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Analog Devices Inc. LTC3630AEDHC#PBF
- Part No.:
- LTC3630AEDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630AEDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:417
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Product details
Overview
LTC3630AEDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous step-down DC/DC converter with integrated high-side P-channel and low-side N-channel MOSFETs. It operates from 4V to 76V input, delivers up to 500mA output current, maintains regulation down to 0.8V output, and draws only 12µA quiescent current in Burst Mode® at no load - ideal for industrial control supplies and automotive subsystems requiring wide-input, low-power standby operation.
For engineers reviewing the LTC3630AEDHC#PBF datasheet, LTC3630AEDHC#PBF pinout, LTC3630AEDHC#PBF application, or LTC3630AEDHC#PBF equivalent, key selection criteria include its programmable peak current limit (100mA–1.2A), 0.8V ±1% feedback reference, 100% duty-cycle dropout capability, and compatibility with parallel operation via FBO pin for higher-current designs.
Technical Context
The LTC3630AEDHC#PBF uses Burst Mode® control with hysteretic feedback to achieve ultra-low quiescent current across load ranges. Its internal power switches - a 1.0Ω high-side P-MOSFET and 0.53Ω low-side N-MOSFET - enable synchronous rectification without external diodes or compensation components.
Operation relies on dual voltage references: a precise 0.8V adjustable feedback threshold and fixed-output thresholds (1.8V/3.3V/5V) selected via VPRG1/VPRG2 pins. The RUN pin provides accurate undervoltage lockout (1.21V rising, 1.10V falling), while ISET pin programming sets peak inductor current, directly determining maximum average output current (IOUT(MAX) = 0.5 × IPEAK).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct connection to 24V, 48V, and 72V industrial or automotive battery rails without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables generation of sub-1V core supplies or high-VOUT bias rails; fixed options: 1.8V/3.3V/5V via VPRG pins. |
| Max Output Current | 500mA - determined by 1.2A typical peak current limit; programmable down to 100mA peak (50mA avg) for low-power applications. |
| Quiescent Current | 12µA typical in Burst Mode® - sustains regulated output at no load with minimal battery drain in always-on systems. |
| Feedback Reference | 0.800V ±1% - enables accurate output regulation with standard resistor dividers; fixed outputs use internal precision resistors. |
| Package Thermal Resistance | θJA = 43°C/W (DFN) - requires exposed pad soldering to PCB ground plane for thermal performance in continuous 500mA operation. |
| Shutdown Current | 5µA - achieved when RUN pin < 0.7V; enables deep system-level power gating. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal management (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point between internal high-side and low-side MOSFETs; ties to inductor; carries high dv/dt switching waveform. |
| VIN (3) | Main input supply | Accepts 4V–76V input; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| RUN (5) | Enable/control input | 1.21V rising threshold enables operation; 0.7V falling forces shutdown; supports resistor-divider UVLO configuration. |
| VPRG1 / VPRG2 (6,7) | Output voltage select | Configure fixed outputs: both grounded = adjustable; VPRG1=SS/VPRG2=GND = 5V; VPRG1=GND/VPRG2=SS = 3.3V; both=SS = 1.8V. |
| GND (8,14,16,17) | Ground reference | Multiple ground connections including exposed thermal pad (Pin 17); all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output voltage against 0.8V reference; short to VOUT for fixed-output mode; connects to divider for adjustable mode. |
| SS (10) | Soft-start control | Capacitor to GND sets output ramp time (1ms per 16.5nF); floating defaults to 0.8ms internal soft-start. |
| ISET (11) | Peak current programming | Resistor to GND sets peak inductor current (100mA–1.2A); open = max, shorted = min; determines max output current and ripple trade-off. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) used to parallel multiple LTC3630As by connecting to slave VFB pins. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal type-II compensation eliminates need for external RC network - reduces BOM count and layout sensitivity. |
| Programmable peak current limit | Adjustable from 100mA to 1.2A via ISET resistor - optimizes inductor/capacitor sizing and balances light-load efficiency vs. output ripple. |
| 100% duty-cycle low-dropout operation | P-channel high-side switch enables full conduction at VIN ≈ VOUT - maintains regulation during brownout or battery sag conditions. |
| Parallel-ready architecture | FBO pin allows master-slave current sharing across multiple LTC3630As - scales output current beyond 500mA without external current-sense circuitry. |
| Thermally enhanced DFN package | 5mm × 3mm footprint with exposed GND pad achieves θJA = 43°C/W - supports 500mA continuous operation with minimal board area. |
Applications
| Industrial Control Supplies | Automotive Subsystems |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor transmitters, and fieldbus interface circuits in 24V/48V rail environments with strict standby power budgets. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3V or 5V from unregulated industrial bus, operating continuously in Burst Mode®. Use Value: 12µA quiescent current extends battery backup runtime; 76V max input tolerates load-dump transients; programmable IPEAK minimizes component size for space-constrained DIN-rail enclosures. |
Use Scenario: Supplying infotainment display logic, ADAS camera modules, or body-control unit microcontrollers from 12V battery with cold-crank resilience. IC Role / Device Role / Timing Role: High-input buck converter providing 1.8V core voltage for SoCs, enabling operation down to 4V during cranking. Use Value: 100% duty-cycle dropout ensures uninterrupted power during engine start; 76V absolute max rating withstands ISO 7637-2 pulse 5a; fixed 1.8V output eliminates external feedback resistors. |
| Medical Portable Instruments | Avionics Power Management |
