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Analog Devices Inc. LTC3630AHMSE#TRPBF
- Part No.:
- LTC3630AHMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3630AHMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,667
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Product details
Overview
LTC3630AHMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 76V-input synchronous step-down DC/DC converter with integrated high-side and low-side power MOSFETs, delivering up to 500mA output current, featuring 12µA no-load quiescent current, 0.8V ±1% feedback reference, and programmable peak current limit (0.09A–1.4A). It enables robust industrial power conversion in automotive and avionics systems where wide VIN (4V–76V) and thermal resilience are critical.
For engineers reviewing the LTC3630AHMSE#TRPBF datasheet, LTC3630AHMSE#TRPBF pinout, LTC3630AHMSE#TRPBF application, or LTC3630AHMSE#TRPBF equivalent, key selection criteria include its 150°C junction-rated MSOP-16 package, Burst Mode® operation for ultra-low light-load efficiency, internal soft-start, and FBO-enabled current paralleling capability - all validated for high-reliability embedded power rails.
Technical Context
The LTC3630AHMSE#TRPBF implements a hysteretic Burst Mode® control architecture with internal P-channel high-side and N-channel low-side MOSFETs, enabling 100% duty-cycle dropout operation and inherent short-circuit protection via reverse-current detection. Its feedback comparator monitors VFB against a precision 0.8V reference, while the RUN pin provides programmable UVLO with 110mV hysteresis.
Peak inductor current is set by an external resistor on ISET (0.09A–1.4A typical), directly determining maximum average output current (half the peak value). The FBO pin supports master-slave paralleling of multiple LTC3630A units to scale output current beyond 500mA without external current-sharing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 24V/48V industrial buses, 12V–72V automotive batteries, and unregulated HV sources. |
| Max Output Current | 500mA - determined by 1.2A typical peak current limit; adjustable down to 100mA peak (50mA avg) for low-power applications. |
| Quiescent Current | 12µA in sleep mode - enables multi-year battery life in always-on monitoring systems with intermittent load activity. |
| Feedback Reference | 0.800V ±1% - ensures ±1.25% output voltage accuracy over temperature and line for stable analog/ADC reference rails. |
| Package & Temp Range | MSE16 (MSOP-16) with exposed pad; rated for –40°C to +150°C junction - qualified for under-hood automotive and avionics environments. |
| Switch On-Resistance | Top switch: 1.00Ω, bottom switch: 0.53Ω - limits conduction loss at 500mA, enabling >90% efficiency at mid-load with proper inductor selection. |
| Soft-Start Time | 0.8ms internal default; externally programmable via SS pin capacitor - prevents input droop during cold start in multi-rail systems. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm footprint, 0.75mm profile, with exposed thermal pad (Pin 17) soldered to PCB ground for θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point for external inductor; carries full switching current and high dv/dt - requires tight layout and Kelvin grounding. |
| VIN (3) | Main input supply | Accepts 4V–76V; must be bypassed with low-ESR ceramic capacitor near pin to suppress high-frequency noise and supply ripple. |
| RUN (5) | Enable/UVLO control | 1.21V rising threshold with 110mV hysteresis; enables precise input monitoring or resistor-divider-based startup sequencing. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode (both grounded); eliminates external feedback resistors in standard-output designs. |
| GND (8,14,16,17) | Ground reference & thermal path | Multiple GND pins plus exposed pad - mandatory soldering to large PCB copper area ensures thermal reliability at 150°C junction. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; in fixed-output mode, connected directly to VOUT; in adjustable mode, tied to resistor divider. |
| SS (10) | Soft-start timing | 5µA current source charges external capacitor; 16.5nF = 1ms ramp - controls inrush current and avoids system brownout during power-up. |
