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Analog Devices Inc. LTC3624EMSE-23.3#TRPBF
- Part No.:
- LTC3624EMSE-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624EMSE-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
LTC3624EMSE-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 and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports 100% duty cycle dropout, and targets battery-powered portable instrumentation requiring ultra-low IQ and compact footprint.
For engineers reviewing the LTC3624EMSE-23.3#TRPBF datasheet, LTC3624EMSE-23.3#TRPBF pinout, LTC3624EMSE-23.3#TRPBF application, or LTC3624EMSE-23.3#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency, 3.3V fixed output, 12-lead MSOP package with exposed thermal pad, Burst Mode® operation for light-load efficiency, and PGOOD indicator for system power sequencing.
Technical Context
The LTC3624EMSE-23.3#TRPBF employs constant-frequency peak current mode control with internal compensation and 1ms soft-start. Its 2.25MHz oscillator enables compact external components and supports ±40% synchronization range via the MODE/SYNC pin.
It integrates complementary PMOS/NMOS power switches with 200mΩ/115mΩ on-resistances, delivers regulated 3.3V output directly from FB-to-VOUT connection, and features overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback divider; ensures stable rail for MCU I/O or RF subsystems. |
| Switching Frequency | 2.25MHz (±40% sync range) - enables use of sub-3µH inductors and <10µF ceramic output capacitors. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on sensor nodes or emergency radios during standby. |
| 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 - sufficient for powering ARM Cortex-M microcontrollers with peripherals or FPGA core rails. |
| Efficiency Peak | 95% at full load - minimizes thermal rise in sealed enclosures and reduces heatsinking requirements. |
| Thermal Shutdown | 150°C junction limit - protects device under overload or poor PCB thermal design without external circuitry. |
Pinout & Package
12-lead plastic MSOP package (3mm × 4.4mm) with exposed thermal pad (Pin 13) soldered to PCB ground for optimal thermal performance (θJA = 40°C/W, θJC = 10°C/W). Pin 7 is NC (no connect) in MSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node | Connects to inductor; carries high di/dt square wave - requires tight layout and low-inductance path to minimize EMI. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7–17V; powers internal LDO (INTVCC) and high-side PMOS gate drive - bypass with ≥10µF ceramic near pin. |
| RUN (Pin 5) | Enable control | Active-high logic input; pulling low disables regulator and reduces VIN current to 0.1µA - used for system-level power gating. |
| PGOOD (Pin 6) | Power good indicator | Open-drain output pulled low if VOUT deviates >±7.5% - provides 32-cycle blanking to reject transient glitches. |
| FB (Pin 8) | Feedback reference | Internally tied to 3.3V output in fixed-VOUT version - no external resistor divider required. |
| INTVCC (Pin 9) | Bias LDO output | 3.6V regulated supply for gate drivers and logic - must be bypassed with ≥2.2µF ceramic to GND. |
| MODE/SYNC (Pin 10) | Operating mode select | Tie to INTVCC for Burst Mode (3.5µA IQ), GND for pulse-skipping (low ripple), or external clock for sync - enables dynamic trade-off between efficiency and noise. |
| GND (Pins 11,12,13) | Signal & power ground | Exposed pad (Pin 13) is mandatory GND connection - primary thermal path and return for high-current loops. |
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 edge sensors. |
| 100% duty cycle dropout | Supports VOUT = VIN operation down to 2.7V input - enables seamless transition during battery voltage sag without rail collapse. |
| Internal soft-start | 1ms monotonic ramp prevents inrush current and output overshoot - eliminates need for external timing components. |
| Integrated power switches | Complementary PMOS/NMOS with 200mΩ/115mΩ RDS(ON) - removes external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| PGOOD with blanking | 32-cycle delay on falling edge rejects transient dips - ensures reliable power sequencing in multi-rail systems without false resets. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeter or gas detector operating from two AA alkaline cells (2.7–3.6V) with LCD display and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator supplying MCU, analog front-end, and wireless transceiver. Use Value: 3.5µA quiescent current extends shelf life beyond 5 years; 2.25MHz switching allows tiny 2.2µH inductor and 10µF ceramic output cap. | Use Scenario: Solar-charged emergency beacon with supercapacitor backup, requiring reliable 3.3V rail during intermittent sunlight. IC Role / Device Role / Timing Role: Main DC/DC converter enabling low-power sleep mode and fast wake-up for GPS transmission bursts. Use Value: 100% duty cycle operation sustains 3.3V output as supercapacitor discharges from 4.0V to 3.3V; PGOOD confirms rail stability before RF activation. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: DIN-rail mounted PLC module converting 12V field bus to clean 3.3V for digital I/O and communication ICs. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated, low-noise 3.3V supply with robust input protection. Use Value: VIN OVP (19V) and UVLO (2.7V) protect against 24V transients and brownouts; 95% efficiency minimizes thermal stress in confined enclosures. | Use Scenario: Wireless vibration sensor node powered by energy harvesting, requiring micropower operation between data transmissions. IC Role / Device Role / Timing Role: System power manager that conditions harvested energy into stable 3.3V for ultra-low-power MCU and MEMS accelerometer. Use Value: Burst Mode® IQ of 3.5µA matches typical energy harvester output (1–10µW); MODE/SYNC pin enables firmware-controlled ripple/efficiency tuning. |
