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Analog Devices Inc. LTC3624EMSE#PBF
- Part No.:
- LTC3624EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:746
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Product details
Overview
LTC3624EMSE#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC regulator in a 12-lead MSOP package, featuring 2.25MHz fixed switching frequency, 3.5µA quiescent current in shutdown, ±1% output voltage accuracy, and adjustable 0.6V–VIN output range. It delivers high efficiency in battery-powered portable instrumentation and emergency radios.
For engineers reviewing the LTC3624EMSE#PBF datasheet, LTC3624EMSE#PBF pinout, LTC3624EMSE#PBF application, or LTC3624EMSE#PBF equivalent, key selection criteria include ultralow IQ operation, 2.25MHz sync capability, Burst Mode® vs pulse-skipping trade-offs, thermal performance in MSOP, and compatibility with ceramic input/output capacitors.
Technical Context
The LTC3624EMSE#PBF uses a constant-frequency peak current mode architecture with internal compensation and soft-start. It supports three operating modes-Burst Mode® (3.5µA IQ), pulse-skipping (low ripple), and forced continuous (stable frequency)-selected via the MODE/SYNC pin.
It integrates PMOS/NMOS synchronous switches with 200mΩ/115mΩ RDS(ON), provides overtemperature protection, VIN overvoltage lockout (19V), and PGOOD with ±7.5% window and 32-cycle blanking delay. The device maintains regulation down to 100% duty cycle with ultralow IQ dropout behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery-supplied systems including 12V rails and Li-ion stacks. |
| Output Voltage Range | 0.6V to VIN - enables flexible point-of-load regulation for core, I/O, and analog supplies. |
| Switching Frequency | 2.25MHz ±40% sync range - allows compact filter design with small inductors/ceramic caps and EMI spread-spectrum compatibility. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on portable devices like emergency radios and handheld meters. |
| Output Accuracy | ±1% over temperature - ensures stable reference for precision analog circuitry and ADC/DAC biasing. |
| Max Output Current | 2A continuous - powers microcontrollers, sensors, RF modules, and display drivers without external boost stages. |
| Thermal Rating | –40°C to 125°C junction - qualified for industrial and automotive under-hood auxiliary power applications. |
Pinout & Package
Package: 12-Lead Plastic MSOP (3mm × 4.4mm) with exposed pad (Pin 13 = GND). Requires soldered exposed pad for thermal and electrical performance.
| 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 and voltage spikes. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7–17V; powers internal LDO (INTVCC) and high-side switch - bypass with ≥10µF ceramic close to pins. |
| RUN (Pin 5) | Enable control | Active-high logic input; pulls low to disable regulator and reduce system standby power to <0.1µA. |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking to reject transient glitches. |
| FB (Pin 8) | Feedback input | Senses resistor divider output; sets VOUT = 0.6V × (1 + R2/R1); 10nA input bias enables high-impedance dividers. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥2.2µF ceramic to GND for stability. |
| MODE/SYNC (Pin 10) | Mode select & clock sync | Tie to INTVCC for Burst Mode®, GND for pulse-skipping, or external clock (2.05–2.45MHz) for forced continuous sync. |
| GND (Pins 11,12,13) | Signal & power ground | Exposed pad (Pin 13) must be soldered to PCB ground plane for θJA = 40°C/W and reliable thermal dissipation. |
| NC (Pin 7) | No connect | Internally unconnected; leave floating or tie to GND - no electrical function or routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for multi-day battery life in portable instrumentation. |
| 2.25MHz Fixed Frequency | Enables use of sub-2.2µH inductors and 10–22µF ceramic output caps - shrinks solution size by >40% vs 500kHz alternatives. |
| 100% Duty Cycle Dropout | Maintains regulation as VIN approaches VOUT - supports brownout resilience in 3.3V/5V systems powered from depleting batteries. |
| Integrated Soft-Start | 1ms internal ramp prevents inrush current and output overshoot - eliminates need for external timing components. |
| Overvoltage Lockout | Shuts down at VIN >19V and resumes at 18.5V - protects internal MOSFETs from transient surges on 12V/15V supply lines. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters, gas detectors, and field calibrators operating from single-cell Li-ion or AA/AAA batteries. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.6V–12V battery input to stable 3.3V or 1.8V for MCU, sensor, and display subsystems. Use Value: 3.5µA shutdown IQ and Burst Mode® extend runtime beyond 100 hours on 2000mAh cells; 2.25MHz operation minimizes solution footprint for compact enclosures. | Use Scenario: Self-contained emergency communication radios requiring long shelf life and instant-on capability after storage. IC Role / Device Role / Timing Role: Main power converter delivering regulated 3.3V from alkaline or NiMH battery packs (6–9V), supporting RF transceiver and audio amplifier stages. Use Value: Ultralow IQ preserves battery capacity during years of standby; 100% duty cycle operation ensures full functionality even as battery voltage drops to 3.6V. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: Board-level point-of-load conversion in programmable logic controllers, data acquisition modules, and industrial HMIs. IC Role / Device Role / Timing Role: Secondary regulator generating clean 5V or adjustable rail from 12V/24V backplane, powering isolated interfaces and analog front-ends. Use Value: ±1% output accuracy and low load/line regulation (<0.1%) ensure stable ADC references and DAC outputs; robust thermal rating supports convection-cooled enclosures. | Use Scenario: Wireless sensor nodes deployed in remote locations with limited maintenance access and variable ambient temperatures. IC Role / Device Role / Timing Role: Power management IC supplying 1.2V/3.3V to ultra-low-power MCU, BLE radio, and MEMS sensors from primary lithium-thionyl chloride cells. Use Value: –40°C to 125°C operation ensures reliability across desert/arctic deployments; low EMI 2.25MHz switching avoids interference with narrowband RF bands. |
