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Analog Devices Inc. LTC3630AHDHC#TRPBF
- Part No.:
- LTC3630AHDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3630AHDHC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,018
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Product details
Overview
LTC3630AHDHC#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V–76V 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 (0.09A–1.2A), and 0.8V ±1% feedback reference - used in industrial control supplies requiring wide-input, low-quiescent-power regulation.
For engineers reviewing the LTC3630AHDHC#TRPBF datasheet, LTC3630AHDHC#TRPBF pinout, LTC3630AHDHC#TRPBF application, or LTC3630AHDHC#TRPBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, DFN-16 (5mm × 3mm) thermally enhanced package with exposed GND pad, Burst Mode® operation for light-load efficiency, and FBO pin support for current sharing across multiple converters.
Technical Context
The LTC3630AHDHC#TRPBF implements a hysteretic Burst Mode® control architecture with internal 0.8V feedback reference and programmable peak current comparator threshold (set via ISET pin resistor). It uses a P-channel high-side switch enabling 100% duty cycle dropout operation and integrates reverse-current protection and undervoltage lockout (UVLO) with 3.5V rising threshold and 150mV hysteresis.
Its feedback comparator output (FBO) enables master-slave paralleling of multiple units; RUN pin provides precise enable threshold (1.21V rising / 1.10V falling) with internal 2MΩ pull-up; VPRG1/VPRG2 pins select fixed 1.8V/3.3V/5V outputs or enable adjustable mode via external resistor divider at VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 24V, 48V, and 72V industrial/automotive rails without pre-regulation. |
| Max Output Current | 500mA - average output limited to half the programmable peak current (max 1.2A typical). |
| Quiescent Current | 12µA in sleep mode - enables battery-backed or energy-harvesting systems to maintain regulation for months. |
| Feedback Reference | 0.800V ±1% - sets output voltage accuracy and enables stable 0.8V–VIN range with external divider. |
| Peak Current Limit | 0.09A to 1.2A - adjusted via ISET-to-GND resistor (100kΩ → 0.6A; open → 1.2A; short → 0.12A). |
| Operating Temp Range | –40°C to 150°C junction - qualified for under-hood automotive, avionics, and high-temp industrial environments. |
| Package | 16-lead DFN (5mm × 3mm, 0.75mm height) with exposed GND pad - θJA = 43°C/W, requires PCB thermal pad for rated performance. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm), 0.75mm profile, exposed GND pad (Pin 17) requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor; ties drains of internal P-ch and N-ch MOSFETs - must be routed with low-inductance, high-current path. |
| VIN (3) | Main Input Supply | Accepts 4V–76V input; requires local 10µF+ ceramic bypass capacitor to GND for stability and EMI reduction. |
| RUN (5) | Enable Control | 1.21V rising threshold enables operation; <0.7V forces 5µA shutdown - supports UVLO via resistor divider from VIN. |
| VPRG1/VPRG2 (6,7) | Output Voltage Select | Configure fixed 1.8V/3.3V/5V or adjustable mode; both grounded → external VFB divider active. |
| GND (8,14,16,17) | Ground Reference | Multiple GND pins + exposed pad (Pin 17) - all must connect to low-impedance PCB ground plane for thermal dissipation and noise immunity. |
| VFB (9) | Feedback Input | Compares divided output to 0.8V reference; directly tied to VOUT for fixed outputs, or to resistor divider for adjustable mode. |
| SS (10) | Soft-Start Control | Capacitor to GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms internal soft-start - prevents input droop at startup. |
| ISET (11) | Peak Current Set | Resistor to GND programs peak current limit (0.09A–1.2A); also accepts CISET capacitor to reduce light-load ripple at efficiency cost. |
| FBO (12) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down) - connects to VFB of slave converters for current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains regulation at ultra-low load with 12µA supply current - extends battery life in always-on sensor nodes. |
| Integrated Power Switches | P-channel high-side + N-channel low-side MOSFETs eliminate external FETs and gate drivers - reduces BOM count and layout area. |
| Programmable Peak Current Limit | Adjusts max inductor current from 0.09A to 1.2A via single ISET resistor - optimizes inductor/capacitor size and light-load efficiency. |
| 100% Duty Cycle Dropout | P-channel top switch enables full conduction when VIN ≈ VOUT - sustains regulation during brownouts or low-input conditions. |
| Thermally Enhanced DFN | 5mm × 3mm package with exposed GND pad achieves θJC = 5°C/W - supports 500mA continuous output at 150°C junction temp. |
Applications
| Industrial Control Supplies | Automotive Power Systems |
|---|---|
Use Scenario: Regulating 24V or 48V vehicle battery or PLC backplane to 5V/3.3V for microcontrollers and I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, low-noise power to safety-critical logic and analog sensors. Use Value: 76V max input withstands load-dump transients; 150°C rating survives under-hood ambient; 12µA IQ preserves battery during sleep modes. | Use Scenario: Powering infotainment head units, ADAS camera modules, or telematics ECUs from 12V/24V battery rails. IC Role / Device Role / Timing Role: High-reliability point-of-load converter with programmable current limit to match varying system load profiles. Use Value: FBO pin enables scalable current delivery (e.g., two LTC3630AHDHC#TRPBF in parallel deliver >1A); Burst Mode® ensures silent operation near audio components. |
| Avionics Power Distribution | Medical Diagnostic Equipment |
