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Analog Devices Inc. LTC3638MPMSE#TRPBF
- Part No.:
- LTC3638MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3638MPMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 250MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,282
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Product details
Overview
LTC3638MPMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input-range step-down DC/DC regulator with integrated 1.8Ω P-channel MOSFET switch, delivering up to 250mA output current from 4V to 140V input. It features 12µA no-load quiescent current, programmable peak current limit (40–575mA), and 0.8V ±1% feedback reference, enabling robust power conversion in avionics and industrial control systems.
For engineers reviewing the LTC3638MPMSE#TRPBF datasheet, LTC3638MPMSE#TRPBF pinout, LTC3638MPMSE#TRPBF application, or LTC3638MPMSE#TRPBF equivalent, key selection considerations include its –55°C to 150°C operating junction temperature range, programmable input overvoltage lockout (OVLO), precise RUN pin threshold (1.17–1.25V), Burst Mode® operation for ultra-low light-load efficiency, and parallelability via FBO pin for higher-current designs.
Technical Context
The LTC3638MPMSE#TRPBF implements a hysteretic Burst Mode® control architecture with internal P-channel MOSFET switch, enabling 100% duty-cycle dropout operation and inherent short-circuit protection. Its feedback comparator monitors VFB against a precision 0.8V reference and triggers burst cycles when voltage falls 5mV below threshold.
Peak current is set by an external resistor on ISET (40–575mA range), directly determining maximum average output current (half the peak value). The RUN and OVLO pins provide independent, programmable input voltage monitoring with 110mV hysteresis each, while FBO enables master-slave current sharing across multiple units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports direct regulation from unregulated HV rails including 48V telecom, 110V AC-derived supplies, and avionics 115VAC rectified buses. |
| Output Current | Up to 250mA - maximum average load current, limited to half the programmed peak inductor current (e.g., 500mA peak → 250mA avg). |
| Quiescent Current | 12µA typical in sleep mode - enables multi-year battery life in always-on remote sensors and low-power instrumentation. |
| Feedback Reference | 0.800V ±1% - high-precision internal reference enabling accurate adjustable outputs from 0.8V to VIN using external resistive dividers. |
| Operating Temp Range | –55°C to 150°C junction - qualified for extended-temperature military, aerospace, and downhole industrial applications. |
| Switch RDS(on) | 1.8Ω typical - low on-resistance P-channel MOSFET minimizes conduction loss at high input voltages and moderate loads. |
| Burst Mode Frequency | Variable (50–200kHz typical) - frequency scales with input/output voltage, inductance, and peak current; no external compensation required. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE) with thermally enhanced exposed pad (Pin 17 = GND); four pins omitted (1, 2, 4, 13) - total of 12 functional terminals. Exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Drain of internal P-MOSFET; connects to inductor and catch diode cathode; carries full switching current and voltage swing up to 140V. |
| VIN (3) | Main input supply | High-voltage input rail connection; supports 4V–140V operation; requires local 1µF/250V ceramic bypass capacitor to GND. |
| FBO (5) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) used to synchronize multiple LTC3638s in parallel for >250mA total output. |
| VPRG1 / VPRG2 (6,7) | Output voltage selection | Logic inputs configuring internal feedback divider: both grounded = adjustable; tied to SS = 1.8V/3.3V/5V fixed outputs. |
| GND (8,16,17) | Ground reference | Three dedicated ground connections including exposed thermal pad (Pin 17); all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output voltage against 0.8V reference; for fixed outputs, connected directly to VOUT; for adjustable, tied to external divider. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 6.25nF); internal 5µA current source enables controlled startup and recovery from transients. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (40–575mA); floating = max current; grounded = min current; enables ripple/efficiency tradeoff. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets disable threshold (1.21V rising); prevents switching during input surges; triggers soft-start reset on recovery. |
| RUN (14) | Enable/disable control | Resistive divider from VIN sets UVLO threshold (1.21V rising, 1.10V falling); <0.7V forces shutdown (1.4µA IQ); enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 12µA in sleep mode enables >10-year battery life in always-on IoT sensors and portable medical devices. |
| Wide 4V–140V input range | Eliminates need for pre-regulators in industrial automation, railway, and avionics power systems with highly variable input sources. |
| Programmable peak current limit | Adjustable 40–575mA via single resistor on ISET, optimizing inductor size, output ripple, and efficiency for specific load profiles. |
| Parallel operation support | FBO pin allows master-slave configuration of multiple LTC3638MPMSE#TRPBF units to scale output current linearly without external controllers. |
| Robust protection suite | Integrated undervoltage lockout (UVLO), overvoltage lockout (OVLO), thermal shutdown (~180°C), and 100% duty-cycle dropout operation. |
Applications
| Avionics Power Supply | Industrial Control System |
|---|---|
|
Use Scenario: Regulating 115VAC-derived 140V DC bus to 5V/250mA for flight data recorder logic and sensor interfaces in harsh thermal environments. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator providing isolated downstream power domains with precise RUN/OVLO thresholds for fault containment. Use Value: –55°C to 150°C rating ensures reliable startup and operation across aircraft altitude and ambient temperature extremes without derating. |
