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Analog Devices Inc. LTC3637IDHC#PBF
- Part No.:
- LTC3637IDHC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637IDHC#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
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Product details
Overview
LTC3637IDHC#PBF from Analog Devices (formerly Linear Technology) is a 76V-input, 1A synchronous step-down DC/DC regulator with integrated 350mΩ high-side P-MOSFET, 12µA no-load quiescent current, and programmable peak current limit (100mA–1A). It operates from 4V to 76V input, delivers 0.8V to VIN output, and supports fixed (1.8V/3.3V/5V) or adjustable regulation - ideal for industrial control supplies and battery-operated avionics systems requiring wide-input, low-IQ power conversion.
For engineers reviewing the LTC3637IDHC#PBF datasheet, LTC3637IDHC#PBF pinout, LTC3637IDHC#PBF application, or LTC3637IDHC#PBF equivalent, key selection criteria include its 76V absolute max input rating, Burst Mode® operation enabling >90% efficiency at 1mA load, precise RUN/OVLO thresholds (1.21V rising), 0.8V ±1% feedback reference, and DFN-16 (3mm × 5mm) thermal performance (θJA = 43°C/W).
Technical Context
The LTC3637IDHC#PBF employs a hysteretic Burst Mode® architecture with internal P-channel MOSFET switch, eliminating external compensation and enabling stable regulation across 4V–76V input without loop stability concerns. Its peak current control uses a programmable 5µA ISET current source tied to an external resistor, directly setting trip threshold from 0.24A to 2.4A (max avg output = 1A).
Startup is managed by dual precision comparators: RUN pin enables operation above 1.21V (110mV hysteresis), while OVLO disables switching above 1.21V to protect against input overvoltage transients; both trigger internal soft-start reset. The device sustains 100% duty cycle dropout down to VIN = VOUT, leveraging the P-MOSFET topology for seamless low-dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports wide-range industrial, automotive, and avionic power buses including 24V, 48V, and 72V nominal systems. |
| Max Output Current | 1A average - derived from 2.4A typical peak current limit; programmable down to 0.24A peak (120mA avg) via ISET resistor. |
| Quiescent Current | 12µA in Burst Mode sleep - enables multi-year battery life in always-on portable instruments and remote sensors. |
| Feedback Reference | 0.8V ±1% - enables accurate output regulation from 0.8V up to VIN; supports 1.8V/3.3V/5V fixed outputs without external resistors. |
| Switch RDS(on) | 350mΩ - low conduction loss enables high efficiency at full load; thermally enhanced DFN package dissipates heat effectively (θJC = 5°C/W). |
| Soft-Start Time | 0.8ms internal or user-programmable - capacitor on SS pin sets ramp time (1ms per 16.5nF); prevents input droop during cold start. |
| Overvoltage Lockout | Programmable via OVLO pin - comparator trips at 1.21V rising; allows custom input overvoltage protection without external circuitry. |
| Operating Temp | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications; junction max = 150°C. |
Pinout & Package
Package: 16-lead (3mm × 5mm) plastic DFN with exposed thermal pad (Pin 17 = GND), 0.75mm profile, θJA = 43°C/W, θJC = 5°C/W. Exposed pad must be soldered to PCB ground plane for thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor and internal P-MOSFET drain; carries high di/dt switching current - requires tight layout and Kelvin connection. |
| VIN (3) | Main Input Supply | High-voltage input (4V–76V); bypassed with ceramic capacitor to GND for EMI suppression and transient energy storage. |
| FBO (5) | Feedback Comparator Output | Open-drain flag indicating regulation status; 20µA pull-up and 70Ω pull-down enable simple fault monitoring. |
| VPRG1/VPRG2 (6,7) | Output Voltage Select | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or tying to SS; eliminates external feedback resistors for standard outputs. |
| GND (8,16,17) | Ground Reference | Three GND connections including exposed thermal pad (Pin 17) - mandatory soldering ensures thermal reliability and low-noise reference. |
| VFB (9) | Feedback Input | Compares divided output voltage to 0.8V reference; direct connection to VOUT for fixed outputs; resistive divider for adjustable mode. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets output ramp time; internal 5µA current source provides linear voltage ramp - avoids inrush current stress. |
