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Analog Devices Inc. LTC3642EMS8E-5#PBF
- Part No.:
- LTC3642EMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3642EMS8E-5#PBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LTC3642EMS8E-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, tolerates 60V transients, and draws only 12µA quiescent current in Burst Mode® operation - enabling long battery life in portable instrumentation and industrial sensor nodes.
For engineers reviewing the LTC3642EMS8E-5#PBF datasheet, LTC3642EMS8E-5#PBF pinout, LTC3642EMS8E-5#PBF application, or LTC3642EMS8E-5#PBF equivalent, key selection criteria include its programmable peak current limit (25–115mA), precise RUN pin threshold (1.21V rising), internal soft-start (0.75ms default), and thermally enhanced MS8E package optimized for high ambient temperature environments.
Technical Context
The LTC3642EMS8E-5#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback reference and 5mV comparator hysteresis, enabling automatic transition between active switching and ultra-low-power sleep cycles. Its peak-current-limited regulation uses a user-programmable ISET pin (1µA sourced) to set trip thresholds from 25mA to 115mA, directly determining maximum average output current (up to 50mA).
Startup is managed by a precision RUN comparator (1.21V enable threshold, 110mV hysteresis) and dual soft-start capability - internal (0.75ms) or external via SS pin (5µA sourced). The device integrates overvoltage lockout (47V rising) and undervoltage lockout (3.8V rising), sustaining 60V input surges without damage while maintaining regulation across automotive and industrial supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive supplies; withstands 60V transients without shutdown. |
| Output Voltage | Fixed 5.0V ±1.5% - guaranteed over –40°C to 125°C junction temperature; no external feedback divider required. |
| Max Output Current | 50mA - derived from 100mA peak inductor current limit; sufficient for powering microcontrollers, sensors, and interface ICs. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery operation in always-on remote monitoring systems. |
| Feedback Reference | 0.800V ±1% - high-precision internal reference enables accurate output regulation independent of external resistor tolerance. |
| Run Threshold | 1.21V rising / 1.10V falling - precise enable/disable control with 110mV hysteresis prevents chatter during brown-in/brown-out conditions. |
| Package Thermal Resistance | θJA = 40°C/W - thermally enhanced MS8E package with exposed GND pad ensures stable operation at full load in compact enclosures. |
Pinout & Package
The LTC3642EMS8E-5#PBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed thermal pad (Pin 9), requiring soldering to PCB ground for optimal thermal and electrical performance. Pin pitch is 0.65mm; package dimensions are 3mm × 3mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching waveform; requires tight layout to minimize EMI and voltage spikes. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; must be bypassed with ≥1µF ceramic capacitor close to pin for stability and transient response. |
| ISET (Pin 3) | Peak current programming | 1µA current source sets peak inductor current (25–115mA); resistor-to-GND configures load-dependent efficiency optimization. |
| SS (Pin 4) | Soft-start control | 5µA current source charges external capacitor; determines output voltage ramp time and limits inrush current during startup. |
| RUN (Pin 5) | Enable/disable control | Logic-level input: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); hysteresis prevents oscillation near threshold. |
| VOUT/VFB (Pin 6) | Output feedback | Direct connection to 5V output; monitors regulation via internal 0.8V reference; low leakage (<10nA) preserves light-load efficiency. |
| HYST (Pin 7) | Run hysteresis open-drain | Pulled low when RUN <1.2V; used externally to increase RUN pin hysteresis or coordinate sequencing with other rails. |
| GND (Pin 8 + Exposed Pad 9) | Power and signal ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Internal control loop stability eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Low dropout operation | 100% duty cycle capability allows regulation down to VIN ≈ VOUT + dropout - critical for battery-powered systems nearing end-of-life. |
| Adjustable peak current limit | Resistor-programmable ISET pin enables optimization of inductor size, ripple, and efficiency for specific load profiles (e.g., 25mA for sensor bias, 115mA for MCU wake-up bursts). |
| Precise RUN threshold with hysteresis | 1.21V enable threshold and 110mV hysteresis ensure clean, chatter-free power sequencing in noisy industrial environments. |
| Thermally enhanced MS8E package | Exposed GND pad and θJA = 40°C/W enable full 50mA output at 125°C junction temperature without derating - suitable for sealed enclosures. |
Applications
| Industrial Sensor Nodes | Automotive Body Electronics |
|---|---|
Use Scenario: Remote temperature/humidity sensors powered by 12V vehicle battery or 24V industrial bus with intermittent wireless transmission. IC Role / Device Role / Timing Role: Primary 5V regulator supplying MCU, RF transceiver, and analog front-end; manages power cycling via RUN pin control. Use Value: 12µA quiescent current extends battery life to >5 years; 60V surge tolerance prevents field failures from load-dump events. | Use Scenario: Powering LIN bus transceivers, door module MCUs, and LED drivers in passenger compartment modules. IC Role / Device Role / Timing Role: Point-of-load regulator converting unregulated 9–16V battery rail to stable 5V for digital logic and communication interfaces. Use Value: Wide 4.5V–45V input range accommodates cold-crank (6.5V) and load-dump (35V+) conditions without external protection circuitry. |
| Portable Test Equipment | 4–20mA Loop-Powered Devices |
