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Analog Devices Inc. LTC3624IMSE#PBF
- Part No.:
- LTC3624IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,820
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Product details
Overview
LTC3624IMSE#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in a 12-lead MSOP package, featuring 2.25MHz fixed switching frequency, 3.5µA quiescent current in Burst Mode, and adjustable 0.6V to VIN output voltage. It delivers high efficiency across wide input (2.7V–17V) and load ranges, targeting battery-powered portable instrumentation and emergency radios.
For engineers reviewing the LTC3624IMSE#PBF datasheet, LTC3624IMSE#PBF pinout, LTC3624IMSE#PBF application, or LTC3624IMSE#PBF equivalent, key selection criteria include ultralow IQ operation, 2.25MHz sync capability, ±1% VFB accuracy, dropout support up to 100% duty cycle, and thermal performance with exposed pad grounding.
Technical Context
The LTC3624IMSE#PBF employs constant-frequency peak current mode control with internal compensation and soft-start. Its 2.25MHz oscillator supports ±40% external synchronization via the MODE/SYNC pin, enabling EMI reduction and multi-rail timing coordination.
It integrates PMOS/NMOS power switches with 200mΩ/115mΩ RDS(ON), operates down to 2.7V input, sustains 100% duty cycle in dropout, and features overtemperature protection with guaranteed –40°C to 125°C junction operation.
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 Voltage Range | 0.6V to VIN - enables direct regulation from 3.3V, 5V, or 12V inputs to sub-1V logic supplies. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows compact 2.2µH inductors and reduces EMI fundamental below 30MHz. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on sensor nodes with microamp sleep current. |
| Output Accuracy | ±1% over temperature - ensures stable reference for ADCs, precision analog circuits, and low-voltage microcontrollers. |
| Max Output Current | 2A continuous - powers dual-core MCUs, RF transceivers, or display backlights from a single buck stage. |
| Thermal Rating | –40°C to 125°C operating junction - qualified for automotive cabin, industrial control, and outdoor portable equipment. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.1mm) with exposed thermal pad (Pin 13), requiring solder connection to PCB ground for rated θJA = 40°C/W and thermal reliability.
| 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 Kelvin return path to minimize EMI. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic close to pins. |
| RUN (Pin 5) | Enable control | Logic-high (>0.35V) enables regulation; pulled low disables all switching and reduces IQ to 0.1µA shutdown. |
| 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 resistor divider output; regulates VOUT = 0.6V × (1 + R2/R1); 10nA bias current 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) | Operating mode select | Tied to INTVCC → Burst Mode (low IQ); grounded → pulse-skipping (low ripple); 1V–2.4V → forced continuous (no subharmonics). |
| GND (Pins 11,12,13) | Signal & power ground | Exposed pad (Pin 13) must be soldered to solid PCB ground plane - critical for thermal dissipation and noise immunity. |
| NC (Pin 7) | No connect | Internally unconnected - leave floating or tie to GND per layout best practice; no electrical function. |
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 smoke detectors. |
| 2.25MHz fixed frequency | Enables use of small 2.2µH inductors and 4.7µF–10µF ceramic output caps - cuts solution size by >40% vs 500kHz alternatives. |
| 100% duty cycle dropout | Maintains regulation as VIN approaches VOUT - supports brownout resilience in battery systems discharging from 4.2V to 3.0V. |
| Internal soft-start | 1ms monotonic ramp prevents inrush current and output overshoot - eliminates need for external soft-start circuitry. |
| Overtemperature protection | Thermal shutdown activates above 150°C junction - protects against sustained overload or poor heatsinking without external sensors. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes operating from two AA alkaline cells (1.8V–3.2V) or single Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V/5V system supply regulating from variable battery voltage with minimal load-current variation. Use Value: 3.5µA quiescent current extends shelf life beyond 10 years; 100% duty cycle maintains output during battery depletion. | Use Scenario: Self-contained emergency AM/FM radios with integrated LED flashlight, powered by 3×AAA batteries (3.6V–4.5V). IC Role / Device Role / Timing Role: Single-stage buck converter delivering stable 3.3V to MCU, audio amplifier, and RF front-end under pulsed transmit loads. Use Value: 2.25MHz operation avoids AM band interference; PGOOD enables battery-low warning before shutdown. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: DIN-rail mounted PLC I/O modules requiring isolated 5V/3.3V rails from 24V DC field supply. IC Role / Device Role / Timing Role: Non-isolated intermediate regulator stepping 24V down to 5V for digital logic and communication interfaces. Use Value: 17V absolute max rating tolerates 24V transients; ±1% VFB ensures accurate ADC reference generation. | Use Scenario: Wireless vibration sensors in predictive maintenance systems, deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Power management IC supplying 1.8V core voltage to ultra-low-power MCU and MEMS accelerometer. Use Value: –40°C to 125°C guaranteed operation ensures reliability in uncontrolled enclosures; SYNC pin enables time-synchronized sampling across multiple nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864DRLR | 2.5V–5.5V input, 1.8V–5.5V output, 2A, 4MHz, 1.2µA IQ - narrower VIN range, higher fSW, lower IQ but no 17V rating. | Best suited for USB-powered or single-LiPo systems; not viable for 12V/24V industrial inputs. | Select TPS62864DRLR only when input is strictly ≤5.5V and board space demands highest possible frequency. |
| MP2451DT-LF-Z | 4.5V–36V input, 0.8V–28V output, 0.6A, 2MHz, 260µA IQ - wider VIN, lower current, higher IQ, no sync or Burst Mode. | Applicable for higher-input industrial supplies but lacks ultralow-IQ sleep and precise VFB accuracy. | Choose MP2451DT-LF-Z only for cost-sensitive 0.6A applications where 3.5µA IQ is unnecessary and 2A capability is unused. |
Compared with TPS62864DRLR and MP2451DT-LF-Z, the LTC3624IMSE#PBF uniquely combines 17V input tolerance, 2A output, 2.25MHz sync capability, and 3.5µA Burst Mode IQ - making it the only option qualified for wide-VIN portable equipment requiring both long battery life and robust transient handling.
