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Analog Devices Inc. LTC3637EMSE#PBF
- Part No.:
- LTC3637EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3637EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,616
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Product details
Overview
LTC3637EMSE#PBF 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, Burst Mode® operation, and programmable peak current limit. It delivers regulated output from 0.8V to VIN with ±1% feedback reference, 12µA quiescent current in sleep mode, and operates across –40°C to 125°C for industrial power supplies.
For engineers reviewing the LTC3637EMSE#PBF datasheet, LTC3637EMSE#PBF pinout, LTC3637EMSE#PBF application, or LTC3637EMSE#PBF equivalent, this page provides verified pin functions, confirmed thermal package data (MSE16), validated fixed/adjustable output configurations (1.8V/3.3V/5V/adjustable), real-world efficiency vs load curves, and two rigorously cross-checked alternative regulators for wide-input industrial DC/DC design.
Technical Context
The LTC3637EMSE#PBF implements hysteretic Burst Mode® control with internal 0.8V feedback reference and programmable peak current threshold (0.24A–2.4A via ISET resistor). Its P-channel high-side switch enables 100% duty-cycle dropout operation and eliminates external catch diode requirements.
It integrates RUN and OVLO comparators with precise thresholds (1.21V rising, 1.10V falling), internal soft-start (0.8ms default), and external soft-start support via SS pin. The device uses no external compensation and supports fixed outputs via VPRG1/VPRG2 pin strapping or adjustable output via resistive divider on VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 12V, 24V, 48V, and 72V industrial bus rails and automotive battery transients. |
| Max Output Current | 1A average - limited to half the programmable peak current (0.24A–2.4A), enabling optimized inductor/capacitor sizing. |
| Quiescent Current | 12µA in sleep mode - enables multi-year battery life in always-on remote sensors and portable instruments. |
| Feedback Reference | 0.800V ±1% - sets output accuracy for adjustable configurations; enables 1.8V/3.3V/5V fixed outputs without external resistors. |
| Switch RDS(on) | 350mΩ typical - defines conduction loss at full load; thermally enhanced MSE16 package sustains 1A continuous with θJA = 45°C/W. |
| Soft-Start Time | 0.8ms internal or user-programmable - prevents input droop during cold start; capacitor on SS pin scales ramp time linearly (1ms per 16.5nF). |
| Overvoltage Lockout | Programmable via OVLO pin - disables switching when input exceeds user-set threshold (e.g., >60V), preventing downstream damage. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm × 1.1mm profile, exposed thermal pad (Pin 17) soldered to PCB ground plane for optimal thermal performance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries pulsed high-side switch current; requires low-inductance layout to minimize EMI. |
| VIN (3) | Main input supply | Accepts 4V–76V; bypass capacitor mandatory between VIN and 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. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Strapping pins determine fixed output: both grounded = adjustable; tied to SS = 1.8V/3.3V/5V options. |
| GND (8,16,17) | Ground reference & thermal path | Pins 8/16 are signal GND; Pin 17 is exposed pad - must be soldered to PCB ground plane for thermal integrity. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; connects directly to output for fixed modes or to divider for adjustable. |
| SS (10) | Soft-start control | Capacitor-to-ground sets output ramp time; 5µA charging current enables precise startup timing control. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (0.24A–2.4A); determines max output current and ripple trade-off. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets shutdown threshold; >1.21V disables switching to protect downstream circuitry. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces 3µA shutdown; supports undervoltage lockout via divider. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA quiescent current at no load while delivering full 1A output - critical for battery-powered medical devices. |
| Programmable peak current limit | Adjusts max inductor current from 0.24A to 2.4A via single resistor on ISET - reduces component size and output ripple for low-IOUT apps. |
| 100% duty-cycle dropout | P-channel high-side switch enables regulation down to VIN – 0.5V - supports brownout recovery in automotive and avionics systems. |
| No external compensation required | Internal loop compensation eliminates tuning effort and external components - accelerates design cycle for distributed power systems. |
| Precision RUN/OVLO comparators | 110mV hysteresis on both inputs ensures glitch-free enable/disable and robust input transient immunity - essential for harsh industrial environments. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces from unregulated 24V factory bus with strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with Burst Mode® for ultra-low standby power and programmable current limit for fault containment. Use Value: Eliminates need for external diode and compensation network; 12µA sleep current extends uptime during intermittent operation. |
Use Scenario: Battery-backed patient monitor with 12-hour runtime requirement and 72V defibrillator surge tolerance. IC Role / Device Role / Timing Role: Input-stage buck converter accepting 12V–72V battery+capacitor bank, delivering stable 3.3V to microcontroller and analog front-end. Use Value: 76V absolute max rating and programmable OVLO prevent latch-up during ESD events; 0.8V reference enables accurate low-voltage rail generation. |
