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Analog Devices Inc. LTC3638IMSE#TRPBF
- Part No.:
- LTC3638IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3638IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 250MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,885
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Product details
Overview
LTC3638IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input 140V step-down DC/DC regulator with integrated P-channel MOSFET, delivering up to 250mA output current, operating from 4V to 140V input, featuring 12µA quiescent current in Burst Mode®, and programmable peak current limit (40–575mA). It is used in industrial control supplies and avionics power rails where high-voltage tolerance and ultra-low standby power are critical.
For engineers reviewing the LTC3638IMSE#TRPBF datasheet, LTC3638IMSE#TRPBF pinout, LTC3638IMSE#TRPBF application, or LTC3638IMSE#TRPBF equivalent, key selection considerations include its 140V absolute max input rating, thermally enhanced 16-lead MSE package with exposed GND pad, programmable fixed/adjustable output (0.8V–VIN), and parallel operation capability via FBO pin for higher current.
Technical Context
The LTC3638IMSE#TRPBF employs Burst Mode® control architecture with hysteretic feedback, enabling high efficiency across 1µA–250mA load range by alternating between active burst cycles and deep-sleep intervals. Its internal P-channel MOSFET supports 100% duty cycle dropout operation and eliminates external high-side switch requirements.
It integrates precision RUN and OVLO comparators (1.21V threshold, 110mV hysteresis), programmable soft-start via SS pin (1ms internal or capacitor-adjustable), and feedback comparator output (FBO) for master-slave current sharing. Peak current is set via ISET pin using resistor-to-GND (40–575mA range), directly determining maximum average output current (half the peak value).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct regulation from unregulated HV sources like PoE++, battery stacks, or industrial 48V/96V rails without pre-regulation. |
| Max Output Current | 250mA - determined by half the programmable peak inductor current (max 575mA); sufficient for powering microcontrollers, sensors, and interface ICs. |
| Quiescent Current | 12µA typical in Burst Mode® - ensures >1-year battery life in always-on remote sensors powered from 3.6V LiSOCl₂ cells. |
| Feedback Reference | 0.800V ±1% - provides precise output regulation; allows adjustable outputs down to 0.8V or fixed 1.8V/3.3V/5V via VPRG pins without external resistors. |
| Switch On-Resistance | 1.8Ω typical - low RDS(on) minimizes conduction loss at full load, supporting >85% efficiency at 250mA with 12V→5V conversion. |
| Package Thermal Resistance | θJA = 40°C/W - requires exposed pad soldered to PCB ground plane to sustain 125°C junction temperature under full load at 140V input. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and avionics environments; J-grade variant supports extended reliability screening. |
Pinout & Package
The LTC3638IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15), exposing a GND-connected thermal pad (Pin 17) that must be soldered to the PCB ground plane for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode cathode; carries high dv/dt switching waveform. |
| VIN (3) | Main Input Supply | Accepts 4V–140V input; requires local 1µF/250V ceramic bypass capacitor to minimize high-frequency noise and supply impedance. |
| FBO (5) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down) for synchronizing multiple LTC3638s in parallel current-sharing configurations. |
| VPRG2/VPRG1 (6,7) | Output Voltage Selection | Logic inputs configuring internal feedback divider: both GND = adjustable; VPRG1=SS/VPRG2=GND = 5V; VPRG1=GND/VPRG2=SS = 3.3V; both SS = 1.8V. |
| GND (8,16,17) | Ground Reference | Pins 8 & 16 are signal GND; Pin 17 is exposed thermal pad tied to GND - mandatory for thermal management and EMI reduction. |
| VFB (9) | Feedback Input | Compares divided output voltage to 0.8V reference; for fixed outputs, connect directly to VOUT; for adjustable, use external resistor divider. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets output ramp time (1ms per 6.25nF); internal 5µA current source enables controlled start-up and prevents input droop. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak inductor current (40–575mA); floating = max current; shorted = min current; determines max output current and ripple trade-off. |
| OVLO (12) | Overvoltage Lockout | Resistor-divider input disabling switching when VIN exceeds programmed threshold (>1.21V); ensures safe operation during transients. |
| RUN (14) | Enable/UVLO Control | Resistor-divider input enabling operation above 1.21V; disables below 1.10V; provides precise undervoltage protection and system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Enables 12µA no-load IQ while maintaining regulation - critical for energy-harvesting and battery-backed systems requiring multi-year runtime. |
| Programmable Peak Current Limit | Adjustable 40–575mA via ISET pin resistor - allows optimization of inductor size, output ripple, and light-load efficiency for specific load profiles. |
| Integrated P-Channel MOSFET | 1.8Ω RDS(on) eliminates external high-side switch and gate driver - reduces BOM count and layout complexity in high-voltage buck designs. |
| Parallel Operation Support | FBO pin enables master-slave configuration of multiple LTC3638IMSE#TRPBF units - scales output current linearly (e.g., 2× = 500mA) without external current-sharing circuitry. |
| Precision Programmable Thresholds | RUN and OVLO pins feature 1.21V trip with 110mV hysteresis - enables accurate input voltage window control for robust operation in variable-supply environments. |
Applications
| Industrial Control Power | Avionics Power Distribution |
|---|---|
Use Scenario: Providing regulated 5V/3.3V power to PLC I/O modules, fieldbus transceivers, and isolated sensor interfaces in factory automation cabinets with 24V–96V DC bus inputs. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator converting unregulated industrial rail to logic-level supplies; no timing function. Use Value: Withstands 140V transients common on long cable runs; 12µA quiescent current prevents unnecessary drain during standby; programmable OVLO avoids false trips during motor startup surges. | Use Scenario: Generating 3.3V for flight control computers and inertial measurement units (IMUs) from aircraft 28V DC or 115V AC-derived 40–120V DC intermediate bus. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator meeting DO-160 Section 22 surge immunity; operates as standalone DC/DC stage without external clock. Use Value: 125°C operating range supports engine bay proximity; 100% duty cycle dropout maintains regulation during brownouts; exposed pad ensures thermal stability at altitude. |
