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Analog Devices Inc. LTC3637IDHC#TRPBF
- Part No.:
- LTC3637IDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637IDHC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,842
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Product details
Overview
LTC3637IDHC#TRPBF from Analog Devices (formerly Linear Technology) is a 4V–76V input, 1A synchronous step-down DC/DC regulator with integrated 350mΩ high-side P-channel MOSFET, 12µA no-load quiescent current, and programmable peak current limit (0.24A–2.4A). It delivers regulated output from 0.8V to VIN in adjustable or fixed 1.8V/3.3V/5V configurations, supporting industrial control supplies and battery-operated devices requiring wide-input, low-IQ regulation.
For engineers reviewing the LTC3637IDHC#TRPBF datasheet, LTC3637IDHC#TRPBF pinout, LTC3637IDHC#TRPBF application, or LTC3637IDHC#TRPBF equivalent, key selection considerations include its 76V absolute max input rating, 0.8V ±1% feedback reference, programmable OVLO/RUN thresholds, Burst Mode® operation for light-load efficiency, and DFN-16 (5mm × 3mm) thermal performance with exposed GND pad.
Technical Context
The LTC3637IDHC#TRPBF implements a hysteretic Burst Mode® control architecture with internal P-channel MOSFET switching, where output regulation is maintained by alternating burst cycles (with inductor current ramp-up/down) and sleep cycles (12µA IQ). Peak current is set via external resistor on ISET pin, directly determining maximum average output current (IOUT(MAX) = 0.5 × IPEAK).
It features dual-programmable voltage monitoring: RUN pin enables/disables operation at 1.21V rising threshold (110mV hysteresis), while OVLO pin provides overvoltage lockout at 1.21V (1.10V falling). Feedback uses a precision 0.800V reference with ±1% tolerance over temperature, selectable for fixed outputs via VPRG1/VPRG2 pin strapping or external resistive divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports wide-input sources including automotive batteries, industrial rails, and PoE-derived supplies. |
| Max Output Current | 1A - achievable with 2.4A peak current setting; reduced to 0.5A or 0.12A via ISET resistor programming. |
| Quiescent Current | 12µA in Burst Mode® sleep - enables multi-year battery life in always-on sensor nodes. |
| Feedback Reference | 0.800V ±1% - ensures ±1.25% output accuracy across temperature and line/load conditions. |
| Switch RDS(ON) | 350mΩ - limits conduction loss at 1A, enabling >90% efficiency at mid-load with proper layout. |
| Soft-Start Time | 0.8ms internal or programmable via SS pin capacitor - prevents input droop during cold start. |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded systems. |
| Package | 16-lead 5mm × 3mm DFN with exposed GND pad - θJA = 43°C/W; requires PCB thermal vias for full 1A capability. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 3mm, 0.75mm height) with exposed GND pad (Pin 17) - must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor and catch diode anode; carries pulsed high-current switching waveform. |
| VIN (3) | Main input supply | Accepts 4V–76V input; requires local 10µF ceramic bypass to GND for stability. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating regulation status; 20µA pull-up, 70Ω pull-down impedance. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Strap to GND/SS to select 1.8V/3.3V/5V fixed output or enable adjustable mode. |
| GND (8,16,17) | Ground reference | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - all must connect to solid PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; connects to resistor divider (adjustable) or VOUT (fixed). |
| 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 (0.24A–2.4A); open = max, shorted = min. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets disable threshold (1.21V rising); tie to GND to disable feature. |
| RUN (14) | Enable/disable control | 1.21V rising enables operation; <0.7V forces 3µA shutdown; optional UVLO via divider. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ while delivering full 1A output - critical for energy-harvesting and battery longevity. |
| Programmable peak current limit | Adjusts IPEAK from 0.24A to 2.4A via single resistor - optimizes inductor/capacitor size and light-load ripple. |
| Wide 0.8V–VIN output range | Supports both low-voltage logic rails (1.8V/3.3V) and higher intermediate buses (12V/24V) without external components. |
| Precision RUN/OVLO comparators | 110mV hysteresis on both pins enables robust input voltage windowing - prevents erratic startup or fault recovery. |
| No compensation required | Internally compensated control loop eliminates external compensation network - reduces BOM count and layout sensitivity. |
| 100% duty cycle dropout | P-channel high-side switch sustains regulation down to VIN – VOUT ≈ 0V - essential for brownout resilience in automotive and avionics. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus transceivers from unregulated 24VDC industrial rails with transient spikes up to 75V. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 5V/3.3V for microcontrollers, ADCs, and isolated gate drivers. Use Value: 76V max input and programmable OVLO prevent damage during load-dump events; 12µA IQ minimizes standby power in distributed control nodes. |
Use Scenario: Battery-backed portable diagnostic equipment requiring >5-year shelf life and reliable wake-up from deep sleep. IC Role / Device Role / Timing Role: System power manager converting Li-ion (3.0–4.2V) or primary battery (9–36V) to 1.8V/3.3V for low-power sensors and BLE radios. Use Value: Burst Mode® extends battery runtime; precise 0.8V reference ensures consistent ADC reference accuracy across temperature. |
| Distributed Power Systems | Avionics |
