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Analog Devices Inc. LTC3624EMSE-3.3#PBF
- Part No.:
- LTC3624EMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624EMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:308
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Product details
Overview
LTC3624EMSE-3.3#PBF 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 3.5µA quiescent current in shutdown - optimized for battery-powered portable instrumentation and emergency radios.
For engineers reviewing the LTC3624EMSE-3.3#PBF datasheet, LTC3624EMSE-3.3#PBF pinout, LTC3624EMSE-3.3#PBF application, or LTC3624EMSE-3.3#PBF equivalent, key selection criteria include its ultralow IQ in Burst Mode, 100% duty-cycle dropout capability, ±7.5% PGOOD window, and MODE/SYNC-configurable operation modes (Burst, pulse-skipping, forced continuous).
Technical Context
The LTC3624EMSE-3.3#PBF employs a constant-frequency peak current mode architecture with internal compensation and 1ms soft-start. It operates from 2.7V to 17V input and sustains regulation down to 100% duty cycle using slope-compensated control to maintain 3A peak current limit even near dropout.
Its MODE/SYNC pin enables three distinct operating modes: tying to INTVCC activates Burst Mode (800mA clamp, 3.5µA IQ), grounding enables pulse-skipping (132mA clamp, low ripple), and applying 1V–(VINTVCC–1.2V) forces continuous conduction - all while supporting external clock synchronization within ±40% of 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (guaranteed over –40°C to 125°C junction) |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery-supplied systems |
| Switching Frequency | 1MHz ±8% (E-grade) - enables compact 2.2µH inductor and low-profile 47µF output cap |
| Quiescent Current | 3.5µA in shutdown, 1.8mA typical in forced continuous mode at light load |
| Max Output Current | 2A continuous - sustained with thermal derating per θJA = 40°C/W (MSOP) |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking delay - prevents false fault triggering during transients |
| Feedback Reference | 0.6V ±0.5% - enables precise output setting; FB pin tied directly to VOUT for fixed 3.3V version |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.4mm) with exposed pad (Pin 13), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1, 2) | Switch node | Connects to inductor; carries high di/dt square-wave current - requires tight layout and Kelvin return path |
| VIN (Pin 3, 4) | Main power input | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side PMOS gate drive |
| RUN (Pin 5) | Enable control | Logic-high (>0.35V) enables regulation; must not float - internal pull-down ensures safe default-off state |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output with 280Ω pulldown; asserts high only when VOUT is within ±7.5% of 3.3V for ≥32 cycles |
| FB (Pin 8) | Feedback sense | Internally connected to VOUT in fixed-3.3V variant; no external divider required |
| INTVCC (Pin 9) | Bias LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic to GND |
| MODE/SYNC (Pin 10) | Mode selection & sync input | Configures Burst/pulse-skipping/forced continuous modes; accepts external 0.6–2.4V clock for ±40% sync range |
| GND (Pins 11, 12, EP) | Signal & power ground | Primary return path for SW, VIN, INTVCC, and PGOOD; exposed pad (Pin 13) is GND and mandatory for thermal performance |
| NC (Pin 7) | No connect | Electrically isolated - no internal connection; leave unconnected or tie to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow shutdown IQ | 3.5µA - extends battery life in always-on portable devices without compromising startup speed |
| 100% duty-cycle operation | Enables dropout regulation down to VIN = VOUT - critical for single-cell Li-ion or coin-cell applications |
| Integrated soft-start | 1ms internal ramp - eliminates inrush current and output overshoot during power-up |
| Overtemperature protection | Thermal shutdown at TJ ≈ 150°C - protects against sustained overload or poor heatsinking |
| Internal compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity |
Applications
| Battery-Powered Equipment | Portable Instrumentation |
|---|---|
Use Scenario: Long-life operation from primary lithium or alkaline cells in handheld test meters and data loggers. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator with ultralow IQ to maximize runtime between battery replacements. Use Value: 3.5µA shutdown current and 100% duty-cycle support extend usable battery voltage range down to 3.3V, delaying end-of-life detection. | Use Scenario: Power management in compact medical sensors and field-deployable environmental monitors. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying clean 3.3V to precision ADCs, microcontrollers, and RF transceivers. Use Value: ±1% output accuracy and ±7.5% PGOOD window ensure reliable digital logic sequencing and analog reference stability. |
| Emergency Radios | General Purpose Step-Down Supplies |
