Rainbow-electronics MAX1873 Manual do Utilizador descarregar pdf (Página 6)

MAX1873

Simple Current-Limited Switch-Mode

Li+ Charger Controller

6 _______________________________________________________________________________________

Typical Operating Characteristics

(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

= +25°C, unless otherwise noted).

5.0

2.5

10.0

7.5

15.0

12.5

17.5

0 1.0 1.50.5 2.0 2.5 3.0 3.5

MAX1873T (4-CELL)

BATTERY VOLTAGE vs. CHARGING CURRENT

MAX1873 toc01

CHARGING CURRENT (A)

BATTERY VOLTAGE (V)

CSB

+ 0.068Ω

1.0

0.5

2.5

2.0

1.5

4.0

3.5

3.0

4.5

010050 150 200 250

IOUT VOLTAGE

vs. CSB-BATT VOLTAGE

MAX1873 toc02

CSB-BATT VOLTAGE (mV)

IOUT VOLTAGE (V)

4.180

4.190

4.185

4.200

4.195

4.205

4.210

RECENT VOLTAGE VS. TEMPERATURE

MAX1873 toc04

TEMPERATURE (

REFERENCE VOLTAGE (V)

-50 0 25-25 50 75 100

MAX1873T

15.5

16.0

17.0

16.5

17.5

18.0

021345

MAX1873T (4-CELL)

BATTERY REGULATION VOLTAGE

vs. VADJ VOLTAGE

MAX1873 toc03

VADJ VOLTAGE (V)

BATTERY REGULATION VOLTAGE (V)

4.180

4.195

4.190

4.185

4.200

4.205

4.210

0 0.40.30.1 0.2 0.5 0.6 0.7 0.8 0.9 1.0

RECENT VOLTAGE

VS. REFERENCE CURRENT

MAX1873 toc05

REFERENCE VOLTAGE (mA)

REFERENCE VOLTAGE (V)

MAX1873T

100

81612 20 24 28

MAX1873R (2-CELL)

EFFICIENCY vs. INPUT VOLTAGE

MAX1873 toc06

INPUT VOLTAGE (V)

EFFICIENCY (%)

BATT

= 7V

CHG

= 3A

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Li+ Charger Controller 1

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