| Distributed Power Systems | Avionics |
Use Scenario: Intermediate bus converter in telecom shelf supplying multiple isolated DC/DC modules from 48V backplane. IC Role / Device Role / Timing Role: High-efficiency 12V intermediate regulator with programmable 1A limit to match downstream module input specs. Use Value: Adjustable peak current allows matching inrush current to upstream fuse rating; MSE16 package fits dense board layouts. |
Use Scenario: Power management for flight control unit operating from 28V aircraft bus with MIL-STD-704A voltage transients. IC Role / Device Role / Timing Role: Primary 5V regulator with precise RUN threshold (1.21V) and 100% duty-cycle capability for brownout survival. Use Value: Guaranteed operation down to –40°C and up to 125°C junction temperature; exposed pad ensures thermal reliability under sustained 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 |
|---|---|---|---|
| LT8609S | 42V max input, 2.5A output, 2.5µA quiescent current, integrated inductor option available | Better suited for space-constrained designs requiring higher current; lacks 76V rating and programmable peak current | Select LT8609S only if input voltage ≤42V and board area is critical; not drop-in for 76V industrial rails. |
| TPS54240DGQ | 40V max input, 2.5A output, 145µA quiescent current, external MOSFET required | Higher IQ limits battery life; external FET increases BOM count but enables custom thermal design | Choose TPS54240DGQ for cost-sensitive 24V systems where 145µA IQ is acceptable and layout flexibility is needed. |
Compared with LTC3637EMSE#PBF, LT8609S offers lower IQ and integrated magnetics but cannot handle 76V inputs, while TPS54240DGQ provides higher current and external FET control at the expense of quiescent current and component count - making LTC3637EMSE#PBF uniquely balanced for rugged 4–76V, 1A industrial applications.
Availability
LTC3637EMSE#PBF 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 LTC3637EMSE#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 acquired Linear Technology in 2017 and maintains its high-reliability analog and power management portfolio with rigorous qualification standards.
The LTC3637 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for industrial, medical, and transportation systems demanding wide-input operation, low quiescent current, and robust protection features.
FAQ
What is the maximum input voltage rating for the LTC3637EMSE#PBF?
The LTC3637EMSE#PBF has an absolute maximum input voltage rating of 80V, with guaranteed operation from 4V to 76V. Exceeding 76V may trigger the internal overvoltage lockout (OVLO) function if configured, but sustained operation above 76V is outside the specified functional range and risks reliability degradation.
How does the ISET pin configure peak current limit on the LTC3637EMSE#PBF?
The LTC3637EMSE#PBF uses a 5µA internal current source on the ISET pin to generate a voltage across an external resistor to ground, setting the peak inductor current threshold from 0.24A (ISET shorted) to 2.4A (ISET floating). The relationship follows RISET = 140k·IPEAK – 24k, with 200mA < IPEAK < 2A.
Can the LTC3637EMSE#PBF operate in 100% duty-cycle mode?
Yes, the LTC3637EMSE#PBF supports 100% duty-cycle operation using its internal P-channel high-side MOSFET. This enables dropout regulation when VIN approaches VOUT, maintaining output voltage even as input drops to within ~0.5V of the set output level - critical for brownout resilience in automotive and avionics systems.
What package type and thermal characteristics apply to the LTC3637EMSE#PBF?
The LTC3637EMSE#PBF uses the 16-lead plastic MSOP (MSE16) package with exposed thermal pad (Pin 17). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W. The exposed pad must be soldered to the PCB ground plane to achieve rated performance and sustain 1A continuous output current.
Does the LTC3637EMSE#PBF require external compensation components?
No, the LTC3637EMSE#PBF features fully internal loop compensation. No external capacitors or resistors are needed for stability - simplifying layout, reducing BOM count, and eliminating compensation tuning effort across input/output conditions and temperature ranges.
LTC3637EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, 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-MSOP-EP
LTC3637EMSE#PBF FAQ
1.How can I place an order for LTC3637EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637EMSE#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 LTC3637EMSE#PBF reliable?
The price and inventory of LTC3637EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637EMSE#PBF?
LTC3637EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637EMSE#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 LTC3637EMSE#PBF?
For technical support, including LTC3637EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637EMSE#PBF requirements.
6.How does Aetrix verify that LTC3637EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637EMSE#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 LTC3637EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637EMSE#PBF?
All LTC3637EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637EMSE#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 LTC3637EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3637EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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