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Analog Devices Inc. LTC3624HMSE-3.3#TRPBF
- Part No.:
- LTC3624HMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3624HMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 2A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,997
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Product details
Overview
LTC3624HMSE-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down DC/DC 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 and emergency radios requiring ultra-low power consumption and stable low-noise supply.
For engineers reviewing the LTC3624HMSE-3.3#TRPBF datasheet, LTC3624HMSE-3.3#TRPBF pinout, LTC3624HMSE-3.3#TRPBF application, or LTC3624HMSE-3.3#TRPBF equivalent, key selection criteria include its H-grade temperature range (–40°C to 150°C), fixed-output configuration eliminating external feedback resistors, Burst Mode® operation for sub-µA light-load IQ, and internal soft-start and overtemperature protection.
Technical Context
The LTC3624HMSE-3.3#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling fast line and load transient response. It supports three operating modes-Burst Mode®, pulse-skipping, and forced continuous-selected via the MODE/SYNC pin, each delivering distinct trade-offs between output ripple and light-load efficiency.
It integrates both PMOS high-side and NMOS low-side power switches with RDS(ON) of 200mΩ (top) and 115mΩ (bottom) at VIN = 5V, and features built-in VINTVCC LDO (3.2V to 4.0V), PGOOD monitoring with ±7.5% window and 32-cycle delay, and undervoltage lockout (2.4V to 2.7V) with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1% accuracy over –40°C to 150°C junction temperature-enables direct connection to 3.3V logic without external feedback divider. |
| Input Voltage Range | 2.7V to 17V-supports single-cell Li-ion, dual-cell alkaline, and wide industrial input rails. |
| Max Output Current | 2A continuous-sufficient for powering microcontrollers, RF modules, and sensor interfaces. |
| Quiescent Current | 3.5µA in shutdown, ≤7µA in Burst Mode®-extends battery life in always-on portable equipment. |
| Switching Frequency | 1MHz (±20% over temp)-allows compact 2.2µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Thermal Rating | H-grade: –40°C to 150°C max junction temperature with θJA = 40°C/W-suitable for under-hood automotive or high-ambient industrial environments. |
| Protection Features | Overtemperature shutdown, VIN overvoltage lockout (18V–20V), and PGOOD with 32-cycle blanking-ensures robust system-level fault handling without external circuitry. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.02mm) with exposed thermal pad (Pin 13), rated for –40°C to 150°C operation. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SW | Switch node connecting to inductor-carries high di/dt square wave; requires tight layout and low-inductance path to minimize EMI. |
| 3, 4 | VIN | Main input supply (2.7V–17V); bypassed internally by VINTVCC LDO and externally with ≥10µF ceramic capacitor. |
| 5 | RUN | Logic-enable input; pulled high to activate regulator, grounded to disable-supports system-level power sequencing. |
| 6 | PGOOD | Open-drain status flag indicating VOUT within ±7.5% regulation; includes 32-cycle blanking to reject transient-induced false trips. |
| 8 | FB | Feedback input-internally tied to 3.3V output in fixed-VOUT variants; no external resistor required. |
| 9 | INTVCC | Internally regulated 3.6V LDO output-powers gate drivers and analog circuitry; requires ≥2.2µF ceramic bypass to GND. |
| 10 | MODE/SYNC | Multi-function pin: tie to INTVCC for Burst Mode®, to GND for pulse-skipping, or to external clock (1MHz ±40%) for synchronization. |
| 11, 12, 13 | GND / Exposed Pad | Signal and power ground; exposed pad (Pin 13) is electrically GND and mandatory for thermal conduction and noise immunity. |
| 7 | NC | No connect-no internal bond wire or circuit connection; left unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 3.5µA at light loads while maintaining regulation-critical for multi-year battery life in IoT sensors. |
| Fixed 3.3V Output | Eliminates external feedback resistors and associated tolerance errors-simplifies BOM and improves long-term output stability. |
| H-Temperature Grade | Guaranteed operation up to 150°C junction temperature-enables use in high-ambient environments without derating. |
| Internal Soft-Start | 1ms controlled ramp prevents inrush current and output overshoot during power-up-removes need for external soft-start circuitry. |
| Synchronization Capability | Accepts external clock from 0.6MHz to 1.4MHz-allows EMI reduction via frequency dithering or alignment with system clocks. |
Applications
| Battery-Powered Instrumentation | Emergency Radios |
|---|---|
Use Scenario: Portable multimeters and handheld data loggers powered by two AA cells (2.4V–3.2V) requiring clean, regulated 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3V from variable input; operates in Burst Mode® during sleep to extend battery life beyond 5 years. Use Value: 3.5µA shutdown IQ and 100% duty-cycle dropout capability maintain regulation down to 3.3V input-eliminating brownouts during battery depletion. | Use Scenario: Hand-crank or solar-charged emergency radios needing reliable 3.3V supply across wide input transients (e.g., 4V–15V). IC Role / Device Role / Timing Role: Main power converter with VIN overvoltage lockout (19V) and PGOOD monitoring-ensures safe operation during solar surge events. Use Value: ±1% output accuracy and internal soft-start prevent audio distortion during startup; H-grade rating ensures functionality in hot vehicle cabins. |
