AN2370

Programming charge current

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9

Programming charge current

The charge current is programmed using a single resistor from the PROG pin to ground.

The battery charge current is 1000 times the current out of the PROG pin. The program

resistor value is calculated using the following equation:

Equation 8

The charge current out of the BAT pin can be determined at any time by monitoring the

PROG pin voltage using the following equation:

Equation 9

10

Revision history

R

PROG

1000

1.00 V

I

BAT

----------------

•

=

I

BAT

V

PROG

R

PROG

-------------------

1000

•

=

Table 3.

Document revision history

Date

Revision

Changes

3-Aug-2006

1

Initial release

07-Sep-2006

2

Minor text changes

19-Sep-2006

3

Table 2 changed

05-Oct-2007

4

Changed Figure 1, Figure 3, Figure 4 and Figure 5