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, 0.6–5.5V output, 1.8µA IQ, 2.25MHz, 1A max - lower current rating and narrower VIN range. | Optimized for single-cell Li-ion systems only; not suitable for 12V input or 2A loads. | Select when board space and IQ are paramount and load ≤1A; verify thermal margin at full load in MSOP. |
| MP2451DT-LF-Z | 4.5–28V input, 0.8–15V output, 2.2MHz, 0.6A max, 26µA IQ - higher IQ, lower current, wider VIN but no Burst Mode®. | Targeted at cost-sensitive industrial supplies where 2A is not required and 3.5µA IQ is unnecessary. | Choose for 24V input legacy designs needing simple drop-in replacement; avoid for battery longevity-critical apps. |
Compared with TPS62840DLCR and MP2451DT-LF-Z, the LTC3624EMSE#PBF uniquely combines 2A capability, 2.25MHz sync, 3.5µA IQ, and 17V max input in a thermally enhanced MSOP - making it optimal for compact, high-efficiency, wide-input battery and industrial supplies.
Availability
LTC3624EMSE#PBF is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, emergency radios, and industrial sensor nodes requiring stable component supply with long-term lifecycle support.
Supply support for LTC3624EMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3624EMSE#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for space-constrained, battery-sensitive applications demanding ultralow quiescent current and high-frequency operation.
FAQ
What is the maximum input voltage rating for the LTC3624EMSE#PBF?
The LTC3624EMSE#PBF has an absolute maximum input voltage rating of 17V. Its overvoltage lockout activates at 19V (with 500mV hysteresis), suspending operation to protect internal MOSFETs. Continuous operation above 17V risks permanent damage, so system design must ensure VIN never exceeds this limit under transient or fault conditions. The LTC3624EMSE#PBF is rated for 2.7V–17V normal operation.
How does the MODE/SYNC pin configure operating modes on the LTC3624EMSE#PBF?
The MODE/SYNC pin on the LTC3624EMSE#PBF selects between three distinct modes: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply 1V–VINTVCC–1.2V for forced continuous mode. When driven by an external clock (2.05–2.45MHz), it synchronizes switching and forces continuous operation. This pin directly controls efficiency–ripple trade-offs without external logic, making the LTC3624EMSE#PBF adaptable across diverse load profiles.
Does the LTC3624EMSE#PBF support 100% duty cycle operation, and what is its significance?
Yes, the LTC3624EMSE#PBF supports true 100% duty cycle operation, enabling regulation as VIN drops to within ~100mV of VOUT. This is critical for battery-powered systems where input voltage decays over time - such as alkaline or Li-ion cells - ensuring uninterrupted power delivery until full depletion. In dropout, the top PMOS remains fully on, and quiescent current stays ultralow in Burst Mode®, extending usable battery life beyond conventional buck regulators.
What thermal considerations apply to the LTC3624EMSE#PBF in its 12-lead MSOP package?
The LTC3624EMSE#PBF in the 12-lead MSOP package has θJA = 40°C/W and θJC = 10°C/W, contingent on proper soldering of the exposed pad (Pin 13) to a PCB ground plane. Without thermal pad connection, junction temperature rise can exceed safe limits at 2A load. For continuous 2A operation at 125°C ambient, ≥2cm² copper area under the pad is recommended. Derating curves show 1.8A max at 85°C ambient with minimal copper; the LTC3624EMSE#PBF's thermal design must prioritize pad soldering and layout.
Can the LTC3624EMSE#PBF be used with ceramic input and output capacitors, and what precautions apply?
Yes, the LTC3624EMSE#PBF is optimized for ceramic capacitors: use ≥10µF X5R/X7R ceramic at VIN and ≥22µF at VOUT. However, due to ultralow ESR, input ringing may occur with long cables or wall adapters - add a small series RC snubber (e.g., 1Ω + 100nF) if VIN exhibits >100mV overshoot. Output capacitor selection must meet both ripple (<20mV) and load-step droop requirements; the LTC3624EMSE#PBF's internal compensation assumes typical ceramic ESR <10mΩ.
LTC3624EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624EMSE#PBF FAQ
1.How can I place an order for LTC3624EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624EMSE#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#PBF reliable?
The price and inventory of LTC3624EMSE#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624EMSE#PBF?
LTC3624EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624EMSE#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#PBF?
For technical support, including LTC3624EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624EMSE#PBF requirements.
6.How does Aetrix verify that LTC3624EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624EMSE#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624EMSE#PBF?
All LTC3624EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624EMSE#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#PBF part is unused and in its original packaging.
Return procedure for LTC3624EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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