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Analog Devices Inc. LTC3630MPDHC#PBF
- Part No.:
- LTC3630MPDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630MPDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,049
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Product details
Overview
LTC3630MPDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V–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, 12µA no-load quiescent current, and programmable peak current limit (100mA–1.2A). It supports fixed 1.8V/3.3V/5V or adjustable 0.8V–VIN outputs and is qualified for –55°C to 150°C operation in harsh industrial and avionics power systems.
For engineers reviewing the LTC3630MPDHC#PBF datasheet, LTC3630MPDHC#PBF pinout, LTC3630MPDHC#PBF application, or LTC3630MPDHC#PBF equivalent, this page delivers verified thermal performance (θJA = 43°C/W), Burst Mode® efficiency optimization, precise RUN pin threshold (1.21V rising), feedback reference accuracy (0.800V ±1%), and DFN-16 package layout guidance - all critical for high-reliability, wide-input-range buck converter design.
Technical Context
The LTC3630MPDHC#PBF employs Burst Mode® control with hysteretic feedback to achieve ultra-low 12µA quiescent current at no load while maintaining regulation. Its internal 0.8V reference and programmable VPRG1/VPRG2 pins enable seamless selection among 1.8V, 3.3V, 5V, or adjustable output configurations without external resistors.
Peak inductor current is set via ISET pin using a resistor-to-GND (100kΩ–open), directly determining maximum average output current (up to 500mA) and enabling ripple/efficiency trade-offs. The device features 100% duty-cycle dropout operation, internal soft-start (0.8ms default), and FBO pin for paralleling multiple units - all implemented without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports direct regulation from 12V, 24V, 48V, and automotive/avionics bus voltages without pre-regulation. |
| Output Current | Up to 500mA - maximum average load current, limited to half the programmed peak current (e.g., 1.2A peak → 600mA theoretical, but rated 500mA max). |
| Quiescent Current | 12µA typical in Burst Mode® sleep - enables multi-year battery life in always-on sensor or telemetry applications. |
| Feedback Reference | 0.800V ±1% - high-precision internal reference enabling ±1% output voltage accuracy with proper resistor tolerance. |
| Operating Temp Range | –55°C to 150°C - extended-grade qualification suitable for military, downhole, and engine-control environments. |
| Package Thermal Resistance | θJA = 43°C/W - thermally enhanced 5mm × 3mm DFN with exposed pad requires PCB ground plane soldering for reliability. |
| RUN Pin Threshold | 1.21V rising / 1.10V falling - precise undervoltage lockout with 110mV hysteresis for robust start-up sequencing. |
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 performance (θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor; ties drains of internal P-channel high-side and N-channel low-side MOSFETs. |
| VIN (3) | Main Input Supply | Accepts 4V–65V; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| RUN (5) | Enable/UVLO Control | Logic-level enable with 1.21V rising threshold; internal 2MΩ pull-up and 2µA current source allow resistor-divider UVLO programming. |
| VPRG1 (6), VPRG2 (7) | Output Voltage Selection | Configures fixed 1.8V/3.3V/5V or adjustable mode via grounding or connection to SS pin - eliminates external feedback resistors. |
| GND (8,14,16,17) | Ground Reference | Multiple GND pins including exposed thermal pad (Pin 17); all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback Input | Compares divided output voltage against 0.800V reference; short to VOUT for fixed-output modes. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms internal soft-start. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak current limit (100mA–1.2A); open = max, shorted = min; determines max output current and component sizing. |
| FBO (12) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down) for paralleling multiple LTC3630s - enables >500mA total output. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated high-side P-MOSFET and low-side N-MOSFET eliminate external diode, enabling >90% efficiency across 1mA–500mA loads. |
| Burst Mode® Operation | Reduces no-load IQ to 12µA by disabling switching during light loads - critical for battery-powered remote sensors. |
| No External Compensation Required | Internally compensated control loop eliminates need for loop-stability resistors/capacitors - reduces BOM count and layout sensitivity. |
| 100% Duty-Cycle Dropout | P-channel high-side switch enables continuous conduction down to VIN ≈ VOUT - supports brownout resilience in automotive stop-start systems. |
| Programmable Peak Current Limit | ISET pin allows resistor-based adjustment from 100mA to 1.2A peak, enabling optimized inductor/capacitor sizing and ripple reduction. |
Applications
| Industrial Control Supplies | Avionics Power Regulation |
|---|---|
Use Scenario: Regulating 28V aircraft bus to 3.3V for flight data recorder logic and interface ICs in temperature-cycled cabin environments. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing isolated, low-noise 3.3V rail with guaranteed operation from –55°C to 150°C junction. Use Value: Eliminates need for external UVLO circuitry and heatsink due to 12µA quiescent current and 43°C/W θJA in DFN package. |
Use Scenario: Powering inertial measurement unit (IMU) analog front-end and ADC from unregulated 270V DC aircraft supply via intermediate 28V stage. IC Role / Device Role / Timing Role: Secondary high-voltage-input buck converter generating stable 5V for precision analog circuitry with <1% output variation. Use Value: 65V max input and 0.800V ±1% reference ensure accurate scaling under wide input transients and temperature extremes. |
| Downhole Oilfield Sensors | Medical Portable Diagnostics |
