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Analog Devices Inc. LTC3642EMS8E-3.3#PBF
- Part No.:
- LTC3642EMS8E-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642EMS8E-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
LTC3642EMS8E-3.3#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 3.3V 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 portable instrumentation.
For engineers reviewing the LTC3642EMS8E-3.3#PBF datasheet, LTC3642EMS8E-3.3#PBF pinout, LTC3642EMS8E-3.3#PBF application, or LTC3642EMS8E-3.3#PBF equivalent, key selection criteria include its 3.3V fixed output accuracy (±1.2% over temperature), programmable peak current limit (25–115mA), internal soft-start, precise RUN pin threshold (1.21V rising), and thermally enhanced MS8E package for reliable operation in harsh environments.
Technical Context
The LTC3642EMS8E-3.3#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.800V feedback reference and 5mV comparator hysteresis, enabling automatic transition between active switching and ultra-low-power sleep cycles. Its peak-current-limited synchronous rectification eliminates external diodes and supports 100% duty-cycle low-dropout operation.
Startup is managed via a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and dual soft-start capability-internal 0.75ms ramp plus external capacitor-based timing on the SS pin. Input protection includes undervoltage lockout (UVLO = 4.35V max falling) and overvoltage lockout (OVLO = 48V min falling), allowing safe operation during 60V surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive supplies, including 24V and 36V rails. |
| Output Voltage | 3.3V ±1.2% - tightly regulated fixed output, verified across –40°C to 125°C junction temperature. |
| Max Output Current | 50mA - average load current supported by peak current limit of 115mA (ISET floating). |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery operation in always-on sensor nodes. |
| Feedback Reference | 0.800V ±1% - precise internal voltage reference used for output regulation and stability. |
| Peak Current Limit | Programmable 25mA to 115mA via ISET pin resistor - allows optimization of inductor size and efficiency for specific load profiles. |
| Run Pin Threshold | 1.21V rising / 1.10V falling - provides clean, hysteresis-controlled enable/disable with minimal external components. |
| Package Thermal Resistance | θJA = 40°C/W (MS8E) - enables >1W power dissipation in compact 3mm × 3mm footprint with proper PCB copper. |
Pinout & Package
The LTC3642EMS8E-3.3#PBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed thermal pad (Pin 9, GND). The package measures 3mm × 3mm × 0.85mm and requires soldering of the exposed pad to PCB ground 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 P-MOSFET and low-side N-MOSFET. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local 1µF ceramic bypass 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 | Direct connection to 3.3V output; monitors regulation against internal 0.800V reference. |
| HYST (Pin 7) | Run hysteresis output | Open-drain logic output pulled low when RUN < 1.2V; usable to enhance RUN pin hysteresis externally. |
| 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 |
|---|---|
| No compensation required | Internal loop compensation eliminates external RC networks-reducing BOM count and layout sensitivity. |
| Burst Mode® operation | Enables 12µA no-load IQ while maintaining tight output regulation-critical for energy-constrained systems. |
| 60V transient tolerance | Internal overvoltage monitor sustains 60V input surges without latch-up or damage-ideal for automotive and industrial environments. |
| Low dropout (100% duty cycle) | Supports VIN as low as VOUT + dropout loss-enables regulation down to ~3.5V input for 3.3V output. |
| Thermally enhanced MS8E | 3mm × 3mm footprint with θJA = 40°C/W-delivers higher power density than standard MSOP packages. |
| Precision RUN threshold | 1.21V enable with 110mV hysteresis ensures robust start-up sequencing and brown-out immunity. |
Applications
| Industrial Sensor Nodes | Portable Test Equipment |
|---|---|
Use Scenario: Battery-powered pressure, temperature, or gas sensors deployed in remote industrial sites requiring multi-year operation. IC Role / Device Role / Timing Role: Primary 3.3V power regulator converting wide-input industrial bus (12–36V) or Li-ion battery (3.0–4.2V) to stable rail for MCU, ADC, and wireless transceiver. Use Value: 12µA quiescent current extends battery life; 60V surge tolerance prevents field failures during line transients. | Use Scenario: Handheld multimeters, oscilloscope probes, and calibration tools needing compact, efficient 3.3V supply from AA/AAA or LiPo batteries. IC Role / Device Role / Timing Role: Synchronous buck converter powering low-power microcontroller, display driver, and precision analog front-end. Use Value: Fixed 3.3V output eliminates external resistive divider; MS8E package enables ultra-thin device profiles. |
| Automotive Body Electronics | Distributed Power Systems |
