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Analog Devices Inc. LTC3630AIMSE#PBF
- Part No.:
- LTC3630AIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3630AIMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
LTC3630AIMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V–76V input, 500mA synchronous step-down DC/DC converter with integrated high-side P-channel and low-side N-channel MOSFETs, 12µA no-load quiescent current, and programmable peak current limit (100mA–1.2A). It operates in Burst Mode® for ultra-low power standby and supports adjustable or fixed 1.8V/3.3V/5V outputs - ideal for industrial control supplies and automotive subsystems requiring wide-input regulation.
For engineers reviewing the LTC3630AIMSE#PBF datasheet, LTC3630AIMSE#PBF pinout, LTC3630AIMSE#PBF application, or LTC3630AIMSE#PBF equivalent, key selection considerations include its 76V max VIN rating, 0.8V ±1% feedback reference, 100% duty-cycle dropout capability, thermally enhanced MSE16 package with exposed GND pad, and FBO pin for current sharing across multiple units.
Technical Context
The LTC3630AIMSE#PBF implements a hysteretic Burst Mode® control architecture with internal feedback comparator (0.8V threshold), reverse current detection, and peak current limiting via ISET pin voltage programming. Its P-channel high-side switch enables true 100% duty-cycle operation during dropout, while the N-channel synchronous rectifier eliminates external diode losses.
It integrates RUN pin undervoltage lockout (1.21V enable threshold, 110mV hysteresis), internal soft-start (0.8ms default), and FBO output for master-slave paralleling - all without requiring external compensation components. The device maintains regulation down to 0.8V output and tolerates input transients up to 80V absolute maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports wide-input industrial, automotive, and avionics rails without pre-regulation |
| Max Output Current | 500mA average - limited by 1.2A typical peak current (IPEAK = 2 × IOUT(AVG)) |
| Quiescent Current | 12µA in Burst Mode sleep - enables multi-year battery life in always-on sensor nodes |
| Feedback Reference | 0.800V ±1% - sets precise output voltage with external resistor divider or enables fixed 1.8V/3.3V/5V via VPRG pins |
| Switching Architecture | Synchronous buck with integrated P-ch high-side + N-ch low-side MOSFETs - eliminates external diode, improves efficiency >90% at mid-load |
| Package Thermal Resistance | θJA = 45°C/W (MSE16) - requires exposed pad soldered to PCB ground plane for safe 125°C junction operation |
| Operating Junction Temp | –40°C to +125°C - qualified for extended industrial temperature range per part marking "I" grade |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.1mm body, 0.75mm profile, exposed thermal pad (Pin 17, GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection to inductor; ties drains of internal high-side P-MOSFET and low-side N-MOSFET |
| VIN (3) | Main input supply | Accepts 4V–76V; requires local ceramic bypass capacitor to GND for stability |
| RUN (5) | Enable/UVLO control | 1.21V rising threshold enables operation; 0.7V falling forces 5µA shutdown; supports resistor-divider UVLO setting |
| VPRG1 (6), VPRG2 (7) | Output voltage selection | Configures fixed 1.8V/3.3V/5V or adjustable mode (both grounded); no external resistors needed for standard outputs |
| GND (8,14,16,17) | Ground reference & thermal path | Pins 8/14/16 are signal GND; Pin 17 is exposed pad - must be soldered to PCB ground plane for thermal performance |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; directly connected to output in fixed-voltage mode |
| SS (10) | Soft-start timing | Capacitor to GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms internal soft-start |
| ISET (11) | Peak current programming | Resistor to GND sets IPEAK (100mA–1.2A); open = max, shorted = min; also filters light-load ripple when capacitor added |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) for paralleling multiple LTC3630As in higher-current applications |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at ultra-light loads with only 12µA supply current - critical for energy-harvesting and battery-backed systems |
| Integrated power switches | Eliminates external MOSFETs and gate drivers; reduces BOM count and layout complexity while enabling 92% peak efficiency |
| Programmable peak current limit | Adjusts IPEAK from 100mA to 1.2A via single resistor on ISET pin - optimizes inductor/capacitor size and light-load ripple trade-offs |
| 100% duty-cycle dropout | P-channel high-side switch sustains regulation as VIN approaches VOUT - essential for brownout resilience in automotive start-stop systems |
| Multi-unit current sharing | FBO pin allows master-slave configuration of ≥2 LTC3630As - scales output current beyond 500mA without external current-sense circuitry |
Applications
| Industrial Control Supplies | Automotive Subsystems |
|---|---|
Use Scenario: Powering PLC I/O modules, field transmitters, and isolated sensor interfaces from unregulated 24V or 48V DC rails. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator delivering stable 3.3V or 5V to microcontrollers and analog front-ends. Use Value: 76V max input withstands load-dump transients; 12µA quiescent current extends backup battery life during mains failure. |
Use Scenario: Supplying infotainment head units, ADAS camera modules, and body control modules from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Point-of-load regulator converting battery voltage to 5V/3.3V for SoCs and peripherals. Use Value: 100% duty-cycle operation maintains output during cranking (VIN ≈ 6V); RUN pin UVLO prevents erratic behavior below 3.5V. |
| Avionics Power Distribution | Medical Portable Instruments |
