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Analog Devices Inc. LTC3630IDHC#PBF
- Part No.:
- LTC3630IDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630IDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,858
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Product details
Overview
LTC3630IDHC#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, featuring 12µA no-load quiescent current, programmable peak current limit (50mA–500mA), and 0.8V ±1% feedback reference - used in industrial control supplies and battery-operated devices requiring wide-input, low-quiescent regulation.
For engineers reviewing the LTC3630IDHC#PBF datasheet, LTC3630IDHC#PBF pinout, LTC3630IDHC#PBF application, or LTC3630IDHC#PBF equivalent, key selection considerations include its 16-lead 3mm × 5mm DFN package with exposed thermal pad, Burst Mode® operation for ultra-low-light-load efficiency, precise RUN pin threshold (1.21V rising), and support for fixed (1.8V/3.3V/5V) or adjustable (0.8V–VIN) output configurations.
Technical Context
The LTC3630IDHC#PBF employs a hysteretic Burst Mode® control architecture with internal feedback comparator (0.8V reference), peak current limiting via ISET pin (programmable 0.12A–1.2A), and dual-stage soft-start (internal 0.8ms + external capacitor-based). Its P-channel high-side switch enables true 100% duty-cycle dropout operation down to VIN ≈ VOUT.
It integrates reverse-current protection, undervoltage lockout (3.45V rising), overtemperature shutdown (~180°C), and FBO pin for master-slave paralleling of multiple units - all while maintaining stable regulation across –40°C to +125°C junction temperature range in its thermally enhanced DFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports wide-input sources including automotive batteries, industrial rails, and PoE-derived supplies. |
| Output Current | Up to 500mA - maximum average load current, limited to half the programmable peak current (max 1.2A typical). |
| Quiescent Current | 12µA typical in Burst Mode® sleep - enables multi-year battery life in always-on portable instruments. |
| Feedback Reference | 0.8V ±1% - enables precise output regulation from 0.8V to VIN using external resistor divider. |
| Peak Current Limit | Programmable 50mA–500mA via ISET pin - allows optimization of inductor/capacitor size and light-load ripple. |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications. |
| Package | 16-lead 3mm × 5mm DFN with exposed GND pad - provides low θJA = 43°C/W for high-power-density layouts. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm, 0.75mm height) with exposed thermal pad (Pin 17, GND), rated for θJA = 43°C/W and TJMAX = 150°C. Exposed pad must be soldered to PCB ground plane.
| 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 input; requires local ceramic bypass capacitor to GND for stability and EMI reduction. |
| RUN (5) | Enable/control input | 1.21V rising threshold enables operation; 110mV hysteresis prevents chatter; supports precision UVLO via resistor divider. |
| VPRG1/VPRG2 (6,7) | Output voltage select | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or tying to SS pin per datasheet truth table. |
| GND (8,14,16,17) | Ground reference | Multiple GND pins plus exposed pad (Pin 17) - mandatory soldering ensures thermal performance and noise immunity. |
| VFB (9) | Feedback input | Compares divided output voltage against 0.8V reference; directly connects to VOUT in fixed-output mode. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default if floating. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak current threshold (0.12A–1.2A); 5µA current source enables simple scaling. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) for paralleling multiple LTC3630s in higher-current designs. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 12µA while maintaining regulation - critical for battery longevity in always-on systems. |
| Synchronous rectification | Integrated high-side P-MOSFET and low-side N-MOSFET eliminate external diode - improves full-load efficiency by ~5–10%. |
| 100% duty-cycle dropout | P-channel top switch sustains regulation as VIN approaches VOUT - essential for brownout resilience in automotive/industrial rails. |
| No compensation required | Internal loop compensation eliminates external RC network - reduces BOM count and layout sensitivity. |
| Programmable peak current | Adjustable 50mA–500mA limit via single ISET resistor - enables trade-off between component size, ripple, and efficiency. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering isolated sensor front-ends and PLC I/O modules in factory automation cabinets with 24V/48V bus inputs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3V/5V to microcontrollers and analog signal chains. Use Value: 65V max input withstands load-dump transients; 12µA quiescent current minimizes standby power in energy-conscious systems. |
Use Scenario: Regulating power for portable diagnostic equipment (e.g., handheld ultrasound, glucose meters) operating from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Main system supply IC converting variable battery voltage (3.0V–4.2V) to clean 1.8V/3.3V for ADCs and low-power processors. Use Value: Burst Mode® extends battery runtime; 0.8V feedback reference enables accurate low-voltage regulation critical for sensor accuracy. |
| Distributed Power Systems | Automotive Infotainment |
Use Scenario: Local point-of-load conversion in telecom base stations or server backplanes where 48V intermediate bus feeds multiple sub-systems. IC Role / Device Role / Timing Role: Secondary buck stage stepping 48V down to 5V/3.3V for FPGA I/O banks or communication PHYs. Use Value: Wide 4V–65V input accommodates bus variations; FBO pin enables current sharing across parallel converters for >500mA loads. |
Use Scenario: Powering display controllers and audio codecs in vehicle head units supplied from 12V battery with cold-crank (4.5V) and load-dump (60V) extremes. IC Role / Device Role / Timing Role: Robust primary DC/DC regulator providing regulated 5V rail despite harsh automotive voltage transients. Use Value: 65V absolute max rating and built-in UVLO (3.45V) ensure reliable start-up and fault recovery during cranking events. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 300mA, 1.5MHz fixed-frequency, requires external MOSFETs and compensation. | Designed for AEC-Q100 automotive qualification; lacks Burst Mode® and integrated switches. | Choose for automotive-qualified designs needing higher switching frequency and external FET flexibility. |
| TPS54202DRCT | 4.5V–17V input, 2A, 500kHz, integrated FETs, 25µA IQ, no programmable current limit. | Lower input voltage range; optimized for cost-sensitive consumer/industrial apps with moderate VIN. | Choose when input stays below 17V and higher output current (2A) is needed without paralleling. |
Compared with LM5164QDDARQ1 and TPS54202DRCT, the LTC3630IDHC#PBF uniquely combines ultra-low 12µA quiescent current, 4V–65V operation, integrated synchronous switches, and programmable peak current in a compact DFN - making it optimal for wide-input, battery-sensitive, and space-constrained industrial and portable applications.
