My Inquiry
My Account
Analog Devices Inc. LTC3642IMS8E#TRPBF
- Part No.:
- LTC3642IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642IMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,070
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3642IMS8E#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 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 maintains regulation during 60V input transients. It is used in industrial control supplies and battery-operated instrumentation requiring ultra-low standby power.
For engineers reviewing the LTC3642IMS8E#TRPBF datasheet, LTC3642IMS8E#TRPBF pinout, LTC3642IMS8E#TRPBF application, or LTC3642IMS8E#TRPBF equivalent, key selection criteria include its 45V max input rating, MS8E thermally enhanced 8-lead MSOP package, 0.8V feedback reference, internal soft-start, and precise RUN pin threshold with adjustable hysteresis - all critical for robust, low-power industrial power rail design.
Technical Context
The LTC3642IMS8E#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback reference and 5mV comparator hysteresis, enabling high efficiency across 0.1mA–50mA load range. Its peak current-limited switching uses a programmable ISET pin (1µA sourced) to set trip thresholds from 25mA to 115mA, directly determining maximum average output current (≤50mA).
Startup is managed via a precision RUN pin comparator (1.21V rising threshold, 110mV hysteresis) and optional HYST pin for external hysteresis adjustment. The device integrates undervoltage lockout (UVLO: 3.75V–4.50V) and overvoltage lockout (OVLO: 47V–52V), tolerating 60V transients while maintaining safe shutdown behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide industrial and automotive supply rails; withstands 60V transients without damage. |
| Output Current | Up to 50mA - sufficient for powering microcontrollers, sensors, and analog front-ends in space-constrained 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 - precise reference enables accurate output regulation; supports adjustable outputs via external resistor divider. |
| Peak Current Limit Range | 25mA to 115mA - programmable via ISET pin resistor; sets maximum inductor current and determines optimal component sizing. |
| Soft-Start Time | 0.75ms internal or externally adjustable - prevents input supply droop during startup; SS pin sources 5µA for controlled ramp. |
| RUN Pin Threshold | 1.21V rising / 1.10V falling - precise enable/disable control with 110mV hysteresis; HYST pin allows external hysteresis extension. |
| Package | MS8E (8-lead MSOP, 3mm × 3mm, 0.75mm height) - thermally enhanced with exposed GND pad for low θJA (40°C/W). |
Pinout & Package
Package: MS8E - 8-lead plastic MSOP with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for 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 to drains of internal high-side P-MOSFET and low-side N-MOSFET. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; requires local ceramic bypass capacitor to GND for stability and transient response. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak current limit (25–115mA); floating = 115mA, shorted = 25mA. |
| 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 | Active-high logic: >1.21V enables operation; <0.7V forces shutdown (3µA IQ); hysteresis improves noise immunity. |
| VOUT/VFB (Pin 6) | Output feedback | Connects to regulated output (fixed versions) or resistive divider (adjustable versions); compares to 0.8V internal reference. |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V; used to extend RUN pin hysteresis via external resistor to VIN or RUN. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Both pins must be connected to PCB ground plane; exposed pad is essential for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ while delivering full 50mA output - eliminates need for external enable sequencing in low-power systems. |
| Integrated power switches | Internal high-side P-MOSFET and low-side N-MOSFET eliminate external FETs and gate drivers - reduces BOM count and layout complexity. |
| 60V transient tolerance | Withstands 60V surges without latch-up or damage - suitable for harsh environments like automotive jump-start or industrial line transients. |
| No compensation required | Internally compensated control loop - eliminates external compensation network, saving board area and validation effort. |
| Low dropout operation | 100% duty cycle capability - supports output voltages near VIN, e.g., 5V out from 5.5V input, extending usable input range. |
| Precise RUN threshold with hysteresis | 1.21V rising / 1.10V falling threshold + HYST pin - enables clean, glitch-free power sequencing without external supervisors. |
Applications
| 4–20mA Current Loops | Industrial Control Supplies |
|---|---|
Use Scenario: Powering loop-powered transmitters in process automation where supply is derived from 4–20mA loop voltage. IC Role / Device Role / Timing Role: Step-down regulator generating stable 3.3V or 5V rail from variable loop voltage (typically 12–36V). Use Value: Ultra-low 12µA quiescent current ensures minimum loop burden; 45V input range accommodates worst-case loop compliance voltage. |
Use Scenario: Local regulation for PLC I/O modules, sensor interfaces, and fieldbus controllers operating from unregulated 24V DC rails. IC Role / Device Role / Timing Role: Primary point-of-load converter delivering 50mA at 3.3V/5V with high reliability under voltage transients. Use Value: 60V surge tolerance and internal UVLO/OVLO protect against industrial line disturbances; MS8E package enables compact, thermally robust layout. |