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 | 2.4–5.5V input, 3.3V fixed, 1.8µA IQ, 2.25MHz - lower IQ but narrower VIN range and no 17V tolerance. | Suitable only for single-cell Li-ion or USB-powered devices; cannot replace LTC3624EMSE-23.3#TRPBF in 12V or wide-VIN industrial designs. | Select when ultra-low IQ dominates and input is strictly ≤5.5V; verify thermal performance at 2A in MSOP-12 footprint. |
| MP2143GJ-Z | 4.5–17V input, 3.3V fixed, 25µA IQ, 2.2MHz - higher IQ and no Burst Mode, but AEC-Q200 qualified. | Targeted at automotive body electronics; lacks ultralow-IQ capability for battery longevity-critical applications. | Choose for automotive environments requiring qualification; avoid where multi-year battery life is mandatory. |
Compared with TPS62840DRVR and MP2143GJ-Z, the LTC3624EMSE-23.3#TRPBF uniquely combines 17V input tolerance, 3.5µA IQ, and 2.25MHz fixed frequency in a thermally enhanced MSOP package - making it optimal for wide-input, long-life portable industrial equipment.
Availability
LTC3624EMSE-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.
Supply support for LTC3624EMSE-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 acquired Linear Technology in 2017 and maintains its precision power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained, battery-sensitive applications - emphasizing reliability across extended temperature ranges (–40°C to 125°C).
FAQ
What is the input voltage range supported by the LTC3624EMSE-23.3#TRPBF?
The LTC3624EMSE-23.3#TRPBF supports an input voltage range of 2.7V to 17V. This allows operation from single-cell Li-ion batteries (3.0–4.2V), dual-cell alkaline sources (2.7–3.6V), and standard 12V industrial rails. Absolute maximum rating is 17V, with overvoltage lockout engaging at 19V to protect internal MOSFETs. The part remains functional down to 2.7V, below which undervoltage lockout disables regulation.
Does the LTC3624EMSE-23.3#TRPBF require external feedback resistors?
No, the LTC3624EMSE-23.3#TRPBF does not require external feedback resistors. As a fixed 3.3V output variant, the FB pin is internally connected to the regulated output. Users must connect FB directly to VOUT per the datasheet; adding external resistors will disrupt regulation and may cause instability or incorrect output voltage.
How does the MODE/SYNC pin function on the LTC3624EMSE-23.3#TRPBF?
The MODE/SYNC pin on the LTC3624EMSE-23.3#TRPBF selects operating mode: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply an external clock (2.05–2.45MHz) for synchronization. In forced continuous mode, apply 1.0–2.4V. The pin also serves as the sync input - once locked, the part immediately runs at the external frequency with ±40% capture range.
What thermal considerations apply to the LTC3624EMSE-23.3#TRPBF in MSOP package?
The LTC3624EMSE-23.3#TRPBF in 12-lead MSOP requires soldering of the exposed thermal pad (Pin 13) to a PCB ground plane for thermal performance. With θJA = 40°C/W, a 4cm² 2-oz copper pour reduces junction-to-ambient rise to ~40°C at 2A full load. Without proper pad connection, thermal resistance increases significantly, risking thermal shutdown at lower currents. The device includes internal overtemperature protection triggering at 150°C.
Can the LTC3624EMSE-23.3#TRPBF operate in 100% duty cycle dropout mode?
Yes, the LTC3624EMSE-23.3#TRPBF supports true 100% duty cycle operation, maintaining 3.3V output even when VIN drops to 3.3V. This dropout capability is enabled by its PMOS high-side switch and internal control architecture. During dropout, the top switch remains fully on, minimizing conduction loss. Efficiency remains high due to low RDS(ON) (200mΩ), and regulation is maintained without external components or mode changes.
LTC3624EMSE-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
LTC3624EMSE-23.3#TRPBF FAQ
1.How can I place an order for LTC3624EMSE-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EMSE-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 LTC3624EMSE-23.3#TRPBF reliable?
The price and inventory of LTC3624EMSE-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 LTC3624EMSE-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624EMSE-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EMSE-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EMSE-23.3#TRPBF?
LTC3624EMSE-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EMSE-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 LTC3624EMSE-23.3#TRPBF?
For technical support, including LTC3624EMSE-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EMSE-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624EMSE-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EMSE-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 LTC3624EMSE-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624EMSE-23.3#TRPBF?
All LTC3624EMSE-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EMSE-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 LTC3624EMSE-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624EMSE-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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