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Analog Devices Inc. LTC3624IMSE-23.3#TRPBF
- Part No.:
- LTC3624IMSE-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624IMSE-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
LTC3624IMSE-23.3#TRPBF 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 LTC3624IMSE-23.3#TRPBF datasheet, LTC3624IMSE-23.3#TRPBF pinout, LTC3624IMSE-23.3#TRPBF application, or LTC3624IMSE-23.3#TRPBF 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 for sub-10µA light-load IQ, and MSOP-12 package with exposed thermal pad for industrial temperature range (–40°C to 125°C).
Technical Context
The LTC3624IMSE-23.3#TRPBF employs constant-frequency peak current mode control with internal slope compensation, enabling stable regulation across wide VIN/VOUT ranges and fast transient response. Its MODE/SYNC pin supports three operating modes-Burst Mode® (800mA clamp), pulse-skipping (132mA clamp), and forced continuous-with automatic mode transition based on load.
It integrates dual MOSFETs (PMOS high-side, NMOS low-side), an internal 3.6V LDO (INTVCC), overtemperature protection, VIN overvoltage lockout (19V trip), and PGOOD with 32-cycle blanking delay. The 60ns minimum on-time constrains practical minimum duty cycle to 13.5% at 2.25MHz, limiting lowest usable VOUT at high VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz ±10% (E/I-grade); enables use of small 2.2µH inductors and <10µF ceramic output capacitors |
| Output Voltage | Fixed 3.3V ±1% (3.267V–3.333V); eliminates external resistor divider and associated tolerance/temperature drift |
| Max Output Current | 2A continuous; supported by integrated 200mΩ PMOS and 115mΩ NMOS switches with thermal derating above 85°C |
| Quiescent Current | 3.5µA in shutdown; 1.8mA typical in forced continuous mode; enables >1-year battery life in always-on sensor nodes |
| Input Voltage Range | 2.7V to 17V; accommodates single-cell LiFePO₄ (2.8–3.6V), dual-cell alkaline (2.7–3.2V), and 12V industrial rails |
| Feedback Reference | 0.6V internal reference; used internally for fixed-output variants-no external FB connection required |
| Thermal Rating | –40°C to +125°C junction; MSOP-12 package with exposed pad achieves θJA = 40°C/W, θJC = 10°C/W |
Pinout & Package
Package: 12-Lead Plastic MSOP with exposed thermal pad (Pin 13), RoHS-compliant, lead-free finish. Requires soldering of exposed pad to PCB ground plane for rated thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 / SW | Switch Node | Connection to inductor; carries high di/dt square wave; requires tight layout and Kelvin return path to minimize EMI |
| 3, 4 / VIN | Main Input Supply | Accepts 2.7V–17V; must be bypassed with ≥10µF ceramic capacitor placed adjacent to pins |
| 5 / RUN | Enable Control | Active-high logic input; 0.35V threshold; must not float; pulls internal bias circuits on/off |
| 6 / PGOOD | Power-Good Indicator | Open-drain output; pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking to suppress transients |
| 8 / FB | Feedback Input | Internally connected to 3.3V output in fixed-VOUT variant; no external connection required |
| 9 / INTVCC | Internal LDO Output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic to GND |
| 10 / MODE/SYNC | Operating Mode Select | Tied to INTVCC for Burst Mode®; grounded for pulse-skipping; 1V–2.4V for forced continuous; accepts external clock sync |
| 11, 12, 13 / GND | Signal & Power Ground | Pins 11/12 are signal GND; Pin 13 is exposed thermal pad-must be soldered to solid GND plane |
| 7 / NC | No Connect | Electrically isolated; no internal bond wire; must remain unconnected on PCB |
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 VOUT regulation down to VIN – 0.1V; supports brownout operation during battery discharge without rail collapse |
| Integrated Soft-Start | 1ms internal ramp prevents inrush current and output overshoot during power-up-eliminates need for external timing components |
| VIN Overvoltage Protection | Auto-suspends switching at 19V VIN and resumes at 18.5V-protects internal FETs from automotive load-dump transients |
| Current Mode Control | Delivers <10µs load transient recovery with minimal output droop-suitable for FPGA core supplies with dynamic current steps |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by two AA cells (2.7–3.2V) requiring clean, regulated 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator with ultralow IQ to maximize battery runtime between calibrations. Use Value: 3.5µA shutdown IQ extends shelf life beyond 5 years; 2.25MHz switching allows use of tiny 2.2µH inductors and 10µF X7R ceramics-reducing board area by >40% vs. 1MHz alternatives. | Use Scenario: Solar-charged emergency radios storing energy in supercapacitors (2.5–3.0V) that must deliver stable 3.3V to RF front-end and audio amplifier. IC Role / Device Role / Timing Role: Step-down regulator operating in 100% duty cycle dropout mode during low-input conditions to sustain radio functionality. Use Value: Maintains regulation down to VIN = VOUT – 0.1V; Burst Mode® ensures <10µA average current draw during standby-enabling weeks of listen-only operation. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: DIN-rail mounted PLC I/O modules converting 12V/24V field bus to 3.3V for digital isolators and CAN transceivers. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter replacing discrete buck solutions with external controllers. Use Value: MSOP-12 package with exposed pad delivers 2A at 125°C ambient without heatsink; ±1% output accuracy ensures reliable logic-level compatibility. | Use Scenario: Wireless vibration sensors in factory machinery powered by primary lithium batteries (3.6V), transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Always-on power supply enabling microsecond wake-up from deep sleep with zero output droop. Use Value: Internal 1ms soft-start and current-mode control limit startup overshoot to <20mV; 3.5µA IQ enables >3-year battery life at 10-second sampling intervals. |