Use Scenario: Converting 48V battery stack to 1.8V for low-power MEMS pressure transducers operating at 150°C ambient in drilling tools. IC Role / Device Role / Timing Role: High-temp-rated DC/DC converter delivering regulated 1.8V output with programmable peak current to minimize inductor size in confined tool housings. Use Value: –55°C to 150°C rating and 100kΩ ISET resistor option enable compact, reliable power in space-constrained, high-temperature environments. |
Use Scenario: Powering portable ultrasound probe FPGA and analog beamformer from dual-cell Li-ion (6V–8.4V) with strict EMI and battery-life requirements. IC Role / Device Role / Timing Role: Efficient step-down regulator operating in Burst Mode® to extend battery runtime while maintaining clean 3.3V supply for RF-sensitive circuits. Use Value: 12µA no-load IQ and integrated MOSFETs reduce heat generation and eliminate discrete diode forward drop, improving overall system efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630HDHC#PBF | Same DFN-16 package and electrical specs, but rated –40°C to 150°C (vs. –55°C to 150°C for MP grade). | Lacks extended low-temp qualification; unsuitable for cryogenic or polar deployment scenarios. | Select LTC3630MPDHC#PBF when operation below –40°C is required; otherwise LTC3630HDHC#PBF offers cost advantage. |
| LTC3630MPMSE#PBF | Same –55°C to 150°C rating and functionality, but in 16-lead MSOP package (θJA = 45°C/W vs. 43°C/W). | MSOP offers larger creepage/clearance for >65V transient immunity; DFN provides better thermal performance in space-constrained layouts. | Choose LTC3630MPDHC#PBF for thermal-limited designs; select LTC3630MPMSE#PBF where high-voltage isolation or legacy MSOP footprint is mandatory. |
Compared with LTC3630HDHC#PBF and LTC3630MPMSE#PBF, the LTC3630MPDHC#PBF uniquely combines extended low-temperature operation (–55°C), superior thermal resistance (43°C/W), and compact DFN packaging - making it optimal for aerospace, oilfield, and defense applications demanding both cold-start capability and high power density.
Availability
LTC3630MPDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power regulation, and downhole oilfield sensors requiring stable component supply across extreme temperature cycles and long production lifecycles.
Supply support for LTC3630MPDHC#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3630MPDHC#PBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for ruggedized power conversion in automotive, industrial, and aerospace systems where wide input range, low IQ, and extended temperature operation are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3630MPDHC#PBF?
The LTC3630MPDHC#PBF has an absolute maximum input voltage rating of 70V, with a specified operating input range of 4V to 65V. Operation within the 4V–65V range ensures full electrical performance and thermal reliability across its –55°C to 150°C junction temperature range. Exceeding 65V may trigger internal protection but is not guaranteed for continuous operation.
How does the ISET pin on the LTC3630MPDHC#PBF affect output current capability?
The ISET pin on the LTC3630MPDHC#PBF programs the peak inductor current limit from 100mA to 1.2A via a resistor to GND. Since the maximum average output current equals half the peak current, setting ISET for 1.2A peak yields the rated 500mA output. Lower ISET values reduce component stress and output ripple but proportionally decrease max load current.
Can the LTC3630MPDHC#PBF operate with 100% duty cycle, and what is the practical implication?
Yes, the LTC3630MPDHC#PBF supports 100% duty cycle via its P-channel high-side switch, allowing continuous conduction when VIN approaches VOUT. This enables stable regulation during input brownouts - for example, maintaining 3.3V output as a 12V battery drops to 3.6V - though power dissipation increases significantly below ~10V input.
What is the purpose of the FBO pin on the LTC3630MPDHC#PBF, and how is it used?
The FBO (Feedback Comparator Output) pin on the LTC3630MPDHC#PBF is an open-drain output (20µA pull-up, 70Ω pull-down) that enables parallel operation. Connecting the FBO of a "master" LTC3630MPDHC#PBF to the VFB pins of "slave" units forces current sharing, allowing combined output currents exceeding 500mA without external current-sense circuitry.
Does the LTC3630MPDHC#PBF require external compensation components?
No, the LTC3630MPDHC#PBF uses an internally compensated control loop and requires no external compensation components. This simplifies design, reduces bill-of-materials count, and improves layout robustness - especially important in high-reliability applications where component failure modes must be minimized.
LTC3630MPDHC#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):
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3630MPDHC#PBF FAQ
1.How can I place an order for LTC3630MPDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630MPDHC#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 LTC3630MPDHC#PBF reliable?
The price and inventory of LTC3630MPDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630MPDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630MPDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630MPDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630MPDHC#PBF?
LTC3630MPDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630MPDHC#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 LTC3630MPDHC#PBF?
For technical support, including LTC3630MPDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630MPDHC#PBF requirements.
6.How does Aetrix verify that LTC3630MPDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630MPDHC#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 LTC3630MPDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630MPDHC#PBF?
All LTC3630MPDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630MPDHC#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 LTC3630MPDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630MPDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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