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Analog Devices Inc. LTC3642IMS8E#PBF
- Part No.:
- LTC3642IMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642IMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:417
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Product details
Overview
LTC3642IMS8E#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 features 12µA no-load quiescent current, programmable peak current limit (25–115mA), and 0.8V feedback reference, enabling efficient regulation in battery- and industrial-supply applications.
For engineers reviewing the LTC3642IMS8E#PBF datasheet, LTC3642IMS8E#PBF pinout, LTC3642IMS8E#PBF application, or LTC3642IMS8E#PBF equivalent, key selection criteria include its 60V transient tolerance, MS8E thermally enhanced 8-lead MSOP package, Burst Mode® operation for ultra-low IQ, precise RUN pin threshold (1.21V rising), and internal soft-start with external adjustability via SS pin.
Technical Context
The LTC3642IMS8E#PBF 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 sleep mode. Its peak current limit is set by a resistor from ISET to GND (25–115mA), directly determining maximum average output current (up to 50mA).
Startup is managed by a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and dual soft-start: internal 0.75ms ramp plus external capacitor-based ramp on SS pin. The device integrates both power switches, eliminating external compensation and requiring only three components for fixed-output configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial, automotive, and battery inputs; tolerates 60V transients without damage. |
| Output Current | Up to 50mA - sufficient for low-power sensors, microcontrollers, and interface ICs in distributed systems. |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on monitoring devices. |
| Feedback Reference Voltage | 0.800V ±8mV - stable reference for accurate output regulation across temperature and load. |
| Peak Current Limit Range | 25mA to 115mA - programmable via ISET resistor to optimize efficiency and component size for specific load profiles. |
| Run Pin Threshold | 1.21V (rising), 1.10V (falling) - precise enable/disable control with built-in hysteresis for clean power sequencing. |
| Package | MS8E (8-lead MSOP, 3mm × 3mm, 0.75mm height) - thermally enhanced with exposed GND pad for improved thermal resistance (θJC = 5–10°C/W). |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; ties to drains of internal high-side and low-side MOSFETs. |
| 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 input | Sources 1µA; resistor to GND sets peak inductor current (25–115mA), defining max output capability and component sizing. |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor to GND controls output voltage ramp time, preventing input droop during startup. |
| RUN (Pin 5) | Enable/disable control | Logic-level input: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); hysteresis prevents chatter near threshold. |
| 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) | Open-drain hysteresis indicator | Pulled low when RUN is inactive; used externally to increase RUN pin hysteresis in VIN-monitoring circuits. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Common return for all circuitry; exposed pad must be soldered to PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ while delivering full 50mA output-enables high efficiency across 100:1 load range without external control logic. |
| Integrated synchronous power switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity for compact, reliable designs. |
| Programmable peak current limit | Adjusts max inductor current from 25mA to 115mA via single resistor-optimizes inductor/capacitor sizing and ripple for target load and board space. |
| Precision RUN pin with hysteresis | 1.21V enable threshold with 110mV hysteresis ensures robust power sequencing in noisy environments and prevents false turn-on/off during supply ramps. |
| Internal soft-start + external adjustability | Default 0.75ms internal ramp prevents inrush; SS pin allows user-defined longer ramp (e.g., 10ms+) to minimize input supply sag in sensitive systems. |
Applications
| 4–20mA Current Loop Power Supply | Industrial Sensor Node Regulator |
|---|---|
Use Scenario: Powers 4–20mA transmitter circuitry from a 24V loop supply while maintaining compliance voltage margin. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 3.3V or 5V rail to sensor front-end, ADC, and loop driver ICs. Use Value: 60V transient tolerance protects against field-induced surges; low 12µA IQ extends loop-powered device uptime without compromising signal integrity. | Use Scenario: Supplies isolated or non-isolated wireless sensor nodes deployed in factory automation or process control cabinets. IC Role / Device Role / Timing Role: Main power converter delivering regulated 3.3V to ultra-low-power MCU, RF transceiver, and analog sensor interface. Use Value: Wide 4.5V–45V input accommodates fluctuating 24VDC rails; programmable peak current allows use of miniature 47µH inductors to reduce footprint. |
| Portable Instrument Power Management | Automotive Body Control Module (BCM) Auxiliary Rail |
Use Scenario: Powers handheld test equipment (e.g., multimeters, data loggers) from primary Li-ion or alkaline battery packs. IC Role / Device Role / Timing Role: Efficient buck converter generating 5V or adjustable output for display, USB interface, and measurement circuitry. Use Value: 12µA quiescent current enables multi-month shelf life; low dropout (100% duty cycle) extends runtime down to 4.5V battery cutoff. | Use Scenario: Generates auxiliary 3.3V or 5V rail in automotive BCMs from 12V battery, surviving load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Robust secondary regulator supporting CAN transceivers, EEPROM, and wake-up logic in harsh automotive environments. Use Value: 60V surge tolerance meets ISO 7637-2 Pulse 1/5a requirements; MS8E package provides thermal resilience under hood temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-IQ step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMS8E#PBF | Same silicon, commercial-grade (0°C to 85°C junction) vs industrial-grade (–40°C to 125°C) for LTC3642IMS8E#PBF. | Not suitable for extended temperature environments such as outdoor industrial enclosures or automotive under-hood locations. | Select LTC3642IMS8E#PBF when operating ambient exceeds 85°C or requires guaranteed spec compliance over –40°C to 125°C. |
| LTC3642IDD#PBF | Same functionality in 3mm × 3mm DFN package (exposed pad), θJA = 43°C/W vs MS8E's 40°C/W; identical electrical specs. | Preferred where board area is constrained and thermal path to inner layers is optimized via DFN pad; less compatible with legacy MSOP footprints. | Choose LTC3642IDD#PBF for space-constrained layouts with multi-layer thermal vias; retain LTC3642IMS8E#PBF for compatibility with existing MSOP tooling and reflow profiles. |
Compared with LTC3642EMS8E#PBF, the LTC3642IMS8E#PBF guarantees full electrical specifications across –40°C to 125°C, making it essential for industrial and automotive deployments; versus LTC3642IDD#PBF, it offers slightly better thermal resistance in MSOP form factor, easing heatsinking in convection-cooled assemblies.