Use Scenario: Battery-powered handheld diagnostics devices requiring long shelf life and reliable wake-up from ultra-low-power sleep states. IC Role / Device Role / Timing Role: Primary DC/DC regulator powering MCU, ADC, and wireless transceiver; enabled via RUN pin controlled by system supervisor. Use Value: 5µA shutdown current preserves battery charge during storage; precise RUN threshold enables programmable brownout recovery; low EMI Burst Mode® avoids RF interference with sensitive analog front-ends. |
Use Scenario: Distributed power conversion in line-replaceable units (LRUs) where input may range from 28V aircraft bus to transient-surged 40V+ sources. IC Role / Device Role / Timing Role: Robust primary buck stage converting 28V nominal to 5V for avionics processors, with parallel capability for redundancy or higher current. Use Value: 80V absolute max VIN rating exceeds DO-160 Section 22 surge requirements; FBO-based paralleling supports fault-tolerant design; -40°C to 125°C operation meets RTCA DO-160 environmental specs. |
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 |
|---|---|---|---|
| LTC3630IMSE#PBF | Same electrical specs but in 16-lead MSOP package (θJA = 45°C/W); no NC pins; slightly larger footprint (4mm × 3mm vs. 5mm × 3mm DFN). | Preferred where creepage/clearance > 0.2mm is required at high VIN; better suited for manual assembly or prototyping due to gull-wing leads. | Select when board layout constraints favor MSOP or high-voltage isolation is critical; not drop-in compatible with DFN land pattern. |
| LT8609SIS8#PBF | 42V max VIN, 2.5A output, 2.5µA IQ, Silent Switcher® architecture; different pinout, no FBO, no programmable IPEAK. | Better EMI performance and higher current, but lacks 76V input and parallel capability; requires external compensation. | Choose for noise-sensitive applications (e.g., RF modules) where 42V input suffices and higher output current is needed; not suitable for 72V battery or paralleling use cases. |
Compared with LTC3630IMSE#PBF, the LTC3630AEDHC#PBF offers superior thermal performance (43°C/W vs. 45°C/W) in a smaller footprint but requires careful DFN reflow; versus LT8609SIS8#PBF, it trades EMI reduction for wider input range, programmability, and multi-unit scaling - making it uniquely suited for high-VIN industrial and transportation systems.
Availability
LTC3630AEDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, automotive subsystems, and medical portable instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3630AEDHC#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, datasheets, and application engineering for the LTC portfolio.
The LTC3630A belongs to Linear's high-voltage monolithic buck converter family, designed specifically for ruggedized power conversion in industrial, automotive, and aerospace applications where wide input range, low quiescent current, and reliability under transient stress are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3630AEDHC#PBF?
The LTC3630AEDHC#PBF has an absolute maximum input voltage rating of 80V and a recommended operating range of 4V to 76V. Operation above 76V is not guaranteed and risks permanent damage. The device is rated for continuous operation at 76V input, making it suitable for 48V and 72V battery systems with margin for transients.
How does the ISET pin affect output current capability in the LTC3630AEDHC#PBF?
The ISET pin on the LTC3630AEDHC#PBF programs the peak inductor current from 100mA to 1.2A using an external resistor to GND. Since the maximum average output current equals half the peak current, setting ISET for 1.2A peak yields up to 500mA output; setting it for 200mA peak limits output to 100mA - enabling optimization of efficiency, ripple, and component size.
Can the LTC3630AEDHC#PBF operate with 100% duty cycle, and what is the practical implication?
Yes, the LTC3630AEDHC#PBF supports 100% duty cycle via its P-channel high-side MOSFET, allowing regulation when VIN approaches VOUT. This enables operation during battery brownout or input sag. However, power dissipation increases significantly below ~10V input due to higher RDS(ON) and elevated output current - thermal design must account for this condition.
What is the purpose of the FBO pin on the LTC3630AEDHC#PBF, and how is it used?
The FBO (Feedback Comparator Output) pin on the LTC3630AEDHC#PBF is an open-drain output that signals when the internal feedback comparator trips. It is used to parallel multiple LTC3630AEDHC#PBF units: the FBO of a master device connects to the VFB pins of slave devices, forcing them to regulate in phase and share load current proportionally - enabling >500mA total output without external current sensing.
Does the LTC3630AEDHC#PBF require external compensation components?
No, the LTC3630AEDHC#PBF uses internal type-II compensation and requires no external capacitors or resistors for loop stability. This simplifies design, reduces BOM cost, and eliminates layout sensitivity associated with compensation networks - a key advantage over many competing controllers that mandate external compensation.
LTC3630AEDHC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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-DFN (5x3)
LTC3630AEDHC#PBF FAQ
1.How can I place an order for LTC3630AEDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AEDHC#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 LTC3630AEDHC#PBF reliable?
The price and inventory of LTC3630AEDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AEDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630AEDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AEDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AEDHC#PBF?
LTC3630AEDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AEDHC#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 LTC3630AEDHC#PBF?
For technical support, including LTC3630AEDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AEDHC#PBF requirements.
6.How does Aetrix verify that LTC3630AEDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AEDHC#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 LTC3630AEDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630AEDHC#PBF?
All LTC3630AEDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AEDHC#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 LTC3630AEDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630AEDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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