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Analog Devices Inc. LTC3624IMSE-25#PBF
- Part No.:
- LTC3624IMSE-25#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624IMSE-25#PBF.pdf
- Description:
- IC REG BUCK 5V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LTC3624IMSE-25#PBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 2A synchronous step-down DC/DC regulator in a 12-lead MSOP package, delivering fixed 5V output from 2.7V–17V input with ±1% accuracy and 3.5µA quiescent current in Burst Mode-ideal for battery-powered portable instrumentation requiring ultra-low standby power.
For engineers reviewing the LTC3624IMSE-25#PBF datasheet, LTC3624IMSE-25#PBF pinout, LTC3624IMSE-25#PBF application, or LTC3624IMSE-25#PBF equivalent, key selection criteria include its 2.25MHz switching frequency for compact filter design, fixed 5V output with no external feedback resistors, integrated soft-start and overtemperature protection, and MODE/SYNC pin flexibility for ripple-efficiency trade-offs in space-constrained embedded systems.
Technical Context
The LTC3624IMSE-25#PBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across wide input (2.7V–17V) and load (0–2A) ranges. Its 2.25MHz oscillator supports ±40% synchronization to external clocks and features programmable operation modes via the MODE/SYNC pin: Burst Mode (3.5µA IQ), pulse-skipping (low ripple), or forced continuous (fixed frequency).
It integrates dual MOSFETs (115mΩ NMOS, 200mΩ PMOS at VIN=5V), a 0.6V reference amplifier, PGOOD comparator with ±7.5% window and 32-cycle blanking, and undervoltage lockout (2.4V–2.7V hysteresis) and overvoltage protection (18V–19V trip). The device enters 100% duty cycle dropout with ultralow IQ retention when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates need for external feedback divider; ensures precise rail for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz ±20% - enables use of small 2.2µH inductors and low-ESR ceramic capacitors for high-density PCB layouts. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on portable devices such as emergency radios and handheld test equipment. |
| Max Output Current | 2A continuous - supports demanding loads like RF transceivers or multi-sensor nodes without external current boosting. |
| Input Voltage Range | 2.7V to 17V - accommodates single-cell Li-ion (2.7V cutoff) through 12V industrial rails with seamless dropout transition. |
| Efficiency Peak | 95% at 5V/1A - minimizes thermal rise in sealed enclosures and reduces heatsinking requirements in compact designs. |
| Thermal Rating | –40°C to +125°C junction - qualified for industrial temperature operation with θJA = 40°C/W in MSOP package. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.4mm) with exposed thermal pad (Pin 13 = GND), rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node connection | Drives external inductor; requires low-inductance layout to minimize EMI and voltage overshoot during 2.25MHz switching. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7V–17V; must be bypassed with ≥10µF ceramic capacitor close to pins to suppress high-frequency ripple. |
| RUN (Pin 5) | Enable control input | Logic-high (>1.0V) enables regulation; tied low disables output and reduces IQ to 0.1µA shutdown state. |
| PGOOD (Pin 6) | Power-good status indicator | Open-drain output pulled low if VOUT deviates >±7.5%; includes 32-cycle blanking to reject transient glitches. |
| FB (Pin 8) | Feedback reference input | Internally connected to 5V output; no external resistor required-simplifies layout and improves accuracy vs adjustable versions. |
| INTVCC (Pin 9) | Built-in LDO output | Provides ~3.6V bias for internal circuitry; requires ≥2.2µF ceramic capacitor to GND for stability and noise rejection. |
| MODE/SYNC (Pin 10) | Operating mode selector | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous/sync (apply 1V–2.4V or external clock). |
| GND (Pins 11,12,13) | Signal and power ground | Exposed pad (Pin 13) must be soldered to PCB ground plane for thermal performance and electrical integrity. |
| NC (Pin 7) | No connect | Not internally bonded; leave unconnected-no routing or stitching required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year battery life in 10µA average-load applications like remote sensors. |
| Fixed 5V output | Eliminates external feedback resistors and associated tolerance errors-guarantees ±1% accuracy over line, load, and temperature. |
| 2.25MHz switching | Reduces inductor size by >2× vs 1MHz parts; supports compact 2.2µH/4.7µF output filters for portable form factors. |
| Internal soft-start | 1ms monotonic ramp prevents inrush current and output overshoot during power-up-no external components needed. |
| Dropout operation | Maintains regulation down to VIN = VOUT with 100% duty cycle and retains ultralow IQ-critical for Li-ion end-of-discharge support. |
| Overtemperature protection | Thermal shutdown at TJ >150°C (H-grade) or >125°C (I-grade); automatically recovers after cooldown-ensures robustness in sealed enclosures. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by single-cell Li-ion batteries with strict 10–100µA sleep current budgets. IC Role / Device Role / Timing Role: Primary 5V system rail regulator providing stable power to MCU, ADC, and display driver while maintaining sub-5µA quiescent draw. Use Value: Extends operational runtime by >30% vs comparable 1MHz regulators due to lower IQ and higher light-load efficiency at 2.25MHz. | Use Scenario: Compact emergency communication radios requiring reliable 5V supply from alkaline or NiMH battery packs under cold-weather conditions. IC Role / Device Role / Timing Role: Main DC/DC converter delivering regulated 5V to RF front-end and audio codec with dropout support down to 2.7V input. Use Value: Maintains full functionality during battery voltage sag-no brownout resets-while drawing only 3.5µA when idle. |
| General Purpose Step-Down Supplies | Industrial Sensor Nodes |