Use Scenario: Critical backup communication devices powered by NiMH or supercapacitors with variable input voltage. IC Role / Device Role / Timing Role: High-efficiency 3.3V regulator maintaining operation across wide VIN (2.7V–17V) and load transients. Use Value: Burst Mode efficiency >85% at 1mA load and forced continuous mode enable stable RF PA bias under dynamic transmit conditions. | Use Scenario: Industrial control modules requiring robust, drop-in 3.3V conversion from 5V, 12V, or 24V rails. IC Role / Device Role / Timing Role: Monolithic synchronous buck replacing discrete solutions with integrated MOSFETs and gate drivers. Use Value: 2A output current, 95% peak efficiency, and MSOP thermal performance simplify thermal design versus DFN alternatives. |
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 | 2.7V–6V input, 3.3V fixed, 1.8µA IQ - narrower VIN range, lower max current (1A) | Suitable only for low-VIN battery systems (e.g., single Li-ion); not viable for 12V/17V inputs | Select if ultra-low IQ (<2µA) and small size are prioritized over input range and current capability. |
| MAX17503GEE+T | 4.5V–60V input, adjustable VOUT, 100µA IQ - higher IQ, wider VIN, external FETs required | Designed for high-VIN industrial supplies; lacks integrated MOSFETs and fixed 3.3V option | Choose when input exceeds 17V or when programmable output and higher power are needed. |
Compared with TPS62840DLCR and MAX17503GEE+T, the LTC3624EMSE-3.3#PBF uniquely balances 17V max input, 2A output, 3.5µA IQ, and fixed 3.3V in a thermally enhanced MSOP - making it optimal for mid-range portable equipment where VIN spans 3V–17V and reliability under thermal stress matters.
Availability
LTC3624EMSE-3.3#PBF is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and emergency radios requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3624EMSE-3.3#PBF 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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3624 series was designed specifically for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained, battery-sensitive applications - emphasizing seamless transition between operating modes and robust thermal performance in MSOP packaging.
FAQ
What is the guaranteed output voltage tolerance for LTC3624EMSE-3.3#PBF across temperature?
The LTC3624EMSE-3.3#PBF delivers a fixed 3.3V output with ±1% accuracy over the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table (VOUT parameter for LTC3624-3.3 variants). This tolerance includes initial calibration, line/load regulation, and temperature drift - confirmed by production testing and design correlation.
Does LTC3624EMSE-3.3#PBF require an external feedback resistor divider?
No, the LTC3624EMSE-3.3#PBF does not require an external feedback resistor divider. As a factory-trimmed fixed-output variant, its FB pin is internally connected to the output, eliminating external components and ensuring consistent 3.3V regulation without layout sensitivity or resistor tolerance errors.
What thermal derating applies to LTC3624EMSE-3.3#PBF in its MSOP package?
The LTC3624EMSE-3.3#PBF in the 12-lead MSOP package has θJA = 40°C/W. At TA = 85°C and 2A load, power dissipation (≈0.4W) raises junction temperature to ~165°C - exceeding the 125°C rating. Derating to ≤1.3A at 85°C ambient ensures TJ ≤125°C. The exposed pad (Pin 13) must be soldered to a thermal pad for rated performance.
How does the MODE/SYNC pin configure operation modes on LTC3624EMSE-3.3#PBF?
The MODE/SYNC pin on LTC3624EMSE-3.3#PBF selects operating mode: tie to INTVCC for Burst Mode (3.5µA IQ, 800mA clamp), ground for pulse-skipping (low ripple), or apply 1V–2.4V for forced continuous mode. It also accepts external clocks from 0.6MHz to 1.4MHz for synchronization - all without external components.
Is LTC3624EMSE-3.3#PBF RoHS-compliant and lead-free?
Yes, LTC3624EMSE-3.3#PBF carries the #PBF suffix indicating lead-free finish and full RoHS compliance. It uses matte tin plating over copper leads and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH.
LTC3624EMSE-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3624EMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EMSE-3.3#PBF 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#PBF reliable?
The price and inventory of LTC3624EMSE-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EMSE-3.3#PBF?
LTC3624EMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EMSE-3.3#PBF 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#PBF?
For technical support, including LTC3624EMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EMSE-3.3#PBF requirements.
6.How does Aetrix verify that LTC3624EMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EMSE-3.3#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EMSE-3.3#PBF?
All LTC3624EMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EMSE-3.3#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3624EMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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