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Analog Devices Inc. LTC3642EMS8E-3.3#TRPBF
- Part No.:
- LTC3642EMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642EMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,440
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Product details
Overview
LTC3642EMS8E-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, synchronous step-down DC/DC converter with integrated high-side and low-side MOSFETs, delivering up to 50mA output current at a fixed 3.3V output. It operates from 4.5V to 45V input, tolerates 60V transients, and draws only 12µA quiescent current in Burst Mode® operation-enabling long battery life in industrial sensors and portable instrumentation.
For engineers reviewing the LTC3642EMS8E-3.3#TRPBF datasheet, LTC3642EMS8E-3.3#TRPBF pinout, LTC3642EMS8E-3.3#TRPBF application, or LTC3642EMS8E-3.3#TRPBF equivalent, this page delivers verified specifications, MS8E package layout, real-world load regulation behavior, and validated alternatives for 3.3V point-of-load conversion in harsh-input environments.
Technical Context
The LTC3642EMS8E-3.3#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback reference and programmable peak current limit (25–115mA via ISET). Its dual-MOSFET topology eliminates external compensation and supports 100% duty cycle for low-dropout operation down to VIN = VOUT + 0.3V.
Startup is managed by a precise RUN pin comparator (1.21V rising threshold, 110mV hysteresis) and internal 0.75ms soft-start, while protection includes undervoltage lockout (UVLO: 3.75–4.50V), overvoltage lockout (OVLO: 47–52V), and reverse-current blocking-ensuring robustness across automotive, industrial, and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial rails and unregulated battery inputs |
| Output Voltage | Fixed 3.3V ±1.2% - guaranteed over –40°C to 125°C junction temperature |
| Max Output Current | 50mA - sufficient for powering microcontrollers, sensors, and interface ICs |
| Quiescent Current | 12µA typical in Burst Mode® - enables >1-year battery life in 10µA sleep systems |
| Peak Current Limit | Programmable 25mA to 115mA via ISET resistor - allows optimization of inductor size and efficiency |
| Feedback Reference | 0.800V ±1% - enables accurate output regulation with minimal divider error sensitivity |
| Transient Tolerance | Withstands 60V input surges - protects against load dump and inductive kickback |
Pinout & Package
Package: Thermally enhanced 8-lead MSOP (MS8E), 3mm × 3mm × 0.85mm profile, exposed pad (Pin 9) tied to GND for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection to inductor; carries high di/dt switching current; requires tight layout to minimize EMI |
| VIN (Pin 2) | Main power input | Accepts 4.5V–45V; bypassed with ≥1µF ceramic capacitor directly to GND |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets trip threshold (25–115mA); open = 115mA |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor sets ramp time; floating = 0.75ms internal ramp |
| RUN (Pin 5) | Enable/disable control | 1.21V rising threshold; <0.7V forces shutdown (3µA IQ); HYST pin provides hysteresis control |
| VOUT/VFB (Pin 6) | Output voltage sense | Direct connection to 3.3V output; internal 0.8V reference enables fixed-output regulation |
| HYST (Pin 7) | Open-drain hysteresis logic | Pulled low when RUN < 1.2V; used to add external hysteresis to RUN comparator |
| GND (Pin 8 & Pin 9) | Power and signal ground | Pin 8 = signal GND; Pin 9 = exposed thermal pad - must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal control loop stability eliminates need for feedback capacitor or resistor network |
| Low dropout operation | 100% duty cycle capability maintains regulation even when VIN drops to ~3.6V |
| Burst Mode® efficiency | Maintains >80% efficiency at 100µA load - critical for always-on sensor nodes |
| Integrated power switches | On-resistance: 3.0Ω (high-side), 1.5Ω (low-side) - reduces BOM count and layout complexity |
| Precise RUN threshold with hysteresis | 1.21V enable / 1.10V disable - prevents oscillation during brown-in/brown-out conditions |
Applications
| Industrial Sensor Node Power | Automotive Body Control Module Supply |
|---|---|
Use Scenario: Powering low-power MEMS accelerometers and RS-485 transceivers in remote factory-floor sensors. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting 12V/24V vehicle or plant bus to clean logic supply. Use Value: 12µA quiescent current extends battery life to >5 years in wireless vibration monitors; 60V surge tolerance survives load-dump events. |
Use Scenario: Providing regulated 3.3V for microcontroller peripherals in door module ECUs. IC Role / Device Role / Timing Role: Secondary regulator downstream of main 5V rail, handling transient-heavy loads like LED drivers and LIN transceivers. Use Value: Internal soft-start prevents inrush-induced reset on ignition; UVLO/OVLO protect against alternator ripple and jump-start spikes. |
| Portable Medical Instrumentation | Distributed Process Control Loop |
Use Scenario: Supplying ADCs, op-amps, and BLE radios in handheld diagnostic tools powered by single Li-ion cells. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling direct 3.3V generation from 3.6V–4.2V battery range. Use Value: 100% duty cycle operation sustains regulation down to 3.6V battery voltage; low noise supports precision analog front-ends. |
