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Analog Devices Inc. LTC3637EDHC#TRPBF
- Part No.:
- LTC3637EDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3637EDHC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,268
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Product details
Overview
LTC3637EDHC#TRPBF from Analog Devices (formerly Linear Technology) is a 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 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 power supplies where wide VIN and ultra-low IQ are critical.
For engineers reviewing the LTC3637EDHC#TRPBF datasheet, LTC3637EDHC#TRPBF pinout, LTC3637EDHC#TRPBF application, or LTC3637EDHC#TRPBF equivalent, key selection considerations include its 76V absolute max input rating, Burst Mode® operation enabling >85% efficiency at 1mA load, 0.8V ±1% feedback reference, programmable OVLO/RUN thresholds, and thermal performance in the 3mm × 5mm DFN package with exposed GND pad.
Technical Context
The LTC3637EDHC#TRPBF uses hysteretic Burst Mode® control with internal P-channel MOSFET switching, eliminating external compensation and enabling stable regulation across 4V–76V input while maintaining 12µA quiescent current at no load. Its peak current comparator threshold is set via ISET pin (0.24A–2.4A), directly determining maximum average output current (up to 1A).
It integrates precise RUN and OVLO comparators (1.21V rising threshold, 110mV hysteresis), internal soft-start (0.8ms default), and feedback reference (0.8V ±1%) with 2.5–7mV hysteresis. The device enters low-IQ sleep mode when VFB falls 5mV below reference, then resumes burst cycles upon voltage decay-enabling robust light-load efficiency without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports wide-range industrial, automotive, and avionics inputs including 48V telecom and 72V battery systems. |
| Max Output Current | 1A - determined by half the programmable peak current limit (2.4A typical), enabling compact 1A designs with minimal external components. |
| Quiescent Current | 12µA - enables multi-year battery life in always-on sensor nodes and portable instruments without sacrificing regulation. |
| Feedback Reference | 0.8V ±1% - provides accurate output setting across temperature; allows precise 1.8V/3.3V/5V fixed or adjustable outputs using external resistors. |
| Switch RDS(on) | 350mΩ - integrated P-MOSFET enables 100% duty cycle dropout operation and reduces BOM count versus external switch solutions. |
| Package | 16-lead 3mm × 5mm DFN with exposed GND pad - thermally enhanced (θJA = 43°C/W) for high-power density in space-constrained industrial PCBs. |
| Operating Temp | –40°C to +125°C - specified for extended industrial environments; junction temperature derating applies above 125°C. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed GND pad (Pin 17), requiring soldering to PCB ground plane for thermal performance (θJA = 43°C/W, θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries pulsed current through internal P-MOSFET; requires low-inductance layout to minimize EMI. |
| VIN (3) | Main input supply | Accepts 4V–76V; requires local 10µF ceramic bypass capacitor to GND for stability and transient response. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating regulation status; 20µA pull-up, 70Ω pull-down for system monitoring or sequencing. |
| VPRG1/VPRG2 (6,7) | Output voltage select | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS; eliminates external resistor divider for common outputs. |
| GND (8,16,17) | Ground reference | Multiple GND pins plus exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and electrical integrity. |
| VFB (9) | Feedback input | Monitors output via resistor divider; compares to 0.8V reference; 10nA bias current enables high-impedance sensing. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default ensures controlled start-up without input droop. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak current (0.24A–2.4A); 5µA current source enables precise, temperature-stable current limiting. |
| OVLO (12) | Overvoltage lockout | Resistive divider from VIN sets disable threshold (1.21V rising); prevents damage during input transients above 76V. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces 3µA shutdown; supports precise UVLO via external divider. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Enables >85% efficiency at 1mA load and 12µA no-load IQ-critical for battery-powered and energy-harvesting systems. |
| Programmable peak current limit | Adjustable 0.24A–2.4A via ISET resistor-optimizes inductor/capacitor size and output ripple for specific load requirements. |
| Integrated 350mΩ P-MOSFET | Eliminates external high-side switch and gate driver; supports 100% duty cycle dropout for low-VIN operation down to 0.8V output. |
| Precision RUN/OVLO comparators | 1.21V threshold with 110mV hysteresis-enables reliable input voltage monitoring and graceful recovery from transients without external ICs. |
| No-compensation required design | Stable with standard ceramic input/output capacitors-reduces design time and eliminates loop compensation calculations. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and field transmitters operating from 24V/48V rails with strict low-power standby requirements. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator delivering up to 1A with 12µA quiescent current during sensor polling intervals. Use Value: Enables >10-year battery backup life in remote telemetry units while maintaining fast wake-up response via programmable soft-start. |
