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Analog Devices Inc. LTC3624IMSE-23.3#PBF
- Part No.:
- LTC3624IMSE-23.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624IMSE-23.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LTC3624IMSE-23.3#PBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 2A output current with 3.5µA quiescent current and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports 100% duty cycle dropout, and integrates internal compensation and soft-start. It is used in battery-powered portable instrumentation requiring ultra-low IQ and stable 3.3V rail generation.
For engineers reviewing the LTC3624IMSE-23.3#PBF datasheet, LTC3624IMSE-23.3#PBF pinout, LTC3624IMSE-23.3#PBF application, or LTC3624IMSE-23.3#PBF equivalent, key selection criteria include its 2.25MHz switching frequency for compact filter design, guaranteed 3.3V ±1% output over temperature, 2A continuous load capability, and Burst Mode® operation enabling 3.5µA IQ at light loads.
Technical Context
The LTC3624IMSE-23.3#PBF employs a constant-frequency peak current mode control architecture with internal slope compensation, enabling stable operation across wide input and load ranges. Its 2.25MHz oscillator supports synchronization to an external clock within ±40% range and features programmable operating modes via the MODE/SYNC pin: Burst Mode® (ultra-low IQ), pulse-skipping (low ripple), or forced continuous (fixed-frequency).
It integrates dual MOSFET power switches (PMOS high-side, NMOS low-side), a 0.6V reference error amplifier, PGOOD comparator with 32-cycle blanking, and overtemperature protection. The fixed 3.3V output eliminates external feedback resistors, and the 1ms internal soft-start prevents inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over –40°C to 125°C junction temperature - ensures reliable logic-level supply without external resistor network. |
| Switching Frequency | 2.25MHz (±10% typical) - enables use of small 2.2µH inductors and compact ceramic capacitors for space-constrained designs. |
| Quiescent Current | 3.5µA in Burst Mode® - extends battery life in always-on portable devices such as emergency radios and handheld meters. |
| Input Voltage Range | 2.7V to 17V - supports single-cell Li-ion (2.7–4.2V), 5V/12V rails, and wide-input industrial supplies. |
| Output Current | 2A continuous - sufficient to power microcontrollers, sensors, and RF modules from a single buck stage. |
| Efficiency | Up to 95% at full load - minimizes thermal rise in sealed enclosures and reduces heat sink requirements. |
| Duty Cycle | 100% - maintains regulation down to VIN = VOUT, critical for brownout resilience in battery discharge scenarios. |
Pinout & Package
Package: 12-Lead Plastic MSOP with exposed pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square wave - must be routed with minimal loop area to reduce EMI. |
| VIN (Pins 3, 4) | Main input supply | Accepts 2.7V–17V; powers internal circuitry and high-side switch - requires local 10µF ceramic bypass close to pins. |
| RUN (Pin 5) | Enable control | Active-high logic input; pulls low to disable regulator and reduce VIN current to <0.1µA - used for system-level power sequencing. |
| PGOOD (Pin 6) | Power good indicator | Open-drain output pulled low if VOUT deviates >±7.5% - provides 32-cycle blanking to reject transient glitches during load steps. |
| FB (Pin 8) | Feedback input | Internally tied to 3.3V output - no external divider required; simplifies layout and improves accuracy vs adjustable versions. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - must be bypassed with ≥2.2µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 10) | Operating mode select | Configures Burst Mode® (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (1V–2.4V); also accepts external sync clock. |
| GND (Pins 11, 12, Exposed Pad 13) | Signal and power ground | Low-impedance return path for all currents - exposed pad must be soldered to thermal pad on PCB for θJA = 40°C/W. |
| 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 quiescent current to 3.5µA while maintaining regulation - ideal for battery backup and sensor wake-up circuits. |
| 2.25MHz fixed switching frequency | Enables sub-3mm inductor height and eliminates audible noise - suitable for wearables and medical handhelds. |
| 100% duty cycle capability | Maintains 3.3V output even as input drops to 3.3V - extends usable battery voltage range by ~15% in Li-ion applications. |
| Integrated soft-start (1ms) | Prevents output overshoot and inrush current during power-up - eliminates need for external timing components. |
| Overtemperature protection | Shuts down regulator above 150°C junction temperature - protects against thermal runaway in enclosed environments. |
| PGOOD with 32-cycle blanking | Rejects short-duration load transients that would otherwise falsely trigger system reset - improves system reliability. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by two AA alkaline cells (1.8–3.2V) requiring stable 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary DC/DC converter generating clean, low-noise 3.3V rail with ultralow standby current to maximize battery life between measurements. Use Value: 3.5µA IQ extends shelf life beyond 5 years in sleep mode; 100% duty cycle sustains operation until cell voltage falls to 3.3V. | Use Scenario: Solar-charged emergency radio with LiFePO₄ battery (2.5–3.65V) needing robust 3.3V supply during grid-out events. IC Role / Device Role / Timing Role: Main power regulator delivering 2A peak to audio amplifier and digital receiver during voice transmission bursts. Use Value: 95% efficiency minimizes self-heating in sealed enclosure; PGOOD blanking prevents false shutdown during speaker pop transients. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: DIN-rail mounted PLC I/O module converting 12–24V DC to 3.3V for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Compact, high-reliability buck converter replacing discrete solutions - operates across full industrial temperature range (–40°C to 125°C). Use Value: Guaranteed ±1% output accuracy ensures consistent ADC reference and digital logic margins; MSOP package fits tight board spacing. | Use Scenario: Wireless vibration sensor node powered by primary lithium battery (3.6V), transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Always-on power management IC supplying 3.3V to ultra-low-power MCU and BLE radio during deep-sleep cycles. Use Value: Burst Mode® reduces average current to <1µA during 99.9% of duty cycle - enables 10+ year battery life per ANSI/ISA-100.11a standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62865ARGTR | 3.3V fixed, 2.5MHz, 2A, 1.2µA IQ - lower quiescent current but only rated to 125°C junction temp. | Preferred for consumer wearables where ambient temperature stays below 85°C and lowest possible IQ is critical. | Select when maximum ambient temperature remains ≤85°C and 1.2µA IQ outweighs extended temperature guarantee. |
| MP2451DT-LF-Z | 3.3V fixed, 2MHz, 2A, 260µA IQ - higher IQ, no Burst Mode®, no PGOOD, MSOP-8 package. | Suitable for cost-sensitive industrial controls where 260µA IQ is acceptable and PGOOD is not required. | Choose for budget-limited designs where thermal derating and power-good monitoring are not mandatory. |
Compared with TPS62865ARGTR and MP2451DT-LF-Z, the LTC3624IMSE-23.3#PBF offers superior thermal ruggedness (125°C guaranteed), integrated PGOOD with blanking, and proven Burst Mode® stability in long-term battery applications - making it optimal for mission-critical portable equipment.
