Rainbow-electronics MAX1873 Manuel d'utilisateur télécharger pdf (Page 3)

MAX1873

Simple Current-Limited Switch-Mode

Li+ Charger Controller

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 18V, V

ICHG/EN

= V

REF

, V

VADJ

= V

REF

/2. MAX1873R: V

BATT

= V

CSB

= 8.4V;

MAX1873S: V

BATT

= V

CSB

= 12.6V; MAX1873T: V

BATT

= V

CSB

= 16.8V; T

= 0°C to +85°C. Typical values are at T

= +25°C, unless

otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

2-cell version MAX1873R 10.45 11 11.55

3-cell version MAX1873S 15.675 16.5 17.325BATT Overvoltage Cutoff Threshold

4-cell version MAX1873T (Note 1) 17.575 18.5 19.425

VADJ

= 0 7.898 7.958 8.018

VADJ

= V

REF

/2 8.337 8.4 8.463

MAX1873R

(2 Li+ cells)

VADJ

= V

REF

(Note 1) 8.775 8.842 8.909

VADJ

= 0 11.847 11.937 12.027

VADJ

= V

REF

/2 12.505 12.6 12.695

MAX1873S

(3 Li+ cells)

VADJ

= V

REF

(Note 1) 13.163 13.263 13.363

VADJ

= 0 15.796 15.916 16.036

VADJ

= V

REF

/2 16.674 16.8 16.926

Battery Regulation Voltage

MAX1873T

(4 Li+ cells)

VADJ

= V

REF

(Note 1) 17.551 17.684 17.817

MAX1873R 4.8 5.0 5.2

MAX1873S 7.2 7.5 7.8

BATT Undervoltage Threshold

For I

CHG

/20 trickle

charge

MAX1873T 9.6 10 10.4

CURRENT SENSE

ICHG/EN

= V

REF

190 200 210

CSB to BATT Battery Current-Sense

Voltage

ICHG/EN

= V

REF

/4 40 50 60

CSB to BATT Current-Sense Voltage

when V

BATT

< 2.5V per Cell

51015mV

CSSP to CSSN Current-Sense Voltage 6V < V

CSSP

< 28V 90 100 110 mV

CONTROL INPUTS/OUTPUTS

ICHG/EN Input Threshold Includes 50mV of hysteresis 500 600 700 mV

ICHG/EN Input Voltage Range For

Charge Current Adjustment

700 V

REF

VADJ Input Current V

VADJ

= V

REF

/2 -100 100 nA

ICHG/EN Input Current V

ICHG/EN

= V

REF

-100 100 nA

VADJ Input Voltage Range 0V

REF

Full scale

CSB

- V

BATT

= 200mV,

0 < I

OUT

< 500µA

3.6 4.0 4.4

25% scale

CSB

- V

BATT

= 50mV,

0 < I

OUT

< 500µA

0.9 1.0 1.1

Trickle charge V

CSB

- V

BATT

= 10mV 75 200 325

IOUT Voltage

No charge

current

CSB

- V

BATT

= 0,

IOUT

= sinking 20µA

40 70 90

1 2 3 4 5 6 7 8 ... 13 14

Li+ Charger Controller 1

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Rainbow-electronics MAX1873 Manuel d'utilisateur Page 3

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