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Analog Devices Inc. LTC3642EMS8E#TRPBF
- Part No.:
- LTC3642EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,768
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Product details
Overview
LTC3642EMS8E#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 from a 4.5V–45V input. It operates in Burst Mode® with 12µA no-load quiescent current, features programmable peak current limit (25mA–115mA), and maintains regulation during 60V input transients. It is used in industrial control supplies and battery-operated instrumentation requiring ultra-low standby power.
For engineers reviewing the LTC3642EMS8E#TRPBF datasheet, LTC3642EMS8E#TRPBF pinout, LTC3642EMS8E#TRPBF application, or LTC3642EMS8E#TRPBF equivalent, key selection criteria include its wide input range, internal synchronous switches, precise RUN pin threshold (1.21V rising), 0.8V feedback reference, and thermally enhanced MS8E package for compact, high-reliability power conversion in harsh environments.
Technical Context
The LTC3642EMS8E#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback comparator and 5mV hysteresis, enabling automatic transition between active burst cycles and ultra-low-power sleep mode. Its peak current limit is set via external resistor on ISET pin, directly determining maximum inductor current and average output capability.
Startup is managed by a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and dual soft-start: internal 0.75ms ramp plus optional external capacitor on SS pin. Input protection includes undervoltage lockout (4.35V max falling) and overvoltage lockout (47V min rising), allowing safe operation up to 60V transient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide industrial and automotive supply rails; tolerates 60V transients without damage. |
| Output Current | Up to 50mA - maximum continuous load at regulated output; limited by peak current setting and thermal design. |
| Quiescent Current | 12µA typical at no load - enables multi-year battery life in always-on sensor nodes and portable instruments. |
| Feedback Reference | 0.800V ±8mV - precise internal voltage reference enabling accurate output regulation across temperature. |
| Peak Current Limit | 25mA to 115mA (programmable) - sets maximum inductor current; determines output capability and component sizing. |
| Run Pin Threshold | 1.21V rising / 1.10V falling - provides clean, hysteresis-controlled enable/disable with external divider flexibility. |
| Package | MS8E (8-lead MSOP, 3mm × 3mm, 0.75mm height) - thermally enhanced with exposed GND pad for efficient heat dissipation. |
Pinout & Package
Package: MS8E - 8-lead plastic MSOP with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for optimal thermal and electrical performance. θJA = 40°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; ties to drains of internal high-side P-MOSFET and low-side N-MOSFET. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local ceramic bypass capacitor to GND for stability and EMI reduction. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current from 25mA (shorted) to 115mA (open). |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor to GND extends startup ramp beyond internal 0.75ms default. |
| RUN (Pin 5) | Enable/disable control | Logic-level input: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ). |
| VOUT/VFB (Pin 6) | Output feedback | Connects to regulated output (fixed versions) or resistive divider (adjustable version) for 0.8V reference comparison. |
| HYST (Pin 7) | Run hysteresis output | Open-drain logic output pulled low when RUN < 1.2V; used to enhance RUN pin hysteresis with external resistor. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Enables 12µA no-load quiescent current while maintaining tight output regulation across load range. |
| Integrated synchronous switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity. |
| Programmable peak current limit | Allows optimization of inductor size, input/output capacitance, and efficiency for specific load requirements. |
| Precision RUN pin with hysteresis | Ensures controlled, bounce-free start-up and shutdown; HYST pin enables adjustable hysteresis for noisy supply monitoring. |
| No compensation required | Internal control loop is inherently stable with standard external components-no external compensation network needed. |
| Low dropout operation | Supports 100% duty cycle, enabling output regulation even when VIN approaches VOUT (e.g., 5V out from 5.5V input). |
Applications
| Industrial Control Supplies | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering analog sensor transmitters in PLC I/O modules and field-mounted process controllers. IC Role / Device Role / Timing Role: Primary 5V or 3.3V local regulator converting 24V DC plant bus to isolated sensor supply. Use Value: Ultra-low 12µA quiescent current prevents loading of current-loop-powered devices; 60V surge tolerance ensures robustness in electrically noisy plants. |