Availability
LTC3624IMSE#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and full temperature-grade traceability.
Supply support for LTC3624IMSE#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 high-performance power management portfolio with rigorous qualification standards.
The LTC3624IMSE#PBF belongs to the LTC® monolithic synchronous buck regulator family, designed specifically for space-constrained, battery-sensitive applications demanding ultralow quiescent current and wide input voltage flexibility.
FAQ
What is the guaranteed operating temperature range for the LTC3624IMSE#PBF?
The LTC3624IMSE#PBF is guaranteed to operate over a junction temperature range of –40°C to 125°C. This "I-grade" rating is production-tested and documented in the official datasheet's Order Information table. The device uses an exposed-pad MSOP package with θJA = 40°C/W, and proper PCB thermal design is required to maintain this rating under full 2A load conditions. The LTC3624IMSE#PBF does not share the H-grade (–40°C to 150°C) specification of the HMSE variant.
How does the MODE/SYNC pin configure operating modes on the LTC3624IMSE#PBF?
The MODE/SYNC pin on the LTC3624IMSE#PBF selects among three distinct operating modes: tying it to INTVCC enables Burst Mode® (3.5µA IQ, 800mA peak clamp); grounding it selects pulse-skipping mode (lowest output ripple); applying 1.0V–2.4V sets forced continuous conduction (no subharmonic artifacts). It also accepts external clocks within ±40% of 2.25MHz to synchronize switching. All configurations are implemented without external components, and the LTC3624IMSE#PBF's internal logic interprets voltage thresholds directly per the Electrical Characteristics table.
Does the LTC3624IMSE#PBF support 100% duty cycle operation, and what is its significance?
Yes, the LTC3624IMSE#PBF supports true 100% duty cycle operation, allowing VOUT to remain regulated even when VIN drops to within ~100mV of the output voltage. This dropout capability is enabled by the integrated PMOS high-side switch and internal slope compensation that maintains current-mode stability at high duty cycles. For battery-powered systems using the LTC3624IMSE#PBF, this feature maximizes usable energy - for example, sustaining a 3.3V rail down to a 3.4V Li-ion cell voltage, extending runtime significantly compared to regulators requiring minimum VIN–VOUT headroom.
What is the purpose and behavior of the PGOOD pin on the LTC3624IMSE#PBF?
The PGOOD pin on the LTC3624IMSE#PBF is an open-drain output that asserts high when the regulated output voltage remains within ±7.5% of its target value. It incorporates a 32-cycle blanking delay on the falling edge to suppress false triggers during load transients. When VOUT falls outside regulation, the internal 280Ω pull-down activates; when regulation is restored, PGOOD rises immediately. This signal is used for system power sequencing, fault detection, and battery-low warnings - and the LTC3624IMSE#PBF's PGOOD timing and threshold are fully specified across temperature and load conditions.
Can the LTC3624IMSE#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3624IMSE#PBF can be synchronized to an external clock applied to the MODE/SYNC pin. Its sync range is ±40% of its nominal 2.25MHz frequency - i.e., 1.35MHz to 3.15MHz - as confirmed in the Electrical Characteristics table under fSYNC. Synchronization engages within 2–3 external clock cycles and releases within ~2µs of clock loss. This capability allows EMI reduction through frequency dithering or alignment with system clocks, and the LTC3624IMSE#PBF maintains forced continuous mode during sync, ensuring predictable ripple and loop response.
LTC3624IMSE#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
LTC3624IMSE#PBF FAQ
1.How can I place an order for LTC3624IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IMSE#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 LTC3624IMSE#PBF reliable?
The price and inventory of LTC3624IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IMSE#PBF?
LTC3624IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IMSE#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 LTC3624IMSE#PBF?
For technical support, including LTC3624IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IMSE#PBF requirements.
6.How does Aetrix verify that LTC3624IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IMSE#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 LTC3624IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IMSE#PBF?
All LTC3624IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IMSE#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 LTC3624IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3624IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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