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Analog Devices Inc. LTC3624IMSE-3.3#PBF
- Part No.:
- LTC3624IMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624IMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LTC3624IMSE-3.3#PBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in a 12-lead MSOP package with fixed 3.3V output, 1MHz switching frequency, ±1% output voltage accuracy, and 3.5µA quiescent current in shutdown - designed for battery-powered instrumentation requiring ultra-low power consumption and stable low-noise supply.
For engineers reviewing the LTC3624IMSE-3.3#PBF datasheet, LTC3624IMSE-3.3#PBF pinout, LTC3624IMSE-3.3#PBF application, or LTC3624IMSE-3.3#PBF equivalent, this page delivers verified electrical parameters, thermal performance data, mode-selectable operation (Burst/Pulse-Skipping/Forced Continuous), PGOOD monitoring, and real-world efficiency vs. load curves at 3.3V output.
Technical Context
The LTC3624IMSE-3.3#PBF employs constant-frequency peak current mode control with internal compensation and 1ms soft-start. It operates across 2.7V–17V input while delivering up to 2A at fixed 3.3V with ±1% accuracy over –40°C to 125°C junction temperature.
Its MODE/SYNC pin supports three operating modes: Burst Mode (3.5µA IQ, 800mA clamp), pulse-skipping (low ripple), or forced continuous (stable frequency); it also enables external clock synchronization within ±40% of 1MHz. Integrated overtemperature protection and VIN overvoltage lockout (19V trip) ensure robust system-level reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (guaranteed over –40°C to 125°C; no external feedback divider required) |
| Input Voltage Range | 2.7V to 17V (supports wide-input industrial/battery systems; UVLO at 2.7V) |
| Switching Frequency | 1MHz ±8% (E/I-grade; enables compact 2.2µH inductor and <100ns minimum on-time compliance) |
| Quiescent Current | 3.5µA in shutdown; 1.8mA typical in forced continuous mode (enables multi-year battery life in sleep-state devices) |
| Peak Output Current | 2.4A minimum (I-grade; sustains 2A continuous output with margin under worst-case thermal conditions) |
| Efficiency | 95% max at 1A/12VIN/3.3VOUT (Burst Mode); >85% at 10mA load (critical for intermittent-sensing applications) |
| Thermal Performance | θJA = 40°C/W, TJMAX = 125°C (exposed pad must be soldered to PCB ground for rated performance) |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.02mm) with exposed thermal pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node | Connects to inductor; carries high di/dt square-wave current - requires tight layout and Kelvin return path |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7V–17V; bypass with ≥10µF ceramic capacitor placed adjacent to pins |
| RUN (Pin 5) | Enable control | Active-high logic input; pull low to disable regulator and reduce IQ to 0.1µA |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output with 280Ω pull-down; asserts high when VOUT is within ±7.5% of 3.3V (250ms delay on fault detection) |
| FB (Pin 8) | Feedback reference | Internally tied to 3.3V output (fixed version); no external resistor divider needed |
| INTVCC (Pin 9) | Bias LDO output | 3.6V regulated supply for gate drivers; bypass 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 1V–2.4V for forced continuous |
| GND (Pins 11,12,13) | Signal & power ground | Exposes thermal pad (Pin 13) - must be soldered to large PCB copper area for θJA = 40°C/W |
| NC (Pin 7) | No connect | Unused terminal; no internal connection - leave unconnected or tie to GND for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow shutdown IQ | 0.1µA (enables zero-power storage mode in portable emergency radios and remote sensors) |
| 100% duty cycle dropout operation | Maintains regulation down to VIN = VOUT (3.3V) with ultralow IQ - critical for single-cell Li-ion or alkaline battery end-of-life support) |
| Integrated soft-start | 1ms internal ramp (prevents inrush current during cold start; eliminates need for external timing components) |
| Robust protection suite | Includes overtemperature shutdown, VIN overvoltage lockout (19V), and reverse-current blocking - reduces need for external protection circuitry |
| Mode-selectable light-load behavior | Three user-configurable modes (Burst/Pulse-Skipping/Forced Continuous) allow precise trade-off between efficiency, ripple, and EMI in final system design |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
|
Use Scenario: Portable multimeter or handheld gas detector operating from two AA alkaline cells (1.8V–3.2V) with intermittent 100ms sensor-read cycles. IC Role / Device Role / Timing Role: Primary 3.3V system supply regulating down from declining battery voltage; provides clean, stable rail for MCU, ADC, and RF transceiver. Use Value: 3.5µA shutdown IQ extends shelf life beyond 5 years; 100% duty cycle operation sustains 3.3V output until battery drops below 3.3V. |
Use Scenario: Hand-crank or solar-charged emergency AM/FM radio with LED display and audio amplifier. IC Role / Device Role / Timing Role: Main 3.3V supply for microcontroller, display driver, and low-noise audio codec - must operate through wide input range (2.7V–17V). Use Value: 95% peak efficiency minimizes heat in sealed enclosure; PGOOD signal enables automatic low-battery warning before brownout. |
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|
Use Scenario: Wearable ECG patch transmitting biometric data via BLE every 5 seconds, powered by coin cell. IC Role / Device Role / Timing Role: Ultra-low-IQ 3.3V regulator enabling 3-year battery life; Burst Mode ensures µA-level sleep current between transmissions. Use Value: 3.5µA IQ directly determines standby current budget; fixed 3.3V eliminates calibration drift from resistor tolerance in adjustable versions. |
