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Analog Devices Inc. LTC3630EDHC#PBF
- Part No.:
- LTC3630EDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630EDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,673
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Product details
Overview
LTC3630EDHC#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V–65V input, synchronous step-down DC/DC converter with integrated high-side and low-side MOSFETs, delivering up to 500mA output current, 12µA quiescent current in Burst Mode®, and programmable peak current limit (100mA–1.2A). It supports fixed 1.8V/3.3V/5V or adjustable 0.8V–VIN outputs and is used in industrial control supplies and battery-operated devices requiring wide-input, low-IQ regulation.
For engineers reviewing the LTC3630EDHC#PBF datasheet, LTC3630EDHC#PBF pinout, LTC3630EDHC#PBF application, or LTC3630EDHC#PBF equivalent, key selection criteria include its 65V max input rating, 0.8V ±1% feedback reference, 16-lead 3mm × 5mm DFN package with exposed thermal pad, and support for parallel operation via FBO pin - all critical for rugged, space-constrained power designs.
Technical Context
The LTC3630EDHC#PBF employs Burst Mode® control with hysteretic feedback to achieve ultra-low quiescent current (12µA) at no load while maintaining regulation. Its P-channel high-side and N-channel low-side synchronous switches enable 100% duty-cycle dropout operation and eliminate external diode losses.
Internal peak current limiting (via ISET pin resistor), precise RUN pin threshold (1.21V rising, 110mV hysteresis), and dual-mode soft-start (internal 0.8ms or external capacitor-controlled) ensure robust start-up across wide input transients and temperature ranges (–40°C to 125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - enables direct regulation from 12V/24V/48V industrial buses and automotive batteries without pre-regulation. |
| Max Output Current | 500mA - determined by half the programmable peak inductor current (up to 1.2A), supporting moderate-power embedded loads. |
| Quiescent Current | 12µA in Burst Mode® - sustains regulation during standby in battery-powered systems for extended shelf life. |
| Feedback Reference | 0.8V ±1% - sets tight output accuracy in adjustable mode; enables 0.8V–VIN output range with external resistor divider. |
| Switching Architecture | Synchronous buck with internal P-ch high-side + N-ch low-side MOSFETs - eliminates external diode, improves efficiency, enables 100% duty cycle. |
| Package | 16-lead 3mm × 5mm DFN (DHC) with exposed GND pad - provides low θJA = 43°C/W for thermally demanding environments. |
| Operating Temp | –40°C to 125°C junction - qualified for industrial and automotive under-hood applications with derating guidance. |
Pinout & Package
The LTC3630EDHC#PBF uses a 16-lead plastic DFN package (5mm × 3mm, 0.75mm height) with an exposed thermal pad (Pin 17) that must be soldered to PCB ground for optimal thermal performance (θJA = 43°C/W, θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point between internal high-side and low-side MOSFET drains; ties to inductor; carries high dv/dt switching waveform. |
| VIN (3) | Main input supply | Accepts 4V–65V input; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| RUN (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 (6,7) | Output voltage select | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS; selects internal feedback divider ratio. |
| GND (8,14,16,17) | Ground reference | Multiple GND pins and exposed pad provide low-impedance return path and thermal conduction; pad must be soldered. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.8V reference; directly connects to VOUT in fixed-output mode. |
| SS (10) | Soft-start control | Capacitor to GND sets output ramp time (1ms per 16.5nF); floating defaults to internal 0.8ms soft-start. |
| ISET (11) | Peak current programming | Resistor to GND sets peak inductor current (100mA–1.2A); determines max output current and component sizing. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) enables paralleling multiple LTC3630s for >500mA total current. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 12µA at no load while maintaining regulation - extends battery life in always-on sensor nodes. |
| Programmable peak current limit | Adjustable 100mA–1.2A via ISET resistor - optimizes inductor/capacitor size and light-load efficiency trade-offs. |
| 100% duty-cycle dropout | P-channel high-side switch enables continuous conduction down to VIN ≈ VOUT - maintains regulation during brownouts or low-battery conditions. |
| Parallel operation support | FBO pin allows master-slave configuration of multiple LTC3630EDHC#PBF units - scales output current beyond 500mA without external controllers. |
| No compensation required | Internally compensated hysteretic control loop - eliminates external compensation network, reducing BOM count and layout complexity. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus transceivers in 24V/48V factory automation systems with wide input variation and strict low-power standby requirements. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator converting unregulated 24V–60V rail to stable 3.3V/5V for microcontrollers and sensors. Use Value: 65V input rating tolerates line surges; 12µA quiescent current meets energy-saving mandates; DFN package fits dense control board layouts. | Use Scenario: Supplying isolated analog front-ends and low-power digital logic in portable diagnostic equipment powered by Li-ion batteries (8V–30V pack voltage). IC Role / Device Role / Timing Role: Efficient intermediate regulator stepping down battery voltage to 1.8V/3.3V for ADCs, op-amps, and BLE radios. Use Value: Adjustable output supports diverse sub-circuit voltages; Burst Mode® preserves battery runtime during idle periods; –40°C to 125°C rating covers clinical operating environments. |
| Distributed Power Systems | Automotive Infotainment |
