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Analog Devices Inc. LTC3624HMSE#PBF
- Part No.:
- LTC3624HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LTC3624HMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 17V input, 2A synchronous step-down regulator in a 12-lead MSOP package with exposed thermal pad. It features 2.25MHz fixed switching frequency, 3.5µA quiescent current in Burst Mode, ±1% output voltage accuracy, and adjustable output from 0.6V to VIN - optimized for battery-powered portable instrumentation requiring ultra-low standby power and compact layout.
For engineers reviewing the LTC3624HMSE#PBF datasheet, LTC3624HMSE#PBF pinout, LTC3624HMSE#PBF application, or LTC3624HMSE#PBF equivalent, key selection criteria include its H-grade 150°C junction rating, MODE/SYNC-configurable operation modes (Burst/Pulse-Skipping/Forced Continuous), internal compensation, and compatibility with ceramic input/output capacitors in space-constrained designs.
Technical Context
The LTC3624HMSE#PBF implements a constant-frequency peak current mode control architecture with internal slope compensation, enabling stable regulation across wide input (2.7V–17V) and output (0.6V–VIN) ranges. Its 2.25MHz oscillator supports ±40% external synchronization via the MODE/SYNC pin, and it maintains 100% duty cycle low-dropout operation with ultralow IQ.
It integrates dual MOSFETs (PMOS high-side, NMOS low-side), an error amplifier with 0.6V reference, overtemperature protection, and a 1ms internal soft-start. The H-grade temperature rating (–40°C to 150°C) ensures reliability in thermally demanding environments without derating at elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion up to 16V industrial rails without external pre-regulation. |
| Output Current | Up to 2A continuous - delivers full rated load with thermal management via exposed pad soldering. |
| Switching Frequency | 2.25MHz (±40% sync range) - enables use of sub-3mm inductors and reduces output capacitor size. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on sensor nodes and emergency radios. |
| Feedback Reference | 0.6V ±1% - sets precise output voltage via external resistor divider; fixed-VOUT variants omit FB divider. |
| Junction Temp Range | –40°C to +150°C - H-grade qualification allows operation in under-hood, industrial, or high-power-density enclosures. |
| Peak Current Limit | 2.3A (H-grade) - provides robust short-circuit protection while maintaining startup into heavy loads. |
| PGOOD Accuracy | ±7.5% window - asserts valid power status only when VOUT is within tight regulation band, critical for system sequencing. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed thermal pad (Pin 13 = GND), footprint-compatible with industry-standard MSOP-12 but requiring exposed pad soldering 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 loop layout and Kelvin connection for stability. |
| VIN (Pin 3, 4) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch - bypass with ≥10µF ceramic close to pin. |
| RUN (Pin 5) | Enable control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float. |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output asserting high when VOUT is within ±7.5%; includes 32-cycle blanking to reject transient glitches. |
| FB (Pin 8) | Feedback input | Senses divided output voltage; regulates to 0.6V reference - connect directly to VOUT for fixed-output versions. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic to GND for noise immunity. |
| MODE/SYNC (Pin 10) | Operation mode & sync input | Selects Burst Mode (tie to INTVCC), Pulse-Skipping (tie to GND), Forced Continuous (1V–VINTVCC–1.2V), or external clock sync. |
| GND (Pins 11, 12, Exposed Pad 13) | Signal & power ground | All grounds tied internally; exposed pad must be soldered to PCB thermal plane for θJC = 10°C/W and reliable 150°C operation. |
| NC (Pin 7) | No connect | Unbonded terminal - no internal connection; leave unconnected or tie to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - ideal for intermittent-sensing applications like portable gas detectors. |
| 100% duty cycle dropout | Enables regulation down to VOUT ≈ VIN with ultralow IQ - supports brownout recovery and battery end-of-life operation. |
| Internal compensation | Eliminates external compensation network - simplifies design, reduces BOM count, and ensures stability across all operating conditions. |
| Overtemperature protection | Thermal shutdown activates above TJ = 150°C - protects device during sustained overload or poor heatsinking without external circuitry. |
| Programmable PGOOD threshold | ±7.5% window (adjustable via external resistors on some variants) - enables precise power sequencing in multi-rail systems. |
| Low minimum on-time (60ns) | Supports high VIN/VOUT ratios at 2.25MHz - enables 12V-to-3.3V conversion without violating timing constraints. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and field-deployable environmental sensors powered by 2-cell Li-ion (6V–8.4V). IC Role / Device Role / Timing Role: Primary DC/DC converter regulating 3.3V or 5V system rail from variable battery input. Use Value: 3.5µA quiescent current extends shelf life and runtime between charges; 2.25MHz switching minimizes inductor size for handheld ergonomics. | Use Scenario: Self-contained emergency communication devices with backup battery, requiring instant wake-up and long standby. IC Role / Device Role / Timing Role: Always-on power manager delivering regulated 3.3V to MCU and RF transceiver during standby and transmit bursts. Use Value: Burst Mode maintains µA-level sleep current while enabling sub-100µs wake-up to full 2A output - critical for rapid emergency activation. |
| Industrial Sensor Nodes | Low-Power IoT Edge Devices |
