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Analog Devices Inc. LTC3624HMSE-23.3#TRPBF
- Part No.:
- LTC3624HMSE-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624HMSE-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,048
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Product details
Overview
LTC3624HMSE-23.3#TRPBF 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 LTC3624HMSE-23.3#TRPBF datasheet, LTC3624HMSE-23.3#TRPBF pinout, LTC3624HMSE-23.3#TRPBF application, or LTC3624HMSE-23.3#TRPBF equivalent, key selection criteria include guaranteed 2.25MHz switching frequency, H-grade 150°C junction temperature rating, MSOP-12 package with exposed thermal pad, and fixed 3.3V output with no external feedback divider required.
Technical Context
The LTC3624HMSE-23.3#TRPBF uses constant-frequency peak current mode control with 2.25MHz nominal switching frequency (±40% sync range), enabling compact filter design. Its architecture includes integrated PMOS/NMOS power switches, internal LDO for INTVCC, and programmable operation modes via MODE/SYNC pin - Burst Mode (3.5µA IQ), pulse-skipping (low ripple), or forced continuous (stable frequency).
It features overtemperature protection, VIN overvoltage lockout (19V trip), undervoltage lockout (2.7V), and PGOOD with ±7.5% window and 32-cycle blanking delay. The device maintains ±1% VOUT accuracy across –40°C to 150°C junction temperature and supports 100% duty cycle operation for low-dropout regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates need for external resistor divider; ensures precise logic supply for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz (H-grade) - enables use of small 2.2µH inductors and ceramic capacitors; reduces solution footprint. |
| 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 (3.0–4.2V), multi-cell alkaline, and industrial 12V rails without pre-regulation. |
| Max Output Current | 2A - sufficient to power ARM Cortex-M microcontrollers, RF transceivers, and analog front-ends simultaneously. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive, industrial controls, and high-reliability embedded systems. |
| PGOOD Accuracy | ±7.5% window with 32-cycle delay - prevents false power-good assertions during load transients; ensures reliable system sequencing. |
Pinout & Package
Package: 12-Lead Plastic MSOP with exposed thermal pad (Pin 13 = GND), optimized for thermal performance in space-constrained layouts. Requires soldering of exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node connection | Drives external inductor; high dv/dt node requiring tight layout and Kelvin return path to minimize EMI. |
| VIN (Pins 3,4) | Main input supply | Accepts 2.7–17V; must be bypassed with ≥10µF ceramic capacitor placed adjacent to pins. |
| RUN (Pin 5) | Enable control input | Active-high logic; pull to GND disables regulator and reduces IQ to 0.1µA shutdown current. |
| PGOOD (Pin 6) | Power-good status indicator | Open-drain output; pulled high via external resistor when VOUT is within ±7.5% of 3.3V; 32-cycle blanking prevents glitching. |
| FB (Pin 8) | Feedback reference input | Internally tied to 3.3V output; no external divider needed - simplifies layout and improves noise immunity. |
| INTVCC (Pin 9) | Internal LDO output | 3.6V regulated supply for gate drivers and internal circuitry; requires ≥2.2µF ceramic bypass to GND. |
| MODE/SYNC (Pin 10) | Operation mode & clock sync | Tie to INTVCC for Burst Mode (3.5µA IQ); tie to GND for pulse-skipping (low ripple); apply 1–2.8V for forced continuous mode or external clock sync. |
| GND (Pins 11,12,13) | Signal and power ground | Exposes thermal pad (Pin 13) - must be soldered to large PCB copper area for θJC = 10°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 3.5µA quiescent current | Enables >1-year battery life in coin-cell–powered IoT sensors operating in deep sleep between wake-ups. |
| 2.25MHz fixed-frequency operation | Permits use of sub-3mm × 3mm inductors and eliminates audible noise; supports dense PCB layouts in handheld medical devices. |
| H-grade 150°C junction temperature rating | Validates operation in sealed enclosures or near heat sources (e.g., motor drivers, power converters) without derating. |
| Integrated soft-start (1ms) | Prevents inrush current into downstream capacitance; eliminates need for external timing components in power sequencers. |
| 100% duty cycle capability | Maintains regulation down to VIN = VOUT (e.g., 3.3V out from 3.4V LiFePO₄ cell), extending usable battery voltage range. |
Applications
| Battery-Powered Portable Instrumentation | Emergency Radios & Beacon Transmitters |
|---|---|
Use Scenario: Handheld multimeters, gas detectors, and portable oscilloscopes powered by AA/AAA or Li-ion batteries with variable input voltage. IC Role / Device Role / Timing Role: Primary 3.3V system rail generator; regulates down from decaying battery voltage while maintaining low IQ during standby. Use Value: 3.5µA quiescent current extends shelf life and operational runtime; 2.25MHz switching allows compact 2.2µH inductor and 10µF ceramic input cap. | Use Scenario: GPS-enabled emergency beacons and marine VHF radios requiring reliable startup and sustained operation from primary lithium batteries. IC Role / Device Role / Timing Role: Fixed 3.3V supply for MCU, GNSS receiver, and RF PA bias; supports cold-start at low battery voltage via 100% duty cycle. Use Value: ±1% output accuracy ensures stable ADC reference and RF synthesizer performance; H-grade temp rating guarantees operation at –40°C to +85°C ambient. |
| Industrial Sensor Nodes | Low-Power Embedded Controllers |
Use Scenario: Wireless temperature/humidity nodes in factory automation, deployed in unventilated enclosures with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Power management IC supplying 3.3V to ultra-low-power MCU and BLE radio; thermally coupled to PCB ground plane via exposed pad. Use Value: 150°C junction rating allows full 2A output even at elevated board temperatures; PGOOD with 32-cycle blanking ensures clean reset signaling during transient loads. | Use Scenario: Programmable logic controllers (PLCs) and motor drive interface modules requiring robust 3.3V logic supply with fault reporting. IC Role / Device Role / Timing Role: Secondary regulated rail for FPGA configuration, isolated communication interfaces (RS-485, CAN), and real-time clocks. Use Value: SYNC capability allows synchronization to system master clock to reduce EMI; overvoltage lockout (19V) protects against 24V field wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864ARGTR | 2.4MHz fixed frequency, 3.3V fixed output, 2.5A rating, 2.5µA IQ, but only rated to 125°C junction temperature. | Lacks H-grade thermal qualification; unsuitable for under-hood or sealed high-temp environments where LTC3624HMSE-23.3#TRPBF's 150°C rating is required. | Select TPS62864ARGTR only if ambient temperature stays below 75°C and higher output current margin is needed. |
| MP2451DT-LF-Z | 2MHz fixed frequency, adjustable output (0.8–15V), 2A rating, 26µA IQ, MSOP-8 package, no PGOOD or SYNC. | Requires external feedback resistors; lacks power-good signaling and clock synchronization - limiting use in sequenced or noise-sensitive systems. | Choose MP2451DT-LF-Z only for cost-sensitive, non-critical applications where PGOOD and SYNC are unnecessary. |
Compared with TPS62864ARGTR and MP2451DT-LF-Z, the LTC3624HMSE-23.3#TRPBF uniquely combines H-grade 150°C operation, integrated PGOOD with blanking, and flexible MODE/SYNC control - making it the only option qualified for high-reliability, thermally demanding, and system-synchronized power designs.
