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Analog Devices Inc. LTC3630AHDHC#PBF
- Part No.:
- LTC3630AHDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630AHDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
LTC3630AHDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V–76V input, synchronous step-down DC/DC converter with integrated high-side P-channel and low-side N-channel MOSFETs, delivering up to 500mA output current, featuring 12µA no-load quiescent current and programmable peak current limit (0.09A–1.4A). It operates in Burst Mode® for ultra-low power consumption and supports adjustable or fixed 1.8V/3.3V/5V outputs - ideal for industrial control supplies and automotive subsystems requiring wide VIN tolerance and thermal robustness.
For engineers reviewing the LTC3630AHDHC#PBF datasheet, LTC3630AHDHC#PBF pinout, LTC3630AHDHC#PBF application, or LTC3630AHDHC#PBF equivalent, key selection criteria include its –40°C to 150°C operating junction temperature range, 16-lead 5mm × 3mm DFN package with exposed GND pad, 0.8V ±1% feedback reference, and FBO-enabled parallel operation for higher current scalability.
Technical Context
The LTC3630AHDHC#PBF implements a hysteretic Burst Mode® control architecture with internal peak current limiting and feedback comparator-based regulation. Its dual-MOSFET synchronous topology eliminates external diode losses, while the 100% duty cycle dropout capability enables stable operation down to VIN ≈ VOUT. The RUN pin provides precise undervoltage lockout (1.21V enable threshold, 110mV hysteresis), and the FBO pin allows master-slave paralleling via feedback comparator output sharing.
Pin-level functions include ISET for resistor-programmable peak current (via 5µA current source), SS for soft-start timing (0.8ms internal or capacitor-adjustable), and VPRG1/VPRG2 for fixed-output selection without external resistors. The device integrates reverse-current protection, overtemperature shutdown (~180°C), and 0.75mm profile DFN packaging optimized for high-voltage industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct connection to unregulated 24V/48V industrial rails and automotive battery transients. |
| Output Current | Up to 500mA average - limited by 1.2A typical peak current (IPEAK = 2 × IOUT), programmable via ISET resistor. |
| Quiescent Current | 12µA in Burst Mode sleep - enables multi-year battery life in always-on remote sensors and IoT nodes. |
| Feedback Reference | 0.800V ±1% - sets output voltage accuracy in adjustable mode; enables 1.8V/3.3V/5V fixed outputs via VPRG pins. |
| Package | 16-lead 5mm × 3mm DFN (DHC) with exposed GND pad - θJA = 43°C/W, requires PCB thermal pad for 150°C operation. |
| Operating Temp | –40°C to 150°C junction - qualified for under-hood automotive, avionics, and high-ambient industrial environments. |
| Switching Topology | Synchronous buck with integrated P-ch high-side and N-ch low-side MOSFETs - eliminates external Schottky loss and improves light-load efficiency. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm), 0.75mm height, exposed GND pad (Pin 17) - must be soldered to PCB ground plane for thermal compliance at 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries full switching current; requires low-inductance layout to minimize EMI and shoot-through risk. |
| VIN (3) | Main input supply | Accepts 4V–76V; requires local 10µF+ ceramic bypass to GND for stability and transient suppression. |
| RUN (5) | Enable/UVLO control | 1.21V rising threshold enables operation; 0.7V falling forces 5µA shutdown; supports precision input monitoring via resistor divider. |
| VPRG1/VPRG2 (6,7) | Output voltage programming | Select 1.8V/3.3V/5V fixed or adjustable mode; eliminate external feedback resistors in standard configurations. |
| GND (8,14,16,17) | Ground reference & thermal path | Multiple GND pins + exposed pad ensure low-impedance return and heat dissipation; pad must be soldered. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; connects directly to VOUT in fixed mode; to resistor divider in adjustable mode. |
| SS (10) | Soft-start control | Capacitor to GND sets ramp time (1ms per 16.5nF); prevents input droop during startup; internal default is 0.8ms. |
| ISET (11) | Peak current programming | Resistor to GND sets IPEAK (0.09A–1.4A); determines max output current, ripple, and component sizing. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) enables paralleling multiple LTC3630As for >500mA total current. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads while drawing only 12µA, enabling energy harvesting and battery-powered longevity. |
| Integrated power switches | Eliminates external MOSFETs and gate drivers - reduces BOM count, layout area, and design validation effort. |
| Programmable peak current limit | Adjusts IPEAK from 0.09A to 1.4A via single ISET resistor - optimizes inductor/capacitor size and light-load ripple trade-offs. |
| Fixed-output voltage options | 1.8V/3.3V/5V selectable via VPRG pins - removes feedback resistors and associated noise sensitivity in standard applications. |
| Parallel operation support | FBO pin enables master-slave configuration - scales output current beyond 500mA without external current-sharing circuitry. |
Applications
| Industrial Control Supplies | Automotive Subsystems |
|---|---|
Use Scenario: Powering PLC I/O modules, field transmitters, and isolated sensor interfaces in factory automation cabinets with 24V or 48V backplanes. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator converting unregulated rail to stable 3.3V or 5V for microcontrollers and analog front-ends. Use Value: 76V absolute max rating withstands 48V rail surges; 150°C rating ensures reliability in enclosed, high-ambient enclosures. | Use Scenario: Supplying infotainment head units, ADAS camera modules, and body control ECUs from vehicle battery (9V–16V nominal, up to 60V load dump). IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering regulated 5V to USB peripherals or 1.8V to image signal processors. Use Value: 12µA quiescent current meets automotive "parking mode" requirements; RUN pin enables precise battery monitoring and wake-up control. |