Availability
LTC3642IMS8E#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA loop supplies, portable instrumentation, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3642IMS8E#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio, emphasizing reliability, precision, and ruggedness for demanding applications.
The LTC3642IMS8E#PBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for industrial, automotive, and instrumentation systems needing wide-input, low-quiescent-current regulation with integrated power switches and robust protection.
FAQ
What is the guaranteed operating temperature range for the LTC3642IMS8E#PBF?
The LTC3642IMS8E#PBF is specified and guaranteed over the full industrial junction temperature range of –40°C to 125°C. This is confirmed in the Absolute Maximum Ratings and Order Information tables, where "I" grade denotes industrial temperature qualification. Unlike the "E" grade (0°C to 85°C), the "I" grade undergoes full characterization and testing across this extended range, ensuring parameter compliance in harsh environments such as factory floors or automotive under-hood applications.
Can the LTC3642IMS8E#PBF regulate output voltage below 3.3V?
Yes, the LTC3642IMS8E#PBF supports adjustable output versions (not fixed 3.3V or 5V variants) using an external resistive divider on the VOUT/VFB pin. With its 0.800V ±8mV internal reference, the output can be set from 0.8V up to VIN using the formula VOUT = 0.8V × (1 + R1/R2). For example, selecting R1 = 0Ω and R2 = ∞ yields 0.8V; practical minimums around 1.2V are achievable with standard 1% resistors while maintaining noise immunity and load regulation accuracy.
How does the ISET pin affect maximum output current in the LTC3642IMS8E#PBF?
The ISET pin on the LTC3642IMS8E#PBF programs the peak inductor current limit from 25mA (ISET shorted to GND) to 115mA (ISET floating), with intermediate values set by a resistor to GND. Since the architecture delivers maximum average output current equal to half the peak current, setting ISET for 115mA peak yields ~50mA max output, while 25mA peak limits average output to ~12.5mA. This direct scaling allows precise matching of converter capability to actual load requirements, minimizing unnecessary component stress and ripple.
Does the LTC3642IMS8E#PBF require external compensation components?
No, the LTC3642IMS8E#PBF does not require external compensation components. Its hysteretic Burst Mode® control architecture uses internal feedback comparison against the 0.8V reference and inherent propagation delays to achieve stable regulation without loop compensation networks. This eliminates the need for external capacitors or resistors in the feedback path-only the output voltage-setting resistors (for adjustable versions) and basic input/output capacitors are required, simplifying design and reducing bill-of-materials count.
What is the purpose of the HYST pin on the LTC3642IMS8E#PBF, and how is it used?
The HYST pin on the LTC3642IMS8E#PBF is an open-drain logic output that is pulled low whenever the RUN pin voltage falls below its 1.10V falling threshold, indicating disabled operation. It is used to extend the effective hysteresis of the RUN comparator in applications where RUN monitors VIN via a resistive divider-connecting HYST to the divider's midpoint adds positive feedback, widening the enable/disable voltage window and preventing oscillation during slow-ramping or noisy supply conditions. It is not an input and must never be driven externally.
LTC3642IMS8E#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
LTC3642IMS8E#PBF FAQ
1.How can I place an order for LTC3642IMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IMS8E#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 LTC3642IMS8E#PBF reliable?
The price and inventory of LTC3642IMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3642IMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642IMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IMS8E#PBF?
LTC3642IMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IMS8E#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 LTC3642IMS8E#PBF?
For technical support, including LTC3642IMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IMS8E#PBF requirements.
6.How does Aetrix verify that LTC3642IMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IMS8E#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 LTC3642IMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642IMS8E#PBF?
All LTC3642IMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IMS8E#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 LTC3642IMS8E#PBF part is unused and in its original packaging.
Return procedure for LTC3642IMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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