MCP73831T-2DCI/OT IC

Technical Specifications of MCP73831T-2DCI/OT

Datasheet	MCP73831T-2DCI/OT datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Battery Chargers
Manufacturer	Microchip Technology
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Battery Chemistry	Lithium-Ion/Polymer
Number of Cells	1
Current – Charging	Constant – Programmable
Programmable Features	Current
Fault Protection	Over Voltage
Charge Current – Max	500mA
Battery Pack Voltage	4.2V
Voltage – Supply (Max)	6V
Interface	–
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5

MCP73831T-2DCI/OT Description

The MCP73831/2 devices are very advanced linear charge management controllers that are made for applications with limited space and a low budget. You can buy the MCP73831/2 in either a DFN package with 8 leads that are 2 mm by 3 mm or a SOT-23 package with 5 leads. The fact that the MCP73831/2 only need a small number of external components and are small makes them a great choice for portable applications. The USB power bus specifications say that the MCP73831/2 meets all the requirements for applications that get power from a USB port. The MCP73831/2 uses a charge algorithm with preconditioning and charge termination that can be set up differently. This algorithm uses a supply with a constant voltage and a constant current.

To meet new and changing needs for charging batteries, constant voltage regulation has been set up with four options. 4.20V, 4.35V, 4.40V, and 4.50V are all possible values. The constant current value is set by using one of the external resistors. When the power is high or the temperature is high, the MCP73831/2 devices limit the charge current based on how hot the die is. Because of this temperature management, the charge cycle time can be as short as possible while keeping the device’s dependability. There are different ways to set the preconditioning threshold, the preconditioning current value, the charge termination value, and the automatic recharge threshold.

The preconditioning value and the charge termination value are set in relation to the programmed constant current value, either as a ratio or a percentage.

MCP73831T-2DCI/OT Features

• Charge Current Programmable: 15 mA to 500 mA.
• High Accuracy Preset Voltage Regulation: + 0.75 percent.
• Power-Down Automatically.
• Temperature control.
• Ranging from -40°C to +85°C.

MCP73831T-2DCI/OT Applications

• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• USB Chargers

Device Overview

Controllers for linear charge management that are really cutting-edge can be found in the MCP73831/2.

● Undervoltage Lockout (UVLO)

The charger stays in Shutdown mode until the input voltage is higher than the UVLO threshold, which is set by an internal UVLO circuit and depends on the high input voltage. A 100 mV hysteresis is part of the UVLO circuitry. If a battery is present when power is applied, the MCP73831/2 won’t start working until the voltage from the power supply is at least 150 mV higher than the voltage from the battery.

When the input supply drops to within +50 mV of the battery voltage, the UVLO circuit sends the device into Shutdown mode. Again, the MCP73831/2 won’t turn on until the voltage from the power supply is at least 150 mV higher than the voltage from the battery. The UVLO circuit works indefinitely. When the input supply falls below the UVLO threshold or is within +50 mV of the VBAT pin, the MCP73831/2 goes into shutdown mode. In all UVLO conditions, reverse discharge draws less than 2 A from the battery.

● Battery Detection

The VBAT pin makes a current that is usually 6 A strong to tell whether there is a battery. If the voltage at VBAT goes up to VREG plus 100 mV, as it often does, the device will think there is no battery. If the voltage stays below VREG plus 100 mV, the device will think there is a battery. (the normal threshold). Before the battery is connected, the VBAT pin needs to see an impedance of more than 2 M for it to be able to detect that a battery has been plugged in.

● Charge Qualification

A charge cycle can’t begin until all UVLO requirements have been met, and either a battery or an output load must be present. Connecting a charge current programming resistor between the PROG and VSS terminals. If the PROG pin is open or floating, the MCP73831/2 is turned off, and when the battery is discharged backward, less than 2 A is drawn from the battery. In this case, the PROG pin acts as a charging switch and can manually turn off the device.

● Fast Charge Constant-Current Mode

When operating in the Constant-Current mode, the charger supplies the load or battery with the charge current that was previously programmed. A single resistor connected from PROG to VSS creates the charge current in the capacitor. The constant-current mode will continue to operate until the voltage reading taken from the VBAT pin exceeds the regulation voltage, which VREG denotes.

● Constant-Voltage Mode

Constant voltage regulation begins when the VBAT pin hits VREG. 4.2V, 4.35V, 4.40V, or 4.50V with 0.75% tolerance is the factory control voltage.

● Charge Termination

When the average charge current drops below a certain percentage of the programmed charge current, the charge cycle is over (established with the value of the resistor connected to the PROG pin). A 1 ms termination comparator filter period prevents the charge cycle from ending too soon because of changing load conditions.

● Automatic Recharge

The MCP73831/2 always checks VBAT voltage in Charge Complete mode. A fresh charge cycle begins when the voltage dips below the charging threshold.

Detailed Description

Analog Circuitry

● Battery Management Input Supply (VDD)

VDD is the input supply pin for MCP73831/2. The MCP73831/2 turns off if the VDD input voltage falls below UVLO (VSTOP). This stops the battery from running down without VDD.

● Battery Charge Control Output (VBAT)

The P-channel MOSFET drain terminals control the battery charge. The MCP73831/2 controls this MOSFET linearly to control the current and voltage in a battery pack. The output of the battery charge control should be linked to the positive terminal of the battery pack.

Digital Circuitry

● Status Indicator (STAT)

High (H), Low (L), and High Impedance (HI) are the charge status outputs of the MCP73831 (High Z). The MCP73832 charge status output is open drain. Low (L) and High-Impedance states (High Z) exist. The charge status output can light up one, two, or three colored LEDs. A host microcontroller can talk to the charge status output.

● Device Disable (PROG)

The current regulation set input pin (PROG) can start, stop, and start charging again. A programming resistor turns the gadget from PROG to VSS. A floating PROG input or a logic-high input signal turns off the device and ends a charge cycle. Devices that are turned off have a supply current of 25 A.

Applications

The MCP73831/2 is made to work with a host microcontroller or independently. The MCP73831/2 has the best way to charge Lithium-Ion and Lithium Polymer batteries. The algorithm uses a charging method with a constant current and voltage.

● Application Circuit Design

Due to its low efficiency, linear charging is most important for its thermal design and cost, which depend on the input voltage, output current, and thermal impedance between the battery charger and the air around it. When the device switches from Preconditioning to Constant-Current, that is the worst thing that can happen. Here, the battery charger must lose as much power as possible. Charge current, cost, and the amount of heat needed must all be in balance.

● Current Programming Resistor (RPROG)

A current with a rate of 1C is recommended for rapidly charging Lithium-Ion cells, while a current with a rate of 2C provides the greatest possible charge. For instance, a battery pack with a capacity of 500 mAh has a recommended rapid charge current of 500 mA. When charging at this rate, the battery pack will have the shortest charge cycle durations without reducing its performance or lifespan.

Conclusion

In conclusion, the MCP73831T-2DCI/OT charge controller is a very effective tool that makes your battery work at its best. It is perfect for power management because it has an output voltage of 4.2 V and a current range of 15 to 500 mA. The part comes on a tape and reel, which makes it easy to install and keeps it safe during shipping. It works with both Li-Ion and Li-Pol batteries, and the supply voltage can be anywhere from 3.75 V to 6 V. This charge controller can work in temperatures from -40°C to 85°C and can be used for a wide range of tasks. To order this product or for further information, please contact ICRFQ, the leading electronic distributor in China, for the best goods at a reasonable price.

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