LTC3642EMS8E-5#TRPBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
The Analog Devices LTC3642EMS8E-5#TRPBF is an automotive-grade synchronous step-down (buck) DC-DC converter with a wide 4.5V to 45V input range and fixed 5V output at up to 50mA, featuring burst-mode current control for ultra-low quiescent current. Housed in an 8-pin MSOP with exposed pad, it delivers high efficiency across a broad input voltage range. Suitable for automotive always-on power rails, industrial 24V/48V bus-powered microcontroller supplies, and harsh-environment sensor nodes.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LTC3642EMS8E-5#TRPBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.6700(MOQ 1)
- Temp Range
- ?°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Wide 4.5V to 45V input range supports automotive 12V/24V battery rails, 48V mild-hybrid systems, and industrial 24V/48V bus supplies in a single design
- Fixed 5V output at up to 50mA provides a regulated microcontroller and sensor supply directly from high-voltage bus without external pass elements
- Burst-mode current-mode control minimizes quiescent current to microamp-level for always-on automotive standby applications
- Synchronous step-down topology with integrated power switches achieves high conversion efficiency without external Schottky diodes
- Automotive-grade 8-pin MSOP with exposed thermal pad enables compact, thermally efficient layout in space-constrained under-hood electronics
Applications
The LTC3642EMS8E-5#TRPBF is designed for automotive body electronics and in-vehicle infotainment subsystems where an always-on 5V microcontroller supply must be derived directly from a 12V or 24V automotive battery, including during cold-crank conditions where input voltage may momentarily drop to 4.5V. Its 45V input rating also accommodates load dump transients and 48V mild-hybrid electrical systems without additional clamping components. Beyond automotive use, this converter is well-suited for industrial field devices, PLC I/O modules, and sensor nodes powered from 24V DIN-rail supplies that need a local 5V logic rail consuming only tens of milliamps.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1662 |
| YTEOL | 10 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | BURST MODE |
| Input Voltage-Max | 45V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 10V |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.05A |
| Output Voltage-Max | 5.06V |
| Output Voltage-Min | 4.91V |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Technology | CMOS |
| Temperature Grade | OTHER |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LTC3642EMS8E-5#TRPBF handle automotive load dump transients on the 12V vehicle bus?
The LTC3642EMS8E-5#TRPBF is rated for a maximum input voltage of 45V, which provides direct protection against ISO 7637 Class B automotive load dump transients that can reach 35V to 40V on a nominal 12V battery bus. This eliminates the need for an external transient voltage suppressor (TVS) diode on the input in most standard 12V automotive body electronics applications, reducing component count and BOM cost compared to converters rated only to 20V or 24V that require additional clamping.
What is the typical efficiency of LTC3642EMS8E-5#TRPBF when stepping from 12V automotive input to 5V output at 50mA load?
At 12V input to 5V output at 50mA, the LTC3642EMS8E-5#TRPBF synchronous buck converter achieves typical efficiency above 80%, compared to 41% for a linear regulator in the same conversion scenario (5V/12V = 41.7%). This 40-percentage-point efficiency advantage translates directly to lower power dissipation — approximately 50mW wasted heat versus 350mW for a linear equivalent — which is significant in sealed automotive ECU enclosures where thermal management without heatsinks or forced air cooling is required.
What output capacitor and inductor values are recommended for stable operation of the LTC3642EMS8E-5#TRPBF at 5V/50mA from a 24V industrial supply?
For stable operation at 5V output from a 24V input at up to 50mA, Analog Devices recommends a 10µH inductor with DCR below 1Ω (such as a 4mm x 4mm shielded ferrite inductor rated for 150mA saturation current) and a 10µF ceramic output capacitor (X5R or X7R, 10V rating minimum). The 10µH inductance value is optimized for the LTC3642's burst-mode switching frequency, balancing ripple current magnitude (typically 20mA peak-to-peak) against inductor size and cost. A 4.7µF to 10µF ceramic input capacitor placed within 5mm of the VIN pin completes the solution.
When does the LTC3642EMS8E-5#TRPBF enter burst mode, and how does this affect output voltage ripple in a 5V MCU supply application?
The LTC3642EMS8E-5#TRPBF enters burst mode automatically when the load current falls below approximately 5mA to 10mA, switching in discrete energy packets rather than continuously to minimize gate charge switching losses and reduce quiescent current to under 60µA. During burst mode at light loads, output voltage ripple increases to approximately 20mV to 50mV peak-to-peak depending on output capacitor value, which is within the ±5% regulation tolerance of most 5V microcontrollers (typically ±250mV). Adding a 22µF to 47µF bulk capacitor in parallel with the 10µF ceramic reduces burst-mode ripple to under 20mV for more sensitive analog circuits.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $5.1300 | $5.13 |
| 19+ | $4.8600 | $92.34 |
| 1000+ | $3.6700 | $3670.00 |
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