Use Scenario: Converting 48V DC distribution rail to 3.3V/250mA for PLC I/O modules and fieldbus interface circuitry in factory automation cabinets. IC Role / Device Role / Timing Role: High-voltage buck converter with programmable OVLO preventing damage during 48V bus transients and brownouts. Use Value: 12µA quiescent current minimizes standby power draw across hundreds of distributed modules, reducing total cabinet heat load. |
| Downhole Oilfield Instrumentation | Portable Medical Diagnostic Device |
|
Use Scenario: Powering microcontroller, MEMS pressure sensor, and RF telemetry from 120V DC battery stack in high-temperature wellbore logging tools. IC Role / Device Role / Timing Role: Primary HV-to-LV regulator with thermal shutdown and 150°C junction rating enabling operation at 175°C ambient with appropriate derating. Use Value: Internal 1.8Ω MOSFET eliminates external high-voltage switch, reducing BOM count and PCB area in space-constrained tool housings. |
Use Scenario: Generating stable 1.8V/250mA from primary Li-ion battery (3.0–4.2V) or external 12V adapter in handheld ultrasound probe electronics. IC Role / Device Role / Timing Role: Efficient buck converter supporting dual-input operation with seamless switchover via RUN pin control and low-IQ sleep mode. Use Value: Adjustable output and 0.8V reference allow precise core voltage scaling for low-power ARM Cortex-M processors, extending battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3638HMSE#TRPBF | Same silicon, rated for –40°C to 150°C junction; lacks extended low-temp capability. | Suitable for industrial and automotive applications but not military-grade cold-start requirements. | Select when –55°C operation is unnecessary and cost optimization is prioritized. |
| LTC3638IMSE#TRPBF | Same silicon, rated for –40°C to 125°C junction; lower temperature grade with reduced test coverage. | Appropriate for commercial/industrial equipment operating within standard ambient ranges. | Choose for cost-sensitive volume production where extended temperature range is not required. |
Compared with LTC3638HMSE#TRPBF and LTC3638IMSE#TRPBF, the LTC3638MPMSE#TRPBF provides unique qualification for operation down to –55°C, making it the only option among these three for military, aerospace, and extreme-environment applications requiring guaranteed functionality at cryogenic temperatures.
Availability
LTC3638MPMSE#TRPBF is available at Aetrix Electronics and suitable for avionics power supplies, downhole instrumentation, and industrial control systems requiring stable component supply across extended temperature and high-reliability operational lifecycles.
Supply support for LTC3638MPMSE#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 analog and power management product lines with rigorous military- and aerospace-grade qualification standards.
The LTC3638MPMSE#TRPBF belongs to Linear's high-voltage monolithic DC/DC regulator family, designed specifically for direct conversion from unregulated HV sources in safety-critical and thermally demanding applications.
FAQ
What is the minimum input voltage for LTC3638MPMSE#TRPBF to regulate?
The LTC3638MPMSE#TRPBF begins regulation at 4V input, with undervoltage lockout (UVLO) releasing at 3.5V (typical) when VIN rises. Below this threshold, the device remains disabled with only 1.4µA shutdown current. This 4V minimum enables compatibility with partially discharged 5V or 12V battery systems and low-voltage auxiliary rails.
How does the LTC3638MPMSE#TRPBF achieve 12µA quiescent current?
The LTC3638MPMSE#TRPBF achieves 12µA quiescent current through Burst Mode® operation: during light loads, it enters sleep cycles where the power switch, current comparators, and most bias circuits are disabled. Only essential monitoring circuitry remains active, drawing minimal current while maintaining output regulation via energy stored in COUT.
Can LTC3638MPMSE#TRPBF operate with 100% duty cycle?
Yes, the LTC3638MPMSE#TRPBF supports 100% duty cycle operation using its internal P-channel MOSFET switch. When VIN approaches VOUT, the controller maximizes on-time to sustain regulation - critical for maintaining output during brownout conditions in industrial and avionics power systems.
What is the function of the FBO pin on LTC3638MPMSE#TRPBF?
The FBO (Feedback Comparator Output) pin on LTC3638MPMSE#TRPBF is an open-drain output that signals when the internal feedback comparator trips. Connecting FBO of a master LTC3638MPMSE#TRPBF to VFB of slave units synchronizes their burst cycles, enabling precise current sharing and scalable output current without external controllers or complex timing circuits.
Is LTC3638MPMSE#TRPBF pin-compatible with other LTC3638 variants?
Yes, LTC3638MPMSE#TRPBF is pin-compatible with all other LTC3638 variants (E, I, H grades) in the 16-lead MSE package. Differences are limited to temperature grading, test coverage, and qualification - electrical characteristics, pin functions, and PCB layout are identical across the family.
LTC3638MPMSE#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):
- 140V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 140V
- Current - Output:
- 250mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3638MPMSE#TRPBF FAQ
1.How can I place an order for LTC3638MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3638MPMSE#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 LTC3638MPMSE#TRPBF reliable?
The price and inventory of LTC3638MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3638MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3638MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3638MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3638MPMSE#TRPBF?
LTC3638MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3638MPMSE#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 LTC3638MPMSE#TRPBF?
For technical support, including LTC3638MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3638MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3638MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3638MPMSE#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 LTC3638MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3638MPMSE#TRPBF?
All LTC3638MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3638MPMSE#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 LTC3638MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3638MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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