaline, and industrial 12V bus inputs without pre-regulation. |
| Max Output Current | 2A continuous - sustains full load under worst-case thermal conditions (θJA = 40°C/W, TJ ≤ 125°C). |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on monitoring systems with infrequent wake-up cycles. |
| Switching Frequency | 1MHz ±8% (E-grade) - enables compact 2.2µH inductors and low-profile ceramic capacitors while avoiding AM radio band interference. |
| Efficiency Peak | 95% at 5VIN/3.3VOUT, 1A - minimizes thermal rise in sealed enclosures and reduces system-level cooling requirements. |
| PGOOD Accuracy | ±7.5% window - provides reliable power sequencing indication for downstream FPGAs or processors requiring strict supply validation. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.02mm) with exposed thermal pad (Pin 13), rated for –40°C to +125°C junction temperature and θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node | Connects to inductor; carries high di/dt square-wave current - requires tight layout and Kelvin connection to minimize EMI and voltage spikes. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side PMOS gate driver - bypass with ≥10µF ceramic near pin. |
| RUN (Pin 5) | Enable control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float; internal pull-down provided. |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; 32-cycle blanking prevents false triggers during load transients. |
| FB (Pin 8) | Feedback reference | Internally tied to 3.3V output (fixed version); no external resistor divider required - simplifies layout and improves noise immunity. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; requires ≥2.2µF ceramic bypass to GND for stability and transient response. |
| MODE/SYNC (Pin 10) | Operating mode select | Tie to INTVCC for Burst Mode® (3.5µA IQ), GND for pulse-skipping (low ripple), or 1V–2.4V for forced continuous sync to external clock. |
| GND (Pins 11,12,13) | Signal & power ground | Exposes thermal pad (Pin 13) - must be soldered to large PCB copper area for thermal dissipation and low-noise grounding. |
| NC (Pin 7) | No connect | Unbonded terminal - leave unconnected; no electrical function or thermal benefit. |
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. |
| Integrated soft-start | 1ms internal ramp prevents inrush current and output overshoot during power-up - eliminates need for external timing components. |
| Synchronous MOSFETs | On-resistances of 200mΩ (PMOS) and 115mΩ (NMOS) minimize conduction loss - enables >90% efficiency down to 10mA load. |
| Overtemperature protection | Thermal shutdown activates above TJ = 150°C (H-grade spec) - protects against sustained overload or poor heatsinking without external circuitry. |
| 100% duty-cycle dropout | Maintains regulation as VIN approaches VOUT (e.g., 3.6V → 3.3V) - supports brownout operation in battery discharge scenarios. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by two AA alkaline cells (2.4V–3.2V) requiring stable 3.3V for microcontroller and ADC. IC Role / Device Role / Timing Role: Primary step-down regulator delivering fixed 3.3V with ultralow IQ to maximize runtime between battery replacements. Use Value: 3.5µA shutdown current extends shelf life beyond 5 years; 100% duty cycle maintains regulation until battery reaches 3.3V cutoff. | Use Scenario: Solar-charged emergency radios operating from 3.6V–17V input range, needing clean 3.3V for RF front-end and digital baseband. IC Role / Device Role / Timing Role: Main power converter with PGOOD signaling to enable RF transmit only when VOUT is valid and stable. Use Value: ±7.5% PGOOD window ensures reliable RF startup; 1MHz switching avoids interference with 27MHz CB band reception. |
| General Purpose Step-Down Supplies | Industrial Control Sensors |
Use Scenario: DIN-rail mounted PLC modules converting 12V/24V bus to 3.3V for isolated communication interfaces (RS-485, CAN). IC Role / Device Role / Timing Role: Compact, thermally robust point-of-load regulator with exposed-pad MSOP enabling convection-only cooling in confined spaces. Use Value: θJA = 40°C/W allows 2A operation at TA = 70°C without heatsink; SYNC pin enables system-wide clock alignment to reduce EMI. | Use Scenario: Loop-powered 4–20mA field sensors with auxiliary 3.3V supply derived from 24V loop voltage. IC Role / Device Role / Timing Role: High-input-voltage buck converter operating in dropout (VIN ≈ VOUT) during low-loop-current conditions. Use Value: 100% duty cycle and 2.7V UVLO ensure uninterrupted 3.3V output even at 3.6V loop voltage - critical for sensor self-test functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864DRLR | 2.5V–5.5V input, 3.3V fixed, 2A, 2.25MHz, 0.5µA shutdown IQ | Narrower VIN range limits use with >5.5V sources; higher switching frequency demands smaller inductors but increases EMI risk. | Select for ultra-low-IQ battery systems with VIN ≤ 5.5V and space-constrained layouts requiring <1mm height inductors. |
| MP2451DT-LF-Z | 4.5V–36V input, 3.3V fixed, 2A, 2MHz, 260µA quiescent current | Higher IQ degrades battery life; wider VIN suits 24V industrial rails but lacks Burst Mode® efficiency below 10mA. | Select for cost-sensitive 24V industrial supplies where 260µA IQ is acceptable and thermal margin exceeds 30°C. |
Compared with TPS62864DRLR and MP2451DT-LF-Z, the LTC3624EMSE-3.3#TRPBF uniquely balances wide 2.7V–17V input compatibility, 3.5µA shutdown IQ, and 1MHz operation - making it optimal for dual-role battery/bus-powered devices requiring both long shelf life and robust transient response.
