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Analog Devices Inc. LTC3630AMPDHC#PBF
- Part No.:
- LTC3630AMPDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630AMPDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
LTC3630AMPDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input 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, and maintains regulation with only 12µA quiescent current in Burst Mode® at no load - enabling long battery life in industrial sensors and avionics power rails.
For engineers reviewing the LTC3630AMPDHC#PBF datasheet, LTC3630AMPDHC#PBF pinout, LTC3630AMPDHC#PBF application, or LTC3630AMPDHC#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 support for parallel operation via FBO pin - all in a –55°C to 150°C rated 16-lead 5mm × 3mm DFN package.
Technical Context
The LTC3630AMPDHC#PBF employs Burst Mode® control with hysteretic feedback to achieve ultra-low quiescent current across load ranges. Its internal P-channel high-side switch enables true 100% duty-cycle operation for low-dropout regulation, while the synchronous N-channel low-side switch eliminates external diode losses.
Peak inductor current is set by an external resistor on ISET (5µA current source), directly determining maximum average output current (½ × IPEAK). The RUN pin provides precise enable threshold (1.21V rising, 1.10V falling) with 110mV hysteresis, and the FBO pin allows master-slave paralleling for >500mA applications without external current-sharing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct connection to 24V, 48V, and 72V industrial/automotive bus rails without pre-regulation. |
| Max Output Current | 500mA - determined by 1.2A typical peak current limit; adjustable down to 100mA peak (50mA avg) for low-power sensor nodes. |
| Quiescent Current | 12µA in Burst Mode® - enables multi-year battery operation in always-on remote monitoring systems. |
| Feedback Reference | 0.800V ±1% - enables precise output regulation from 0.8V to VIN; fixed 1.8V/3.3V/5V options reduce BOM count. |
| Package & Temp Range | 16-lead 5mm × 3mm DFN with exposed pad - rated for –55°C to 150°C junction temperature, suitable for under-hood automotive and downhole equipment. |
| Switch RON | Top: 1.00Ω, Bottom: 0.53Ω - low conduction loss enables >90% efficiency at 500mA with 24V→5V conversion. |
| Soft-Start | Internal 0.8ms + external capacitor programmable - prevents inrush current during cold-start in high-capacitance systems. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm), 0.75mm profile, exposed thermal pad (Pin 17) soldered to PCB ground plane. θJA = 43°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor; carries full switching current and high dv/dt - requires tight layout and Kelvin routing. |
| VIN (3) | Main Input Supply | High-voltage input rail (4V–76V); bypassed with ceramic capacitor directly to GND for EMI suppression. |
| RUN (5) | Enable Control | Logic-level enable with 1.21V threshold; internal 2MΩ pull-up enables UVLO configuration via resistor divider. |
| VPRG1/VPRG2 (6,7) | Output Voltage Select | Configures fixed 1.8V/3.3V/5V or adjustable mode - eliminates external feedback resistors in standard voltage apps. |
| GND (8,14,16,17) | Ground Return | Multiple GND pins + exposed pad ensure low-impedance return path and thermal dissipation. |
| VFB (9) | Feedback Input | Monitors output via resistor divider; compares to 0.8V reference - sensitive node requiring short, noise-free trace. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default ensures safe start without external parts. |
| ISET (11) | Peak Current Set | Resistor-to-GND programs IPEAK (100mA–1.2A); 5µA current source enables simple, accurate current limiting. |
| FBO (12) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down) for paralleling multiple LTC3630As in higher-current designs. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 12µA at no load while maintaining ±1% output regulation - critical for energy-harvesting and battery-backed systems. |
| Integrated Power Switches | Eliminates external MOSFETs and gate drivers; P-channel high-side enables 100% duty cycle for ultra-low dropout - supports VOUT = VIN − 0.5V at light loads. |
| Programmable Peak Current Limit | Adjusts max output current from 50mA to 500mA using single resistor on ISET - optimizes inductor/capacitor size and light-load efficiency. |
| Parallel Operation Support | FBO pin enables master-slave configuration without external current-sense or op-amps - scales output current linearly with unit count while preserving regulation accuracy. |
| Wide Temperature Rating | –55°C to 150°C operating junction range - qualified for aerospace, downhole, and engine-control applications where extended thermal margins are mandatory. |
Applications
| Industrial Control Supplies | Avionics Power Rails |
|---|---|
Use Scenario: Powering PLC I/O modules, field transmitters, and isolated RS-485 interfaces from unregulated 24V or 48V factory bus. IC Role / Device Role / Timing Role: Primary non-isolated buck 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 brownouts. | Use Scenario: Generating 5V and 3.3V rails for flight control computers, inertial measurement units (IMUs), and cockpit displays in commercial aircraft. IC Role / Device Role / Timing Role: High-reliability point-of-load converter meeting DO-160 Section 22 surge immunity and extended temperature requirements. Use Value: –55°C to 150°C rating ensures operation across stratospheric cruise and hot-ground conditions; FBO pin enables redundant power paths. |
| Medical Imaging Sensors | Automotive Telematics |
