Rainbow-electronics MAX1873 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX1873

Simple Current-Limited Switch-Mode

Li+ Charger Controller

_______________________________________________________________________________________ 5

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

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

= +25°C,

unless otherwise noted.)

PARAMETER CONDITIONS MIN MAX UNITS

MAX1873R 4.8 5.2

MAX1873S 7.2 7.8

BATT Undervoltage Threshold

For I

CHG

/20 trickle

charge

MAX1873T 9.6 10.4

CURRENT SENSE

ICHG/EN

= V

REF

190 210 mV

CSB to BATT Battery Current-Sense

Voltage

ICHG/EN

= V

REF

/4 40 60 mV

CSB to BATT Current-Sense Voltage

when V

BATT

< 2.5V per Cell

515mV

CSSP to CSSN Current-Sense Voltage 6V < V

CSSP

< 28V 90 110 mV

CONTROL INPUTS/OUTPUTS

ICHG/EN Input Threshold Includes 50mV of hysteresis 500 700 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 4.4

25% scale

CSB

- V

BATT

= 50mV,

0 < I

OUT

< 500µA

0.9 1.1

Trickle charge V

CSB

- V

BATT

= 10mV 75 325

IOUT Voltage

No charge

current

CSB

- V

BATT

= 0,

IOUT

= sinking 20µA

40 90

Note 1: While it may appear possible to set the Battery Regulation Voltage higher than the Battery Overvoltage Cutoff Threshold, this

cannot happen because both parameters are derived from the same reference and track each other.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

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Li+ Charger Controller 1

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