LTC4121EUD#TRPBF
ActiveBATTERY CHARGER, LEAD ACID/LIFEPO4/LI-ION/POL, 3.5V TO 18V/421 MA CHARGE, -40 TO 125 DEG C, QFN-16
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LTC4121EUD#TRPBF
ActiveBATTERY CHARGER, LEAD ACID/LIFEPO4/LI-ION/POL, 3.5V TO 18V/421 MA CHARGE, -40 TO 125 DEG C, QFN-16
Deep-Dive with AI
Technical Specifications
Parameters and characteristics for this part
| Specification | LTC4121EUD#TRPBF |
|---|---|
| Battery Chemistry | Multi-Chemistry |
| Battery Pack Voltage | 18 V |
| Charge Current - Max [Max] | 400 mA |
| Current - Charging | Constant - Programmable |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 125 ¯C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 16-WFQFN Exposed Pad |
| Supplier Device Package | 16-QFN (3x3) |
| Voltage - Supply (Max) [Max] | 40 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 9.32 | |
| 10 | $ 6.45 | |||
| 25 | $ 5.71 | |||
| 100 | $ 4.88 | |||
| 250 | $ 4.48 | |||
| 500 | $ 4.23 | |||
| 1000 | $ 4.03 | |||
| Digi-Reel® | 1 | $ 9.32 | ||
| 10 | $ 6.45 | |||
| 25 | $ 5.71 | |||
| 100 | $ 4.88 | |||
| 250 | $ 4.48 | |||
| 500 | $ 4.23 | |||
| 1000 | $ 4.03 | |||
| Tape & Reel (TR) | 2500 | $ 3.92 | ||
| Newark | Each (Supplied on Cut Tape) | 1 | $ 8.92 | |
| 10 | $ 6.01 | |||
| 25 | $ 5.25 | |||
| 50 | $ 4.83 | |||
| 100 | $ 4.40 | |||
| 250 | $ 4.04 | |||
| 500 | $ 3.93 | |||
Description
General part information
LTC4121LTC4121-4.2 Series
The LTC4121 is a 400mA constant-current/constantvoltage (CC/CV) synchronous step-down battery charger. In addition to CC/CV operation, the LTC4121 regulates its input voltage to a programmable percentage of the input open-circuit voltage. This technique maintains maximum power transfer with high impedance input sources such as solar panels.An external resistor programs the charge current up to 400mA. The LTC4121-4.2 is suitable for charging Li-Ion/ Polymer batteries, while the programmable float voltage of the LTC4121 is suitable for several battery chemistries.The LTC4121 and LTC4121-4.2 include an accurate RUN pin threshold, low voltage battery preconditioning and bad battery fault detection, timer termination, auto-recharge, and NTC temperature qualified charging. TheFAULTpin provides an indication of bad battery or temperature faults.Once charging is terminated, the LTC4121 signals end-ofcharge via theCHRGpin, and enters a low current SLEEP mode. An auto-restart feature starts a new charging cycle if the battery voltage drops by 2.2%.ApplicationsHandheld InstrumentsSolar Powered DevicesIndustrial/Military Sensors and Devices
Documents
Technical documentation and resources