| Industrial Sensor Nodes | Low-Power Wireless Modules |
Use Scenario: Wireless temperature/humidity nodes in factory settings where ambient temperature reaches 85°C+ and supply is 12V rail. IC Role / Device Role / Timing Role: Efficient 12V-to-3.3V conversion with thermal shutdown at 150°C-protects against enclosure overheating failures. Use Value: 95% peak efficiency at 1A load minimizes self-heating; 40°C/W θJA enables compact heatsink-free design. | Use Scenario: BLE/Wi-Fi modules intermittently transmitting bursts, drawing 10mA average but 200mA peaks. IC Role / Device Role / Timing Role: High-efficiency buck supplying 3.3V to RF IC and MCU; uses pulse-skipping mode to suppress output ripple during active transmission. Use Value: 1MHz switching allows small 2.2µH inductor and <100mVpp ripple-prevents RF interference and maintains link budget integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 2.7V–6.5V input, 3.3V fixed, 1.8µA IQ, 2.25MHz-lower IQ but narrower VIN range and no H-grade option. | Best for space-constrained consumer wearables; unsuitable for 12V industrial inputs or >125°C ambient. | Select if input is always ≤6.5V and ultra-low IQ dominates over thermal robustness. |
| MAX17504ATP+ | 4.5V–60V input, adjustable output, 100µA IQ, 100kHz–2.2MHz sync-wider VIN but higher IQ and no fixed-3.3V variant. | Preferred for high-voltage industrial supplies; requires external feedback network and adds design complexity. | Select when input exceeds 17V or programmable output is required; not drop-in for fixed 3.3V use. |
Compared with TPS62840DLCR and MAX17504ATP+, the LTC3624HMSE-3.3#TRPBF uniquely combines 17V max input, fixed 3.3V output, 3.5µA IQ, and guaranteed 150°C operation-making it the only choice for ruggedized, wide-input, battery-backed systems demanding zero-resistor simplicity and extended thermal margin.
Availability
LTC3624HMSE-3.3#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3624HMSE-3.3#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous reliability testing and automotive-grade qualification.
The LTC3624 product line delivers ultralow-quiescent-current synchronous buck regulators for energy-sensitive applications-specifically engineered to maximize runtime in battery-operated systems while maintaining precision regulation and thermal resilience.
FAQ
What is the maximum junction temperature specification for the LTC3624HMSE-3.3#TRPBF?
The LTC3624HMSE-3.3#TRPBF is an H-grade device with a guaranteed operating junction temperature range of –40°C to 150°C. This rating is production-tested and supported by θJA = 40°C/W and θJC = 10°C/W thermal metrics. The exposed pad (Pin 13) must be soldered to PCB ground to achieve this thermal performance-failure to do so may cause premature thermal shutdown or reduced lifetime.
Does the LTC3624HMSE-3.3#TRPBF require external feedback resistors?
No, the LTC3624HMSE-3.3#TRPBF is a fixed-output variant with internal feedback set to 3.3V. The FB pin is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves long-term output accuracy by removing resistor drift and tolerance errors, and reduces BOM count-unlike adjustable versions such as the LTC3624HMSE#TRPBF.
How does the MODE/SYNC pin function on the LTC3624HMSE-3.3#TRPBF?
The MODE/SYNC pin on the LTC3624HMSE-3.3#TRPBF selects operating mode: tie to INTVCC for Burst Mode® (lowest IQ), to GND for pulse-skipping (lowest ripple), or to an external clock (0.6–1.4MHz) for synchronization. In fixed-output variants, it does not affect output voltage setting. The pin draws <100nA, enabling simple resistor-divider or direct connection without loading concerns.
What protection features are integrated into the LTC3624HMSE-3.3#TRPBF?
The LTC3624HMSE-3.3#TRPBF integrates overtemperature shutdown, VIN overvoltage lockout (19V trip, 18.5V release), VINTVCC undervoltage lockout (2.4V–2.7V), and PGOOD with ±7.5% window and 32-cycle blanking. These functions operate autonomously without external components-reducing system-level protection circuitry and improving reliability in harsh environments.
Can the LTC3624HMSE-3.3#TRPBF operate in 100% duty cycle dropout mode?
Yes, the LTC3624HMSE-3.3#TRPBF supports 100% duty cycle operation when VIN approaches VOUT, maintaining regulation down to VIN = 3.3V. In forced continuous mode, the top PMOS switch remains fully on; in Burst Mode® or pulse-skipping, it transitions in/out of sleep to sustain ultralow IQ. This capability is critical for battery-powered systems nearing end-of-life voltage.
LTC3624HMSE-3.3#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3624HMSE-3.3#TRPBF FAQ
1.How can I place an order for LTC3624HMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3624HMSE-3.3#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-3.3#TRPBF reliable?
The price and inventory of LTC3624HMSE-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3624HMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3624HMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3624HMSE-3.3#TRPBF?
LTC3624HMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3624HMSE-3.3#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-3.3#TRPBF?
For technical support, including LTC3624HMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3624HMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3624HMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3624HMSE-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3624HMSE-3.3#TRPBF?
All LTC3624HMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3624HMSE-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3624HMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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