| Avionics Power Conditioning | Medical Portable Instruments |
Use Scenario: Regulating 28V aircraft bus to 5V/3.3V for flight data recorders, cockpit displays, and communication radios in space-constrained avionics bays. IC Role / Device Role / Timing Role: Primary point-of-load converter with high-reliability thermal performance and input surge resilience. Use Value: DFN package's low profile fits tight form factors; 150°C rating accommodates conduction-cooled chassis mounting. | Use Scenario: Powering handheld ultrasound probes, glucose meters, and portable ECG monitors using primary lithium batteries (3.0V–4.2V) or rechargeable packs. IC Role / Device Role / Timing Role: Efficient step-down regulator extending battery runtime while maintaining stable voltage across discharge curve. Use Value: Burst Mode® extends battery life >3× vs continuous PWM; programmable IPEAK minimizes inductor size for portability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8#PBF | 42V max VIN, 2.5A output, 2.5µA IQ, Silent Switcher® architecture - lower IQ but narrower input range and no FBO paralleling. | Preferred for noise-sensitive medical imaging or RF systems where EMI is critical; unsuitable for >42V inputs or >500mA parallel scaling. | Select LT8609S when ultra-low EMI and sub-3µA IQ outweigh need for 76V operation or multi-unit current stacking. |
| TPS54360BDRCT | 60V max VIN, 3.5A output, 14µA IQ, external MOSFETs - higher current but requires external FETs, more components, and no integrated FBO. | Better for cost-sensitive, high-current (>1A) designs where board space permits discrete FETs and layout complexity is acceptable. | Choose TPS54360B when >500mA is required and external MOSFET flexibility justifies added design effort and BOM count. |
Compared with LT8609SIS8#PBF and TPS54360BDRCT, the LTC3630AHDHC#PBF uniquely combines 76V input tolerance, integrated FBO paralleling, and 150°C operation - making it the only option among the three qualified for high-temp industrial and under-hood automotive use with scalable current delivery.
Availability
LTC3630AHDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, automotive subsystems, avionics power conditioning, and medical portable instruments requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LTC3630AHDHC#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3630A belongs to ADI's high-voltage monolithic DC/DC converter product line, designed specifically for ruggedized industrial, automotive, and aerospace applications demanding wide input range, low quiescent current, and extended temperature operation.
FAQ
What is the maximum input voltage rating for the LTC3630AHDHC#PBF?
The LTC3630AHDHC#PBF has an absolute maximum input voltage rating of 80V and a specified operating input voltage range of 4V to 76V. This allows reliable operation across harsh industrial and automotive supply rails, including 48V systems with transient spikes. Operation above 76V is not guaranteed and may trigger overvoltage protection or cause permanent damage.
How does the ISET pin on the LTC3630AHDHC#PBF control output current?
The ISET pin on the LTC3630AHDHC#PBF sources a 5µA current (reduced to 1µA in sleep mode) that develops a voltage across an external resistor to ground, setting the peak inductor current threshold. Since maximum average output current equals half the peak current, a 100kΩ resistor yields ~500mA output capability. The LTC3630AHDHC#PBF's ISET programming directly determines inductor size, output ripple, and light-load efficiency trade-offs.
Can multiple LTC3630AHDHC#PBF ICs be connected in parallel to increase output current?
Yes - the LTC3630AHDHC#PBF includes a dedicated FBO (Feedback Comparator Output) pin that enables seamless current sharing. By connecting the FBO pin of one "master" LTC3630AHDHC#PBF to the VFB pins of one or more "slave" units, the devices synchronize regulation and share load current proportionally. This method avoids external current-sense amplifiers or complex control loops.
What is the purpose of the exposed pad (Pin 17) on the LTC3630AHDHC#PBF DFN package?
The exposed pad (Pin 17) on the LTC3630AHDHC#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA of 43°C/W and sustain continuous operation at the full –40°C to 150°C junction temperature range. Omitting this connection risks thermal runaway and premature failure under load.
Does the LTC3630AHDHC#PBF support fixed-output voltages without external resistors?
Yes - the LTC3630AHDHC#PBF supports factory-configurable fixed outputs of 1.8V, 3.3V, or 5V using only the VPRG1 and VPRG2 pins. Shorting these pins to GND, SS, or combinations thereof selects the desired output without external feedback resistors, reducing component count, noise susceptibility, and board area - a key advantage over generic adjustable buck controllers.
LTC3630AHDHC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3630AHDHC#PBF FAQ
1.How can I place an order for LTC3630AHDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AHDHC#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 LTC3630AHDHC#PBF reliable?
The price and inventory of LTC3630AHDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AHDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630AHDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AHDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AHDHC#PBF?
LTC3630AHDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AHDHC#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 LTC3630AHDHC#PBF?
For technical support, including LTC3630AHDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AHDHC#PBF requirements.
6.How does Aetrix verify that LTC3630AHDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AHDHC#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 LTC3630AHDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630AHDHC#PBF?
All LTC3630AHDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AHDHC#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 LTC3630AHDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630AHDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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