Use Scenario: Door modules, seat controllers, and lighting ECUs operating from 12V battery with cold-crank (up to 60V) and load-dump events. IC Role / Device Role / Timing Role: Point-of-load regulator supplying 3.3V to CAN transceivers, LIN interfaces, and small MCUs in non-safety-critical domains. Use Value: UVLO/OVLO protection ensures reliable start-up and shutdown across automotive voltage extremes; -40°C to 125°C rating matches under-hood requirements. | Use Scenario: Modular PLC I/O cards, distributed I/O terminals, and fieldbus gateways requiring isolated 3.3V rails from 24V backplane. IC Role / Device Role / Timing Role: Local DC/DC converter providing clean, regulated 3.3V for FPGA configuration, Ethernet PHY, and real-time communication processors. Use Value: Programmable peak current (via ISET) allows optimization for varying load currents across module variants-reducing design proliferation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62590DRVR | 3.3V fixed output, 300mA max, 2.5V–6V input, 17µA IQ, WSON-6 package | Lower input voltage range limits use to battery-only systems; higher current capability unnecessary for 50mA loads. | Select only if system input stays within 2.5V–6V and higher output current headroom is needed. |
| MAX17552ATC+ | Adjustable output (0.9V–5V), 200mA max, 4.5V–42V input, 100µA IQ, 12-TQFN | Higher quiescent current reduces battery life; adjustable output requires external resistors and increases BOM cost. | Choose only if output voltage flexibility or higher current is required-and board space permits larger package. |
Compared with TPS62590DRVR and MAX17552ATC+, the LTC3642EMS8E-3.3#PBF delivers superior efficiency at light loads (<1mA) due to its 12µA IQ and Burst Mode®, maintains full 4.5V–45V input compatibility with automotive and industrial sources, and achieves tighter output accuracy (±1.2%) without external feedback components.
Availability
LTC3642EMS8E-3.3#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, portable test equipment, automotive body electronics, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC3642EMS8E-3.3#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3642EMS8E-3.3#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-input-voltage, ultra-low-quiescent-current DC/DC conversion in space- and energy-constrained embedded systems.
FAQ
What is the output voltage tolerance of the LTC3642EMS8E-3.3#PBF over temperature?
The LTC3642EMS8E-3.3#PBF delivers a fixed 3.3V output with ±1.2% total error over the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table (VOUT rising/falling thresholds at 3.260V–3.360V). This includes initial accuracy, line regulation, load regulation, and temperature drift-all guaranteed by design and correlation testing.
Can the LTC3642EMS8E-3.3#PBF operate with input voltages below 4.5V?
No-the LTC3642EMS8E-3.3#PBF has a hard undervoltage lockout (UVLO) threshold of 4.35V maximum (falling), and will disable switching if VIN drops below ~4.0V. It cannot regulate at inputs below 4.5V, though it supports 100% duty cycle operation near that boundary to maximize dropout performance.
How does the ISET pin affect peak current and efficiency in the LTC3642EMS8E-3.3#PBF?
The ISET pin on the LTC3642EMS8E-3.3#PBF sources a precise 1µA current; connecting a resistor to GND sets the peak inductor current from 25mA (0Ω) to 115mA (open). Lower peak current reduces RMS losses in the inductor and switches, improving light-load efficiency-but requires larger inductance to maintain regulation, trading off size versus efficiency.
Is an external compensation network required for the LTC3642EMS8E-3.3#PBF?
No-the LTC3642EMS8E-3.3#PBF uses an internally compensated hysteretic control architecture. No external compensation components (e.g., type-II or type-III networks) are needed, simplifying design, reducing component count, and eliminating loop-stability tuning effort across input/output conditions.
What is the role of the HYST pin on the LTC3642EMS8E-3.3#PBF?
The HYST pin on the LTC3642EMS8E-3.3#PBF is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V. It provides a direct indication of regulator enable status and can be used with an external pull-up resistor to increase effective RUN pin hysteresis-improving noise immunity in high-EMI environments.
LTC3642EMS8E-3.3#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):
- 3.3V
- 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-3.3#PBF FAQ
1.How can I place an order for LTC3642EMS8E-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EMS8E-3.3#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-3.3#PBF reliable?
The price and inventory of LTC3642EMS8E-3.3#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-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642EMS8E-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EMS8E-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EMS8E-3.3#PBF?
LTC3642EMS8E-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EMS8E-3.3#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-3.3#PBF?
For technical support, including LTC3642EMS8E-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EMS8E-3.3#PBF requirements.
6.How does Aetrix verify that LTC3642EMS8E-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EMS8E-3.3#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-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642EMS8E-3.3#PBF?
All LTC3642EMS8E-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EMS8E-3.3#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-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC3642EMS8E-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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