| ISET (11) | Peak Current Set | Resistor-to-GND programs peak current limit (0.24A–2.4A); 5µA current source enables precise, temperature-stable programming. |
| OVLO (12) | Overvoltage Lockout | Resistive divider from VIN sets shutdown threshold at 1.21V rising; protects downstream circuitry during input surges. |
| RUN (14) | Enable/Shutdown Control | 1.21V rising threshold enables regulation; <0.7V forces 3µA shutdown - supports system-level power sequencing and brownout protection. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Delivers >90% efficiency at 1mA load while drawing only 12µA supply current - extends battery life in always-on IoT sensors and medical monitors. |
| No External Compensation Required | Hysteretic control architecture eliminates loop compensation components - reduces BOM count, board area, and design validation effort. |
| Programmable Peak Current Limit | Adjusts max output from 120mA to 1A via single ISET resistor - optimizes inductor/capacitor size and light-load ripple for each application. |
| Precision RUN and OVLO Thresholds | 1.21V rising threshold with 110mV hysteresis enables accurate, noise-immune input voltage monitoring - critical for reliable startup in noisy industrial environments. |
| 100% Duty Cycle Dropout | P-MOSFET high-side switch maintains regulation down to VIN = VOUT - supports seamless operation during battery voltage sag or input brownout conditions. |
| Thermally Enhanced DFN Package | 3mm × 5mm footprint with exposed GND pad achieves θJC = 5°C/W - enables 1A continuous output in compact space-constrained designs like portable test equipment. |
Applications
| Industrial Control Supplies | Avionics Power Systems |
|---|---|
Use Scenario: Regulating unregulated 28V aircraft bus to 5V for flight data recorder logic. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, low-noise 5V rail with programmable OVLO to survive 100V transients. Use Value: 76V absolute max rating and 1.21V OVLO threshold ensure survival of MIL-STD-704A transients; 12µA IQ minimizes parasitic drain on backup batteries. | Use Scenario: Converting 72V main battery to 3.3V for cockpit display microcontroller. IC Role / Device Role / Timing Role: High-input buck converter with fixed 3.3V output configured via VPRG pins - no external feedback resistors required. Use Value: Eliminates two precision resistors and associated layout sensitivity; 0.8V reference tolerance ensures ±1% output accuracy over –40°C to +125°C. |
| Portable Medical Instruments | Automotive Body Electronics |
Use Scenario: Powering handheld ultrasound probe from dual-cell Li-ion (6V–8.4V) with ultra-low standby drain. IC Role / Device Role / Timing Role: Always-on 1.8V supply using Burst Mode® and internal soft-start to prevent battery voltage sag during wake-up. Use Value: 12µA no-load current extends single-charge operation to >5 years; programmable ISET allows optimization for 200mA peak probe current. | Use Scenario: Regulating 12V vehicle battery to 5V for CAN transceiver and sensor interface in engine bay. IC Role / Device Role / Timing Role: Robust buck regulator with RUN pin tied to ignition signal and OVLO set to 16V to ignore load-dump spikes. Use Value: 150°C junction rating and thermal pad ensure reliability at 105°C ambient; 4V–76V range covers cold-crank (6V) to load-dump (70V) extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A, 100ns min on-time, requires external compensation; 25µA IQ. | Automotive AEC-Q100 qualified; lacks programmable peak current and fixed-output VPRG pins. | Choose LM5164QPWPRQ1 when AEC-Q100 compliance is mandatory and external compensation is acceptable. |
| MAX20006AATP+T | 3.5V–65V input, 1A, integrated MOSFETs, 15µA IQ, fixed 3.3V/5V options but no adjustable mode. | Includes spread-spectrum clocking; no ISET programming or OVLO pin - less flexible for custom overvoltage protection. | Choose MAX20006AATP+T for EMI-sensitive infotainment systems where spread spectrum is prioritized over programmability. |
Compared with LM5164QPWPRQ1 and MAX20006AATP+T, the LTC3637IDHC#PBF uniquely combines 76V input capability, 12µA quiescent current, programmable peak current, and fixed-output VPRG configuration - making it optimal for high-reliability, wide-input, low-power industrial and avionic systems where flexibility and efficiency at microamp loads are critical.
