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Analog Devices Inc. LTC3642EMS8E-5#TRPBF
- Part No.:
- LTC3642EMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642EMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,296
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Product details
Overview
LTC3642EMS8E-5#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 5V 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 4–20mA loop-powered devices.
For engineers reviewing the LTC3642EMS8E-5#TRPBF datasheet, LTC3642EMS8E-5#TRPBF pinout, LTC3642EMS8E-5#TRPBF application, or LTC3642EMS8E-5#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world efficiency behavior across load and input voltage, confirmed alternative options for 5V/50mA high-input-voltage buck conversion, and supply-chain support details for production deployment.
Technical Context
The LTC3642EMS8E-5#TRPBF uses hysteretic Burst Mode® control with an internal 0.8V feedback reference and 5mV comparator hysteresis, enabling automatic transition between active switching bursts and ultra-low-power sleep cycles. Its peak-current-limited architecture supports programmable IPEAK (25–115mA) via external resistor on ISET, directly determining maximum average output current (≤½ × IPEAK).
Startup is controlled by a precise RUN pin threshold (1.21V rising, 1.10V falling) with 110mV hysteresis, while HYST provides open-drain logic feedback for external hysteresis extension. Internal soft-start ramps output voltage over ~0.75ms, and the device sustains safe operation during 60V input surges without latch-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive supplies; withstands 60V transients without damage. |
| Output Voltage | Fixed 5V ±1.2% - guaranteed over –40°C to 125°C junction temperature; no external feedback divider required. |
| Max Output Current | 50mA - achievable with IPEAK ≥ 100mA; actual sustained current depends on thermal design and input voltage. |
| Quiescent Current | 12µA typical in Burst Mode® - enables >1-year battery life in low-duty-cycle remote sensors. |
| Feedback Reference | 0.800V ±1% - precision reference enables accurate output regulation and stable light-load performance. |
| Switching Architecture | Synchronous buck with integrated P-channel high-side and N-channel low-side MOSFETs - eliminates external diode, improves efficiency, reduces BOM count. |
| Package Thermal Resistance | θJA = 40°C/W (MS8E) - requires exposed pad soldered to PCB ground plane for thermal integrity and EMI reduction. |
Pinout & Package
Package: 8-lead MSOP (MS8E), 3mm × 3mm × 0.85mm profile with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high dv/dt switching waveform; must minimize trace length and loop area. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local 1µF ceramic bypass capacitor to GND for stability and transient response. |
| ISET (Pin 3) | Peak current programming | 1µA current source; resistor to GND sets IPEAK from 25mA (shorted) to 115mA (open); determines max output current and component sizing. |
| SS (Pin 4) | Soft-start control | 5µA current source; capacitor to GND extends ramp time beyond internal 0.75ms; prevents input droop during startup. |
| RUN (Pin 5) | Enable/disable control | Active-high logic: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); hysteresis ensures clean power sequencing. |
| VOUT/VFB (Pin 6) | Output voltage sense / feedback | Internally connected to 5V output; for fixed versions, serves as regulated output node and feedback point simultaneously. |
| HYST (Pin 7) | Run hysteresis indicator | Open-drain output pulled low when RUN < 1.2V; used to bias external resistor network for adjustable RUN hysteresis. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Common return for all circuits; exposed pad must be soldered to large PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Internal hysteretic control eliminates need for external compensation network - reduces design time and component count. |
| Low dropout operation | 100% duty cycle capability allows VOUT regulation even when VIN drops to within ~100mV of 5V - critical for brownout resilience. |
| Adjustable peak current limit | Resistor-programmable IPEAK (25–115mA) enables optimization of inductor size, input/output ripple, and efficiency vs. load profile. |
| Precise RUN pin threshold | 1.21V enable threshold with 110mV hysteresis ensures reliable, noise-immune power sequencing without external comparators. |
| Thermally enhanced MS8E package | 3mm × 3mm MSOP with exposed GND pad achieves θJA = 40°C/W - supports 50mA output in compact industrial layouts without heatsinks. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node |
|---|---|
Use Scenario: Powering analog front-end, ADC, and loop driver from 24V DC supply in hazardous-area field instruments. IC Role / Device Role / Timing Role: Primary 5V regulator supplying precision analog circuitry and digital controller; operates continuously under varying loop load. Use Value: 12µA quiescent current minimizes burden voltage drop across loop resistor; 60V surge tolerance protects against wiring faults and lightning-induced transients. |
Use Scenario: Battery-powered wireless sensor collecting temperature, pressure, or vibration data in factory automation systems. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling multi-year operation on primary lithium thionyl chloride cells. Use Value: Burst Mode® operation maintains >85% efficiency down to 100µA load; wide 4.5V–45V input accommodates aging battery and energy-harvesting inputs. |
| Distributed Power System | Automotive Body Control Module |
Use Scenario: Local 5V rail generation from 12V/24V backbone bus in modular PLC backplanes or distributed I/O systems. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated, low-noise 5V for microcontrollers and interface ICs. Use Value: Integrated MOSFETs and no-compensation design reduce board space and layout complexity; MS8E package fits dense backplane layouts. |
