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Analog Devices Inc. LTC3637HMSE#TRPBF
- Part No.:
- LTC3637HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3637HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
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Product details
Overview
LTC3637HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input 76V step-down DC/DC regulator with integrated 350mΩ high-side P-channel MOSFET, programmable 0.1–1A output current, 12µA no-load quiescent current, and 0.8V ±1% feedback reference. It delivers regulated power in industrial control supplies, avionics, and battery-operated devices requiring robust input voltage handling from 4V to 76V.
For engineers reviewing the LTC3637HMSE#TRPBF datasheet, LTC3637HMSE#TRPBF pinout, LTC3637HMSE#TRPBF application, or LTC3637HMSE#TRPBF equivalent, key selection criteria include its programmable peak current limit (enabling ripple and component size optimization), Burst Mode® operation for ultra-low IQ across load range, precise RUN pin threshold (1.21V rising), internal soft-start (0.8ms default), and thermally enhanced MSE16 package rated for –40°C to 150°C junction temperature.
Technical Context
The LTC3637HMSE#TRPBF employs hysteretic Burst Mode® control with a P-channel MOSFET high-side switch, enabling 100% duty cycle low-dropout operation and inherent short-circuit protection via reverse-current detection. Its feedback loop compares VFB against a precision 0.8V reference, with VPRG1/VPRG2 pins selecting fixed 1.8V/3.3V/5V outputs or enabling adjustable mode.
Peak inductor current is set by an external resistor on ISET (240mA–2.4A typical), directly determining maximum average output current (half the peak value). Input overvoltage lockout (OVLO) and undervoltage lockout (UVLO) are independently programmable via resistive dividers on dedicated pins, and thermal shutdown activates at ~180°C with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 24V/48V industrial buses, automotive batteries, and PoE+ injectors. |
| Quiescent Current | 12µA in sleep mode - enables multi-year battery life in always-on remote sensors and portable instruments. |
| Output Voltage Range | 0.8V to VIN - allows flexible rail generation including 1.8V, 3.3V, 5V (via VPRG pins) or custom values using external divider. |
| Max Output Current | 1A (average) - achieved with 2A peak current setting; scalable down to 100mA average via ISET resistor. |
| Feedback Reference | 0.800V ±1% - ensures tight output regulation accuracy across temperature and line/load variations. |
| Package Thermal Rating | MSE16, θJA = 45°C/W - supports 150°C max junction temperature for high-reliability avionics and under-hood automotive use. |
| Switch On-Resistance | 350mΩ (typical) - minimizes conduction loss at high load currents and enables efficient 12V-to-5V conversion. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4mm footprint, 0.75mm height, exposed thermal pad (Pin 17) soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection to inductor and catch diode anode; carries high dv/dt switching waveform - requires tight layout and ground shielding. |
| VIN (3) | Main Input Supply | Accepts 4V–76V input; requires local 10µF ceramic bypass capacitor to GND for EMI suppression and transient response. |
| 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 Selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or tying to SS - eliminates external feedback resistors for standard rails. |
| GND (8,16,17) | Ground Reference | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - all must connect to low-impedance PCB ground plane for thermal and noise integrity. |
| VFB (9) | Feedback Input | Monitors divided output voltage; compared to 0.8V reference - connects to resistor divider in adjustable mode or directly to VOUT for fixed outputs. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms - prevents input droop during startup. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak current (240mA–2.4A); determines max output current and ripple - critical for inductor/capacitor sizing. |
| OVLO (12) | Overvoltage Lockout | Resistive divider from VIN sets disable threshold (>1.21V); triggers soft-start reset on transients - protects downstream circuitry. |
| RUN (14) | Enable/Shutdown Control | 1.21V rising threshold enables operation; <0.7V forces 3µA shutdown - enables precise UVLO or sequenced power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains 12µA IQ at no load while delivering full 1A output - extends battery life without sacrificing transient response. |
| Programmable Peak Current Limit | Adjustable 0.1A–1A output via single ISET resistor - optimizes inductor size, output ripple, and efficiency trade-offs per application. |
| No Compensation Required | Internally compensated hysteretic control - eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Precision RUN Threshold | 1.21V ±110mV hysteresis - enables accurate, repeatable power sequencing and undervoltage protection without external comparators. |
| Thermally Enhanced MSE16 | θJC = 10°C/W, exposed pad tied to GND - sustains 150°C junction temperature in compact industrial and avionics enclosures. |
Applications
| Industrial Control Supplies | Avionics Power Systems |
|---|---|
Use Scenario: Regulating 24V or 48V distributed bus to 3.3V/5V for PLC I/O modules, sensor interfaces, and fieldbus transceivers in harsh factory environments. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, low-noise logic supply with high input voltage tolerance and thermal resilience. Use Value: Eliminates need for pre-regulators or discrete FET solutions, reducing board area and improving MTBF in vibration-prone installations. | Use Scenario: Generating 5V and 3.3V rails from 28V aircraft bus for flight control computers, inertial measurement units (IMUs), and cockpit displays. IC Role / Device Role / Timing Role: High-reliability DC/DC converter meeting DO-160 lightning surge and temperature requirements (-40°C to +150°C). Use Value: Enables single-chip solution with built-in OVLO, UVLO, and thermal shutdown - reduces system-level redundancy and qualification burden. |
| Portable Medical Instruments | Battery-Operated Test Equipment |