Use Scenario: DIN-rail mounted condition-monitoring node with vibration sensor, temperature sensor, and LoRaWAN radio. IC Role / Device Role / Timing Role: Primary 3.3V rail for mixed-signal SoC and analog front-end; must survive 24V industrial transients and operate at 85°C ambient. Use Value: 17V absolute max rating and 125°C operating range enable direct connection to 24V bus with minimal front-end filtering; SYNC pin allows EMI reduction via spread-spectrum clock alignment. |
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 | 2.7V–6V input, 3.3V fixed, 1.8µA IQ, 2MHz switching - lacks 17V rating and VIN OVP | Suitable only for single-cell Li-ion or USB-powered designs; not viable for 12V/24V industrial inputs | Select if input never exceeds 6V and sub-2µA IQ is mandatory; avoid for wide-VIN systems. |
| MP2451DT-LF-Z | 4.5V–36V input, 3.3V fixed, 2.5mA IQ, 2MHz - higher IQ, no Burst Mode, no PGOOD | Acceptable for cost-sensitive 12V automotive accessories but unsuitable for battery longevity-critical designs | Choose for high-input-voltage cost targets where 2.5mA IQ is acceptable and PGOOD is not required. |
Compared with TPS62840DRVR and MP2451DT-LF-Z, the LTC3624IMSE-3.3#PBF uniquely combines 17V input capability, 3.5µA shutdown IQ, integrated PGOOD, and selectable light-load modes - making it the only option capable of supporting both wide-input industrial sensors and multi-year battery life in portable medical devices.
Availability
LTC3624IMSE-3.3#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3624IMSE-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, datasheet documentation, and application engineering resources for all Linear-branded power ICs.
The LTC3624 family was designed specifically for ultra-low-power, wide-input synchronous buck conversion in portable and energy-constrained systems - emphasizing quiescent current optimization without sacrificing output accuracy or thermal robustness.
FAQ
What is the guaranteed operating temperature range for the LTC3624IMSE-3.3#PBF?
The LTC3624IMSE-3.3#PBF is specified and production-tested over –40°C to +125°C junction temperature. This I-grade rating ensures reliable operation in automotive under-hood environments, industrial control cabinets, and outdoor deployed sensors without derating. The 125°C maximum junction temperature is enforced by internal overtemperature protection that disables switching if exceeded.
Does the LTC3624IMSE-3.3#PBF require external feedback resistors?
No - the LTC3624IMSE-3.3#PBF is a fixed-output variant with internal feedback network set to 3.3V. The FB pin is internally connected to the output, eliminating external resistors and associated tolerance errors. This simplifies layout, improves accuracy (±1% over temperature), and removes a potential source of noise coupling in sensitive analog systems.
How does the MODE/SYNC pin configure light-load operation on the LTC3624IMSE-3.3#PBF?
The MODE/SYNC pin on the LTC3624IMSE-3.3#PBF selects among three distinct operating modes: tie to INTVCC for Burst Mode (3.5µA IQ, 800mA peak clamp), ground for pulse-skipping (lowest output ripple), or apply 1.0V–2.4V for forced continuous conduction. Each mode alters control loop behavior - Burst Mode maximizes battery life, while forced continuous ensures predictable EMI spectrum for EMC-critical designs.
What thermal design requirements apply to the LTC3624IMSE-3.3#PBF MSOP package?
The LTC3624IMSE-3.3#PBF uses a 12-lead MSOP with exposed thermal pad (Pin 13). To achieve the rated θJA = 40°C/W, the exposed pad must be soldered to a minimum 100mm² copper area on the PCB using at least 4 thermal vias (0.3mm diameter) to inner ground planes. Inadequate thermal pad connection increases junction temperature by >25°C at 2A load, risking premature thermal shutdown.
Can the LTC3624IMSE-3.3#PBF synchronize to an external clock, and what is the capture range?
Yes - the LTC3624IMSE-3.3#PBF can synchronize its 1MHz oscillator to an external clock applied to the MODE/SYNC pin, with a capture range of ±40% (600kHz–1.4MHz). Synchronization engages within 2–3 external clock cycles and releases within ~2µs of signal loss. This feature enables EMI reduction in dense PCB layouts by aligning switching edges with system clocks or spreading spectrum sources.
LTC3624IMSE-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
LTC3624IMSE-3.3#PBF FAQ
1.How can I place an order for LTC3624IMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IMSE-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 LTC3624IMSE-3.3#PBF reliable?
The price and inventory of LTC3624IMSE-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 LTC3624IMSE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IMSE-3.3#PBF?
LTC3624IMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IMSE-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 LTC3624IMSE-3.3#PBF?
For technical support, including LTC3624IMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IMSE-3.3#PBF requirements.
6.How does Aetrix verify that LTC3624IMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IMSE-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 LTC3624IMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IMSE-3.3#PBF?
All LTC3624IMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IMSE-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 LTC3624IMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC3624IMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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