Availability
LTC3624IMSE-23.3#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3624IMSE-23.3#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 its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3624 series is designed for ultra-low-power, wide-input-voltage DC/DC conversion in portable and energy-harvesting systems - emphasizing quiescent current optimization, thermal resilience, and ease of integration.
FAQ
What is the guaranteed operating junction temperature range for the LTC3624IMSE-23.3#PBF?
The LTC3624IMSE-23.3#PBF is guaranteed to operate over –40°C to +125°C junction temperature. This "I-grade" rating is validated through production testing and thermal characterization - unlike E-grade parts, which are only assured over 0°C to 85°C. The 12-Lead MSOP package with exposed pad achieves θJA = 40°C/W when properly soldered to a 2-in² copper pour, enabling reliable operation in sealed enclosures at 70°C ambient with 2A load.
Can the LTC3624IMSE-23.3#PBF be synchronized to an external clock, and what is the allowable frequency range?
Yes, the LTC3624IMSE-23.3#PBF supports external clock synchronization via the MODE/SYNC pin. When driven by a CMOS-compatible square wave, it locks to frequencies from 1.26MHz to 3.15MHz - a ±40% window around its nominal 2.25MHz oscillator. Sync acquisition occurs within 2–3 external clock cycles, and loss-of-sync detection takes ~2µs. This feature allows EMI reduction through spread-spectrum alignment or co-location with system clocks in multi-rail power architectures.
Does the LTC3624IMSE-23.3#PBF require external feedback resistors to set the 3.3V output?
No, the LTC3624IMSE-23.3#PBF has the 3.3V feedback divider internally trimmed and connected - the FB pin is internally tied to the output. No external resistors are needed, eliminating tolerance errors, layout sensitivity, and component count. This configuration delivers ±1% output accuracy over temperature and line, verified across production lots. For adjustable versions like LTC3624IMSE-2#PBF, external resistors are required.
How does the PGOOD pin of the LTC3624IMSE-23.3#PBF behave during load transients?
The PGOOD pin of the LTC3624IMSE-23.3#PBF asserts high when VOUT is within ±7.5% of 3.3V and deasserts low after 32 consecutive switching cycles outside that window. This 32-cycle blanking (≈14.2µs at 2.25MHz) prevents false trips during fast load steps or output capacitor ESR-induced dips. Once regulation is restored, PGOOD returns high immediately - no delay. The open-drain output requires an external pull-up resistor (typically 10kΩ to INTVCC or system rail).
What is the minimum on-time limitation of the LTC3624IMSE-23.3#PBF, and how does it affect low-VIN/high-VOUT operation?
The LTC3624IMSE-23.3#PBF has a typical minimum on-time of 60ns. At 2.25MHz, this imposes a practical minimum duty cycle of ~13.5%, limiting the lowest sustainable VIN to approximately 3.3V / 0.135 ≈ 24.4V - but since max VIN is 17V, this constraint does not apply. However, in forced continuous mode near dropout (VIN ≈ 3.3V), the controller automatically transitions to 100% duty cycle, bypassing minimum on-time enforcement to maintain regulation - a key distinction from voltage-mode controllers.
LTC3624IMSE-23.3#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624IMSE-23.3#PBF FAQ
1.How can I place an order for LTC3624IMSE-23.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IMSE-23.3#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-23.3#PBF reliable?
The price and inventory of LTC3624IMSE-23.3#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-23.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IMSE-23.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IMSE-23.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IMSE-23.3#PBF?
LTC3624IMSE-23.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IMSE-23.3#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-23.3#PBF?
For technical support, including LTC3624IMSE-23.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IMSE-23.3#PBF requirements.
6.How does Aetrix verify that LTC3624IMSE-23.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IMSE-23.3#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-23.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IMSE-23.3#PBF?
All LTC3624IMSE-23.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IMSE-23.3#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-23.3#PBF part is unused and in its original packaging.
Return procedure for LTC3624IMSE-23.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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