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Analog Devices Inc. LTC3630AIDHC#PBF
- Part No.:
- LTC3630AIDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630AIDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:285
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Product details
Overview
LTC3630AIDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input synchronous step-down DC/DC converter with integrated high-side and low-side MOSFETs, 4V–76V input range, 500mA output capability, and 12µA no-load quiescent current-designed for industrial control supplies, medical devices, and automotive power rails where ultra-low standby power and high-voltage resilience are critical.
For engineers reviewing the LTC3630AIDHC#PBF datasheet, LTC3630AIDHC#PBF pinout, LTC3630AIDHC#PBF application, or LTC3630AIDHC#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed package mapping to the 16-lead 5mm × 3mm DFN, and two rigorously cross-checked alternative parts for fixed-output or programmable-current designs.
Technical Context
The LTC3630AIDHC#PBF implements Burst Mode® operation with hysteretic feedback control, enabling 12µA sleep-mode supply current while maintaining regulation. Its internal P-channel high-side and N-channel low-side MOSFETs eliminate external switch losses and simplify layout.
Peak inductor current is programmable via ISET pin (0.09A–1.2A typical), directly setting maximum average output current (up to 500mA). The device supports 0.8V–VIN adjustable output or factory-programmed 1.8V/3.3V/5V fixed outputs using VPRG1/VPRG2 pins-no external resistors required for standard voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - enables direct regulation from 24V/48V industrial buses, 60V automotive transients, or PoE+ injectors without pre-regulation. |
| Max Output Current | 500mA - determined by 1.2A peak current limit and synchronous architecture; sufficient for powering microcontrollers, sensors, and interface ICs. |
| No-Load Quiescent Current | 12µA - achieved via Burst Mode® and internal gate drive optimization; extends battery life in always-on systems. |
| Feedback Reference Voltage | 0.800V ±1% - precise internal reference enables stable 1.8V/3.3V/5V outputs or accurate adjustable regulation down to 0.8V. |
| Package | 16-lead 5mm × 3mm DFN (DHC) with exposed thermal pad - θJA = 43°C/W; requires soldered GND pad for thermal reliability at full load. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments per AEC-Q200-relevant stress profiles. |
| Switch On-Resistance | Top: 1.00Ω, Bottom: 0.53Ω - measured at ISW = ±200mA; defines conduction loss budget and thermal rise at 500mA output. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm), thermally enhanced with exposed GND pad (Pin 17). Requires PCB land pattern per Linear/LT AN137 for optimal thermal performance and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor; carries pulsed high-current waveform; must be routed with minimal loop area to reduce EMI. |
| VIN (3) | Main Input Supply | High-voltage input rail (4V–76V); requires local 10µF ceramic bypass capacitor to GND for stability. |
| RUN (5) | Enable/UVLO Control | 1.21V rising threshold enables operation; 110mV hysteresis prevents chatter during brownout; supports resistor-divider UVLO programming. |
| VPRG1 (6), VPRG2 (7) | Output Voltage Selection | Configures fixed 1.8V/3.3V/5V or adjustable mode; eliminates external feedback resistors for standard outputs. |
| GND (8,14,16,17) | Ground Return | Multiple GND pins and exposed thermal pad (Pin 17) must be soldered to solid PCB ground plane for thermal and noise integrity. |
| VFB (9) | Feedback Input | Monitors divided output voltage; compares to 0.8V reference; connects directly to VOUT for fixed outputs or to divider for adjustable mode. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets output ramp time (1ms per 16.5nF); internal 0.8ms default if floating; prevents input droop during startup. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak current (0.09A–1.2A); determines max output current and influences component size/ripple trade-offs. |
| 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 | Reduces no-load IQ to 12µA while maintaining regulation-critical for battery-backed or energy-harvesting systems. |
| Integrated Power Switches | Eliminates external MOSFETs and gate drivers; reduces BOM count, layout area, and design risk for 500mA applications. |
| Programmable Peak Current Limit | Adjusts max output current from 100mA to 500mA via single ISET resistor-enables optimized efficiency and ripple across load ranges. |
| 100% Duty Cycle Dropout | P-channel high-side switch sustains regulation down to VIN ≈ VOUT-supports wide input transients without output collapse. |
| Fixed-Output Voltage Options | 1.8V/3.3V/5V selectable via VPRG pins-removes feedback resistor tolerance errors and noise sensitivity in space-constrained layouts. |
Applications
| Industrial Control Supplies | Medical Instrumentation |
|---|---|
Use Scenario: Powering PLC I/O modules, fieldbus transceivers, and isolated sensor interfaces from unregulated 24V/48V rails with strict standby power limits. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3V or 5V to MCU, ADC, and communication ICs. Use Value: 12µA quiescent current extends uptime in battery-buffered controllers; 76V input withstands industrial surge events per IEC 61000-4-5. |
Use Scenario: Providing clean, low-noise 5V and 3.3V rails for portable ultrasound probes, patient monitors, and infusion pump controllers. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V battery or adapter input to regulated logic and analog supply domains. Use Value: Burst Mode® minimizes heat generation near sensitive analog circuitry; fixed-output modes eliminate resistor drift-induced calibration errors. |
| Automotive Body Electronics | Avionics Power Management |
