LTC3621HMS8E-3.3#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
LTC3621HMS8E-3.3#PBF is a synchronous step-down switching regulator from Analog Devices with a fixed 3.3 V output, 1 A current capability, 1 MHz switching frequency, and 2.7 V to 17 V input range featuring ultralow quiescent current in an 8-pin MSOP-EP package. From $3.20, in stock, worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LTC3621HMS8E-3.3#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $4.2200(MOQ 19)
- Temp Range
- -40.0°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 3.3 V output with 1 A continuous current supports standard logic, MCU, and RF module power rails directly
- Ultralow quiescent current via pulse-skip mode extends battery life in always-on IoT and portable applications
- 1 MHz switching frequency reduces external inductor and capacitor size, enabling ultra-compact PCB footprints
- Wide 2.7 V to 17 V input range accommodates Li-ion battery, 5 V USB, 12 V automotive, and industrial bus inputs
- Synchronous rectification maximizes conversion efficiency, reducing heat generation at full 1 A load
Applications
The LTC3621HMS8E-3.3#PBF is ideal for battery-powered IoT devices, wearables, and wireless sensor nodes where its ultralow quiescent current in pulse-skip mode minimizes standby drain from Li-ion or primary cells. It efficiently powers 3.3 V microcontrollers, Bluetooth/Wi-Fi SoCs, and sensor front-ends from 12 V industrial rails or 2-cell Li-ion batteries within a small 8-pin MSOP-EP footprint. Its 1 MHz operation enables the use of sub-1 µH inductors and small ceramic capacitors, making it well-suited for space-constrained portable instruments and compact embedded systems.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1662 |
| YTEOL | 10 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE SKIP MODE |
| Input Voltage-Max | 17V |
| Input Voltage-Min | 2.7V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 3.35V |
| Output Voltage-Min | 3.25V |
| Output Voltage-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.19 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 1160kHz |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| 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
Compatible alternatives and drop-in replacements for LTC3621HMS8E-3.3#PBF:
suggested
suggested
Frequently Asked Questions
How does the LTC3621HMS8E-3.3#PBF's pulse-skip mode reduce quiescent current for battery-powered IoT devices?
In pulse-skip mode, the LTC3621HMS8E-3.3#PBF skips switching cycles when the load current falls below the inductor's peak current threshold, reducing switching losses dramatically. This lowers quiescent current to microamp levels at light loads, extending the runtime of battery-operated IoT nodes powered from 3 V to 17 V cells. At a 3.3 V output supplying a sleeping MCU drawing less than 1 mA, efficiency remains above 80%, versus much higher losses in continuous-conduction regulators.
What passive component sizes does the 1 MHz switching frequency of the LTC3621HMS8E-3.3#PBF enable in a compact design?
Operating at 1 MHz, the LTC3621HMS8E-3.3#PBF allows the use of a 2.2 µH to 4.7 µH inductor and 10 µF ceramic output capacitor, both in small 0402 or 0603 case sizes. This reduces total solution footprint to under 25 mm², compared to 100 kHz designs requiring 22 µH to 47 µH inductors in larger 1210 packages, making the LTC3621 well-suited for wearable and miniaturized embedded modules.
Which input voltage rails can the LTC3621HMS8E-3.3#PBF accept to produce a regulated 3.3 V output at 1 A?
The LTC3621HMS8E-3.3#PBF accepts input voltages from 2.7 V to 17 V, covering single-cell Li-ion (3.0 V to 4.2 V), 2-cell Li-ion (6 V to 8.4 V), USB 5 V, 9 V wall adapters, 12 V automotive or industrial bus voltages, and up to 17 V automotive crank transients. This single device consolidates multiple power-tree supply options into one fixed-output 3.3 V regulator, reducing BOM complexity.
How does the LTC3621HMS8E-3.3#PBF's synchronous rectification compare to a diode-rectified buck converter at 1 A output?
Synchronous rectification replaces the catch diode with a low-resistance MOSFET switch, reducing the rectifier voltage drop from approximately 0.4 V to 0.05 V at 1 A. This cuts conduction losses by up to 350 mW at full load, improving efficiency from approximately 85% to over 92% at a 12 V input and 3.3 V/1 A output, and significantly reducing PCB temperature rise in the 8-pin MSOP-EP package during continuous operation.
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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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