Drive

Logic

To

ISET2

R1

R2

ToISET2

Q1

Q2

Drive

Logic

R1Divider

setto0.9V

Whichisthe

FloatVoltage

OR

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

100

1000

10000

I

-

SET

W

I

InternalClampRange

OUT

I

Short

Fault

Range

SET

NonRestricted

Operating Area

I

Programmed

OUT

min

max

bq24090, bq24091

bq24092, bq24093

bq24095

www.ti.com

SLUS968D – JANUARY 2010 – REVISED DECEMBER 2012

Figure 22. Programmed/Clamped Out Current

PRE_TERM – Pre-Charge and Termination Programmable Threshold

Pre-Term is used to program both the pre-charge current and the termination current threshold. The pre-charge

current level is a factor of two higher than the termination current level. The termination can be set between 5%

and 50% of the programmed output current level set by ISET. If left floating the termination and pre-charge are

(2)

(2)

Where:

%Term is the percent of fast charge current where termination occurs;

%Pre-CHG is the percent of fast charge current that is desired during precharge;

ISET2

Is a 3-state input and programs the Input Current Limit/Regulation Threshold. A low will program a regulated fast

charge current via the ISET resistor and is the maximum allowed input/output current for any ISET2 setting, Float

will program a 100mA Current limit and High will program a 500mA Current limit.

Below are two configurations for driving the 3-state ISET2 pin:

Copyright © 2010–2012, Texas Instruments Incorporated

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