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Datasheets for lm317.pdf datasheets/lm350.pdf datasheet-max1551-1555.pdf datasheet-lp2951.pdf datasheet-mcp73831.pdf datasheet-4054.pdf datasheet-tp4056.pdf datasheet-1734.pdf datasheet-mcp73812.pdf datasheet-ncp1835.pdf

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NCP1835 Charger

A fully integrated solution is offered  by NCP1835B, providing high stability of the charging voltage (4.2 ± 0.05 V). Perhaps the only drawback of this microcircuit is its too tiny size (DFN-10 case, size 3×3 mm). Not everyone is able to provide high-quality soldering of such miniature elements. Of the indisputable advantages I would like to note the following: 1. …

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LTC1734 Charger

Also very simple scheme. The charge current is set by the resistor R_prog (for example, if you put a 3 kΩ resistor, the current will be 500 mA). Chips are usually labeled on the case: LTRG (they can often be found in old phones from Samsung). The transistor will suit any pnp in general, as long as it is designed …

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TP4056 Charger

The microcircuit is made in the SOP-8 package (see datasheet ), has a metal heat sink on its belly that is not connected to the contacts, which allows for more efficient heat removal. Allows you to charge the battery with current up to 1A (current depends on the current-carrying resistor). The connection scheme requires the very minimum of mounted elements: …

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LTC4054 Charger

Very simple scheme, great option! Allows you to charge a current of up to 800 mA (see the description of the datasheet ). True, it tends to become very hot, but in this case, the built-in overheating protection reduces the current. The scheme can be significantly simplified by throwing out one or even both LEDs with a transistor. Then it …

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MCP73831 Charger

Chip allows you to create the right chargers, moreover, it is cheaper than the untwisted MAX1555. A typical wiring diagram is taken from the datasheet : An important advantage of the circuit is the absence of low-impedance power resistors that limit the charge current. Here, the current is set by a resistor connected to the 5th pin of the chip. …

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LP2951 Charger

Stabilizer LP2951 is manufactured by National Semiconductors (datasheet). It provides the implementation of the built-in current limiting function and allows generating a stable charge voltage level of a lithium-ion battery at the circuit output. The magnitude of the charge voltage is 4.08 – 4.26 volts and is set by resistor R3 when the battery is disconnected. Voltage is held very …

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MAX1551 Charger

MAX1551 / MAX1555 – specialized chargers for Li + batteries that can operate from USB or from a separate power adapter (for example, a charger from the phone). The maximum input voltage from the DC adapter is 7 V, when powered from USB it is 6 V. When the supply voltage drops 3.52 V, the chip turns off and the …

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LM317 Charger(3,7V)

Scheme of a simple charger based on the LM317 chip with a charge state indicator: The scheme is the simplest, the whole setup is reduced to setting the output voltage of 4.2 volts using the trimming resistor R8 (without the battery connected!) And setting the charge current by matching the resistors R4, R6. Power resistor R1 – not less than …

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Charging Li-ion batteries

The most correct way to charge lithium batteries is to charge in two stages. This method is used by Sony in all its chargers. Despite the more complex charge controller, it provides a more complete charge of li-ion batteries, without reducing their service life. Here we are talking about a two-stage charge profile of lithium batteries, abbreviated as CC/CV (constant …

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