| Medical Diagnostic Equipment | Portable Test Instruments |
Use Scenario: Powering analog front-end ASICs and ADCs in portable ultrasound or ECG devices powered by 12V or 24V rechargeable battery packs. IC Role / Device Role / Timing Role: Efficient main power converter delivering stable low-noise supply; no clock generation or timing distribution role. Use Value: Burst Mode® extends battery life significantly vs. PWM regulators; adjustable output supports multiple ASIC voltage rails; low EMI due to constant-frequency-free architecture. | Use Scenario: Regulating 5V for microcontroller, display, and USB interface in handheld multimeters or spectrum analyzers using 9V alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: Primary DC/DC regulator enabling wide battery voltage range (6–14V) to fixed logic rail; no timing or clock synthesis function. Use Value: 4V minimum input allows full utilization of battery capacity down to near depletion; soft-start prevents display flicker during turn-on; compact MSE package saves board space. |
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 |
|---|---|---|---|
| LTC3637EMSE#TRPBF | Lower 80V max input, same 250mA output, identical pinout and features except no OVLO pin - lacks programmable overvoltage protection. | Suitable only where input transients stay below 80V; cannot replace LTC3638IMSE#TRPBF in 140V-rated systems or surge-prone environments. | Select only if input voltage is strictly bounded ≤80V and OVLO is unnecessary; not drop-in compatible for 140V applications. |
| MAX5033BASA+T | 100V max input, 250mA output, 100µA IQ, no programmable peak current or parallel operation - simpler but less efficient at light loads. | Used in cost-sensitive industrial supplies where 12µA IQ and multi-unit scaling are not required; lacks FBO and ISET flexibility. | Choose when ultra-low IQ and current sharing are not needed; verify thermal design at 100V input due to higher quiescent loss. |
Compared with LTC3637EMSE#TRPBF and MAX5033BASA+T, the LTC3638IMSE#TRPBF uniquely supports 140V operation with programmable OVLO and parallel current scaling - making it irreplaceable in high-transient avionics and utility-grade industrial systems requiring both ruggedness and scalability.
Availability
LTC3638IMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power distribution, medical diagnostic equipment, and portable test instruments requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LTC3638IMSE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3638IMSE#TRPBF belongs to ADI's Power by Linear™ high-voltage DC/DC regulator product line, designed specifically for reliable, efficient power conversion in harsh environments including industrial, aerospace, and medical systems with wide input voltage ranges.
FAQ
What is the maximum input voltage rating for the LTC3638IMSE#TRPBF?
The LTC3638IMSE#TRPBF has an absolute maximum input voltage rating of 140V, with guaranteed operation from 4V to 140V. This allows direct connection to high-voltage sources such as 96V battery strings, PoE++ injectors, or industrial DC bus systems without pre-regulation. Exceeding 140V may cause permanent damage, and operation below 4V triggers undervoltage lockout.
How does the LTC3638IMSE#TRPBF achieve ultra-low quiescent current?
The LTC3638IMSE#TRPBF achieves 12µA typical quiescent current using Burst Mode® operation: during light loads, it enters sleep cycles where the internal power switch and comparators are disabled, drawing minimal supply current while maintaining output regulation via the output capacitor. This architecture is intrinsic to the LTC3638IMSE#TRPBF design and requires no external enable control.
Can multiple LTC3638IMSE#TRPBF devices be connected in parallel for higher output current?
Yes, the LTC3638IMSE#TRPBF supports parallel operation via its FBO (Feedback Comparator Output) pin. Connecting the FBO of a master device to the VFB pins of slave LTC3638IMSE#TRPBF units forces current sharing, enabling scalable output current (e.g., two units deliver 500mA). This capability is explicitly documented for the LTC3638IMSE#TRPBF and requires no external current-sense resistors.
What output voltage options does the LTC3638IMSE#TRPBF support?
The LTC3638IMSE#TRPBF supports both fixed and adjustable outputs: fixed 1.8V, 3.3V, or 5V selected via VPRG1/VPRG2 pin strapping, or adjustable 0.8V to VIN using an external resistor divider on VFB. The 0.800V ±1% internal reference ensures tight regulation across temperature and load for all configurations of the LTC3638IMSE#TRPBF.
Is the exposed thermal pad on the LTC3638IMSE#TRPBF package required to be connected to ground?
Yes, the exposed pad (Pin 17) on the LTC3638IMSE#TRPBF is internally connected to GND and must be soldered to the PCB ground plane. This is mandatory to achieve the specified θJA = 40°C/W thermal resistance and prevent junction temperature exceedance under load. Omitting this connection risks thermal shutdown or long-term reliability degradation of the LTC3638IMSE#TRPBF.
LTC3638IMSE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3638IMSE#TRPBF FAQ
1.How can I place an order for LTC3638IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3638IMSE#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 LTC3638IMSE#TRPBF reliable?
The price and inventory of LTC3638IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3638IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3638IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3638IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3638IMSE#TRPBF?
LTC3638IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3638IMSE#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 LTC3638IMSE#TRPBF?
For technical support, including LTC3638IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3638IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3638IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3638IMSE#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 LTC3638IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3638IMSE#TRPBF?
All LTC3638IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3638IMSE#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 LTC3638IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3638IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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