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Analog Devices Inc. LTC3642EMS8E#PBF
- Part No.:
- LTC3642EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642EMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,854
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Product details
Overview
LTC3642EMS8E#PBF 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 (25–115mA), and uses an internal 0.8V feedback reference for precise regulation-ideal for industrial control supplies and battery-operated instrumentation.
For engineers reviewing the LTC3642EMS8E#PBF datasheet, LTC3642EMS8E#PBF pinout, LTC3642EMS8E#PBF application, or LTC3642EMS8E#PBF equivalent, key selection criteria include input transient tolerance (60V), low-dropout 100% duty cycle capability, precise RUN pin threshold (1.21V rising), adjustable soft-start via SS pin, and compatibility with fixed 3.3V/5V or adjustable output configurations using external resistive feedback.
Technical Context
The LTC3642EMS8E#PBF implements a hysteretic Burst Mode® control architecture with dual internal power switches (P-channel high-side, N-channel low-side), eliminating external compensation. Its feedback comparator compares VFB against a trimmed 0.800V reference with ±5mV hysteresis, enabling automatic sleep/wake cycling to maintain regulation at ultra-low load currents.
Startup is managed by a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and configurable soft-start-either internal (0.75ms) or external via SS pin current source (5µA). Peak inductor current is set by a resistor from ISET to GND (25–115mA range), directly determining maximum average output current (up to 55mA).
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 - sufficient for powering microcontrollers, sensors, and analog front-ends in distributed systems. |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on portable instruments and remote sensors. |
| Feedback Reference Voltage | 0.800V ±8mV - enables accurate output regulation across temperature; allows flexible output programming via resistive divider. |
| Peak Current Limit Range | 25mA to 115mA - programmable via ISET resistor; sets maximum inductor current and determines max output capability and component sizing. |
| RUN Pin Threshold | 1.21V (rising), 1.10V (falling) - provides precise, hysteresis-controlled enable/disable for reliable power sequencing. |
| Package | MS8E (8-lead MSOP, 3mm × 3mm, exposed pad) - thermally enhanced for high ambient operation; requires soldered GND pad for thermal and electrical performance. |
Pinout & Package
The LTC3642EMS8E#PBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9, GND). The package measures 3mm × 3mm × 0.85mm and requires PCB ground plane connection to the exposed pad for optimal thermal dissipation (θJA = 40°C/W) and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching waveform; must be routed with minimal loop area to reduce EMI. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local 1µF ceramic bypass capacitor to GND for stable operation. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current (25–115mA); floating = max, shorted = min. |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor to GND sets ramp time; floating defaults to 0.75ms internal soft-start. |
| RUN (Pin 5) | Enable/disable control | Logic-level input: >1.21V enables operation; <0.7V forces shutdown (3µA IQ); hysteresis improves noise immunity. |
| VOUT/VFB (Pin 6) | Output feedback | For fixed-output versions, connect directly to VOUT; for adjustable, use resistive divider to scale output to 0.8V reference. |
| HYST (Pin 7) | Run hysteresis open-drain | Pulled low when RUN < 1.2V; can drive external resistor divider to increase effective RUN hysteresis. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Both pins are GND; exposed pad must be soldered to PCB ground plane for thermal management and low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads while drawing only 12µA IQ - critical for energy harvesting and long-life battery systems. |
| Integrated synchronous power switches | Eliminates need for external MOSFETs and gate drivers - reduces BOM count, layout area, and design risk in space-constrained modules. |
| Programmable peak current limit | Enables optimization of inductor size, input/output capacitance, and efficiency for specific load profiles - supports scalable designs across 10–50mA applications. |
| 100% duty cycle low-dropout mode | Allows VOUT to track VIN down to within ~200mV - essential for maintaining regulation during brownout or low-input conditions in automotive and industrial systems. |
| Precision RUN pin with adjustable hysteresis | Ensures clean, glitch-free startup/shutdown under noisy supply conditions - prevents oscillation during power-rail ramping or undervoltage events. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powers 4–20mA loop-powered transmitters in process automation, where input is derived from loop voltage (12–36V) and load must operate continuously with minimal quiescent draw. IC Role / Device Role / Timing Role: Primary step-down regulator supplying stable 3.3V or 5V to ADC, MCU, and analog signal chain - operates in Burst Mode® to sustain regulation at µA-level sensor bias currents. Use Value: 12µA no-load IQ extends loop compliance margin; 60V transient tolerance protects against field-wiring surges; programmable peak current allows compact inductor selection for PCB space savings. | Use Scenario: Powers wireless sensor nodes deployed in harsh factory environments, powered from 24V DC distribution rails with frequent voltage fluctuations and EMI exposure. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator delivering 5V/50mA to RF SoC and environmental sensors - leverages internal soft-start and RUN hysteresis for robust cold-start behavior after brownouts. Use Value: 4.5V–45V input range accommodates rail variations; exposed-pad MS8E package ensures thermal stability at 85°C ambient; low EMI Burst Mode® minimizes interference with sensitive analog measurements. |
| Portable Test Instrument Supply | Automotive Body Control Module Auxiliary Rail |