| Distributed Power Systems | Portable Instruments |
Use Scenario: Secondary regulation in multi-rail systems where main 12V/24V bus feeds isolated or non-isolated local converters. IC Role / Device Role / Timing Role: Efficient, low-noise buck converter supplying auxiliary rails for ADCs, DACs, or communication ICs. Use Value: Programmable peak current (via ISET) allows optimization for low-noise operation at partial load; no external compensation simplifies system-level filtering. |
Use Scenario: Battery-powered handheld test equipment requiring long runtime and reliable cold-start from partially depleted Li-ion cells. IC Role / Device Role / Timing Role: Main system regulator converting 7–42V battery pack or adapter input to fixed 3.3V/5V output. Use Value: 4.5V UVLO ensures operation down to single-cell LiFePO₄; 12µA IQ extends battery life by minimizing standby drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMS8E#TRPBF | Same silicon, commercial temperature grade (0°C to 85°C) vs. industrial (–40°C to 125°C) for LTC3642IMS8E#TRPBF. | Not rated for extended temperature operation; unsuitable for outdoor or engine bay deployments. | Select only if ambient operating temperature remains within 0°C–85°C; verify thermal margin with θJA = 40°C/W. |
| LTC3642IDD#TRPBF | Same functionality in 3mm × 3mm DFN package (θJA = 43°C/W); lacks MSOP's exposed pad thermal path to top-side copper. | Lower thermal performance in high-ambient or high-power-density layouts; may require additional PCB copper for equivalent cooling. | Prefer for space-constrained designs where MSOP footprint is incompatible; confirm junction temperature rise under worst-case 50mA load. |
Compared with LTC3642EMS8E#TRPBF, the LTC3642IMS8E#TRPBF offers guaranteed operation to –40°C and 125°C, making it suitable for industrial environments; compared with LTC3642IDD#TRPBF, its MS8E package delivers superior thermal resistance via exposed pad soldering, critical for sustained 50mA output in compact enclosures.
Availability
LTC3642IMS8E#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3642IMS8E#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3642IMS8E#TRPBF belongs to Linear's high-voltage monolithic DC/DC converter family, designed specifically for rugged, low-quiescent-power regulation in industrial and instrumentation applications where input transients, wide VIN range, and extended temperature operation are mandatory.
FAQ
What is the maximum input voltage the LTC3642IMS8E#TRPBF can safely withstand?
The LTC3642IMS8E#TRPBF has an absolute maximum input rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 47V–52V. This allows the device to survive 60V transients without damage while maintaining regulation between 4.5V and 45V - a key feature for industrial and automotive power systems where load dump or inductive kick events occur.
Does the LTC3642IMS8E#TRPBF require external compensation components?
No, the LTC3642IMS8E#TRPBF uses an internally compensated hysteretic control architecture. Unlike traditional voltage-mode or current-mode buck controllers, it does not require external RC networks on the feedback or compensation pins - reducing bill-of-materials count, PCB area, and design validation effort while ensuring stable operation across its full load and input voltage range.
How is the output voltage set for the LTC3642IMS8E#TRPBF?
The LTC3642IMS8E#TRPBF is offered in fixed-output versions (e.g., -3.3, -5) and adjustable variants. For fixed versions, VOUT/VFB (Pin 6) connects directly to the output. For adjustable versions, a resistive divider from VOUT to GND sets the output using VOUT = 0.8V × (1 + R1/R2); the 0.8V internal reference ensures accuracy and low temperature drift across –40°C to 125°C.
What is the purpose of the HYST pin on the LTC3642IMS8E#TRPBF?
The HYST pin (Pin 7) is an open-drain output pulled low when the RUN pin voltage falls below 1.2V. It provides a logic signal indicating shutdown state and can be used with an external resistor to increase effective RUN pin hysteresis - improving noise immunity in electrically noisy industrial environments where the RUN signal may be derived from a resistive divider across a high-voltage rail.
Can the LTC3642IMS8E#TRPBF operate with 100% duty cycle?
Yes, the LTC3642IMS8E#TRPBF supports 100% duty cycle operation, enabling low-dropout regulation where VOUT is close to VIN (e.g., 5V output from a 5.5V source). This extends usable input range and avoids dropout-related brownouts in battery-powered or marginally regulated systems - a capability confirmed in the datasheet's "Low Dropout Operation" feature list and electrical characteristics table.
LTC3642IMS8E#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3642IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IMS8E#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#TRPBF reliable?
The price and inventory of LTC3642IMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IMS8E#TRPBF?
LTC3642IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IMS8E#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#TRPBF?
For technical support, including LTC3642IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3642IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642IMS8E#TRPBF?
All LTC3642IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3642IMS8E#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