Use Scenario: Regulating 12V/24V vehicle battery to 5V for infotainment USB hubs, lighting controllers, and CAN transceivers in start-stop environments. IC Role / Device Role / Timing Role: High-voltage buck converter handling cold-crank (4.5V) to load-dump (76V) transients without external protection. Use Value: Integrated UVLO and RUN pin programmability enable precise battery monitoring; 125°C rating supports under-hood placement. |
Use Scenario: Generating 3.3V and 5V from 28V aircraft bus for flight data recorders, cockpit displays, and navigation sensors requiring high reliability. IC Role / Device Role / Timing Role: Primary DC/DC stage in redundant power architecture, often paralleled via FBO for fault-tolerant current delivery. Use Value: FBO pin enables seamless current sharing between LTC3630As without master-slave timing skew; exposed pad ensures thermal margin at altitude. |
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 |
|---|---|---|---|
| LTC3631EDHC#PBF | Higher 1A output current, same 4V–76V input, but 25µA no-load IQ and no FBO pin. | Preferred when >500mA is needed and current sharing is not required; less suitable for ultra-low-power always-on systems. | Select for higher output current without paralleling; avoid if <15µA IQ or FBO-based redundancy is mandatory. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 4.5V–65V input, 500mA, 13µA IQ, but requires external MOSFETs and compensation network. | Used where automotive qualification and external switch flexibility are prioritized over integration and ease of use. | Choose for AEC-Q100 compliance and design flexibility; reject if minimizing external components or achieving <15µA IQ is essential. |
Compared with LTC3630AIDHC#PBF, LTC3631EDHC#PBF trades lower quiescent current and current-sharing capability for higher output current, while LM5164QDDARQ1 sacrifices integration and ultra-low IQ for automotive qualification and external switch control-making LTC3630AIDHC#PBF optimal for space-constrained, low-IQ industrial and medical applications requiring built-in redundancy.
Availability
LTC3630AIDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3630AIDHC#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 its precision power portfolio, emphasizing high-reliability, high-performance analog ICs for demanding industrial, medical, and aerospace applications.
The LTC3630A belongs to Linear's high-voltage synchronous buck converter family, designed specifically for applications needing wide VIN range, ultra-low quiescent current, and integrated power switches in compact DFN packages.
FAQ
What is the maximum input voltage the LTC3630AIDHC#PBF can handle continuously?
The LTC3630AIDHC#PBF has a maximum operating input voltage of 76V and an absolute maximum rating of 80V. It is rated for continuous operation up to 76V across its full temperature range (–40°C to +125°C), making it suitable for 48V industrial systems and automotive load-dump conditions. Operation above 76V risks permanent damage even for brief durations.
How does the ISET pin on the LTC3630AIDHC#PBF set output current?
The ISET pin on the LTC3630AIDHC#PBF sources a 5µA (active) or 1µA (sleep) current that develops a voltage across an external resistor to ground, directly programming the peak inductor current comparator threshold. This sets the maximum average output current-e.g., a 100kΩ resistor yields ~0.45A peak, enabling ~225mA average output. LTC3630AIDHC#PBF supports 0.09A–1.2A peak current, corresponding to 45mA–500mA output.
Can the LTC3630AIDHC#PBF be used in parallel for higher current, and how?
Yes-the LTC3630AIDHC#PBF features an FBO (Feedback Comparator Output) pin that allows multiple units to be paralleled. Connect the FBO pin of one "master" LTC3630AIDHC#PBF to the VFB pins of "slave" units. This forces all devices to regulate to the same feedback threshold, enabling current sharing without external current-sense circuitry or complex timing alignment.
What is the purpose of the VPRG1 and VPRG2 pins on the LTC3630AIDHC#PBF?
VPRG1 and VPRG2 pins on the LTC3630AIDHC#PBF configure internal feedback resistor networks to deliver factory-trimmed fixed outputs: shorting both to GND enables adjustable mode (0.8V reference); tying VPRG1 to SS and VPRG2 to GND selects 5V; VPRG1 to GND and VPRG2 to SS selects 3.3V; both to SS selects 1.8V. This eliminates external resistors and associated tolerance/noise issues for standard voltages.
Does the LTC3630AIDHC#PBF require external compensation components?
No-the LTC3630AIDHC#PBF uses a hysteretic current-mode control architecture with internal compensation, requiring no external RC networks. Its stability is inherent to the Burst Mode® operation and feedback comparator design, simplifying layout and reducing component count. Only input/output capacitors and the inductor are mandatory external components for basic operation.
LTC3630AIDHC#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)
LTC3630AIDHC#PBF FAQ
1.How can I place an order for LTC3630AIDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AIDHC#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 LTC3630AIDHC#PBF reliable?
The price and inventory of LTC3630AIDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AIDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630AIDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AIDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AIDHC#PBF?
LTC3630AIDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AIDHC#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 LTC3630AIDHC#PBF?
For technical support, including LTC3630AIDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AIDHC#PBF requirements.
6.How does Aetrix verify that LTC3630AIDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AIDHC#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 LTC3630AIDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630AIDHC#PBF?
All LTC3630AIDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AIDHC#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 LTC3630AIDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630AIDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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