Use Scenario: Supplies regulated 3.3V to microcontroller, display driver, and precision DAC in handheld multimeters and oscilloscopes powered by Li-ion batteries (8–16.8V pack). IC Role / Device Role / Timing Role: Efficient buck converter operating across full battery discharge curve - maintains regulation down to 4.5V input while minimizing self-heating during extended bench use. Use Value: 100% duty cycle capability preserves output during low-battery operation; 0.8V reference enables tight output tolerance (<±1.5%) over temperature; MS8E package fits compact stacked PCB layouts. | Use Scenario: Generates auxiliary 5V rail for infotainment interface ICs and CAN transceivers in 12V automotive systems subject to load dump (up to 60V) and cold-crank (down to 3.5V). IC Role / Device Role / Timing Role: Input-robust secondary regulator protecting downstream logic from battery transients - uses UVLO/OVLO protection and precise RUN threshold for controlled activation after ignition. Use Value: Withstands 60V surges without external TVS; UVLO (3.75V) prevents erratic behavior during cranking; HYST pin enables custom hysteresis for stable wake-up from sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#PBF | Higher 2A output, wider 3.6–32V input, but 100µA IQ - lacks programmable peak current and 60V surge tolerance. | Targeted at solar-charged battery systems, not ultra-low-IQ industrial supplies. | Select only if >100mA output required; avoid for battery-life-critical applications due to higher quiescent current. |
| TPS62130ARGTR | 3–17V input, 3A output, 17µA IQ, fixed 3.3V/5V options - no 60V surge rating, no RUN hysteresis, smaller 3mm × 3mm QFN. | Optimized for consumer portables with stable mid-range inputs; unsuitable for 24V+ industrial rails. | Consider for cost-sensitive, high-current consumer designs; not recommended for 45V input or surge-prone environments. |
Compared with LT3652IMSE#PBF and TPS62130ARGTR, the LTC3642EMS8E#PBF uniquely balances ultra-low 12µA quiescent current, 60V transient survivability, and programmable current limiting in a thermally robust MSOP package - making it the only choice for long-duration, high-voltage industrial and instrumentation power rails.
Availability
LTC3642EMS8E#PBF is available at Aetrix Electronics and suitable for industrial control supplies, portable instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3642EMS8E#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3642 product line was designed specifically for high-input-voltage, ultra-low-quiescent-current DC/DC conversion in space- and energy-constrained industrial and instrumentation systems - emphasizing reliability under voltage transients and precision control over wide temperature ranges.
FAQ
What is the maximum input voltage the LTC3642EMS8E#PBF can withstand without damage?
The LTC3642EMS8E#PBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 47–52V. This allows the device to safely survive automotive load-dump transients and industrial power-rail surges while maintaining functionality once voltage returns to the 4.5V–45V operating range. The 60V rating applies to both continuous and transient conditions per Absolute Maximum Ratings.
Does the LTC3642EMS8E#PBF require external compensation components?
No, the LTC3642EMS8E#PBF does not require external compensation components. Its hysteretic Burst Mode® control architecture eliminates the need for loop compensation networks, simplifying design and reducing component count. Stability is inherent to the control scheme, which relies on feedback comparator hysteresis (5mV) and internal timing - verified across all operating conditions in the datasheet's Typical Performance Characteristics.
How is the output voltage configured for the LTC3642EMS8E#PBF?
The LTC3642EMS8E#PBF is offered in fixed-output versions (e.g., LTC3642EMS8E-3.3#PBF, LTC3642EMS8E-5#PBF) and an adjustable version. For fixed versions, VOUT/VFB (Pin 6) connects directly to the output. For the adjustable variant, a resistive divider scales the output to match the internal 0.800V reference: VOUT = 0.8V × (1 + R1/R2). Resistor values in the megohm range minimize no-load current impact.
What is the purpose of the HYST pin on the LTC3642EMS8E#PBF?
The HYST pin (Pin 7) is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V. It provides a means to externally adjust RUN pin hysteresis - for example, by connecting HYST to the RUN divider network - enabling customized startup/shutdown thresholds in noisy or dynamically varying supply environments. It does not source current and must be pulled up externally if used for level translation.
Can the LTC3642EMS8E#PBF operate with 100% duty cycle, and under what conditions?
Yes, the LTC3642EMS8E#PBF supports 100% duty cycle operation, allowing VOUT to closely track VIN down to approximately VIN – 200mV. This occurs during low-input or high-load conditions when the high-side switch remains continuously on - critical for maintaining regulation during automotive cold-crank (low battery) or industrial brownout scenarios. The feature is enabled automatically by the control logic without external configuration.
LTC3642EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3642EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EMS8E#PBF 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#PBF reliable?
The price and inventory of LTC3642EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3642EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EMS8E#PBF?
LTC3642EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EMS8E#PBF 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#PBF?
For technical support, including LTC3642EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EMS8E#PBF requirements.
6.How does Aetrix verify that LTC3642EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EMS8E#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642EMS8E#PBF?
All LTC3642EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EMS8E#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3642EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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