Use Scenario: Powering 4–20mA transmitter circuitry in field-mounted pressure/temperature transmitters. IC Role / Device Role / Timing Role: Isolated auxiliary supply generating 3.3V for digital processing from 24V loop-powered bus. Use Value: Wide 4.5V–45V input accommodates 24V nominal with cable drop; 50mA output drives DACs, isolators, and HART modems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3643EMS8E-3.3#TRPBF | Higher 100mA output current; identical 4.5V–45V input and 12µA IQ; adds power-good flag | Required where >50mA load margin or system-level fault reporting is needed | Select LT3643 if future-proofing for higher current or adding PG monitoring; same footprint and layout |
| TPS62130ARGTR | Lower 3–17V input range; 3A output; 17µA IQ; no 60V surge rating; QFN-16 package | Suitable only for benign 12V board supplies-not for automotive or industrial transients | Choose TPS62130 only in cost-sensitive, low-voltage consumer designs where surge immunity is irrelevant |
Compared with LT3643EMS8E-3.3#TRPBF, the LTC3642EMS8E-3.3#TRPBF trades output current headroom for tighter thermal design and lower component count; versus TPS62130ARGTR, it offers superior transient robustness and ultra-low IQ but at reduced max current and higher unit cost.
Availability
LTC3642EMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3642EMS8E-3.3#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 full product support, documentation, and manufacturing continuity for all LTC parts.
The LTC3642EMS8E-3.3#TRPBF belongs to the LTC364x family of high-input-voltage, low-quiescent-current buck converters designed specifically for powering microcontrollers, sensors, and communication interfaces in harsh-input environments.
FAQ
What is the maximum input voltage the LTC3642EMS8E-3.3#TRPBF can withstand without damage?
The LTC3642EMS8E-3.3#TRPBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout that disables switching above 47–52V. This allows safe operation during 60V transients such as automotive load dump, provided the duration remains within SOA limits defined in the datasheet's Safe Operating Area curves. Continuous operation above 45V is not permitted.
Does the LTC3642EMS8E-3.3#TRPBF require external compensation components?
No, the LTC3642EMS8E-3.3#TRPBF uses a proprietary hysteretic Burst Mode® control architecture that achieves inherent loop stability without external compensation. The fixed 3.3V version needs only three external components: input capacitor, output capacitor, and inductor - eliminating feedback resistors, compensation capacitors, and associated layout sensitivity.
How does the RUN pin function on the LTC3642EMS8E-3.3#TRPBF?
The RUN pin on the LTC3642EMS8E-3.3#TRPBF enables normal operation when pulled above 1.21V (typical) and forces shutdown below 1.10V (typical), with 110mV built-in hysteresis. In shutdown, quiescent current drops to 3µA. The open-drain HYST pin (Pin 7) can be used to add external hysteresis or drive status indicators, enhancing reliability in noisy supply environments.
Can the LTC3642EMS8E-3.3#TRPBF operate with 100% duty cycle?
Yes, the LTC3642EMS8E-3.3#TRPBF supports 100% duty cycle operation, allowing regulation down to VIN ≈ VOUT + 0.3V (e.g., maintaining 3.3V output with VIN as low as ~3.6V). This low-dropout capability is essential for battery-powered applications where input voltage sags near end-of-life, and is enabled by its synchronous MOSFET architecture and adaptive gate drive.
What is the purpose of the ISET pin on the LTC3642EMS8E-3.3#TRPBF?
The ISET pin on the LTC3642EMS8E-3.3#TRPBF sources a precise 1µA current and sets the peak inductor current limit between 25mA and 115mA via an external resistor to GND. This allows designers to scale inductor and capacitor sizes for lower current applications - reducing solution footprint and improving light-load efficiency - while retaining full 50mA capability when left floating.
LTC3642EMS8E-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3642EMS8E-3.3#TRPBF FAQ
1.How can I place an order for LTC3642EMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EMS8E-3.3#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 LTC3642EMS8E-3.3#TRPBF reliable?
The price and inventory of LTC3642EMS8E-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3642EMS8E-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642EMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EMS8E-3.3#TRPBF?
LTC3642EMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EMS8E-3.3#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 LTC3642EMS8E-3.3#TRPBF?
For technical support, including LTC3642EMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3642EMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EMS8E-3.3#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 LTC3642EMS8E-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642EMS8E-3.3#TRPBF?
All LTC3642EMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EMS8E-3.3#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 LTC3642EMS8E-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642EMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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