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Analog Devices Inc. LTC3642IMS8E-5#PBF
- Part No.:
- LTC3642IMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642IMS8E-5#PBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:274
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Product details
Overview
LTC3642IMS8E-5#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 at a fixed 5V output. It operates from 4.5V to 45V input, maintains regulation with only 12µA quiescent current in Burst Mode®, and tolerates 60V input transients-ideal for industrial control supplies and battery-operated devices with wide-input legacy rails.
For engineers reviewing the LTC3642IMS8E-5#PBF datasheet, LTC3642IMS8E-5#PBF pinout, LTC3642IMS8E-5#PBF application, or LTC3642IMS8E-5#PBF equivalent, key selection criteria include its programmable peak current limit (25–115mA), internal soft-start, precise RUN pin threshold (1.21V rising), and thermally enhanced MS8E package with exposed GND pad for industrial-grade thermal performance.
Technical Context
The LTC3642IMS8E-5#PBF uses a hysteretic Burst Mode® control architecture with an internal 0.800V feedback reference and 5mV comparator hysteresis, enabling ultra-low quiescent current operation while maintaining tight output regulation across load currents from 100µA to 50mA. Its peak-current-limited switching loop integrates both power switches and eliminates external compensation.
Startup is controlled by a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and supports external hysteresis via the open-drain HYST pin. The ISET pin allows resistor-programmable peak inductor current (25mA to 115mA), directly scaling component size and efficiency for low-power applications without altering loop stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-input industrial, automotive, and battery-derived rails; withstands 60V transients without damage. |
| Output Voltage | Fixed 5.0V ±1.2% - tightly regulated over temperature and line/load; no external feedback divider required. |
| Max Output Current | 50mA - average output limited by architecture to half the programmed peak inductor current (100mA max peak). |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on sensor nodes and portable instruments. |
| Feedback Reference | 0.800V ±1% - stable internal reference used for output sensing; enables accurate voltage programming in adjustable variants. |
| Peak Current Limit | Programmable 25mA to 115mA via ISET resistor - reduces inductor/capacitor size and ripple in low-current designs. |
| Soft-Start Time | 0.75ms internal default; externally adjustable via SS pin capacitor - prevents input droop during cold start in distributed systems. |
| Package | MS8E (8-lead MSOP, 3mm × 3mm, 0.75mm height) with exposed GND pad - optimized thermal resistance (θJC = 5–10°C/W) for high ambient operation. |
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 to inductor; ties drains of internal high-side P-MOSFET and low-side N-MOSFET - must be routed with minimal parasitic inductance. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local 1µF ceramic bypass to GND (Pin 8) for high-frequency noise suppression. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current from 25mA (shorted) to 115mA (open) - enables optimization of efficiency vs. size. |
| SS (Pin 4) | Soft-start control | Sources 5µA; capacitor to GND sets ramp time - overrides internal 0.75ms soft-start for controlled voltage rise in sensitive systems. |
| RUN (Pin 5) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (3µA IQ); hysteresis configurable via HYST pin. |
| VOUT/VFB (Pin 6) | Output feedback | Direct connection to 5V output for fixed-version regulation; senses voltage against 0.800V internal reference. |
| HYST (Pin 7) | Run hysteresis logic output | Open-drain output pulled low when RUN < 1.2V - used to add external hysteresis to RUN divider network. |
| GND (Pin 8) | Signal ground | Primary ground return; must be connected to PCB ground plane alongside exposed pad (Pin 9). |
| GND (Pin 9) | Thermal ground pad | Exposed copper pad - mandatory soldering to large PCB ground plane for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Enables 12µA no-load IQ while maintaining ±1.2% output regulation - critical for energy-harvesting and long-life battery systems. |
| Integrated dual MOSFETs | Eliminates external high-side/low-side switch selection and gate drive design - reduces BOM count to just inductor + two capacitors for fixed-output use. |
| 60V transient tolerance | Internal overvoltage protection sustains 60V surges without latch-off or damage - suitable for 24V/48V industrial bus environments with load-dump risk. |
| No compensation required | Internally compensated hysteretic control loop - removes need for external RC networks, simplifying layout and improving reliability across temperature. |
| Precision RUN threshold | 1.21V enable voltage with 110mV hysteresis ensures clean, bounce-free startup even with noisy supply rails or slow-rising inputs. |
| Low dropout operation | 100% duty cycle capability allows VOUT regulation down to VIN – 0.3V - supports near-battery-dropout operation in single-cell LiFePO₄ or 3.3V backup scenarios. |
Applications
| Industrial Control Supplies | Portable Instruments |
|---|---|
Use Scenario: Powering 4–20mA current-loop transmitters and PLC I/O modules from unregulated 24V factory rails with surge exposure. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator providing isolated, low-noise supply for analog front-ends and DACs. Use Value: 60V transient tolerance and 12µA quiescent current ensure uninterrupted operation during brownouts and extended field deployment without thermal derating. |
Use Scenario: Supplying microcontroller, display, and sensor subsystems in handheld multimeters and gas detectors powered by two AA cells. IC Role / Device Role / Timing Role: High-efficiency step-down converter extending battery life while maintaining stable 5V rail across 3.0V–4.5V battery discharge curve. Use Value: Wide 4.5V–45V input range accommodates boost-derived 5V rails or direct battery input with low dropout mode preserving runtime at end-of-discharge. |
