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Analog Devices Inc. LTC3637IMSE#TRPBF
- Part No.:
- LTC3637IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3637IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,475
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Product details
Overview
LTC3637IMSE#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 (100mA–1A). It operates from 4V to 76V input, delivers adjustable or fixed 1.8V/3.3V/5V output, and supports 100% duty-cycle dropout operation - ideal for industrial control supplies and battery-operated systems with wide input transients.
For engineers reviewing the LTC3637IMSE#TRPBF datasheet, LTC3637IMSE#TRPBF pinout, LTC3637IMSE#TRPBF application, or LTC3637IMSE#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal package data (MSE16), real-world efficiency vs load curves, and two rigorously cross-checked alternative regulators with documented functional differences.
Technical Context
The LTC3637IMSE#TRPBF uses Burst Mode® control architecture with hysteretic feedback, enabling ultra-low 12µA sleep-mode supply current while maintaining regulation. Its internal P-channel MOSFET switch supports 100% duty cycle for low-dropout operation down to VIN – 65V under high-dV/dt conditions.
Peak inductor current is set via external resistor on ISET pin (240mA–2.4A typical), directly determining maximum average output current (up to 1A) and enabling optimization of output ripple, component size, and light-load efficiency. RUN and OVLO pins provide independent, precise undervoltage and overvoltage lockout thresholds (1.10V–1.25V) with 110mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports 24V/48V industrial rails and automotive cold-crank transients up to 76V. |
| Max Output Current | 1A average - limited by programmable peak current (max 2.4A typical), enabling robust 12V@1A or 5V@1A conversion. |
| Quiescent Current | 12µA at no load - enables multi-year battery life in always-on portable instruments and remote sensors. |
| Feedback Reference | 0.800V ±1% - allows precise output setting from 0.8V to VIN using external resistive divider. |
| Switch RDS(on) | 350mΩ - 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 startup; SS pin accepts capacitor for extended ramp. |
| Overvoltage Lockout | Programmable via OVLO pin (1.10V–1.25V threshold) - disables switching if input exceeds safe level, then resets gracefully. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm × 1.1mm, exposed pad (Pin 17) tied to GND for thermal performance. θJA = 45°C/W, θJC = 10°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; bypassed with ceramic capacitor to GND; powers internal circuitry and gate driver. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating regulation status; 20µA pull-up, 70Ω pull-down - used for power-good signaling. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or tying to SS pin - eliminates external feedback resistors. |
| GND (8,16,17) | Ground reference | Three ground connections including exposed thermal pad; all must be soldered to PCB ground plane for thermal integrity. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.800V reference; connects to output (fixed) or divider (adjustable). |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 16.5nF); internal 0.8ms default ensures controlled startup without external parts. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak current (240mA–2.4A); determines max output current, ripple, and inductor sizing. |
| OVLO (12) | Overvoltage lockout input | Voltage divider from VIN sets shutdown threshold; >1.21V disables switching; <1.10V resumes - protects downstream circuitry. |
| RUN (14) | Enable/disable control | 1.21V threshold enables operation; <0.7V forces 3µA shutdown; hysteresis prevents chatter near trip point. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads with only 12µA supply current - critical for energy harvesting and battery longevity. |
| Programmable peak current limit | Adjusts max output current from 100mA to 1A via single resistor on ISET pin - optimizes inductor/capacitor size and ripple. |
| 100% duty-cycle dropout | Enables regulation down to VIN – 65V; supports operation during deep brownouts or low-VIN battery discharge. |
| Precision RUN/OVLO comparators | 110mV hysteresis and ±10mV threshold accuracy - ensures reliable enable/disable and overvoltage protection across temperature. |
| No compensation required | Internally compensated control loop - eliminates external compensation network, reducing BOM count and design risk. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and field transmitters from unregulated 24V or 48V DC rails with transient spikes up to 76V. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V or 3.3V to microcontrollers, ADCs, and isolation interfaces. Use Value: 76V absolute max rating and programmable OVLO prevent latch-up during lightning-induced surges; 12µA quiescent current extends backup battery life. |
Use Scenario: Providing isolated auxiliary power in portable ultrasound or patient monitors operating from Li-ion batteries (8V–30V) or AC adapters. IC Role / Device Role / Timing Role: Main DC/DC converter generating 1.8V/3.3V for low-power digital logic and analog front-ends. Use Value: Adjustable output and 0.8V reference enable precise rail matching; Burst Mode® ensures silent operation and minimal self-heating near sensitive analog circuits. |
| Distributed Power Systems | Avionics |
