MCP73831-2ACISLASHMC datasheet(14/28 Pages) MICROCHIP

14 / 28 page

MCP73831/2

DS20001984G-page 14

 2005-2014 Microchip Technology Inc.

4.5

Fast Charge Constant-Current

Mode

During the Constant-Current mode, the programmed

charge current is supplied to the battery or load. The

charge current is established using a single resistor

from PROG to VSS. Constant-Current mode is

maintained until the voltage at the VBAT pin reaches the

regulation voltage, VREG.

4.6

Constant-Voltage Mode

When the voltage at the VBAT pin reaches the

regulation 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%.

4.7

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.

4.8

Automatic Recharge

The MCP73831/2 continuously monitor the voltage at

the VBAT pin in the Charge Complete mode. If the

voltage 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 Characteristics”

for recharge threshold options and the Product

Identification System for standard options.

4.9

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.

4.10

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 k

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