Use Scenario: Powering low-noise analog signal chains in portable ultrasound probes and MRI coil preamplifiers. IC Role / Device Role / Timing Role: Low-ripple, low-quiescent-current supply for precision ADCs and op-amps in battery-operated diagnostic tools. Use Value: Programmable peak current minimizes inductor size and EMI; 0.8V reference enables accurate 1.8V/2.5V bias generation. | Use Scenario: Regulating power for LTE modems, GNSS receivers, and CAN FD controllers in vehicle infotainment and telematics control units (TCUs). IC Role / Device Role / Timing Role: Robust buck converter handling 12V/24V automotive battery variations, including cranking (4.5V) and load dump (80V). Use Value: 80V absolute max input and internal UVLO prevent damage during alternator transients; 100% duty cycle sustains output during cold-cranking. |
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 |
|---|---|---|---|
| LTC3630AEDHC#PBF | Same silicon, –40°C to 125°C temp grade; lower max junction temperature rating. | Suitable for commercial/industrial environments without extreme thermal stress. | Select when full –55°C to 150°C range is unnecessary and cost optimization is prioritized. |
| LT8609SIV#PBF | 42V max input, 2.5A output, Silent Switcher® architecture; higher current, lower EMI, but narrower VIN range. | Better for noise-sensitive RF/analog circuits; not rated for >42V inputs like railway or industrial HV buses. | Choose for compact, low-EMI 12V→3.3V/5V conversion where 76V input capability is not required. |
Compared with LTC3630AEDHC#PBF, the LTC3630AMPDHC#PBF offers extended low-temperature operation and higher thermal margin for mission-critical deployments; versus LT8609SIV#PBF, it trades peak current and EMI performance for ultra-wide input range and ultra-low IQ - making it uniquely suited for high-voltage, low-power, thermally harsh applications.
Availability
LTC3630AMPDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power rails, medical imaging sensors, and automotive telematics requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LTC3630AMPDHC#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 digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3630A product line delivers high-efficiency, wide-input synchronous buck converters optimized for reliability-critical applications in automotive, aerospace, industrial, and medical systems - emphasizing ultra-low quiescent current, extended temperature operation, and robust transient handling.
FAQ
What is the maximum input voltage rating for the LTC3630AMPDHC#PBF?
The LTC3630AMPDHC#PBF has a maximum operating input voltage of 76V and an absolute maximum rating of 80V. This allows direct connection to 48V and 72V industrial power buses and tolerance of automotive load-dump transients up to 80V without external protection. Operation above 76V is limited to short-duration transients within the absolute maximum specification.
How does the ISET pin function in the LTC3630AMPDHC#PBF?
The ISET pin on the LTC3630AMPDHC#PBF sources a 5µA (1µA in sleep mode) current that, when passed through an external resistor to GND, sets the peak inductor current threshold between 100mA and 1.2A. Since maximum average output current equals half the peak current, this enables precise scaling of output capability from 50mA to 500mA - optimizing component size and light-load efficiency.
Can multiple LTC3630AMPDHC#PBF devices be paralleled, and how is it implemented?
Yes, multiple LTC3630AMPDHC#PBF devices can be paralleled using the FBO (Feedback Comparator Output) pin. Connect the FBO pin of one "master" device to the VFB pins of one or more "slave" devices. The master's FBO pulls down the slaves' feedback nodes to force current sharing - enabling scalable output current beyond 500mA without external current-sense circuitry or complex control loops.
What is the purpose of the VPRG1 and VPRG2 pins on the LTC3630AMPDHC#PBF?
The VPRG1 and VPRG2 pins on the LTC3630AMPDHC#PBF configure the output voltage mode: grounding both selects adjustable output (0.8V–VIN); tying VPRG1 to SS and VPRG2 to GND selects 5V fixed; VPRG1 to GND and VPRG2 to SS selects 3.3V; tying both to SS selects 1.8V. This eliminates external feedback resistors for common voltages, reducing BOM count and improving noise immunity on the VFB node.
Does the LTC3630AMPDHC#PBF support 100% duty-cycle operation, and why is it important?
Yes, the LTC3630AMPDHC#PBF supports 100% duty-cycle operation due to its internal P-channel high-side MOSFET. This enables dropout operation where VOUT closely tracks VIN - critical during automotive cold-cranking (e.g., 12V battery dropping to 4.5V) or industrial brownouts. At 100% duty cycle, the high-side switch remains continuously on, delivering output current up to the programmed peak limit.
LTC3630AMPDHC#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3630AMPDHC#PBF FAQ
1.How can I place an order for LTC3630AMPDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AMPDHC#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 LTC3630AMPDHC#PBF reliable?
The price and inventory of LTC3630AMPDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AMPDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630AMPDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AMPDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AMPDHC#PBF?
LTC3630AMPDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AMPDHC#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 LTC3630AMPDHC#PBF?
For technical support, including LTC3630AMPDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AMPDHC#PBF requirements.
6.How does Aetrix verify that LTC3630AMPDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AMPDHC#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 LTC3630AMPDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630AMPDHC#PBF?
All LTC3630AMPDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AMPDHC#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 LTC3630AMPDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630AMPDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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