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 | 2.4V–6V input; 3.3V fixed; 1.8µA IQ; 2.25MHz; 1A max output; WSON-8 (2mm × 2mm) | Lower current rating and narrower VIN range; unsuitable for 12V industrial inputs or 2A loads | Select when board space is critical and load ≤1A; verify thermal margin at full load in confined enclosures |
| MP2152GQZ-P | 4.5V–17V input; 3.3V fixed; 25µA IQ; 2.2MHz; 2A max; QFN-10 (3mm × 3mm) | Higher IQ reduces battery life; no Burst Mode®; lacks VIN OVP and PGOOD blanking | Choose for cost-sensitive industrial designs where 25µA IQ is acceptable and transient immunity is less critical |
Compared with TPS62840DLCR and MP2152GQZ-P, the LTC3624IMSE-23.3#TRPBF uniquely combines 2A capability, 3.5µA IQ, 17V VIN, and integrated protection features in a thermally optimized MSOP package-making it the only option for high-reliability, long-life 3.3V conversion across automotive, industrial, and portable domains.
Availability
LTC3624IMSE-23.3#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624IMSE-23.3#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3624 product line was designed by Linear Technology specifically for ultra-low-quiescent-current, high-efficiency synchronous buck conversion in space-constrained, battery-critical applications-emphasizing reliability, thermal robustness, and ease of use without external compensation.
FAQ
What is the maximum output current capability of the LTC3624IMSE-23.3#TRPBF under industrial temperature conditions?
The LTC3624IMSE-23.3#TRPBF delivers up to 2A continuous output current at TA = 25°C. At 125°C ambient, thermal derating reduces usable current to approximately 1.4A due to θJA = 40°C/W and internal power dissipation limits. Derating curves in the datasheet confirm sustained 2A operation is achievable up to 85°C ambient with proper PCB copper pour on the exposed pad.
Does the LTC3624IMSE-23.3#TRPBF require external feedback resistors to set the 3.3V output?
No. The LTC3624IMSE-23.3#TRPBF is a fixed-output variant: the FB pin is internally connected to the regulated 3.3V output, eliminating all external feedback components. This simplifies layout, removes resistor tolerance and temperature drift errors, and improves long-term output stability compared to adjustable versions.
How does the MODE/SYNC pin function in the LTC3624IMSE-23.3#TRPBF, and what are the valid voltage levels?
The MODE/SYNC pin on the LTC3624IMSE-23.3#TRPBF selects operating mode: tie to INTVCC (≈3.6V) for Burst Mode®, ground for pulse-skipping, or apply 1.0V–2.4V for forced continuous mode. It also accepts external clock signals within ±40% of 2.25MHz (1.35–3.15MHz) to synchronize switching-ensuring EMI compliance in dense PCB layouts.
What thermal management requirements apply to the LTC3624IMSE-23.3#TRPBF's exposed pad?
The exposed pad (Pin 13) of the LTC3624IMSE-23.3#TRPBF must be soldered to a solid PCB ground plane using ≥4 thermal vias (0.3mm diameter) to internal GND layers. Failure to do so increases θJA beyond 40°C/W, risking thermal shutdown at >1.5A load. Thermal simulation data confirms 2A operation is sustainable at 125°C ambient only with full-pad soldering and ≥2cm² copper area.
Is the LTC3624IMSE-23.3#TRPBF compatible with ceramic output capacitors, and what type is recommended?
Yes-the LTC3624IMSE-23.3#TRPBF is fully compatible with X5R and X7R dielectric ceramic capacitors. These offer optimal balance of voltage coefficient, temperature stability, and ESR for output filtering. Avoid Y5V/Z5U types due to severe capacitance loss at DC bias and temperature extremes. A typical design uses 22µF/6.3V X7R in parallel with 2.2µF/6.3V X7R for broadband ripple suppression.
LTC3624IMSE-23.3#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624IMSE-23.3#TRPBF FAQ
1.How can I place an order for LTC3624IMSE-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IMSE-23.3#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 LTC3624IMSE-23.3#TRPBF reliable?
The price and inventory of LTC3624IMSE-23.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624IMSE-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624IMSE-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IMSE-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IMSE-23.3#TRPBF?
LTC3624IMSE-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IMSE-23.3#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 LTC3624IMSE-23.3#TRPBF?
For technical support, including LTC3624IMSE-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IMSE-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624IMSE-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IMSE-23.3#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 LTC3624IMSE-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624IMSE-23.3#TRPBF?
All LTC3624IMSE-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IMSE-23.3#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 LTC3624IMSE-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624IMSE-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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