MCP73831-2ACISLASHMC datasheet(11/24 Pages) MICROCHIP

11 / 24 page

DS21984B-page 11

MCP73831/2

4.5

Constant-Voltage Mode

When the voltage at the VBAT pin reaches the regula-

tion voltage, VREG, constant voltage regulation begins.

The regulation voltage is factory set to 4.2V, 4.35V,

4.40V, or 4.50V with a tolerance of ±0.75%.

4.6

Charge Termination

The charge cycle is terminated when, during Constant-

Voltage mode, the average charge current diminishes

below a percentage of the programmed charge current

(established with the value of the resistor connected to

the PROG pin). A 1 ms filter time on the termination

comparator ensures that transient load conditions do

not result in premature charge cycle termination. The

percentage or ratio of the current is factory set. Refer

to Section

1.0 “Electrical Characteristics” for

charge termination current options and the “Product

Identification System” for standard options.

The charge current is latched off and the MCP73831/2

enter a Charge Complete mode.

4.7

Automatic Recharge

The MCP73831/2 continuously monitor the voltage at

the VBAT pin in the Charge Complete mode. If the volt-

age drops below the recharge threshold, another

charge cycle begins and current is once again

supplied to the battery or load. The recharge threshold

is factory set. Refer to Section 1.0 “Electrical Char-

acteristics” for recharge threshold options and the

Product Identification System for standard options.

4.8

Thermal Regulation

The MCP73831/2 limit the charge current based on

the die temperature. The thermal regulation optimizes

the charge cycle time while maintaining device

reliability. Figure 4-2 depicts the thermal regulation for

the MCP73831/2.

FIGURE 4-2:

Thermal Regulation.

4.9

Thermal Shutdown

The MCP73831/2 suspend charge if the die tempera-

ture exceeds 150°C. Charging will resume when the

die temperature has cooled by approximately 10°C.

150

225

300

375

450

525

Junction Temperature (°C)

RPROG = 2 kΩ

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