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Analog Devices Inc. LTC3637MPMSE#PBF
- Part No.:
- LTC3637MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3637MPMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:266
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Product details
Overview
LTC3637MPMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input 76V step-down DC/DC regulator with integrated 350mΩ P-channel MOSFET, programmable peak current limit (0.24A–2.4A), and 12µA no-load quiescent current. It delivers up to 1A output in thermally enhanced MSE16 package and supports fixed (1.8V/3.3V/5V) or adjustable (0.8V–VIN) outputs - ideal for industrial control supplies and avionics power rails where input transients and extended temperature operation are critical.
For engineers reviewing the LTC3637MPMSE#PBF datasheet, LTC3637MPMSE#PBF pinout, LTC3637MPMSE#PBF application, or LTC3637MPMSE#PBF equivalent, key selection criteria include its –55°C to 150°C operating junction range, programmable overvoltage lockout (OVLO), internal soft-start, low dropout (100% duty cycle), and Burst Mode® operation enabling ultra-low IQ across load currents from 1mA to 1A.
Technical Context
The LTC3637MPMSE#PBF implements a hysteretic Burst Mode® control architecture with an internal high-side P-channel MOSFET switch, eliminating external compensation and enabling stable regulation without loop stability concerns. Its feedback comparator uses a precise 0.800V ±1% reference and supports both fixed-output configurations (via VPRG1/VPRG2 pin strapping) and adjustable outputs via external resistor divider.
Peak inductor current is set by a resistor from ISET to GND (240mA–2.4A typical), directly determining maximum average output current (half the peak value). The RUN pin provides precise undervoltage lockout (1.10V–1.25V threshold with 110mV hysteresis), while OVLO enables programmable overvoltage protection - both critical for robust operation in automotive and avionics environments with wide supply excursions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 24V, 48V, and 72V industrial/avionic bus rails without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - adjustable output or factory-configurable 1.8V/3.3V/5V fixed options reduce BOM count. |
| Max Output Current | 1A continuous - limited by peak current programming (max 2.4A peak → 1.2A avg theoretical, derated to 1A for thermal safety). |
| Quiescent Current | 12µA in Burst Mode sleep - enables >10-year battery life in always-on remote sensors or backup systems. |
| Feedback Reference | 0.800V ±1% - ensures ±1.25% output accuracy over –55°C to 150°C without external trimming. |
| Package Thermal Resistance | θJA = 45°C/W (MSE16) - requires minimal PCB copper area for full 1A operation at TA ≤ 85°C. |
| Operating Junction Temp | –55°C to 150°C - qualified for military-grade and extended-temperature avionics applications. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm × 1.1mm, exposed pad (Pin 17) soldered to PCB ground for thermal performance. θJA = 45°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Drain of internal P-MOSFET; connects to inductor; carries high di/dt switching current - requires tight layout and Kelvin return path. |
| VIN (3) | Main input supply | Accepts 4V–76V; bypass capacitor required between VIN and GND to suppress high-frequency noise and support transient current. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating regulation status; 20µA pull-up, 70Ω pull-down - used for power-good signaling or sequencing. |
| VPRG1/VPRG2 (6,7) | Output voltage configuration | Strap pins to GND or SS to select 1.8V/3.3V/5V fixed output or enable adjustable mode - eliminates external resistors for standard voltages. |
| GND (8,16,17) | Ground reference & thermal path | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - must be soldered to ≥200mm² PCB ground plane for thermal integrity. |
| VFB (9) | Feedback input | Compares divided output to 0.800V reference; connects to resistor divider (adjustable) or directly to VOUT (fixed) - high-impedance input (<10nA leakage). |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default - prevents input droop during cold start or brownout recovery. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak current (0.24A–2.4A); 5µA current source - determines max output current, ripple, and component size. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets disable threshold (1.10V–1.21V); triggers soft-start reset on transient - protects downstream circuitry from surge events. |
| RUN (14) | Enable/undervoltage control | 1.10V–1.25V threshold with hysteresis; <0.7V forces 3µA shutdown - enables precise input monitoring and system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 12µA while maintaining regulation - extends battery life and eliminates need for external enable logic in standby systems. |
| Programmable peak current limit | Adjusts max output current from 0.24A to 2.4A via single resistor - optimizes inductor/capacitor size and light-load efficiency for each application. |
| Internal 350mΩ P-MOSFET | Eliminates external high-side switch and gate driver - reduces solution footprint by >30% vs discrete controllers and improves reliability. |
| 100% duty cycle dropout | Maintains regulation down to VIN = VOUT - supports brownout operation in automotive stop-start and avionics emergency power scenarios. |
| Programmable OVLO and precise RUN threshold | Enables custom input voltage windows (e.g., 9V–36V for 12V automotive) with hysteresis - prevents erratic cycling during marginal supply conditions. |
Applications
| Industrial Control Supplies | Avionics Power Distribution |
|---|---|
|
Use Scenario: Regulating 24V or 28V aircraft bus to 5V/3.3V for flight control computers and sensor interfaces under extreme temperature and vibration. IC Role / Device Role / Timing Role: Primary point-of-load regulator with built-in OVLO and RUN monitoring to reject engine-start transients and ensure clean power during EMI-heavy operation. Use Value: –55°C to 150°C qualification and 76V absolute max rating enable direct connection to unregulated avionics buses without external TVS or pre-regulators. |