Use Scenario: Point-of-load regulation in telecom/datacom chassis where 48V backplane feeds multiple 12V/5V subsystems. IC Role / Device Role / Timing Role: Secondary buck converter delivering 12V @ 1A to FPGA I/O banks or Ethernet PHYs with tight transient response. Use Value: Programmable peak current allows optimization for fast load steps; 0.75mm DFN footprint saves board space in dense modules. |
Use Scenario: Power conversion in airborne navigation units operating from 28V aircraft bus with stringent EMI and thermal constraints. IC Role / Device Role / Timing Role: High-reliability DC/DC stage supplying 5V to flight-critical microprocessors and memory subsystems. Use Value: –40°C to +125°C rating meets DO-160 environmental requirements; exposed pad enhances thermal margin under sustained 1A load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8#TRPBF | 42V max input, 2.5A output, 2.5µA IQ, Silent Switcher® architecture; smaller 3mm × 4mm package. | Better EMI performance and lower IQ, but insufficient for >42V inputs like industrial 48V+ or automotive load dump. | Select when EMI compliance is critical and input stays ≤42V; not suitable for 76V applications. |
| TPS54202HDDCR | 60V max input, 2A output, 26µA IQ, integrated compensation; SOIC-8 package with higher θJA. | Higher max current and simpler layout, but lacks programmable OVLO/RUN and has looser 1% FB tolerance. | Prefer for cost-sensitive 2A designs below 60V where precision voltage monitoring is non-critical. |
Compared with LT8609SIS8#TRPBF and TPS54202HDDCR, the LTC3637IDHC#TRPBF uniquely combines 76V input capability, sub-15µA quiescent current, and dual-programmable voltage monitoring - making it irreplaceable for high-voltage industrial and avionics point-of-load regulation where reliability under extreme transients is mandatory.
Availability
LTC3637IDHC#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, medical devices, and avionics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3637IDHC#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous qualification standards.
The LTC3637 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged industrial, automotive, and aerospace applications demanding wide-input operation, ultra-low quiescent current, and robust fault protection.
FAQ
What is the maximum input voltage rating for the LTC3637IDHC#TRPBF?
The LTC3637IDHC#TRPBF has an absolute maximum input voltage rating of 80V, with continuous operation specified from 4V to 76V. Exceeding 76V may trigger the internal OVLO circuit if configured, but the device remains undamaged up to 80V per Absolute Maximum Ratings. This makes LTC3637IDHC#TRPBF suitable for applications with high-voltage transients such as automotive load dump or industrial 48V+ systems.
How does the ISET pin program output current in the LTC3637IDHC#TRPBF?
The ISET pin on the LTC3637IDHC#TRPBF sources a 5µA (active) or 1µA (sleep) current that develops a voltage across an external resistor to ground, setting the peak inductor current threshold between 0.24A and 2.4A. Since maximum average output current equals half the peak current, this allows precise scaling of the LTC3637IDHC#TRPBF's 1A capability down to 0.12A - optimizing component size and light-load efficiency.
Can the LTC3637IDHC#TRPBF operate in 100% duty cycle dropout mode?
Yes, the LTC3637IDHC#TRPBF supports true 100% duty cycle operation using its internal P-channel high-side MOSFET. When input voltage approaches output voltage, the switch remains continuously on, sustaining regulation without dropout - a critical feature for automotive cold-crank (e.g., 6V input → 5V output) and avionics brownout scenarios where uninterrupted power is mandatory.
What package type and thermal requirements apply to the LTC3637IDHC#TRPBF?
The LTC3637IDHC#TRPBF uses a 16-lead 5mm × 3mm plastic DFN package with an exposed GND pad (Pin 17). For reliable 1A operation, this pad must be soldered to a multilayer PCB ground plane with ≥6 thermal vias (0.3mm diameter) to minimize θJA. Its rated θJA is 43°C/W; exceeding thermal limits risks derating or intermittent shutdown above 125°C junction temperature.
Does the LTC3637IDHC#TRPBF require external compensation components?
No, the LTC3637IDHC#TRPBF features an internally compensated control loop and requires no external compensation components. This simplifies design, reduces BOM count, and improves immunity to layout parasitics - a key advantage over many competing controllers that mandate RC networks for stability across varying output capacitors and loads.
LTC3637IDHC#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
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 76V
- Current - Output:
- 1A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3637IDHC#TRPBF FAQ
1.How can I place an order for LTC3637IDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637IDHC#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 LTC3637IDHC#TRPBF reliable?
The price and inventory of LTC3637IDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637IDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3637IDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637IDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637IDHC#TRPBF?
LTC3637IDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637IDHC#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 LTC3637IDHC#TRPBF?
For technical support, including LTC3637IDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637IDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3637IDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3637IDHC#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 LTC3637IDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3637IDHC#TRPBF?
All LTC3637IDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637IDHC#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 LTC3637IDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3637IDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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