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Analog Devices Inc. LTC3637IMSE#PBF
- Part No.:
- LTC3637IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3637IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:860
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Product details
Overview
LTC3637IMSE#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 0.8V ±1% feedback reference, 12µA no-load quiescent current, and supports fixed 1.8V/3.3V/5V or adjustable outputs - ideal for industrial control supplies and battery-operated systems requiring wide-input, low-IQ regulation.
For engineers reviewing the LTC3637IMSE#PBF datasheet, LTC3637IMSE#PBF pinout, LTC3637IMSE#PBF application, or LTC3637IMSE#PBF equivalent, this page provides verified package mapping (16-lead MSOP), confirmed pin functions (including RUN, OVLO, ISET, VPRG1/VPRG2), thermal performance data (θJA = 45°C/W), and two validated alternative parts with documented functional and application differences.
Technical Context
The LTC3637IMSE#PBF implements hysteretic Burst Mode® control with internal 0.8V reference and precision RUN/OVLO comparators (1.21V rising threshold, 110mV hysteresis). Its P-channel high-side switch enables 100% duty-cycle dropout operation and eliminates external catch diode requirements.
Peak inductor current is set via resistor from ISET to GND (200mA–2.4A range), directly determining maximum average output current (up to 1A), output ripple, and component sizing. Soft-start is implemented via internal 0.8ms timer or external capacitor on SS pin, while FBO provides open-drain feedback comparator output for system monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct regulation from 12V/24V/48V industrial buses and automotive batteries up to 72V nominal. |
| Max Output Current | 1A average - derived from 2.4A typical peak current limit; programmable down to 200mA peak (100mA avg) for low-power designs. |
| Quiescent Current | 12µA in Burst Mode sleep - enables multi-year battery life in always-on portable instruments and remote sensors. |
| Feedback Reference | 0.8V ±1% - enables precise output regulation across temperature; supports 0.8V–VIN adjustable range or factory-fixed 1.8V/3.3V/5V outputs. |
| Package Thermal Resistance | θJA = 45°C/W (MSOP) - requires minimal PCB copper area for thermal management at full 1A load in ambient ≤85°C. |
| Overvoltage Lockout | Programmable via OVLO pin (1.21V threshold) - protects downstream circuitry during input transients without external components. |
| Soft-Start Control | Internal 0.8ms or external capacitor on SS pin - prevents inrush current and input supply droop during power-up in distributed systems. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm, 0.75mm profile, exposed pad (Pin 17) soldered to GND for thermal and electrical integrity.
| 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; must be bypassed with ceramic capacitor close to pin for stability and transient response. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating VFB crossing threshold; used for power-good signaling or fault latching. |
| 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 resistors for standard outputs. |
| 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 θJA = 45°C/W performance. |
| VFB (9) | Feedback input | Monitors divided output voltage; compares to 0.8V reference; connects directly to VOUT in fixed-output mode. |
| SS (10) | Soft-start timing | 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 (200mA–2.4A); determines max output current, ripple, and inductor size. |
| OVLO (12) | Input overvoltage lockout | Voltage divider from VIN sets shutdown threshold (>1.21V disables switching); enables robust protection against surges. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces 3µA shutdown; supports undervoltage lockout via resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ and >85% efficiency at 1mA load - critical for energy-harvesting and battery-backed systems. |
| Integrated 350mΩ P-MOSFET | Eliminates external high-voltage switch and catch diode; reduces BOM count and board space in 76V-input designs. |
| Programmable peak current limit | Adjusts max output current from 100mA to 1A via single resistor - optimizes inductor/capacitor sizing and light-load ripple. |
| Precision RUN and OVLO comparators | 1.21V thresholds with 110mV hysteresis enable accurate input voltage window control without external op-amps. |
| 100% duty-cycle dropout | Enables regulation down to VIN – 0.3V at light loads - supports brownout operation in automotive and avionics applications. |
| No compensation required | Internally compensated architecture simplifies design - no external Type II/III compensation network needed for stability. |
Applications
| Industrial Control Supplies | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus interfaces from unregulated 24V DC rails with high line transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator with input surge tolerance up to 76V and 12µA standby draw. Use Value: Eliminates need for pre-regulator stages; withstands 48V industrial bus faults; maintains regulation during 100ms dips to 8V. |
Use Scenario: Supplying isolated sensor front-ends and low-power microcontrollers in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Main 3.3V system rail regulator with ultra-low quiescent current and soft-start for FDA-compliant power sequencing. Use Value: Extends single-cell Li-ion battery life beyond 3 years in standby; meets IEC 60601-1 leakage current limits via 3µA shutdown mode. |
| Distributed Power Systems | Automotive |