Use Scenario: Fixed-output 5V conversion in space-limited industrial controllers where BOM count and layout area are constrained. IC Role / Device Role / Timing Role: Drop-in 5V regulator replacing discrete buck solutions; integrates MOSFETs, compensation, and protection in one MSOP package. Use Value: Reduces component count by 8+ parts (inductor, diodes, resistors, caps) and eliminates feedback tuning-accelerating design validation. | Use Scenario: Wireless sensor modules deployed in factory environments with wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Power management IC supplying 5V to low-power MCU and analog front-end with guaranteed operation across full industrial temp range. Use Value: Delivers 95% peak efficiency at 1A load and maintains ±1% output accuracy without derating-reducing thermal margining overhead. |
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 | 2.5V–6V input, 5V fixed output, 2.25MHz, 3.5µA IQ, but only 1.5A max output current and no SYNC capability. | Suitable for lower-current 5V rails where external sync is unnecessary and input voltage is limited to ≤6V. | Select when input is strictly ≤6V and 1.5A suffices; avoid for 12V input or 2A loads. |
| MAX20077ATCB/V+T | 3.5V–36V input, 5V fixed, 2.1MHz, 2.5µA IQ, AEC-Q100 qualified, but requires external compensation and has no MODE pin. | Targeted at automotive infotainment and ADAS where extended VIN and qualification outweigh programmability needs. | Choose for automotive-grade 5V supplies; not recommended for consumer portables needing flexible light-load modes. |
Compared with TPS62865ARGTR and MAX20077ATCB/V+T, the LTC3624IMSE-25#PBF uniquely combines 2A capability, 2.7V–17V input, programmable MODE/SYNC, and industrial temperature rating in a single MSOP package-making it optimal for high-reliability portable and industrial 5V conversion where both performance headroom and design flexibility are required.
Availability
LTC3624IMSE-25#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 and traceable sourcing.
Supply support for LTC3624IMSE-25#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 continues its legacy of high-performance power management ICs with precision, efficiency, and reliability.
The LTC3624 product line delivers ultralow-IQ synchronous buck regulators optimized for battery longevity and compact footprint in portable, medical, and industrial applications-designed specifically for systems where standby power and thermal constraints dominate.
FAQ
What is the output voltage tolerance of the LTC3624IMSE-25#PBF over temperature and load?
The LTC3624IMSE-25#PBF provides a fixed 5.0V output with ±1% accuracy over the full –40°C to +125°C junction temperature range and 0–2A load, as specified in the Electrical Characteristics table under "VOUT Regulated Fixed Output Voltage" for LTC3624-25 variants. This includes line, load, and temperature effects-no external calibration required.
Does the LTC3624IMSE-25#PBF require external feedback resistors to set the output voltage?
No, the LTC3624IMSE-25#PBF is a fixed 5V output variant-its FB pin is internally connected to the regulated output, eliminating the need for external resistors. This simplifies layout, improves accuracy, and removes resistor tolerance and drift errors that affect adjustable versions.
Can the LTC3624IMSE-25#PBF synchronize to an external clock, and what is the acceptable frequency range?
Yes, the LTC3624IMSE-25#PBF can synchronize its 2.25MHz oscillator to an external clock applied to the MODE/SYNC pin. The capture range is ±40% of the nominal frequency-i.e., 1.35MHz to 3.15MHz-enabling EMI reduction and multi-rail timing alignment in complex systems.
What thermal performance can be expected from the LTC3624IMSE-25#PBF in a standard 2-layer PCB layout?
In a typical 2-layer board with 1in² copper pour connected to the exposed pad (Pin 13), the LTC3624IMSE-25#PBF achieves θJA ≈ 40°C/W as specified. At 2A load and 12V input, power dissipation is ~0.4W, resulting in ~16°C rise above ambient-well within the 125°C max junction limit without forced airflow.
How does the LTC3624IMSE-25#PBF behave during input voltage dropout near 5V?
When VIN drops to near 5V, the LTC3624IMSE-25#PBF enters 100% duty cycle dropout operation while maintaining regulation and retaining its 3.5µA Burst Mode quiescent current. Unlike many buck regulators, it sustains output accuracy and low IQ without requiring external LDO backup or mode switching.
LTC3624IMSE-25#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):
- 5V
- 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-25#PBF FAQ
1.How can I place an order for LTC3624IMSE-25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624IMSE-25#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-25#PBF reliable?
The price and inventory of LTC3624IMSE-25#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-25#PBF is usually 5 days.
3.What payment methods are accepted for LTC3624IMSE-25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624IMSE-25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624IMSE-25#PBF?
LTC3624IMSE-25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624IMSE-25#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-25#PBF?
For technical support, including LTC3624IMSE-25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624IMSE-25#PBF requirements.
6.How does Aetrix verify that LTC3624IMSE-25#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3624IMSE-25#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-25#PBF meets industry standards.
7.What is the process for return or replacement of LTC3624IMSE-25#PBF?
All LTC3624IMSE-25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624IMSE-25#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-25#PBF part is unused and in its original packaging.
Return procedure for LTC3624IMSE-25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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