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Analog Devices Inc. LTC3630HDHC#TRPBF
- Part No.:
- LTC3630HDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630HDHC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
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Product details
Overview
LTC3630HDHC#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V to 65V 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, programmable peak current limit (100mA–1.2A), and 0.8V ±1% feedback reference - used in industrial control supplies and avionics power regulation.
For engineers reviewing the LTC3630HDHC#TRPBF datasheet, LTC3630HDHC#TRPBF pinout, LTC3630HDHC#TRPBF application, or LTC3630HDHC#TRPBF equivalent, this page delivers verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative options for high-voltage, low-quiescent-current buck conversion in extended-temperature environments.
Technical Context
The LTC3630HDHC#TRPBF employs Burst Mode® operation with hysteretic feedback control, enabling ultra-low 12µA quiescent current at no load while maintaining regulation. Its internal P-channel high-side and N-channel low-side synchronous switches eliminate external diode losses and support 100% duty-cycle dropout operation down to VIN ≈ VOUT.
Peak current is set via resistor-to-ground on ISET (100kΩ–open), directly determining maximum average output current (up to 500mA), inductor size, and light-load ripple trade-offs. The RUN pin provides precise 1.21V enable threshold with 110mV hysteresis, and FBO enables master-slave paralleling for higher current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports wide-range industrial, automotive, and avionics inputs without pre-regulation. |
| Output Current | Up to 500mA - maximum average output limited to half the programmable peak current (max 1.2A). |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on remote sensors. |
| Feedback Reference | 0.800V ±1% - enables precise adjustable outputs from 0.8V to VIN with minimal external components. |
| Operating Junction Temp | –40°C to +150°C - qualified for harsh-environment applications including engine bay and avionics enclosures. |
| Package Thermal Resistance | θJA = 43°C/W (DFN) - thermally enhanced 5mm × 3mm DFN with exposed GND pad for efficient PCB heat sinking. |
| Switch On-Resistance | Top switch: 1.00Ω, bottom switch: 0.53Ω - low RDS(on) minimizes conduction loss across full load range. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed GND pad (Pin 17), rated for –40°C to +150°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point between internal high-side and low-side MOSFETs; ties to inductor; carries high dv/dt switching waveform. |
| VIN (Pin 3) | Main input supply | Accepts 4V–65V input; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| RUN (Pin 5) | Enable control input | 1.21V rising threshold enables operation; 0.7V falling forces shutdown (5µA IQ); supports precision UVLO via resistor divider. |
| VPRG1/VPRG2 (Pins 6, 7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS; eliminates external feedback resistors for standard outputs. |
| GND (Pins 8, 14, 16, 17) | Ground reference | Multiple GND pins and exposed pad ensure low-impedance return path; critical for thermal performance and noise immunity. |
| VFB (Pin 9) | Feedback input | Compares divided output voltage against 0.8V reference; connects directly to VOUT for fixed outputs or to external divider for adjustable mode. |
| SS (Pin 10) | Soft-start control | Capacitor-to-GND sets output ramp time (1ms per 16.5nF); internal 0.8ms default ensures controlled start-up without input droop. |
| ISET (Pin 11) | Peak current programming | Resistor-to-GND sets peak current threshold (100mA–1.2A); determines max output current, component sizing, and light-load ripple. |
| FBO (Pin 12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) enables paralleling multiple LTC3630s for >500mA total output. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 12µA while maintaining regulation - essential for battery-powered and energy-harvesting systems. |
| Synchronous MOSFET integration | Eliminates external Schottky diode, improving efficiency by 5–10% at medium loads and enabling 100% duty-cycle dropout. |
| Programmable peak current limit | Adjusts max output current (100mA–1.2A) via single resistor - optimizes inductor/capacitor size and light-load ripple vs. efficiency trade-off. |
| Precision RUN pin threshold | 1.21V enable with 110mV hysteresis - enables robust, noise-immune input UVLO and system-level power sequencing. |
| Fixed-output configuration support | 1.8V/3.3V/5V selectable via VPRG1/VPRG2 - removes need for external feedback resistors, reducing BOM count and layout sensitivity. |
Applications
| Industrial Control Supplies | Avionics Power Regulation |
|---|---|
Use Scenario: Regulating 24V or 28V aircraft bus to 3.3V/5V for flight data recorders and sensor interfaces. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing isolated, low-noise, high-reliability DC power under extreme temperature and vibration. Use Value: 150°C junction rating and 65V input withstand capability ensure uninterrupted operation during transient overvoltages and thermal cycling. |
Use Scenario: Powering navigation computers and inertial measurement units (IMUs) from 270V DC aircraft distribution systems. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down high-voltage bus to intermediate rail (e.g., 12V), feeding downstream point-of-load regulators. Use Value: 65V absolute max input rating and robust UVLO prevent latch-up during bus transients; low IQ extends backup battery runtime. |
| Medical Device Power | Portable Instrumentation |
Use Scenario: Generating stable 5V/3.3V rails for portable ultrasound and patient monitors operating from Li-ion batteries (8.4V–30V). IC Role / Device Role / Timing Role: Main DC/DC converter delivering regulated power to microcontrollers, ADCs, and display drivers with minimal standby drain. Use Value: 12µA quiescent current enables multi-week standby without recharge; programmable ISET allows optimization for varying load profiles. |