Use Scenario: Local point-of-load conversion in telecom base station cards where 48V backplane feeds multiple 3.3V/5V rails with tight transient response needs. IC Role / Device Role / Timing Role: Synchronous buck converter providing regulated 5V for FPGA configuration and interface ICs. Use Value: FBO pin enables current sharing across multiple LTC3630EDHC#PBF units for higher reliability; low EMI due to controlled switching edges. | Use Scenario: Regulating 12V vehicle battery to 3.3V for infotainment head unit microprocessors and display drivers subject to cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Input-tolerant primary DC/DC stage with precise RUN pin UVLO to prevent brownout resets during engine start. Use Value: 4V–65V input range handles full automotive transient profile; 1.21V RUN threshold ensures clean enable/disable; DFN package withstands vibration. |
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 |
|---|---|---|---|
| LT8609S | Higher 42V max input, 2A output, Silent Switcher® architecture reduces EMI; requires external compensation. | Better suited for noise-sensitive RF/analog circuits; lacks FBO-based paralleling and 65V input capability. | Select LT8609S when EMI compliance is critical and input stays ≤42V; LTC3630EDHC#PBF preferred for 65V tolerance and simpler layout. |
| TPS54202 | Lower 28V max input, 2A output, integrated compensation, but 40µA IQ in Eco-mode vs. 12µA. | Cost-optimized for consumer-grade 12V systems; not rated for industrial temp or high-voltage transients. | Choose TPS54202 for cost-sensitive 12V applications with relaxed IQ and voltage requirements; LTC3630EDHC#PBF remains superior for ruggedized 48V+ designs. |
Compared with LT8609S and TPS54202, the LTC3630EDHC#PBF uniquely combines 65V input tolerance, 12µA quiescent current, FBO-based current sharing, and 16-lead DFN packaging - making it the only option meeting all four requirements simultaneously for high-reliability industrial and automotive point-of-load regulation.
Availability
LTC3630EDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, medical devices, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3630EDHC#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3630 product line delivers high-efficiency, wide-input synchronous buck converters optimized for rugged industrial, automotive, and medical applications where input transients, low quiescent current, and thermal reliability are critical design constraints.
FAQ
What is the maximum input voltage rating for the LTC3630EDHC#PBF?
The LTC3630EDHC#PBF has an absolute maximum input voltage rating of 70V, with a specified operating input range of 4V to 65V. This allows reliable operation across harsh industrial and automotive supply rails, including 48V systems and battery packs with transient overvoltage events. Exceeding 65V during normal operation may trigger internal protection but is not recommended for sustained use.
How does the ISET pin on the LTC3630EDHC#PBF control output current?
The ISET pin on the LTC3630EDHC#PBF programs the peak inductor current using an external resistor to GND, setting the threshold from 100mA to 1.2A. Since the maximum average output current equals half the peak current, this directly determines the achievable load current (e.g., 500mA max at 1.2A peak). The internal 5µA current source generates the control voltage, and the resistor value is calculated as RISET = IPEAK × 0.2 × 10⁶.
Can multiple LTC3630EDHC#PBF ICs be paralleled, and how is it implemented?
Yes, multiple LTC3630EDHC#PBF ICs can be paralleled using the FBO (feedback comparator output) pin. Connect the FBO pin of one "master" LTC3630EDHC#PBF to the VFB pins of one or more "slave" units. This forces all devices to regulate to the same feedback voltage, enabling current sharing. No external clock synchronization is needed, and the architecture inherently balances load without additional components.
What is the purpose of the RUN pin on the LTC3630EDHC#PBF, and what are its threshold voltages?
The RUN pin on the LTC3630EDHC#PBF controls device enable/disable with precise thresholds: operation begins when voltage rises above 1.21V (typical), and stops when it falls below 1.10V (110mV hysteresis). Pulling RUN below 0.7V forces shutdown mode (5µA IQ). This enables programmable undervoltage lockout using a resistor divider from VIN, ensuring clean start-up and brownout protection in variable-input systems.
Does the LTC3630EDHC#PBF require external compensation components?
No, the LTC3630EDHC#PBF uses an internally compensated hysteretic control architecture and requires no external compensation components. Its Burst Mode® operation and fixed-frequency-free design eliminate the need for loop compensation networks, reducing BOM count, PCB area, and design validation effort - a key advantage over voltage-mode or current-mode controllers requiring RC networks.
LTC3630EDHC#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)
LTC3630EDHC#PBF FAQ
1.How can I place an order for LTC3630EDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630EDHC#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 LTC3630EDHC#PBF reliable?
The price and inventory of LTC3630EDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630EDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630EDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630EDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630EDHC#PBF?
LTC3630EDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630EDHC#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 LTC3630EDHC#PBF?
For technical support, including LTC3630EDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630EDHC#PBF requirements.
6.How does Aetrix verify that LTC3630EDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630EDHC#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 LTC3630EDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630EDHC#PBF?
All LTC3630EDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630EDHC#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 LTC3630EDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3630EDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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