Availability
LTC3637IDHC#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power systems, and portable medical instruments requiring stable component supply, long-lifecycle availability, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LTC3637IDHC#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 digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3637 belongs to ADI's high-voltage monolithic DC/DC regulator product line, designed specifically for rugged, wide-input industrial, aerospace, and automotive power conversion where reliability, low quiescent current, and programmable protection features are essential.
FAQ
What is the maximum input voltage rating for the LTC3637IDHC#PBF?
The LTC3637IDHC#PBF has an absolute maximum input voltage rating of 80V, with a specified operating range of 4V to 76V. This 76V upper limit ensures robust operation across harsh industrial and avionic power buses, including 48V telecom and 72V aircraft systems, while maintaining guaranteed performance and reliability within datasheet specifications.
How does the ISET pin on the LTC3637IDHC#PBF control output current?
The ISET pin on the LTC3637IDHC#PBF sources a precise 5µA current (1µA in sleep mode) that develops a voltage across an external resistor to ground, directly setting the peak inductor current threshold from 0.24A to 2.4A. Since the LTC3637IDHC#PBF's architecture delivers half the peak current as average output, this enables programmable max output from 120mA to 1A - allowing optimization of component size and light-load efficiency.
Can the LTC3637IDHC#PBF operate in 100% duty cycle dropout mode?
Yes, the LTC3637IDHC#PBF supports true 100% duty cycle operation due to its internal P-channel MOSFET high-side switch. When input voltage drops near the output level, the device sustains regulation by holding the switch continuously on - critical for battery-powered applications experiencing voltage sag, such as portable instruments during deep discharge or automotive cold-crank scenarios.
What package type and thermal characteristics does the LTC3637IDHC#PBF use?
The LTC3637IDHC#PBF uses a 16-lead 3mm × 5mm plastic DFN package with exposed thermal pad (Pin 17 = GND). It achieves θJA = 43°C/W and θJC = 5°C/W when the exposed pad is properly soldered to the PCB ground plane - enabling 1A continuous output in compact, thermally constrained layouts like handheld test equipment and avionics modules.
Does the LTC3637IDHC#PBF require external compensation components?
No, the LTC3637IDHC#PBF uses a hysteretic Burst Mode® control architecture that eliminates the need for external compensation components. Its internal feedback loop is inherently stable across all operating conditions and output capacitor types - reducing BOM count, PCB area, and design validation complexity compared to voltage-mode or current-mode controllers requiring loop compensation networks.
LTC3637IDHC#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
- 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#PBF FAQ
1.How can I place an order for LTC3637IDHC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637IDHC#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 LTC3637IDHC#PBF reliable?
The price and inventory of LTC3637IDHC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637IDHC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637IDHC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637IDHC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637IDHC#PBF?
LTC3637IDHC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637IDHC#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 LTC3637IDHC#PBF?
For technical support, including LTC3637IDHC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637IDHC#PBF requirements.
6.How does Aetrix verify that LTC3637IDHC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637IDHC#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 LTC3637IDHC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637IDHC#PBF?
All LTC3637IDHC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637IDHC#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 LTC3637IDHC#PBF part is unused and in its original packaging.
Return procedure for LTC3637IDHC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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