Use Scenario: Powering FPGA I/O banks and ADCs in airborne data acquisition units requiring low-noise, stable 1.8V from a 27V nominal supply. IC Role / Device Role / Timing Role: Adjustable-output buck converter with precise 0.800V reference and low output ripple - maintains timing margin for high-speed digital interfaces. Use Value: Programmable peak current (via ISET) allows optimization for 500mA loads, reducing inductor size and improving transient response vs fixed-current alternatives. |
| Medical Imaging Subsystems | Battery-Operated Test Equipment |
|
Use Scenario: Supplying isolated 3.3V logic rails for X-ray detector modules operating in MRI rooms with strict EMI limits and zero maintenance access. IC Role / Device Role / Timing Role: High-efficiency, low-IQ regulator with no external compensation - simplifies layout and avoids instability risks in compact, shielded enclosures. Use Value: 12µA quiescent current enables multi-year operation from sealed Li-ion packs, while Burst Mode® eliminates switching noise that could interfere with analog front-ends. |
Use Scenario: Portable oscilloscope or multimeter requiring 12V, 5V, and 3.3V rails from a single 14.4V Li-ion pack with minimal heat generation. IC Role / Device Role / Timing Role: Multi-voltage regulator platform using VPRG1/VPRG2 strapping to generate fixed outputs without external resistors - reduces BOM cost and board space. Use Value: Internal soft-start (0.8ms default) prevents input sag during cold start, ensuring reliable boot-up even with aging batteries and high ESR cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3637HMSE#PBF | Same architecture and pinout; rated for –40°C to 150°C (vs –55°C to 150°C for MP grade). | Lacks extended low-temperature qualification; unsuitable for cryogenic or space-grade deployments. | Select LTC3637MPMSE#PBF when operation below –40°C is required (e.g., arctic instrumentation, satellite payload startup). |
| LTC3637EDHC#PBF | Identical electrical specs but in 5mm × 3mm DFN package with lower θJA (43°C/W) and different pinout (NC pins present). | Requires PCB redesign due to different footprint and pin assignment; not drop-in compatible. | Choose LTC3637MPMSE#PBF for legacy MSOP layouts or when exposed pad soldering to GND is preferred over DFN thermal vias. |
Compared with LTC3637HMSE#PBF, the LTC3637MPMSE#PBF adds guaranteed operation down to –55°C for extreme-environment reliability; compared with LTC3637EDHC#PBF, it retains MSOP compatibility while delivering identical regulation performance and thermal capability within its specified temperature envelope.
Availability
LTC3637MPMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power distribution, and medical imaging subsystems requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for LTC3637MPMSE#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 full product support, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LTC3637 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for ruggedized power conversion in aerospace, defense, and industrial systems where input transients, wide temperature ranges, and long-term reliability are non-negotiable.
FAQ
What is the guaranteed operating temperature range for LTC3637MPMSE#PBF?
The LTC3637MPMSE#PBF is tested and guaranteed over a junction temperature range of –55°C to 150°C. This extended low-temperature rating distinguishes it from commercial (E), industrial (I), and high-temp (H) variants, making it suitable for cryogenic instrumentation, space-constrained outdoor equipment, and military platforms requiring cold-start capability.
How does the ISET pin configure maximum output current in LTC3637MPMSE#PBF?
The ISET pin on the LTC3637MPMSE#PBF sources a 5µA current (1µA in sleep mode) that develops a voltage across an external resistor to ground, setting the peak inductor current threshold. With RISET = 100kΩ, peak current is ~1.2A; shorting ISET to GND yields 0.24A typical, while leaving it open gives 2.4A typical - and maximum average output current is half the peak value.
Can LTC3637MPMSE#PBF operate with 100% duty cycle, and what are the implications?
Yes, the LTC3637MPMSE#PBF supports 100% duty cycle operation using its internal P-channel MOSFET, enabling regulation down to VIN = VOUT. During dropout, power dissipation rises significantly - especially below 10V input - due to increased RDS(on) and higher output current, requiring careful thermal design and derating above 85°C ambient.
What is the function of the FBO pin on LTC3637MPMSE#PBF, and how is it used?
The FBO (Feedback Comparator Output) pin on the LTC3637MPMSE#PBF is an open-drain output that pulls low when the feedback voltage falls below the 0.800V reference, indicating loss of regulation. With a 20µA internal pull-up and 70Ω pull-down, it serves as a power-good flag for system sequencing, fault logging, or enabling downstream LDOs only when the main rail is stable.
Does LTC3637MPMSE#PBF require external compensation components?
No, the LTC3637MPMSE#PBF uses a hysteretic Burst Mode® control architecture that does not require external compensation components. Its stability is inherent to the control loop design, eliminating the need for loop compensation networks and simplifying layout - a key advantage over voltage-mode or current-mode controllers requiring complex RC networks.
LTC3637MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3637MPMSE#PBF FAQ
1.How can I place an order for LTC3637MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637MPMSE#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 LTC3637MPMSE#PBF reliable?
The price and inventory of LTC3637MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637MPMSE#PBF?
LTC3637MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637MPMSE#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 LTC3637MPMSE#PBF?
For technical support, including LTC3637MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3637MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637MPMSE#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 LTC3637MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637MPMSE#PBF?
All LTC3637MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637MPMSE#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 LTC3637MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3637MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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