Use Scenario: Powering handheld ultrasound probes, glucose meters, and infusion pump controllers from single Li-ion or dual alkaline cells. IC Role / Device Role / Timing Role: Ultra-low-quiescent buck regulator maintaining regulation during standby and enabling rapid wake-up from deep sleep. Use Value: 12µA sleep current extends battery runtime beyond 5 years in intermittent-use devices without compromising start-up speed. | Use Scenario: Supplying 1.8V core and 3.3V I/O rails for portable oscilloscopes, multimeters, and spectrum analyzers operating from 9V or 12V rechargeable packs. IC Role / Device Role / Timing Role: High-efficiency, low-ripple power source supporting sensitive analog front-ends and high-speed ADCs. Use Value: Programmable peak current and Burst Mode® minimize output ripple and thermal rise during burst measurements, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3637IMSE#TRPBF | Same architecture and pinout; rated for –40°C to 125°C junction temperature (vs. –40°C to 150°C for H-grade). | Suitable for commercial/industrial ambient environments but not extended-temperature avionics or under-hood automotive. | Select LTC3637HMSE#TRPBF when operation above 125°C ambient or sustained 150°C junction is required. |
| LTC3637HDHC#TRPBF | Identical electrical specs and temperature rating; uses 5mm × 3mm DFN package with θJA = 43°C/W (vs. MSE16's 45°C/W). | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile. | Choose LTC3637HDHC#TRPBF when board area is limited and thermal pad soldering is feasible. |
Compared with LTC3637IMSE#TRPBF, the LTC3637HMSE#TRPBF provides guaranteed operation up to 150°C junction temperature - essential for high-ambient avionics and industrial systems. Compared with LTC3637HDHC#TRPBF, it offers identical thermal capability in a more widely adopted MSOP footprint with established assembly processes.
Availability
LTC3637HMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power systems, and portable medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed high-temperature operation.
Supply support for LTC3637HMSE#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. (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 buck regulator product line, designed specifically for rugged, wide-input applications in industrial, aerospace, and medical equipment where reliability, low IQ, and thermal resilience are critical.
FAQ
What is the maximum junction temperature specification for the LTC3637HMSE#TRPBF?
The LTC3637HMSE#TRPBF is specified for operation up to 150°C junction temperature, with thermal shutdown activating at approximately 180°C. Its MSE16 package has θJA = 45°C/W and θJC = 10°C/W, enabling reliable performance in high-ambient environments such as avionics enclosures and industrial control cabinets. This rating is confirmed in the Absolute Maximum Ratings table and applies specifically to the H-grade variant of the LTC3637HMSE#TRPBF.
How does the ISET pin programming affect the maximum output current of the LTC3637HMSE#TRPBF?
The ISET pin on the LTC3637HMSE#TRPBF sets the peak inductor current via an external resistor to GND, with a typical range of 240mA to 2.4A. Since the LTC3637HMSE#TRPBF's architecture delivers half the peak current as average output current, a 2A peak setting yields 1A maximum average output. The LTC3637HMSE#TRPBF datasheet provides the equation RISET = 140k • IPEAK – 24k to select the resistor for target output current.
Can the LTC3637HMSE#TRPBF operate with 100% duty cycle, and what is the significance?
Yes, the LTC3637HMSE#TRPBF supports 100% duty cycle operation due to its P-channel high-side MOSFET topology, allowing regulation even when VIN approaches VOUT. This low-dropout capability is critical for battery-powered systems near end-of-discharge or automotive cold-crank scenarios. However, power dissipation increases significantly below ~10V VIN, requiring careful thermal design per the Applications Information section of the LTC3637HMSE#TRPBF datasheet.
What are the key differences between the MSE16 and DFN packages for the LTC3637HMSE#TRPBF?
The LTC3637HMSE#TRPBF is offered exclusively in the MSE16 package; the DFN variant is the LTC3637HDHC#TRPBF. While both share identical electrical specifications and H-grade temperature rating (–40°C to 150°C), the MSE16 has θJA = 45°C/W and uses a 3mm × 4mm MSOP footprint, whereas the DFN has θJA = 43°C/W and a 5mm × 3mm body. The MSE16 is preferred for legacy designs and ease of hand-soldering, while the DFN offers marginally better thermal performance in dense layouts.
Does the LTC3637HMSE#TRPBF require external compensation components?
No, the LTC3637HMSE#TRPBF uses an internally compensated hysteretic control architecture, eliminating the need for external compensation networks such as type-II or type-III compensators. This simplifies design, reduces BOM count, and improves immunity to layout parasitics - a key advantage confirmed in the FEATURES section of the LTC3637HMSE#TRPBF datasheet and validated across all operating conditions.
LTC3637HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3637HMSE#TRPBF FAQ
1.How can I place an order for LTC3637HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637HMSE#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 LTC3637HMSE#TRPBF reliable?
The price and inventory of LTC3637HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3637HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637HMSE#TRPBF?
LTC3637HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637HMSE#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 LTC3637HMSE#TRPBF?
For technical support, including LTC3637HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3637HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3637HMSE#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 LTC3637HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3637HMSE#TRPBF?
All LTC3637HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637HMSE#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 LTC3637HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3637HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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