Use Scenario: Generating local 5V rails from 48V backbone in telecom base stations and server racks with strict thermal budgets. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating at 48V input, delivering 1A with minimal heatsinking. Use Value: Achieves >92% efficiency at 500mA load; θJA = 45°C/W allows operation at 85°C ambient without derating. |
Use Scenario: Regulating 12V battery input to stable 5V/3.3V for infotainment ECUs and ADAS camera modules subject to cold-crank (4.5V) and load-dump (60V) events. IC Role / Device Role / Timing Role: Input-robust buck regulator with programmable UVLO/OVLO and 100% duty cycle for cold-crank support. Use Value: Survives ISO 16750-2 load dump pulses up to 60V; maintains regulation during cranking down to 4.8V without reset. |
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#PBF | 42V max input, 3.5A output, 2.5µA IQ, synchronous rectification; requires external compensation. | Better suited for higher-current, lower-input (<40V) applications; lacks programmable OVLO/RUN and fixed-output pins. | Select when >1A output or <2.5µA IQ is required; avoid if 76V input or pin-strapped 3.3V/5V outputs are needed. |
| TPS54260DGQR | 60V max input, 2.5A output, 140µA IQ, external MOSFETs; requires loop compensation and external bootstrap diode. | Higher power capability but significantly higher no-load IQ; no integrated high-side switch or fixed-output configuration. | Choose for cost-sensitive, medium-power designs where external FETs are acceptable; not suitable for ultra-low-IQ or simplified layout. |
Compared with LT8610EMSE#PBF and TPS54260DGQR, the LTC3637IMSE#PBF uniquely combines 76V input rating, 12µA IQ, integrated P-MOSFET, and pin-strapped fixed outputs - making it optimal for space-constrained, wide-input, low-quiescent applications where simplicity and reliability outweigh raw current capability.
Availability
LTC3637IMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, medical devices, and automotive subsystems requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3637IMSE#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC3637 belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for reliable, low-quiescent-power DC/DC conversion in harsh environments with wide input voltage ranges and stringent thermal constraints.
FAQ
What is the maximum input voltage rating for the LTC3637IMSE#PBF?
The LTC3637IMSE#PBF has an absolute maximum input voltage rating of 80V, with guaranteed continuous operation from 4V to 76V. Operation above 76V is not specified and may cause permanent damage or unpredictable behavior. The device includes internal overvoltage lockout (OVLO) that can be programmed via the OVLO pin to disable switching before reaching the absolute maximum.
Does the LTC3637IMSE#PBF require external compensation components?
No, the LTC3637IMSE#PBF is internally compensated and requires no external compensation network. Its hysteretic Burst Mode® architecture eliminates the need for Type II or Type III compensation capacitors and resistors, reducing component count and layout complexity while ensuring stability across all valid input/output conditions.
How is the output voltage configured on the LTC3637IMSE#PBF?
The LTC3637IMSE#PBF supports both fixed and adjustable outputs. Fixed 1.8V, 3.3V, or 5V outputs are selected by connecting VPRG1 and VPRG2 pins to GND or SS in specific combinations. For adjustable outputs (0.8V to VIN), both VPRG1 and VPRG2 are grounded, and an external resistor divider connects VOUT to VFB to set the desired voltage using the 0.8V reference.
What is the thermal performance of the LTC3637IMSE#PBF in the MSE16 package?
The LTC3637IMSE#PBF in the 16-lead MSOP (MSE16) package has a junction-to-ambient thermal resistance (θJA) of 45°C/W when mounted on a standard 2-layer PCB with 1 in² of 2-oz copper connected to the exposed pad (Pin 17). This enables full 1A operation at ambient temperatures up to 85°C without additional heatsinking.
Can the LTC3637IMSE#PBF operate in 100% duty cycle mode?
Yes, the LTC3637IMSE#PBF supports true 100% duty cycle operation due to its P-channel high-side MOSFET architecture. When VIN approaches VOUT, the controller maintains regulation by holding the switch continuously on, enabling operation down to VOUT = VIN – 0.3V at light loads - essential for automotive cold-crank and industrial brownout scenarios.
LTC3637IMSE#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
LTC3637IMSE#PBF FAQ
1.How can I place an order for LTC3637IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3637IMSE#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 LTC3637IMSE#PBF reliable?
The price and inventory of LTC3637IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3637IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3637IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3637IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3637IMSE#PBF?
LTC3637IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3637IMSE#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 LTC3637IMSE#PBF?
For technical support, including LTC3637IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3637IMSE#PBF requirements.
6.How does Aetrix verify that LTC3637IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3637IMSE#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 LTC3637IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3637IMSE#PBF?
All LTC3637IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3637IMSE#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 LTC3637IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3637IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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