Use Scenario: Handheld multimeters and oscilloscopes operating from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Efficient 5V supply enabling low-noise ADC references and display backlight drivers during measurement bursts. Use Value: Burst Mode® operation maintains >85% efficiency at 1mA load while drawing only 12µA - preserving battery capacity during standby. | Use Scenario: Smart pressure/flow transmitters powered entirely from 4–20mA current loop with minimal headroom. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down converter extracting regulated 5V from loop voltage drop across 250Ω shunt resistor. Use Value: 12µA IQ enables operation down to 3.8V input (4mA × 250Ω = 1V drop + 2.8V min VIN), maximizing usable loop voltage range. |
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 |
|---|---|---|---|
| TPS62840DLCR | Lower input range (1.8V–6.5V); 300nA IQ; 1A output; no 60V surge tolerance | Suitable only for low-voltage battery systems; cannot replace LTC3642EMS8E-5#PBF in 12V/24V/48V industrial or automotive rails | Select only if input voltage never exceeds 6.5V and sub-µA IQ is mandatory - not a functional substitute for LTC3642EMS8E-5#PBF's high-voltage capability. |
| MAX17503GEE+T | 4.5V–60V input; 200mA output; 120µA IQ; requires external compensation | Higher output current and wider input range, but 10× higher quiescent current compromises battery life in always-on applications | Prefer when >50mA load or tighter input transient margin (>60V) is needed; accept trade-off in standby power consumption. |
Compared with TPS62840DLCR and MAX17503GEE+T, the LTC3642EMS8E-5#PBF uniquely balances 45V max input, 60V surge tolerance, 50mA output, and 12µA IQ in a thermally robust MS8E package - making it optimal for space-constrained, battery-backed industrial sensors where both high-voltage resilience and multi-year runtime are required.
Availability
LTC3642EMS8E-5#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, portable test equipment, and 4–20mA loop-powered devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3642EMS8E-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3642EMS8E-5#PBF belongs to ADI's legacy Linear Technology high-voltage DC/DC converter product line, designed specifically for reliable, low-quiescent-power regulation in harsh environments - including battery-powered instrumentation, distributed industrial controls, and automotive subsystems.
FAQ
What is the maximum input voltage the LTC3642EMS8E-5#PBF can safely withstand?
The LTC3642EMS8E-5#PBF has an absolute maximum input rating of 60V and includes internal overvoltage lockout that disables switching above 47V (rising). This allows the device to survive automotive load-dump transients and industrial power surges without external protection components, while maintaining regulation from 4.5V to 45V during normal operation. The 60V rating applies to short-duration transients only; continuous operation above 45V is not supported.
Does the LTC3642EMS8E-5#PBF require external compensation components?
No, the LTC3642EMS8E-5#PBF does not require external compensation components. Its hysteretic Burst Mode® control architecture and integrated power switches provide inherent loop stability across the full load and input voltage range. This eliminates the need for external RC networks or type-II/type-III compensators - reducing bill-of-materials cost, PCB area, and design validation effort compared to voltage-mode or current-mode controllers.
How is the output current capability of the LTC3642EMS8E-5#PBF determined?
The LTC3642EMS8E-5#PBF delivers up to 50mA continuous output current, derived from its programmable peak inductor current limit (25–115mA). For the fixed 5V version, maximum average output current equals half the peak current - so 100mA peak yields 50mA average. The actual achievable current depends on input voltage, inductor value, and thermal conditions; at 45V input and full load, thermal limits in the MS8E package define the practical ceiling.
Can the LTC3642EMS8E-5#PBF be used in 4–20mA loop-powered applications?
Yes, the LTC3642EMS8E-5#PBF is well-suited for 4–20mA loop-powered devices. With only 12µA quiescent current in Burst Mode®, it minimizes voltage drop across the 250Ω shunt resistor - enabling operation down to ~3.8V input (4mA × 250Ω = 1V drop + 2.8V min VIN). Its wide input range accommodates varying loop voltages, and the RUN pin allows controlled power-up sequencing synchronized with loop current detection.
What is the purpose of the HYST pin on the LTC3642EMS8E-5#PBF?
The HYST pin on the LTC3642EMS8E-5#PBF is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V. It provides a direct indicator of operational state and can be used to increase effective RUN pin hysteresis by connecting it to the RUN node through a resistor divider. This enables robust power sequencing in noisy environments and simplifies coordination with other system rails or supervisory circuits without additional discrete logic.
LTC3642EMS8E-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
LTC3642EMS8E-5#PBF FAQ
1.How can I place an order for LTC3642EMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EMS8E-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 LTC3642EMS8E-5#PBF reliable?
The price and inventory of LTC3642EMS8E-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 LTC3642EMS8E-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642EMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EMS8E-5#PBF?
LTC3642EMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EMS8E-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 LTC3642EMS8E-5#PBF?
For technical support, including LTC3642EMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EMS8E-5#PBF requirements.
6.How does Aetrix verify that LTC3642EMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EMS8E-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 LTC3642EMS8E-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642EMS8E-5#PBF?
All LTC3642EMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EMS8E-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 LTC3642EMS8E-5#PBF part is unused and in its original packaging.
Return procedure for LTC3642EMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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