Use Scenario: Providing stable bias for op-amps and DACs in 4–20mA transmitter front-ends. IC Role / Device Role / Timing Role: Precision, low-noise local supply for current-sense amplifiers and voltage references. Use Value: 0.8V feedback reference and tight line/load regulation (<0.1%) maintain loop accuracy; MS8E package fits space-constrained transmitter PCBs. |
| Portable Instruments | Battery-Operated Devices |
Use Scenario: Power management in handheld multimeters, gas detectors, and portable data loggers. IC Role / Device Role / Timing Role: Main step-down regulator converting single Li-ion (3.0–4.2V) or dual AA (2.4–3.6V) to 3.3V system rail. Use Value: 12µA sleep current extends battery life; programmable peak current allows use of small inductors for minimal board area. |
Use Scenario: Long-life power conversion in remote wireless sensors and IoT edge nodes. IC Role / Device Role / Timing Role: Always-on regulator supplying MCU, RF transceiver, and sensor interface from primary battery. Use Value: Wide 4.5V–45V input accommodates varied battery chemistries and energy harvesting sources; 100% duty cycle supports low-VIN brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-quiescent-current step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | Higher 2A output current, but 100µA typical IQ; requires external MOSFETs; 4.95V–32V input range. | Targeted at solar battery charging; lacks programmable peak current and 60V surge tolerance. | Choose LT3652IMSE#TRPBF only if >50mA output or battery charge management is required; not drop-in. |
| TPS62130ARGTR | Lower 3.5V–17V input range; 17µA IQ; fixed 3.3V/5V outputs only; no RUN hysteresis or ISET programming. | Optimized for consumer portables; lacks industrial-grade UVLO/OVLO and transient protection. | Use TPS62130ARGTR where cost and footprint are critical and input stays within 17V; not suitable for 24V+ industrial rails. |
Compared with LT3652IMSE#TRPBF and TPS62130ARGTR, the LTC3642EMS8E#TRPBF uniquely combines 60V surge tolerance, 12µA quiescent current, programmable peak current, and precision RUN control in a thermally enhanced MSOP-making it optimal for space-constrained, battery-sensitive industrial power nodes.
Availability
LTC3642EMS8E#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3642EMS8E#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 the LTC portfolio.
The LTC3642EMS8E#TRPBF belongs to Linear's high-voltage DC/DC converter family, designed specifically for reliable, low-power regulation in industrial, instrumentation, and automotive subsystems where wide input range and ultra-low IQ are critical.
FAQ
What is the maximum input voltage the LTC3642EMS8E#TRPBF can withstand without damage?
The LTC3642EMS8E#TRPBF has an absolute maximum input rating of 60V and includes internal overvoltage lockout that disables switching above 47V (min). This allows the device to survive transient surges up to 60V while protecting downstream circuitry-critical in industrial 24V and automotive 12V/24V systems where load dump events occur.
Does the LTC3642EMS8E#TRPBF require external compensation components?
No, the LTC3642EMS8E#TRPBF uses an internally compensated hysteretic control architecture and requires no external compensation network. Stability is ensured with only three external components for fixed-output versions: input capacitor, output capacitor, and inductor-reducing design risk and board area.
How is the output voltage set for the LTC3642EMS8E#TRPBF?
The LTC3642EMS8E#TRPBF is offered in fixed 3.3V and 5V versions (e.g., LTC3642EMS8E-3.3#TRPBF); the part number LTC3642EMS8E#TRPBF itself is the adjustable version. For adjustable operation, an external resistive divider connects VOUT to VFB to scale the output so the feedback pin sees exactly 0.800V at regulation.
What is the purpose of the HYST pin on the LTC3642EMS8E#TRPBF?
The HYST pin on the LTC3642EMS8E#TRPBF is an open-drain output pulled low when the RUN pin voltage falls below 1.2V. It enables external hysteresis enhancement-e.g., by connecting HYST to RUN through a resistor-allowing precise, user-defined turn-on/turn-off thresholds for supply monitoring in noisy environments.
Can the LTC3642EMS8E#TRPBF operate with 100% duty cycle?
Yes, the LTC3642EMS8E#TRPBF supports 100% duty cycle operation, allowing the output voltage to remain regulated even when the input voltage drops close to the output level (e.g., VIN = 5.2V → VOUT = 5V). This feature ensures uninterrupted power during brownout conditions common in battery-fed systems.
LTC3642EMS8E#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 45V
- 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#TRPBF FAQ
1.How can I place an order for LTC3642EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EMS8E#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#TRPBF reliable?
The price and inventory of LTC3642EMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EMS8E#TRPBF?
LTC3642EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EMS8E#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#TRPBF?
For technical support, including LTC3642EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3642EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642EMS8E#TRPBF?
All LTC3642EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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