Use Scenario: Wireless vibration or temperature sensors mounted on motors or pipelines, powered by primary lithium thionyl chloride cells. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping 3.6V nominal battery to 1.8V or 3.3V for microcontroller and analog front-end. Use Value: 95% peak efficiency at 100mA and 3.5µA IQ maximize usable energy from non-rechargeable cells; H-grade rating ensures operation at 85°C ambient. | Use Scenario: Cellular-connected asset trackers using NB-IoT or LTE-M, cycling between deep sleep and brief data transmission bursts. IC Role / Device Role / Timing Role: System power controller managing VDD for SoC, modem, and GPS module with dynamic load response. Use Value: Pulse-skipping mode minimizes output ripple during active transmission (reducing EMI), while forced continuous mode ensures clean power during RF calibration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 2.4V–6V input, 1.8V–5.5V output, 1A max, 0.36µA IQ - lower current, narrower VIN, superior ultra-low-IQ but no H-grade temp rating. | Best for coin-cell or single-LiFePO₄ systems where <1A load and <6V input dominate; unsuitable for 12V industrial rails. | Select TPS62840DLCR only when input never exceeds 6V and peak load ≤1A - avoids overdesign and cost premium of 2A capability. |
| MP2451DT-LF-Z | 4.5V–28V input, 0.8V–15V output, 2A, 2.2MHz, 35µA IQ - wider VIN, higher IQ, no Burst Mode, no H-grade, no integrated soft-start. | Suitable for 24V industrial buses or automotive 12V systems with less stringent standby requirements; lacks precision PGOOD and thermal grade. | Choose MP2451DT-LF-Z for cost-sensitive 24V applications where 35µA IQ is acceptable and extended temperature qualification is unnecessary. |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the LTC3624HMSE#PBF uniquely combines 2A capability, 2.25MHz switching, 3.5µA IQ, ±1% accuracy, and H-grade 150°C operation - making it the only option qualified for high-reliability, wide-input, thermally constrained portable instrumentation.
Availability
LTC3624HMSE#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and industrial sensor nodes requiring stable component supply, guaranteed long-term availability, and traceable sourcing for medical and defense-qualified programs.
Supply support for LTC3624HMSE#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 its legacy of high-performance power management ICs with rigorous characterization and application support.
The LTC3624 product line was designed for ultra-low-power, high-efficiency DC/DC conversion in portable, battery-critical, and thermally demanding applications - emphasizing quiescent current optimization, wide input flexibility, and robust thermal performance.
FAQ
What is the maximum junction temperature specification for the LTC3624HMSE#PBF?
The LTC3624HMSE#PBF is specified for operation from –40°C to +150°C junction temperature. This H-grade rating is validated per Linear Technology/Analog Devices characterization and process controls, enabling deployment in high-ambient environments such as enclosed industrial enclosures or under-hood automotive auxiliary systems where standard I-grade (–40°C to 125°C) parts would require derating.
How does the MODE/SYNC pin configure operation modes on the LTC3624HMSE#PBF?
The MODE/SYNC pin on the LTC3624HMSE#PBF selects among three operating modes: tie to INTVCC for Burst Mode (3.5µA IQ), tie to GND for Pulse-Skipping (low ripple), or bias between 1V and VINTVCC–1.2V for Forced Continuous (stable frequency). It also accepts external clocks for synchronization across multiple regulators - all configurations are implemented without external components.
Does the LTC3624HMSE#PBF require external compensation components?
No, the LTC3624HMSE#PBF features fully internal compensation. Its current-mode architecture with built-in slope compensation eliminates the need for external RC networks on the COMP or ITH pins - reducing design complexity, PCB area, and BOM count while guaranteeing stability across the full input/output/load range.
What is the purpose of the exposed thermal pad on the LTC3624HMSE#PBF MSOP package?
The exposed thermal pad (Pin 13) on the LTC3624HMSE#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJC = 10°C/W and ensure reliable operation at full 2A load and 150°C junction temperature - omitting this connection risks thermal shutdown or accelerated parametric drift.
Can the LTC3624HMSE#PBF regulate output voltage below 0.6V?
No, the LTC3624HMSE#PBF has a fixed 0.6V internal feedback reference voltage. The minimum regulated output is 0.6V (when R1 = 0Ω in the FB divider), and the maximum is VIN. Output voltages below 0.6V cannot be achieved - alternative solutions such as post-regulation LDOs or different controller topologies would be required.
LTC3624HMSE#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624HMSE#PBF FAQ
1.How can I place an order for LTC3624HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624HMSE#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 LTC3624HMSE#PBF reliable?
The price and inventory of LTC3624HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624HMSE#PBF?
LTC3624HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624HMSE#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 LTC3624HMSE#PBF?
For technical support, including LTC3624HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624HMSE#PBF requirements.
6.How does Aetrix verify that LTC3624HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624HMSE#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 LTC3624HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624HMSE#PBF?
All LTC3624HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624HMSE#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 LTC3624HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3624HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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