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Analog Devices Inc. LTC3642IMS8E-5#TRPBF
- Part No.:
- LTC3642IMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642IMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,483
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Product details
Overview
LTC3642IMS8E-5#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 at a fixed 5V 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 4–20mA loop-powered devices.
For engineers reviewing the LTC3642IMS8E-5#TRPBF datasheet, LTC3642IMS8E-5#TRPBF pinout, LTC3642IMS8E-5#TRPBF application, or LTC3642IMS8E-5#TRPBF equivalent, key selection criteria include its wide VIN range, programmable peak current limit (25–115mA), precise RUN pin threshold (1.21V rising), internal soft-start (0.75ms), and thermally enhanced MS8E package with exposed GND pad.
Technical Context
The LTC3642IMS8E-5#TRPBF uses a hysteretic Burst Mode® control architecture with an internal 0.800V feedback reference and 5mV comparator hysteresis, enabling high efficiency across load currents from 100µA to 50mA. Its peak current-limited switching regulates output by modulating burst frequency-not duty cycle-while maintaining regulation during light loads.
Startup is controlled via a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and optional HYST pin for external hysteresis adjustment. The ISET pin programs peak inductor current (25–115mA) using a resistor-to-GND, directly scaling maximum average output current (up to 55mA) and optimizing component size for low-power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports unregulated industrial rails, automotive batteries, and PoE-derived supplies without pre-regulation. |
| Output Voltage | Fixed 5V ±1.2% - guaranteed over –40°C to 125°C junction temperature; no external feedback divider required. |
| Max Output Current | 50mA continuous - limited by internal power switches and thermal design of MS8E package (θJA = 40°C/W). |
| Quiescent Current | 12µA typical in Burst Mode® - enables >1-year battery life in 10µA-sleep IoT nodes powered from coin cells. |
| Peak Current Limit | Programmable 25mA to 115mA via ISET resistor - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Run Pin Threshold | 1.21V (rising), 1.10V (falling) - provides clean, noise-immune enable/disable control with built-in hysteresis for stable power sequencing. |
| Soft-Start Time | 0.75ms internal default - prevents input supply droop during startup; extended externally via SS pin capacitor if needed. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E), 3mm × 3mm × 0.85mm profile, with exposed GND pad (Pin 9) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt switching waveform-requires tight layout and Kelvin grounding. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; must be bypassed with ≥1µF ceramic capacitor close to pin for stability and transient immunity. |
| 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; capacitor to GND extends ramp time beyond internal 0.75ms to reduce inrush and input droop. |
| RUN (Pin 5) | Enable/disable control | Logic-level input: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); hysteresis improves noise margin. |
| VOUT/VFB (Pin 6) | Output voltage sense / feedback | Internally connected to 5V output; serves as feedback node-no external divider needed for fixed-output version. |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V; used with external resistor to increase RUN pin hysteresis for noisy environments. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Exposes thermal pad (Pin 9) - must be soldered to large PCB copper area for θJC = 5–10°C/W and reliable 125°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 5V regulation at loads as low as 100µA while drawing only 12µA from VIN-critical for always-on sensor nodes. |
| Integrated power switches | Internal P-channel high-side and N-channel low-side MOSFETs eliminate external FETs and gate drivers-reducing BOM count to just 3 components. |
| 60V transient tolerance | Withstands 60V input surges without latch-up or damage-enables use in harsh industrial and automotive environments without external TVS. |
| No compensation required | Stable with standard ceramic output capacitors (≥10µF); eliminates loop compensation network and associated design iterations. |
| Low dropout operation | 100% duty cycle capability allows VOUT regulation down to VIN − 0.3V-supports brownout recovery and ultra-low VIN operation. |
Applications
| Industrial 4–20mA Loop Power | Portable Instrumentation Supply |
|---|---|
Use Scenario: Powers analog front-end circuitry (ADC, op-amps, transducers) in loop-powered field transmitters where supply is derived from 4–20mA current loop. IC Role / Device Role / Timing Role: Primary 5V regulator converting loop current into stable local rail; handles wide input variation (12–40V) and load transients. Use Value: Enables single-supply, isolated-loop designs with <12µA quiescent draw-preserving loop compliance voltage margin even at 4mA minimum. |
Use Scenario: Supplies microcontroller, display, and sensor subsystems in handheld test equipment operating from single Li-ion or AA cells. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping down variable battery voltage (e.g., 3.6–4.2V) to regulated 5V for USB peripherals or logic rails. Use Value: Delivers 50mA at >85% efficiency across full battery discharge curve while extending runtime via 12µA sleep current. |
| Distributed Power in Control Cabinets | Automotive Body Electronics |
Use Scenario: Provides localized 5V rail for PLC I/O modules, relay drivers, and communication interfaces mounted on DIN-rail backplanes with 24V nominal supply. IC Role / Device Role / Timing Role: Point-of-load regulator handling 24V ±20% variation, ESD transients, and load steps from solenoid activation. Use Value: 60V surge tolerance and robust RUN pin threshold eliminate need for upstream protection-reducing system cost and footprint. |