Use Scenario: Powering handheld test equipment (e.g., multimeters, oscilloscope probes) from 9V alkaline or 12V LiFePO₄ packs. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying clean 3.3V to precision analog front-ends and wireless SoCs. Use Value: 0.8V ±1% reference and low output ripple (<10mV p-p) preserve signal integrity in sensitive measurement circuits. |
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#TRPBF | Same 4V–65V input, but adds programmable frequency (200kHz–2MHz) and external sync capability; higher IQ (25µA) in Burst Mode. | Preferred where EMI-sensitive environments require frequency dithering or synchronization to system clock. | Select when deterministic switching frequency or noise shaping is required; not drop-in due to different pinout and control logic. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 4.5V–65V input, 500mA, but uses external MOSFETs; IQ = 15µA; no integrated low-side switch. | Required for ASIL-B automotive applications; supports higher ambient temperatures (125°C case) but needs more external components. | Choose for automotive qualification and design flexibility; not pin-compatible and lacks FBO paralleling support. |
Compared with LTC3630HDHC#TRPBF, LTC3631EDHC#TRPBF offers frequency control at the cost of higher quiescent current and non-pin-compatible layout, while LM5164QDDARQ1 meets automotive reliability standards but increases BOM count and forfeits integrated synchronous rectification and master-slave paralleling.
Availability
LTC3630HDHC#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power regulation, and medical device power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3630HDHC#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 its legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC3630HDHC#TRPBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for ruggedized power conversion in aerospace, industrial, and medical systems where input transients, wide temperature operation, and ultra-low standby power are critical.
FAQ
What is the maximum input voltage rating for the LTC3630HDHC#TRPBF?
The LTC3630HDHC#TRPBF has an absolute maximum input voltage rating of 70V, with guaranteed operation from 4V to 65V. It is designed for high-input-voltage applications such as industrial 48V systems, avionics 270V DC buses (with appropriate pre-regulation), and automotive cold-crank scenarios. Operation above 65V is not recommended for sustained use due to increased stress on internal MOSFETs and thermal limitations.
Does the LTC3630HDHC#TRPBF support parallel operation for higher output current?
Yes, the LTC3630HDHC#TRPBF supports master-slave paralleling via its FBO (Feedback Comparator Output) pin. Connecting the FBO of a master LTC3630HDHC#TRPBF to the VFB pins of one or more slave devices synchronizes regulation and shares load current. This method enables scalable output beyond 500mA while preserving individual device protection features like thermal shutdown and current limiting.
What is the purpose of the ISET pin on the LTC3630HDHC#TRPBF?
The ISET pin on the LTC3630HDHC#TRPBF sets the peak inductor current threshold via an external resistor to GND, directly controlling maximum average output current (up to 500mA). It also serves as a filter node: adding capacitance here trades light-load output voltage ripple for reduced efficiency. Leaving ISET open yields 1.2A peak (500mA avg); shorting to GND yields 0.12A peak (60mA avg).
How does the RUN pin function on the LTC3630HDHC#TRPBF?
The RUN pin on the LTC3630HDHC#TRPBF provides precise enable/disable control: rising voltage above 1.21V enables normal operation, falling below 1.10V disables switching (Burst Mode® sleep), and dropping below 0.7V forces shutdown (5µA IQ). An internal 2MΩ pull-up and 2µA current source allow simple UVLO implementation using a resistor divider from VIN, ensuring reliable power sequencing.
What package type and thermal characteristics apply to the LTC3630HDHC#TRPBF?
The LTC3630HDHC#TRPBF uses a 16-lead 5mm × 3mm plastic DFN package with exposed GND pad (Pin 17). Its thermal resistance is θJA = 43°C/W and θJC = 5°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated performance and ensure safe operation at full load across the –40°C to +150°C junction temperature range.
LTC3630HDHC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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):
- 65V
- Voltage - Output (Min/Fixed):
- 0.8V (1.8V, 3.3V, 5V)
- Voltage - Output (Max):
- 65V
- 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)
LTC3630HDHC#TRPBF FAQ
1.How can I place an order for LTC3630HDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630HDHC#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 LTC3630HDHC#TRPBF reliable?
The price and inventory of LTC3630HDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630HDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3630HDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630HDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630HDHC#TRPBF?
LTC3630HDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630HDHC#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 LTC3630HDHC#TRPBF?
For technical support, including LTC3630HDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630HDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3630HDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3630HDHC#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 LTC3630HDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3630HDHC#TRPBF?
All LTC3630HDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630HDHC#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 LTC3630HDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3630HDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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