Use Scenario: Supplying isolated analog front-ends and low-noise ADCs in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Low-ripple, low-noise 3.3V regulator with Burst Mode® suppression of switching artifacts near sensitive signal chains. Use Value: Achieves <10mVPP output ripple at 100mA load without additional LDO post-regulation, reducing component count and board area. |
| Distributed Power Systems | Avionics |
Use Scenario: Intermediate bus conversion in 28V aircraft subsystems powering FPGA, DSP, and interface ICs. IC Role / Device Role / Timing Role: Robust 28V-to-1.8V/3.3V regulator with 76V abs-max rating and overtemperature shutdown for fault-tolerant operation. Use Value: Sustains regulation during 100V load-dump transients via OVLO pin configuration, eliminating need for external TVS clamping. |
Use Scenario: Powering flight control sensors and inertial measurement units (IMUs) in harsh, high-reliability environments. IC Role / Device Role / Timing Role: High-reliability 12V-to-5V regulator with –40°C to +125°C operation, precise RUN threshold, and soft-start for cold-start compliance. Use Value: Meets DO-160 Section 22 surge immunity requirements via integrated OVLO and thermal shutdown-reducing qualification test burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | 42V max input, 3.5A output, 2.5µA IQ, synchronous rectification; requires external compensation. | Better suited for higher-current, lower-input-voltage applications (<42V); lacks programmable OVLO/RUN. | Select when >1A output or <42V VIN dominates design priorities-trade 76V capability for higher efficiency at mid-range loads. |
| TPS54260DGQR | 60V max input, 2.5A output, 140µA IQ, external MOSFETs; requires full compensation network. | Higher IQ limits battery life; external FETs increase layout complexity but allow custom RDS(on) optimization. | Choose when thermal constraints demand discrete FETs or when 60V VIN suffices-avoid if 76V tolerance or <15µA IQ is mandatory. |
Compared with LT8610EMSE#TRPBF and TPS54260DGQR, the LTC3637EDHC#TRPBF uniquely combines 76V input rating, 12µA quiescent current, and integrated P-MOSFET in a compact DFN-making it the only option for ultra-low-power, high-input-voltage industrial and avionics point-of-load regulation without external switches or compensation.
Availability
LTC3637EDHC#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 LTC3637EDHC#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3637EDHC#TRPBF belongs to Linear's high-voltage monolithic DC/DC regulator product line, designed specifically for rugged, wide-input industrial and transportation power systems where reliability, low IQ, and integration are paramount.
FAQ
What is the maximum input voltage rating for the LTC3637EDHC#TRPBF?
The LTC3637EDHC#TRPBF has an absolute maximum input voltage rating of 80V, with guaranteed operation from 4V to 76V. Exceeding 76V may trigger the OVLO pin if configured, but the device can safely sustain up to 80V without damage-even during shutdown-provided thermal limits are observed.
How does the LTC3637EDHC#TRPBF achieve 12µA quiescent current?
The LTC3637EDHC#TRPBF achieves 12µA quiescent current through Burst Mode® operation: during light loads, it enters sleep mode where the internal power switch and current comparators are disabled, drawing only 12µA from VIN. Regulation resumes only when VFB drops 5mV below the 0.8V reference.
Can the LTC3637EDHC#TRPBF operate in 100% duty cycle dropout mode?
Yes, the LTC3637EDHC#TRPBF supports 100% duty cycle operation due to its integrated P-channel MOSFET high-side switch. When VIN approaches VOUT, the switch remains fully on, delivering output current equal to the programmed peak current limit-enabling regulation down to VOUT = 0.8V even at VIN = 0.9V.
What is the function of the ISET pin on the LTC3637EDHC#TRPBF?
The ISET pin on the LTC3637EDHC#TRPBF sets the peak inductor current limit (0.24A–2.4A) via an external resistor to GND. A 5µA internal current source generates a voltage across RISET that adjusts the current comparator threshold-directly controlling maximum average output current (up to 1A) and enabling optimization of component size and ripple.
Does the LTC3637EDHC#TRPBF require external compensation components?
No, the LTC3637EDHC#TRPBF is internally compensated and requires no external compensation components. Its hysteretic Burst Mode® architecture provides inherent stability with standard ceramic input and output capacitors-eliminating loop compensation design effort and reducing bill-of-materials count.
LTC3637EDHC#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)
LTC3637EDHC#TRPBF FAQ
1.How can I place an order for LTC3637EDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637EDHC#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 LTC3637EDHC#TRPBF reliable?
The price and inventory of LTC3637EDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637EDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3637EDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637EDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637EDHC#TRPBF?
LTC3637EDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637EDHC#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 LTC3637EDHC#TRPBF?
For technical support, including LTC3637EDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637EDHC#TRPBF requirements.
6.How does Aetrix verify that LTC3637EDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3637EDHC#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 LTC3637EDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3637EDHC#TRPBF?
All LTC3637EDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637EDHC#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 LTC3637EDHC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3637EDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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