| ISET (11) | Peak current programming | Resistor to GND sets peak current (0.09A–1.4A); determines max output current, inductor size, and light-load ripple trade-off. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) - enables parallel operation by connecting master FBO to slave VFB pins. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated P-ch high-side and N-ch low-side MOSFETs eliminate external diode losses, enabling >92% efficiency at 500mA with 12V→5V conversion. |
| Burst Mode® Operation | Reduces no-load IQ to 12µA while maintaining regulation - extends battery runtime in IoT sensors and portable medical devices. |
| Programmable Peak Current Limit | Adjustable from 0.09A to 1.4A via ISET resistor - allows optimization of inductor/capacitor size and light-load ripple for space-constrained designs. |
| 100% Duty-Cycle Dropout | P-channel top switch enables continuous conduction down to VIN ≈ VOUT - supports seamless operation during automotive cold-crank (VIN dips to 3.5V). |
| Multi-Unit Paralleling Support | FBO pin enables master-slave configuration without external current-sense amplifiers - scales output current to 1A+ with matched thermal performance. |
Applications
| Automotive Power Rail | Industrial Sensor Node |
|---|---|
|
Use Scenario: Regulating 12V battery to 3.3V for CAN transceiver, microcontroller, and analog front-end in engine control unit. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic and interface ICs; operates continuously across –40°C to +150°C ambient. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep mode; 76V abs-max rating withstands load-dump transients up to 60V. |
Use Scenario: Powering wireless vibration sensor with MCU, ADC, and RF transceiver in predictive maintenance system. IC Role / Device Role / Timing Role: Standby-mode DC/DC converter enabling years of operation on primary lithium thionyl chloride cell. Use Value: Burst Mode® maintains 3.3V rail at <15µA total system current during 99% idle time; programmable ISET minimizes inductor size. |
| Avionics Remote I/O Module | Medical Patient Monitor Auxiliary Supply |
|
Use Scenario: Converting 28V aircraft bus to isolated 5V for digital isolators and FPGA configuration in flight data acquisition unit. IC Role / Device Role / Timing Role: High-reliability non-isolated buck stage preceding isolated DC/DC; operates in extended temperature range with derated lifetime. Use Value: MSE16 package with exposed pad sustains 150°C junction under sustained 400mA load; FBO pin enables redundant current sharing. |
Use Scenario: Generating clean 1.8V supply for high-resolution ADC and low-noise op-amps in bedside vital signs monitor. IC Role / Device Role / Timing Role: Precision low-noise power stage; uses adjustable feedback with tight-tolerance resistors for ±0.5% output accuracy. Use Value: 0.8V ±1% reference and low output ripple (<10mVpp) ensure <1 LSB error in 24-bit medical ADC conversions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630AIMSE#TRPBF | Same silicon, rated for –40°C to +125°C junction (vs. +150°C for LTC3630AHMSE#TRPBF); identical electrical specs and pinout. | Not qualified for under-hood automotive or high-temp avionics; suitable for industrial control cabinets with forced air cooling. | Select when ambient temperature remains ≤110°C and cost sensitivity outweighs extended temp qualification. |
| LM5164QDDARQ1 | 4.5V–65V input, 500mA, integrated MOSFETs, but uses constant-on-time (COT) control (not Burst Mode®); 25µA IQ vs. 12µA. | Lacks FBO paralleling and 100% duty-cycle dropout; requires external compensation; AEC-Q100 Grade 1 qualified. | Prefer for automotive applications requiring AEC-Q100 certification where 125°C ambient suffices and lower IQ is not critical. |
Compared with LTC3630AIMSE#TRPBF, the LTC3630AHMSE#TRPBF delivers guaranteed operation up to 150°C junction - essential for sealed enclosures without airflow - while LM5164QDDARQ1 offers automotive qualification but sacrifices light-load efficiency and paralleling flexibility.
Availability
LTC3630AHMSE#TRPBF is available at Aetrix Electronics and suitable for automotive power rails, industrial sensor nodes, avionics remote I/O modules, and medical patient monitor auxiliary supplies requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC3630AHMSE#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3630A belongs to Linear's high-voltage monolithic buck converter family, designed specifically for ruggedized embedded power in automotive, industrial, and aerospace applications where wide input range and ultra-low quiescent current are mandatory.