Use Scenario: Regulating 28V aircraft bus to 5V for flight data recorders, communication radios, and navigation sensors. IC Role / Device Role / Timing Role: High-reliability primary converter with fault-tolerant design and thermal shutdown. Use Value: 150°C max junction rating and robust 80V abs-max input support MIL-STD-704 transient compliance. |
Use Scenario: Powering handheld ultrasound devices, glucose meters, and portable ECG monitors from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling long runtime and low self-heating in compact enclosures. Use Value: Burst Mode® extends battery life >10× vs continuous switching; MSE16 package fits tight space constraints. |
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 |
|---|---|---|---|
| LT8609S | 42V max VIN, 2A output, 2.5µA quiescent current, requires external compensation | Higher current, lower IQ, but narrower input range and no integrated FBO current sharing | Choose LT8609S for higher output current and ultra-low IQ where input <42V and paralleling not required |
| TPS54360B | 60V max VIN, 3.5A output, 14µA IQ, adjustable frequency, requires external MOSFETs | Higher current and frequency flexibility, but discrete power stage increases BOM and layout effort | Choose TPS54360B when >500mA is needed and design can accommodate external FETs and compensation network |
Compared with LT8609S and TPS54360B, the LTC3630AIMSE#PBF uniquely combines 76V input tolerance, integrated current-sharing capability via FBO, and guaranteed 125°C operation in a compact MSE16 package - making it optimal for space-constrained, wide-input industrial and transportation systems where reliability and simplicity are prioritized over raw current capacity.
Availability
LTC3630AIMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, automotive subsystems, and avionics power distribution requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3630AIMSE#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3630A belongs to Linear's high-voltage monolithic DC/DC converter family, designed specifically for rugged industrial, automotive, and aerospace applications demanding wide-input operation, low quiescent current, and integrated power stages.
FAQ
What is the maximum input voltage rating for the LTC3630AIMSE#PBF?
The LTC3630AIMSE#PBF has a maximum operating input voltage of 76V and an absolute maximum rating of 80V. This allows direct connection to 48V industrial buses, 28V avionics systems, and automotive 12V/24V rails with load-dump protection margin. Operation above 76V is not recommended for sustained use, though the device will survive brief 80V transients per Absolute Maximum Ratings.
How does the ISET pin configure peak current limit on the LTC3630AIMSE#PBF?
The ISET pin on the LTC3630AIMSE#PBF sources a 5µA (1µA in sleep mode) current that develops a voltage across an external resistor to ground, setting the peak inductor current threshold between 100mA and 1.2A. For example, a 100kΩ resistor yields ~0.5V at ISET and programs ~500mA peak current. The maximum average output current is half the programmed peak value, so 500mA peak supports 250mA continuous output.
Can the LTC3630AIMSE#PBF operate with 100% duty cycle, and under what conditions?
Yes, the LTC3630AIMSE#PBF supports 100% duty cycle operation due to its P-channel high-side MOSFET. This occurs when VIN drops near VOUT (e.g., 6V input to 5V output), allowing uninterrupted conduction to maintain regulation during brownout or cold-crank events. During 100% duty cycle, output current is limited by peak current setting and thermal limits - power dissipation rises significantly below 10V input.
What is the function of the FBO pin on the LTC3630AIMSE#PBF, and how is it used?
The FBO (Feedback Comparator Output) pin on the LTC3630AIMSE#PBF is an open-drain output that signals when the internal feedback comparator trips. Connecting the FBO of a "master" LTC3630AIMSE#PBF to the VFB pins of "slave" units forces all devices to regulate identically and share load current proportionally - enabling scalable output beyond 500mA without external current-sense amplifiers or complex control logic.
Does the LTC3630AIMSE#PBF require external compensation components?
No, the LTC3630AIMSE#PBF uses a hysteretic Burst Mode® control architecture that requires no external compensation components. Its internal feedback loop is inherently stable across all operating conditions and output capacitor types (including low-ESR ceramics), simplifying design and reducing bill-of-materials cost compared to voltage-mode or current-mode controllers needing RC networks.
LTC3630AIMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3630AIMSE#PBF FAQ
1.How can I place an order for LTC3630AIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AIMSE#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 LTC3630AIMSE#PBF reliable?
The price and inventory of LTC3630AIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630AIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AIMSE#PBF?
LTC3630AIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AIMSE#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 LTC3630AIMSE#PBF?
For technical support, including LTC3630AIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AIMSE#PBF requirements.
6.How does Aetrix verify that LTC3630AIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AIMSE#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 LTC3630AIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630AIMSE#PBF?
All LTC3630AIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AIMSE#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 LTC3630AIMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3630AIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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