| Distributed Power Systems | Automotive Power Systems |
Use Scenario: Local 5V regulation on remote sensor nodes in building automation or smart grid infrastructure with long cable feeds. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage converting 12V/24V backbone voltage to clean 5V for MCU and comms ICs. Use Value: MS8E package with exposed GND pad delivers 40°C/W θJA - enables operation at 85°C ambient without heatsink in confined enclosures. |
Use Scenario: Powering infotainment peripherals and telematics modules from vehicle 12V battery with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Input-protected 5V regulator surviving ISO 7637-2 Pulse 1 (–100V), Pulse 2a (+100V), and Pulse 5a (76V surge). Use Value: Internal 60V OVP and –0.3V to 60V absolute max ratings eliminate need for external TVS clamping in cost-sensitive automotive modules. |
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-5#PBF | Higher 100mA output current; identical 4.5V–45V input and 5V fixed output; same MS8E package and pinout. | Supports higher load currents without redesign; requires larger inductor and output capacitor for full 100mA capability. | Select when >50mA load margin is required; retains same footprint, layout, and control interface. |
| TPS62130ARGTR | 3V–17V input; 3A output; 3.3V/5V adjustable; 2.1MHz fixed-frequency PWM - no Burst Mode®, higher IQ (18µA). | Optimized for high-current, space-constrained apps; lacks 60V surge tolerance and wide-input capability. | Choose for compact, high-efficiency buck in 3.3V/5V systems with stable low-voltage rails - not suitable for industrial transients or battery-derived 24V+ inputs. |
Compared with LT3643EMS8E-5#PBF, the LTC3642IMS8E-5#PBF trades output current headroom for lower quiescent current and superior transient robustness; versus TPS62130ARGTR, it prioritizes wide-input resilience and micropower operation over raw current delivery and switching frequency.
Availability
LTC3642IMS8E-5#PBF is available at Aetrix Electronics and suitable for industrial control supplies, portable instruments, and distributed power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3642IMS8E-5#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-reliability analog and power management portfolio with rigorous qualification and long-term product support.
The LTC3642IMS8E-5#PBF belongs to Linear's high-voltage micropower DC/DC converter family, designed specifically for industrial, automotive, and battery-powered applications demanding wide input range, ultra-low IQ, and robust transient immunity.
FAQ
What is the guaranteed operating temperature range for the LTC3642IMS8E-5#PBF?
The LTC3642IMS8E-5#PBF is specified and guaranteed over –40°C to +125°C junction temperature. This "I-grade" rating ensures reliable operation in harsh industrial and automotive under-hood environments where ambient temperatures exceed 85°C. Thermal design must maintain TJ ≤ 125°C using the MS8E package's exposed GND pad and appropriate PCB copper area.
Does the LTC3642IMS8E-5#PBF require external compensation components?
No, the LTC3642IMS8E-5#PBF uses an internally compensated hysteretic control architecture. Unlike voltage-mode or current-mode controllers, it needs no external compensation network - only three external components (inductor, input capacitor, output capacitor) are required for basic operation in the fixed 5V configuration.
Can the LTC3642IMS8E-5#PBF safely handle input voltage surges beyond its 45V maximum operating rating?
Yes. The LTC3642IMS8E-5#PBF includes internal overvoltage lockout that disables switching above 47V–52V (typical), and its absolute maximum VIN rating is 60V. It can sustain 60V transients indefinitely without damage - a key feature for industrial 24V systems subject to load-dump events per ISO 16750-2.
How does the ISET pin affect efficiency and component selection in the LTC3642IMS8E-5#PBF?
The ISET pin on the LTC3642IMS8E-5#PBF programs peak inductor current from 25mA to 115mA via a resistor to GND. Lower peak current reduces required inductor value and output capacitance, lowering board area and cost while maintaining high efficiency at light loads - ideal for sub-20mA sensor nodes.
Is the LTC3642IMS8E-5#PBF pin-compatible with other variants in the LTC3642 family?
Yes. All LTC3642 variants - including LTC3642IMS8E-3.3#PBF, LTC3642IMS8E-5#PBF, and LTC3642IMS8E#PBF (adjustable) - share identical MS8E pinout, package dimensions, and thermal pad layout. Only the feedback network differs; the 5V fixed version connects VOUT/VFB directly to output, eliminating external resistors.
LTC3642IMS8E-5#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:
- 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
LTC3642IMS8E-5#PBF FAQ
1.How can I place an order for LTC3642IMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IMS8E-5#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-5#PBF reliable?
The price and inventory of LTC3642IMS8E-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642IMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IMS8E-5#PBF?
LTC3642IMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IMS8E-5#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-5#PBF?
For technical support, including LTC3642IMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IMS8E-5#PBF requirements.
6.How does Aetrix verify that LTC3642IMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IMS8E-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642IMS8E-5#PBF?
All LTC3642IMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IMS8E-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LTC3642IMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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