Use Scenario: Powering CAN transceivers, LIN interfaces, and small MCUs in non-safety-critical automotive subsystems (e.g., seat controls, lighting). IC Role / Device Role / Timing Role: Secondary regulator deriving stable 5V from vehicle battery (subject to load dump and cold-crank conditions). Use Value: 60V transient tolerance meets ISO 7637-2 Pulse 1/2/5a requirements; precise RUN threshold enables controlled wake-up from sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V/50mA high-input-voltage buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8E#TRPBF | 42V max input, 2A output, Silent Switcher® architecture; higher IQ (2.5µA) but superior EMI performance. | Overkill for 50mA loads; preferred where EMI-sensitive analog or RF sections coexist on same PCB. | Select if board-level EMI compliance (CISPR 25 Class 5) is mandatory and cost premium is acceptable. |
| TPS62840DGFR | 6V max input, 1A output, 0.35µA IQ; lacks high-voltage capability and transient protection. | Only suitable for low-voltage battery systems (e.g., single-cell Li-ion); cannot replace LTC3642EMS8E-5#TRPBF in 24V industrial rails. | Consider only for new designs with ≤6V input and sub-1µA quiescent requirement; not a functional substitute in high-voltage applications. |
Compared with LT8609SIS8E#TRPBF and TPS62840DGFR, the LTC3642EMS8E-5#TRPBF uniquely balances 45V operating range, 60V surge tolerance, 12µA quiescent current, and minimal external component count - making it optimal for space-constrained, high-reliability industrial and automotive auxiliary rails where input voltage variability and longevity are critical.
Availability
LTC3642EMS8E-5#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA loop transmitters, and automotive body electronics requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3642EMS8E-5#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 legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3642 product line was designed specifically for high-input-voltage, low-quiescent-current step-down regulation in harsh environments - targeting applications where reliability, surge immunity, and battery longevity outweigh raw output current capability.
FAQ
What is the maximum continuous output current of the LTC3642EMS8E-5#TRPBF?
The LTC3642EMS8E-5#TRPBF is rated for up to 50mA continuous output current under typical thermal conditions (θJA = 40°C/W, TA ≤ 85°C). This assumes proper PCB layout with the exposed pad soldered to a thermal plane and use of recommended external components (e.g., 150µH inductor, 10µF output capacitor). At higher ambient temperatures or with reduced copper area, derating is required per thermal calculations using PD = (VIN – 5V) × IOUT.
Does the LTC3642EMS8E-5#TRPBF require an external feedback resistor network?
No, the LTC3642EMS8E-5#TRPBF does not require an external feedback resistor network. It is a fixed 5V output version - Pin 6 (VOUT/VFB) is internally connected to the regulated 5V rail. The 0.8V internal reference is used exclusively for regulation; no external divider is needed, simplifying layout and reducing component count compared to adjustable variants.
How does the ISET pin affect performance in the LTC3642EMS8E-5#TRPBF?
The ISET pin on the LTC3642EMS8E-5#TRPBF programs the peak inductor current limit from 25mA (shorted to GND) to 115mA (left open). Since maximum average output current ≈ ½ × IPEAK, setting ISET to open configures the part for full 50mA capability. Reducing IPEAK lowers inductor and capacitor stress, reduces ripple, and improves light-load efficiency - useful when full 50mA is not required.
Can the LTC3642EMS8E-5#TRPBF survive automotive load dump events?
Yes, the LTC3642EMS8E-5#TRPBF is explicitly designed to survive automotive load dump transients: its absolute maximum VIN rating is 60V, and its internal overvoltage lockout activates at ~47–50V, clamping operation before damage occurs. When subjected to ISO 7637-2 Pulse 5a (75V/400ms), the device remains undamaged and resumes regulation once VIN returns within 4.5V–45V - provided external input capacitance and layout meet recommended guidelines.
What is the purpose of the HYST pin on the LTC3642EMS8E-5#TRPBF?
The HYST pin on the LTC3642EMS8E-5#TRPBF is an open-drain logic output that pulls low whenever the RUN pin voltage falls below 1.2V. It is not a hysteresis adjustment input - rather, it signals RUN status and can be used to drive external circuitry (e.g., bias a resistor divider on RUN) to increase effective hysteresis beyond the internal 110mV. This enables robust power sequencing in noisy industrial environments without adding comparators.
LTC3642EMS8E-5#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):
- 5V
- 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-5#TRPBF FAQ
1.How can I place an order for LTC3642EMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EMS8E-5#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-5#TRPBF reliable?
The price and inventory of LTC3642EMS8E-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642EMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EMS8E-5#TRPBF?
LTC3642EMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EMS8E-5#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-5#TRPBF?
For technical support, including LTC3642EMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LTC3642EMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EMS8E-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642EMS8E-5#TRPBF?
All LTC3642EMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EMS8E-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642EMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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