Rainbow-electronics MAX1873 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX1873

Simple Current-Limited Switch-Mode

Li+ Charger Controller

4 _______________________________________________________________________________________

ELECTRICAL 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

= -40°C to +85°C. Typical values are at T

= +25°C,

unless otherwise noted.)

PARAMETER CONDITIONS MIN MAX UNITS

INPUT SUPPLY AND REFERENCE

DCIN Input Voltage Range 628V

6.0V < V

DCIN

< 28V 7 mA

D C IN Qui escent S up p l y C ur r ent

DCIN ≤ BATT 10 µA

DCIN to BATT Undervoltage Threshold CSSP = DCIN, input falling 0.05 0.2 V

DCIN to BATT Undervoltage Threshold CSSP = DCIN, input rising 0.22 0.38 V

VL Output Voltage 6.0V < V

DCIN

< 28V 5.15 5.65 V

VL Output Load Regulation I

= 0 to 3mA 50 mV

REF Output Voltage I

REF

= 21µA (200kΩ load) 4.179 4.221 V

6mV

REF Line Regulation 6.0V < V

DCIN

< 28V

65 ppm/V

REF Load Regulation I

REF

= 0 to 1mA 13 mV

SWITCHING REGULATOR

PWM Oscillator Frequency 270 330 kHz

EXT Driver Source On-Resistance 7 Ω

EXT Driver Sink On-Resistance 4.5 Ω

VH Output Voltage DCIN - VH, 6V < V

DCIN

<28V, I

= 0 to 20mA 4.75 5.75 V

CSSN/CSSP Input Current V

CSSN

CSSP

= 28V, V

DCIN

= 28V 200 µA

CSSN/CSSP Off-State Leakage V

DCIN

= V

SSN

CSSP

= 18V V

BATT

= V

CSB

= 18V 5 µA

ICHG/EN = 0 (charger disabled) 1

BATT, CSB Input Current

ICHG/EN = REF (charger enabled) 500

µA

BATT, CSB Input Current DCIN ≤ BATT (input power removed) 5 µA

2-cell version MAX1873R 10.45 11.55

3-cell version MAX1873S 15.675 17.325

BATT Overvoltage Cutoff Threshold

4-cell version MAX1873T (Note 1) 17.575 19.425

VADJ

= 0 7.898 8.018

VADJ

= V

REF

/2 8.337 8.463

MAX1873R

(2 Li+ cells)

VADJ

= V

REF

(Note 1) 8.775 8.909

VADJ

= 0 11.847 12.027

VADJ

= V

REF

/2 12.505 12.695

MAX1873S

(3 Li+ cells)

VADJ

= V

REF

(Note 1) 13.163 13.363

VADJ

= 0 15.796 16.036

VADJ

= V

REF

/2 16.674 16.926

Battery Regulation Voltage

MAX1873T

(4 Li+ cells)

VADJ

= V

REF

(Note 1) 17.551 17.817

1 2 3 4 5 6 7 8 9 ... 13 14

Li+ Charger Controller 1

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