FAQ
What is the maximum junction temperature rating for the LTC3630AHMSE#TRPBF?
The LTC3630AHMSE#TRPBF is specified for operation from –40°C to +150°C junction temperature, verified per manufacturer test conditions. This rating enables use in under-hood automotive locations and sealed avionics enclosures where ambient temperatures exceed 125°C. Derating curves in the datasheet define safe operating area based on PCB copper area and airflow. The LTC3630AHMSE#TRPBF achieves this via enhanced thermal design of the MSE16 package and internal process optimizations.
How does the FBO pin enable current paralleling in the LTC3630AHMSE#TRPBF?
The FBO (Feedback Comparator Output) pin on the LTC3630AHMSE#TRPBF is an open-drain output that signals when the internal feedback comparator trips. Connecting the FBO of a master LTC3630AHMSE#TRPBF to the VFB pins of one or more slave units forces all devices to regulate to the same output voltage and share load current proportionally. This method requires no external current-sense resistors or amplifiers and maintains stability across temperature and unit-to-unit variations. The LTC3630AHMSE#TRPBF's FBO sink impedance (70Ω) and pull-up current (20µA) are optimized for reliable multi-unit synchronization.
Can the LTC3630AHMSE#TRPBF operate with 100% duty cycle, and what are the implications?
Yes, the LTC3630AHMSE#TRPBF supports true 100% duty-cycle operation due to its P-channel high-side MOSFET, allowing continuous conduction when VIN approaches VOUT - critical for automotive cold-crank scenarios where input may drop to 3.5V. During dropout, power dissipation increases significantly because the top switch operates in linear region; thermal design must account for worst-case power loss (e.g., at VIN = 5V, VOUT = 3.3V, 500mA). The LTC3630AHMSE#TRPBF's 150°C rating and exposed-pad MSOP package mitigate this risk when properly mounted.
What is the role of the ISET pin on the LTC3630AHMSE#TRPBF, and how does it affect design?
The ISET pin on the LTC3630AHMSE#TRPBF sets the peak inductor current limit via an external resistor to ground, directly controlling maximum average output current (½ × peak). A floating ISET yields 1.2A peak (600mA max avg), while grounding it gives 0.12A peak (60mA avg). This adjustment optimizes inductor and capacitor sizing: lower ISET reduces component volume and light-load ripple but trades off transient response. The LTC3630AHMSE#TRPBF's ISET current drops from 5µA to 1µA in sleep mode, enabling ripple filtering without sacrificing efficiency - a unique feature among high-voltage buck converters.
Does the LTC3630AHMSE#TRPBF require external compensation components?
No, the LTC3630AHMSE#TRPBF uses a proprietary hysteretic Burst Mode® control architecture that requires no external compensation components - unlike voltage-mode or current-mode controllers. Its stability is inherent to the comparator-based feedback loop and peak-current sensing, eliminating the need for type-II or type-III compensation networks. This simplifies layout, reduces BOM count, and improves reliability across temperature and input/output variations. All necessary compensation is implemented internally, confirmed in the LTC3630AHMSE#TRPBF's functional block diagram and application schematics.
LTC3630AHMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 0.8V (1.8V, 3.3V, 5V)
- Voltage - Output (Max):
- 76V
- Current - Output:
- 500mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3630AHMSE#TRPBF FAQ
1.How can I place an order for LTC3630AHMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AHMSE#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 LTC3630AHMSE#TRPBF reliable?
The price and inventory of LTC3630AHMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AHMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3630AHMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AHMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AHMSE#TRPBF?
LTC3630AHMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AHMSE#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 LTC3630AHMSE#TRPBF?
For technical support, including LTC3630AHMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AHMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3630AHMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AHMSE#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 LTC3630AHMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3630AHMSE#TRPBF?
All LTC3630AHMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AHMSE#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 LTC3630AHMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3630AHMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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