LTC3632IMS8E#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
The Analog Devices LTC3632IMS8E#PBF is an automotive-grade synchronous step-down DC-DC converter supporting 4.5V to 50V input and 0.8V to 50V adjustable output at up to 20 mA in an 8-pin MSOP-EP package. Available from stock worldwide with competitive pricing.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LTC3632IMS8E#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.9000(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LTC3632IMS8E#PBF?
- 4.5V to 50V wide input voltage range covers automotive cold-crank (4.5V) through load-dump (40V+) and industrial 48V bus systems in a single design
- Hysteretic current-mode control enables fast transient response without external loop compensation components, simplifying the design and reducing BOM count
- Adjustable output from 0.8V to 50V with ±1% reference accuracy supports precision bias rails for op-amps, ADC references, and microcontroller cores from a high-voltage bus
- Synchronous buck topology with integrated high-side and low-side MOSFETs achieves high efficiency across the full load range from microamps to 20 mA
- Automotive-grade (I suffix) qualification with -40°C to +125°C operation meets AEC-Q100 design requirements for in-vehicle ECU power management
What is LTC3632IMS8E#PBF used for?
The LTC3632IMS8E#PBF is designed to generate low-current precision bias rails—such as 3.3V, 5V, and adjustable analog reference voltages—directly from 12V or 48V automotive battery and bus rails in ECUs, ADAS sensors, and telematics modules where the input voltage varies from 4.5V during cold-crank to 40V during load-dump. Its wide input range and no-external-compensation design also make it effective in industrial 24V and 48V distributed power systems supplying bias power to op-amps, digital isolators, and precision ADC reference pins. The compact MSOP-EP package with exposed pad allows efficient heat dissipation despite the small 3 mm × 5 mm footprint, fitting easily on space-constrained sensor PCBs.
What are the specifications of LTC3632IMS8E#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1662 |
| YTEOL | 10 |
| Additional Feature | ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 50V |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | HYSTERETIC CURRENT MODE |
| Input Voltage-Max | 50V |
| 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 | 0.02A |
| Output Voltage-Max | 50V |
| Output Voltage-Min | 0.8V |
| 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 |
| Supply Current-Max (Isup) | 0.22mA |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| 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 |
| Country of Origin | Malaysia |
Where can I find the LTC3632IMS8E#PBF datasheet?
LTC3632IMS8E#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LTC3632IMS8E#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LTC3632IMS8E#PBF handle the full 4.5V to 50V automotive input range including cold-crank and load-dump conditions?
The LTC3632IMS8E#PBF is rated for continuous operation from 4.5V to 50V at the input, covering the worst-case automotive voltage extremes: 4.5V during engine cold-crank when the battery dips below 6V, and 40V to 50V during a load-dump transient when the alternator field is suddenly disconnected at highway speeds. Internal high-voltage MOSFETs handle the full 50V without an external protection circuit, and the hysteretic control loop maintains regulated output during the voltage step-change without saturating or losing lock, ensuring uninterrupted supply to connected sensors or processors.
What output voltage range and accuracy does the LTC3632IMS8E#PBF support for precision analog bias generation?
The output is adjustable from 0.8V to 50V using an external resistor divider, with the internal reference voltage accurate to ±1% across the -40°C to +125°C automotive temperature range. For a 3.3V output from a 12V rail, two resistors of 287 kΩ and 100 kΩ set the feedback node, yielding an output accuracy of ±33 mV—sufficient for biasing 12-bit ADC reference inputs where supply sensitivity is typically 50 mV or better. The 0.8V minimum output also allows direct generation of sub-1V digital core voltages for low-power microcontrollers.
Why does the hysteretic current-mode control in LTC3632IMS8E#PBF eliminate the need for external loop compensation components?
Hysteretic control regulates output voltage by comparing the inductor current and output ripple directly to a hysteresis band, toggling the switches without a traditional error amplifier and compensation network (Rbias, Cbias, Cc). This removes the 3 to 5 passive components required for Type-II or Type-III compensation in conventional current-mode converters, reducing BOM by 3 to 4 parts and PCB area by approximately 10 mm², while simultaneously providing sub-microsecond transient response to load steps at 20 mA because the control reacts to instantaneous inductor current rather than an integrated error signal.
What efficiency and thermal performance does LTC3632IMS8E#PBF achieve in a 48V-to-5V step-down at 15 mA?
In a 48V-to-5V conversion at 15 mA, the synchronous topology with integrated MOSFETs achieves typical conversion efficiency of 80% to 85% at this light load, dissipating approximately 17 mW to 26 mW of heat in the package. The MSOP-EP exposed pad conducts heat to a copper pour on the PCB; with a 100 mm² copper island on a 2-layer board, thermal resistance to ambient is approximately 60°C/W to 80°C/W, keeping junction temperature below 50°C above ambient—well within the 125°C limit even at 85°C ambient in an automotive engine bay.
In what scenario is LTC3632IMS8E#PBF preferred over a linear LDO for generating a 5V bias rail from a 48V automotive bus?
A linear LDO generating 5V from 48V at 15 mA dissipates (48V - 5V) × 15 mA = 645 mW as heat, requiring a large power dissipation package or heatsink and significantly increasing junction temperature. The LTC3632IMS8E#PBF at 80% efficiency dissipates only about 160 mW in total, reducing heat by 4× and allowing use of the compact MSOP-8 package without any heatsink, a critical advantage in thermally constrained ADAS sensor modules where PCB area for thermal copper pours is less than 200 mm².
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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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|---|---|---|
| 1+ | $10.4000 | $10.40 |
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