Availability
LTC3624EMSE-3.3#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, emergency radios, and industrial control sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624EMSE-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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, aerospace, and industrial markets.
The LTC3624 product line was designed specifically for high-efficiency, ultralow-quiescent-current DC/DC conversion in space- and energy-constrained portable and remote applications - emphasizing thermal robustness, mode flexibility, and fixed-output simplicity.
FAQ
What is the maximum input voltage rating for the LTC3624EMSE-3.3#TRPBF?
The LTC3624EMSE-3.3#TRPBF has an absolute maximum VIN rating of 17V. Operation above this voltage risks permanent damage. The device includes VIN overvoltage lockout that suspends switching when VIN exceeds 19V (typical) and resumes once VIN drops below 18.5V - protecting internal MOSFETs during transient spikes. For continuous operation, keep VIN ≤ 17V.
Does the LTC3624EMSE-3.3#TRPBF require external feedback resistors?
No, the LTC3624EMSE-3.3#TRPBF does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to the 3.3V output - eliminating the need for a resistor divider and reducing component count, layout area, and potential noise coupling. This simplifies design and improves reliability in compact portable systems.
How does the MODE/SYNC pin configure operating modes on the LTC3624EMSE-3.3#TRPBF?
The MODE/SYNC pin on the LTC3624EMSE-3.3#TRPBF selects three distinct modes: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest output ripple), or apply 1V–2.4V for forced continuous mode (best transient response). It also accepts external clocks within ±40% of 1MHz for synchronization - enabling EMI reduction in dense PCB layouts.
What thermal considerations apply to the LTC3624EMSE-3.3#TRPBF in MSOP package?
The LTC3624EMSE-3.3#TRPBF uses a 12-lead MSOP with exposed GND pad (Pin 13) that must be soldered to a minimum 100mm² PCB copper area for thermal performance. With θJA = 40°C/W, it delivers 2A continuously at TA = 70°C. Insufficient pad soldering or undersized copper raises junction temperature, potentially triggering thermal shutdown or degrading long-term reliability.
Is the LTC3624EMSE-3.3#TRPBF RoHS-compliant and lead-free?
Yes, the LTC3624EMSE-3.3#TRPBF is RoHS-compliant and features a lead-free finish, as indicated by the "#TRPBF" suffix per Analog Devices' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is compatible with standard Pb-free reflow profiles. Full compliance documentation is available in the official Analog Devices product page and material declarations.
LTC3624EMSE-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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:
- 12-MSOP-EP
LTC3624EMSE-3.3#TRPBF FAQ
1.How can I place an order for LTC3624EMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EMSE-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 LTC3624EMSE-3.3#TRPBF reliable?
The price and inventory of LTC3624EMSE-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 LTC3624EMSE-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624EMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EMSE-3.3#TRPBF?
LTC3624EMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EMSE-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 LTC3624EMSE-3.3#TRPBF?
For technical support, including LTC3624EMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624EMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EMSE-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 LTC3624EMSE-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624EMSE-3.3#TRPBF?
All LTC3624EMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EMSE-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 LTC3624EMSE-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624EMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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