Availability
LTC3630IDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, medical devices, and distributed power systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3630IDHC#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 high-performance power management portfolio with rigorous reliability testing and automotive-grade process controls.
The LTC3630 belongs to Linear's high-voltage synchronous buck converter family, designed specifically for rugged industrial, medical, and transportation applications demanding wide-input operation, ultra-low quiescent current, and robust thermal performance.
FAQ
What is the maximum input voltage rating for the LTC3630IDHC#PBF?
The LTC3630IDHC#PBF has an absolute maximum input voltage rating of 70V, with guaranteed operation from 4V to 65V. This allows safe use in automotive load-dump scenarios and industrial 48V systems. Operation above 65V is not specified and may compromise reliability or regulation accuracy. The device includes internal undervoltage lockout that disables switching below ~3.45V (rising) to prevent unstable startup.
How does the ISET pin on the LTC3630IDHC#PBF set output current capability?
The ISET pin on the LTC3630IDHC#PBF sources a 5µA (active) or 1µA (sleep) current; connecting a resistor from ISET to GND sets the peak inductor current threshold. For example, a 220kΩ resistor yields ~500mA peak current, enabling up to 250mA average output. Since maximum average current equals half the peak current, the LTC3630IDHC#PBF delivers up to 500mA average when ISET is left floating (1.2A peak typical). This direct scaling simplifies design for varying load requirements.
Can the LTC3630IDHC#PBF operate with 100% duty cycle, and what is the significance?
Yes, the LTC3630IDHC#PBF supports 100% duty cycle via its integrated P-channel high-side MOSFET, allowing continuous conduction when VIN drops near VOUT. This enables stable regulation during brownout conditions - such as automotive cranking (VIN ≈ 6V) powering a 5V rail - without dropout or reset. Unlike NMOS-based converters requiring bootstrap circuitry, this architecture eliminates external components and timing constraints for low-VIN operation.
What is the purpose of the FBO pin on the LTC3630IDHC#PBF, and how is it used?
The FBO (Feedback Comparator Output) pin on the LTC3630IDHC#PBF is an open-drain output that signals when the internal feedback comparator trips. It is used to parallel multiple LTC3630IDHC#PBF units: connect the FBO of a "master" device to the VFB pins of "slave" devices, forcing them to regulate to the same voltage and share load current. This method achieves >500mA total output without external current-sense circuitry or complex synchronization.
Does the LTC3630IDHC#PBF require external compensation components?
No, the LTC3630IDHC#PBF uses internal compensation and requires no external RC network. Its hysteretic Burst Mode® control architecture and integrated error amplifier eliminate the need for loop compensation components - reducing bill-of-materials count, PCB area, and design iteration time. This simplifies layout and improves robustness across varying input/output conditions and component tolerances, while maintaining stable regulation from 0.8V to VIN.
LTC3630IDHC#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3630IDHC#PBF FAQ
1.How can I place an order for LTC3630IDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630IDHC#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 LTC3630IDHC#PBF reliable?
The price and inventory of LTC3630IDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630IDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630IDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630IDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630IDHC#PBF?
LTC3630IDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630IDHC#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 LTC3630IDHC#PBF?
For technical support, including LTC3630IDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630IDHC#PBF requirements.
6.How does Aetrix verify that LTC3630IDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630IDHC#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 LTC3630IDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630IDHC#PBF?
All LTC3630IDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630IDHC#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 LTC3630IDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630IDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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