LTC4121EUD-4.2#PBF Analog Devices Integrated Circuit (Quad Flat No-Lead) In Stock
Analog Devices LTC4121EUD-4.2#PBF is a 40V, 400mA synchronous step-down Li-ion battery charger in 16-lead QFN, offering programmable charge current, wide input range, and autonomous charging control for embedded systems.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- LTC4121EUD-4.2#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.6100(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 LTC4121EUD-4.2#PBF?
- 40 V input rating handles automotive and industrial supply rails with wide voltage swings
- 400 mA synchronous step-down topology delivers high efficiency charging with low heat dissipation
- Fixed 4.2 V charge termination voltage factory-programmed for single-cell Li-ion batteries
- Autonomous charger operation requires no host MCU, simplifying firmware and reducing BOM
What is LTC4121EUD-4.2#PBF used for?
The LTC4121EUD-4.2#PBF is designed for embedded systems that harvest energy from solar panels, automotive 12 V rails, or wide-range DC sources to charge a single-cell 4.2 V Li-ion battery. Its 40 V input tolerance makes it suitable for industrial remote sensors and portable field instruments powered from unregulated supplies. The autonomous operation mode enables battery backup solutions and IoT edge nodes that must charge reliably without microcontroller supervision.
What are the specifications of LTC4121EUD-4.2#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1691 |
| YTEOL | 8.5 |
| Adjustable Threshold | YES |
| Analog IC - Other Type | LINEAR BATTERY CHARGER |
| JESD-30 Code | S-PQCC-N16 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC16,.12SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Voltage-Max (Vsup) | 40V |
| Supply Voltage-Min (Vsup) | 4.4V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Threshold Voltage-Nom | +2.21V |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
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 | Thailand |
Where can I find the LTC4121EUD-4.2#PBF datasheet?
LTC4121EUD-4.2#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LTC4121EUD-4.2#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does the LTC4121EUD-4.2#PBF support for solar or automotive charging?
The LTC4121EUD-4.2#PBF accepts input voltages from approximately 3.3 V up to 40 V, making it directly compatible with 12 V automotive rails, 24 V industrial bus voltages, and small solar panels, all while charging a single-cell 4.2 V Li-ion battery at up to 400 mA.
How is the charge current configured on the LTC4121EUD-4.2#PBF?
Charge current on the LTC4121EUD-4.2#PBF is set by a single external resistor connected to the PROG pin; selecting a 10 kΩ resistor programs roughly 100 mA, and scaling down to 2.5 kΩ achieves the full 400 mA, enabling flexible charge rates for batteries from 100 mAh to over 1 Ah capacity.
Does the LTC4121EUD-4.2#PBF require a microcontroller to manage the charge cycle?
No, the LTC4121EUD-4.2#PBF operates autonomously through its complete constant-current and constant-voltage charge algorithm, automatically transitioning through pre-charge, bulk charge, and termination phases without any firmware intervention, which simplifies designs for standalone IoT nodes or backup battery systems with 16-pin QFN footprint.
When would the LTC4121EUD-4.2#PBF be preferred over a lower-voltage charger IC for an industrial sensor?
Whenever the power source exceeds 6 V — such as a 12 V industrial rail or a 10 V to 18 V solar array — the 40 V input rating of the LTC4121EUD-4.2#PBF removes the need for a separate pre-regulator stage, saving at least one conversion stage and reducing system losses by several percentage points compared to cascaded 5 V or 6 V input charger solutions.
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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+ | $9.0800 | $9.08 |
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| 1000+ | $3.6100 | $3610.00 |
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