Use Scenario: Local regulation at remote nodes in 28V aircraft or 48V telecom systems where input voltage varies widely due to cable drop and load changes. IC Role / Device Role / Timing Role: Point-of-load regulator converting 28V–76V to 5V for FPGA configuration, memory, and interface ICs. Use Value: Wide 4V–76V input range accommodates full system voltage swing; MSE16 package meets space-constrained board layouts. |
Use Scenario: Powering flight control sensors and data acquisition units in unmanned aerial vehicles (UAVs) with 28V nominal bus and cold-crank transients. IC Role / Device Role / Timing Role: High-reliability buck converter delivering 5V to inertial measurement units (IMUs) and GPS receivers. Use Value: –40°C to 125°C operating range and overtemperature shutdown (180°C) ensure operation in extreme ambient conditions; RUN pin enables system-level power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#TRPBF | 40V max input, 2A output, 2.5µA quiescent current, no programmable peak current limit. | Better suited for lower-voltage, higher-current applications (e.g., 12V→3.3V@2A); lacks 76V capability and OVLO programming. | Select when input stays below 40V and higher output current is needed; not a drop-in replacement due to different pinout and control scheme. |
| MAX20006AATP+T | 65V max input, 1A output, 15µA quiescent current, integrated soft-start and spread-spectrum, but no Burst Mode®. | Offers EMI reduction features absent in LTC3637IMSE#TRPBF; less efficient at ultra-light loads due to fixed-frequency PWM-only operation. | Prefer for noise-sensitive environments where EMI compliance is critical; avoid when >10-year battery life is required. |
Compared with LTC3637IMSE#TRPBF, LTC3642EMSE#TRPBF trades 76V input headroom for higher output current and lower quiescent current, while MAX20006AATP+T sacrifices Burst Mode® efficiency for EMI mitigation - making LTC3637IMSE#TRPBF uniquely balanced for wide-input, ultra-low-power industrial and avionics use cases.
Availability
LTC3637IMSE#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 LTC3637IMSE#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 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3637 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged industrial, medical, and aerospace applications demanding wide input range, ultra-low quiescent current, and robust protection features.
FAQ
What is the maximum input voltage rating for the LTC3637IMSE#TRPBF?
The LTC3637IMSE#TRPBF has an absolute maximum input voltage rating of 80V, with guaranteed operation from 4V to 76V. This allows it to safely regulate from 24V/48V industrial buses and withstand automotive cold-crank transients up to 76V without derating. Exceeding 80V risks permanent damage per Absolute Maximum Ratings.
How does the ISET pin configure output current on the LTC3637IMSE#TRPBF?
The ISET pin on the LTC3637IMSE#TRPBF sets peak inductor current via an external resistor to GND, with 5µA sourced internally. A 100kΩ resistor yields ~1A peak current (0.5A average), while floating ISET gives 2.4A peak (1.2A average). The LTC3637IMSE#TRPBF's max average output is half the programmed peak current, so 1A output requires ≥2A peak setting.
Does the LTC3637IMSE#TRPBF require external compensation components?
No, the LTC3637IMSE#TRPBF uses an internally compensated control loop and requires no external compensation components. This simplifies design, reduces BOM count, and eliminates tuning effort - a key advantage over many competing buck controllers that mandate RC networks for stability.
What thermal package does the LTC3637IMSE#TRPBF use, and how is it mounted?
The LTC3637IMSE#TRPBF uses the thermally-enhanced 16-lead plastic MSOP (MSE16) package with an exposed GND pad (Pin 17). For optimal thermal performance, this pad must be soldered to a PCB copper pour using multiple thermal vias - achieving θJA = 45°C/W and supporting 1A continuous output at 125°C ambient.
Can the LTC3637IMSE#TRPBF operate in 100% duty cycle mode, and what is its significance?
Yes, the LTC3637IMSE#TRPBF supports true 100% duty cycle operation using its internal P-channel high-side switch. This enables regulation when VIN approaches VOUT - critical for battery-powered systems during deep discharge (e.g., 6V input → 5V output). However, power dissipation rises sharply below 10V input due to increased RDS(on) and output current.
LTC3637IMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3637IMSE#TRPBF FAQ
1.How can I place an order for LTC3637IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637IMSE#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 LTC3637IMSE#TRPBF reliable?
The price and inventory of LTC3637IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3637IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637IMSE#TRPBF?
LTC3637IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637IMSE#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 LTC3637IMSE#TRPBF?
For technical support, including LTC3637IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3637IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3637IMSE#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 LTC3637IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3637IMSE#TRPBF?
All LTC3637IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637IMSE#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 LTC3637IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3637IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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