Use Scenario: Powers infotainment interface ICs, LED drivers, or CAN transceivers in automotive body control modules fed from 12V battery with cold-crank and load-dump events. IC Role / Device Role / Timing Role: Secondary regulator accepting 12V–45V input (including load dump), delivering clean 5V with fast transient response. Use Value: Internal soft-start and precise RUN threshold ensure glitch-free startup during battery recovery after cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-IQ buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62172DRVR | Lower VIN range (3–17V), higher IQ (19µA), 600mA output - lacks 60V surge tolerance and programmable peak current. | Best suited for 12V systems without transients; not viable for 45V industrial inputs or 4–20mA loops. | Select only if input is strictly ≤17V and higher output current is required; verify external protection for surges. |
| MAX17552ATP+T | Wider VIN (4.5–60V), 200mA output, 12µA IQ - requires external compensation and has no integrated soft-start or RUN hysteresis. | Applicable where higher current or absolute 60V continuous operation is needed-but adds design complexity and board area. | Choose when >50mA is required and layout space allows for compensation network and external soft-start circuitry. |
Compared with TPS62172DRVR and MAX17552ATP+T, the LTC3642IMS8E-5#TRPBF uniquely combines 45V max operating input, 60V surge tolerance, fixed 5V output, and zero-compensation operation in a thermally optimized MS8E package-making it optimal for space-constrained, low-power industrial and loop-powered applications where simplicity and ruggedness are critical.
Availability
LTC3642IMS8E-5#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA loop-powered devices, and portable instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3642IMS8E-5#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 its legacy of high-performance power management ICs with rigorous qualification and long-term product support.
The LTC3642IMS8E-5#TRPBF belongs to the LTC® high-voltage DC/DC converter family, designed specifically for rugged, low-quiescent-current regulation in industrial, automotive, and instrumentation applications where input transients, wide VIN range, and minimal external components are essential.
FAQ
What is the maximum input voltage the LTC3642IMS8E-5#TRPBF can withstand without damage?
The LTC3642IMS8E-5#TRPBF has an absolute maximum VIN rating of 60V and is explicitly rated to tolerate 60V input transients without latch-up or degradation. It operates continuously from 4.5V to 45V, with internal overvoltage lockout disabling switching above 50V (typical) to protect downstream circuitry. This makes the LTC3642IMS8E-5#TRPBF suitable for automotive load-dump and industrial surge environments without external clamping.
Does the LTC3642IMS8E-5#TRPBF require external compensation components?
No, the LTC3642IMS8E-5#TRPBF does not require external compensation components. Its hysteretic Burst Mode® control architecture is inherently stable with standard ceramic output capacitors (≥10µF). The fixed 5V output version (LTC3642IMS8E-5#TRPBF) eliminates feedback divider networks, reducing the total external component count to just three: input capacitor, output capacitor, and inductor.
How is the peak current limit set on the LTC3642IMS8E-5#TRPBF?
The peak current limit on the LTC3642IMS8E-5#TRPBF is set via the ISET pin (Pin 3), which sources a precise 1µA current. Connecting a resistor from ISET to GND generates a voltage that offsets the internal peak current comparator. A floating ISET pin yields 115mA peak current; shorting it to GND sets 25mA; intermediate values (e.g., 500kΩ) yield ~55mA. This directly scales maximum average output current and optimizes inductor sizing.
What is the purpose of the HYST pin on the LTC3642IMS8E-5#TRPBF?
The HYST pin (Pin 7) on the LTC3642IMS8E-5#TRPBF is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V. It enables external hysteresis enhancement-for example, by connecting HYST to RUN through a resistor-thereby increasing the effective RUN pin hysteresis beyond the internal 110mV. This improves noise immunity in electrically noisy industrial environments.
Can the LTC3642IMS8E-5#TRPBF operate in 100% duty cycle mode?
Yes, the LTC3642IMS8E-5#TRPBF supports 100% duty cycle operation, allowing VOUT regulation even when VIN drops near VOUT (e.g., VIN = 5.3V → VOUT = 5V). This low-dropout capability ensures uninterrupted power delivery during brownout conditions and simplifies system-level power sequencing in battery-backed or energy-harvesting applications using the LTC3642IMS8E-5#TRPBF.
LTC3642IMS8E-5#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3642IMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IMS8E-5#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 LTC3642IMS8E-5#TRPBF reliable?
The price and inventory of LTC3642IMS8E-5#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642IMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IMS8E-5#TRPBF?
LTC3642IMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IMS8E-5#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 LTC3642IMS8E-5#TRPBF?
For technical support, including LTC3642IMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LTC3642IMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IMS8E-5#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 LTC3642IMS8E-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642IMS8E-5#TRPBF?
All LTC3642IMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IMS8E-5#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 LTC3642IMS8E-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642IMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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