Availability
LTC3624HMSE-23.3#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency communication devices, and industrial sensor nodes requiring stable component supply with long-term lifecycle support.
Supply support for LTC3624HMSE-23.3#TRPBF 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 automotive and industrial qualification standards.
The LTC3624 family is designed for ultra-low-quiescent-current DC/DC conversion in portable and energy-constrained systems, emphasizing efficiency across wide load ranges and robust operation in harsh thermal environments.
FAQ
What is the guaranteed switching frequency tolerance for LTC3624HMSE-23.3#TRPBF across temperature and voltage?
The LTC3624HMSE-23.3#TRPBF has a guaranteed oscillator frequency of 2.25MHz ±20% over the full –40°C to +150°C junction temperature range and 2.7V to 17V input voltage. Electrical Characteristics table specifies min/max values of 1.7MHz to 2.6MHz for H-grade parts, confirming this tolerance. This stability enables predictable EMI filtering and consistent inductor sizing in production designs using LTC3624HMSE-23.3#TRPBF.
Does LTC3624HMSE-23.3#TRPBF require external feedback resistors to set its 3.3V output?
No. The LTC3624HMSE-23.3#TRPBF is a fixed-output variant: its FB pin is internally connected to the 3.3V output, eliminating the need for external resistors. This simplifies layout, improves noise immunity, and ensures ±1% output accuracy without resistor tolerance errors. External feedback is only required for adjustable versions like LTC3624HMSE-2#TRPBF - not for LTC3624HMSE-23.3#TRPBF.
How does the MODE/SYNC pin function on LTC3624HMSE-23.3#TRPBF in Burst Mode versus pulse-skipping mode?
On LTC3624HMSE-23.3#TRPBF, tying MODE/SYNC to INTVCC enables Burst Mode (3.5µA IQ, 800mA peak clamp); grounding it selects pulse-skipping mode (lower VOUT ripple, ~132mA peak clamp). Both modes automatically engage at light loads. Pulse-skipping avoids burst-related output voltage steps but trades off efficiency - critical for noise-sensitive analog circuits powered by LTC3624HMSE-23.3#TRPBF.
What thermal performance can be expected from LTC3624HMSE-23.3#TRPBF in a standard 2-layer PCB layout?
With the exposed thermal pad (Pin 13) soldered to a ≥1cm² internal or external GND copper plane, LTC3624HMSE-23.3#TRPBF achieves θJA ≈ 40°C/W and θJC = 10°C/W. At 2A load and 12V input, typical power dissipation is ~0.4W; this yields ~16°C rise above ambient - well within the 150°C max junction limit. Thermal performance degrades significantly if the pad is left unsoldered, so proper pad attachment is mandatory for LTC3624HMSE-23.3#TRPBF reliability.
Is LTC3624HMSE-23.3#TRPBF compatible with external clock synchronization, and what is the capture range?
Yes. LTC3624HMSE-23.3#TRPBF supports external clock synchronization via the MODE/SYNC pin with a capture range of ±40% around its nominal 2.25MHz frequency - i.e., 1.35MHz to 3.15MHz. Once locked, it immediately adopts the external clock frequency with <2µs release time upon loss of sync. This feature reduces system-level EMI by aligning switching edges across multiple regulators in the same design using LTC3624HMSE-23.3#TRPBF.
LTC3624HMSE-23.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624HMSE-23.3#TRPBF FAQ
1.How can I place an order for LTC3624HMSE-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624HMSE-23.3#TRPBF 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 LTC3624HMSE-23.3#TRPBF reliable?
The price and inventory of LTC3624HMSE-23.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3624HMSE-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624HMSE-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624HMSE-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624HMSE-23.3#TRPBF?
LTC3624HMSE-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624HMSE-23.3#TRPBF 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 LTC3624HMSE-23.3#TRPBF?
For technical support, including LTC3624HMSE-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624HMSE-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624HMSE-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624HMSE-23.3#TRPBF 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 LTC3624HMSE-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624HMSE-23.3#TRPBF?
All LTC3624HMSE-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624HMSE-23.3#TRPBF, 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 LTC3624HMSE-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624HMSE-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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