Use Scenario: Converting 28V aircraft bus to 1.8V/3.3V for FPGA configuration, ADCs, and communication interfaces in flight control units. IC Role / Device Role / Timing Role: Ruggedized DC/DC stage meeting DO-160 lightning-induced transient and temperature requirements. Use Value: Absolute max VIN = 80V handles 28V bus surges; –40°C to 150°C rating covers cold-soak to hot-soak operational envelopes. | Use Scenario: Providing isolated auxiliary rails for portable ultrasound or patient monitoring devices powered by Li-ion batteries or AC adapters. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency regulator enabling multi-day battery runtime in handheld diagnostics. Use Value: 12µA sleep current minimizes standby drain; adjustable output supports diverse analog front-end voltage needs (1.8V–5V). |
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 |
|---|---|---|---|
| LTC3630AIMSE#TRPBF | Same IC die, MSOP-16 package (45°C/W θJA), –40°C to 125°C rating - larger footprint, lower thermal performance. | Suitable where board space allows larger package and ambient temps stay ≤125°C. | Select when DFN assembly is unavailable or thermal margin is sufficient with MSOP layout. |
| LM5164QDDARQ1 | 4.5V–65V input, 500mA, 1.5µA IQ, but uses external MOSFETs and requires compensation - no integrated low-side switch or FBO pin. | Preferred for AEC-Q100 automotive designs needing higher reliability qualification, but adds complexity and component count. | Choose only if AEC-Q100 certification is mandatory and external FET control is acceptable. |
Compared with LTC3630AIMSE#TRPBF, the LTC3630AHDHC#TRPBF offers superior thermal performance (θJA = 43°C/W vs. 45°C/W) and extended temperature capability (150°C vs. 125°C), while LM5164QDDARQ1 trades integration for automotive qualification - making LTC3630AHDHC#TRPBF optimal for compact, high-temp industrial and avionics use cases.
Availability
LTC3630AHDHC#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, automotive power systems, avionics power distribution, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3630AHDHC#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3630A product line delivers high-voltage, low-quiescent-current synchronous buck regulators optimized for harsh-environment applications where input voltage range, thermal robustness, and standby efficiency are critical - including under-hood automotive, factory automation, and airborne systems.
FAQ
What is the maximum input voltage rating for the LTC3630AHDHC#TRPBF?
The LTC3630AHDHC#TRPBF has an absolute maximum input voltage rating of 80V and a recommended operating range of 4V to 76V. Exceeding 80V may cause permanent damage. The device maintains regulation across this full range, supporting applications such as 48V telecom systems and 72V industrial battery stacks. Its UVLO circuit disables switching below ~3.5V to prevent erratic behavior during brownouts.
How does the ISET pin on the LTC3630AHDHC#TRPBF control output current?
The ISET pin on the LTC3630AHDHC#TRPBF sets the peak inductor current threshold via an internal 5µA current source flowing through an external resistor to GND. The resulting voltage adjusts the peak current comparator: 0.09A (ISET shorted), 0.6A (100kΩ), or 1.2A (ISET open). Since average output current is half the peak value, this directly limits max output to 500mA. The LTC3630AHDHC#TRPBF's ISET pin also supports optional capacitor filtering to reduce light-load output ripple.
Can multiple LTC3630AHDHC#TRPBF devices be paralleled for higher current?
Yes - the LTC3630AHDHC#TRPBF includes a dedicated FBO (Feedback Comparator Output) pin that enables current sharing. Connect the FBO pin of one "master" LTC3630AHDHC#TRPBF to the VFB pins of one or more "slave" units. This synchronizes regulation and distributes load current proportionally. No external clock or complex sequencing is required. The LTC3630AHDHC#TRPBF's matched internal references ensure tight current balance across paralleled units.
What is the purpose of the exposed pad (Pin 17) on the LTC3630AHDHC#TRPBF DFN package?
The exposed pad (Pin 17) on the LTC3630AHDHC#TRPBF is electrically and thermally connected to GND and must be soldered to a large PCB copper area for effective heat dissipation. With θJC = 5°C/W, it lowers junction temperature rise under 500mA load - critical for operation up to 150°C junction. Leaving it unconnected degrades thermal performance by >30°C and risks premature thermal shutdown. The pad also improves electrical grounding for noise-sensitive feedback paths.
Does the LTC3630AHDHC#TRPBF support adjustable output voltages?
Yes - the LTC3630AHDHC#TRPBF supports both fixed and adjustable outputs. To configure adjustable mode, tie both VPRG1 and VPRG2 pins to GND, then use an external resistor divider from VOUT to GND, connecting the midpoint to VFB. The internal 0.800V ±1% reference determines output: VOUT = 0.8V × (1 + R1/R2). Fixed outputs (1.8V, 3.3V, 5V) are selected by shorting VPRG1/VPRG2 to SS or GND per datasheet table - eliminating external resistors for common rail voltages.
LTC3630AHDHC#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):
- 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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3630AHDHC#TRPBF FAQ
1.How can I place an order for LTC3630AHDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AHDHC#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 LTC3630AHDHC#TRPBF reliable?
The price and inventory of LTC3630AHDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AHDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3630AHDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AHDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AHDHC#TRPBF?
LTC3630AHDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AHDHC#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 LTC3630AHDHC#TRPBF?
For technical support, including LTC3630AHDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AHDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3630AHDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AHDHC#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 LTC3630AHDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3630AHDHC#TRPBF?
All LTC3630AHDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AHDHC#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 LTC3630AHDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3630AHDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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