Rainbow-electronics MAX8724 Manuel d'utilisateur télécharger pdf (Page 6)

MAX1908/MAX8724

Low-Cost Multichemistry Battery Chargers

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

DCIN

= V

CSSP

= V

CSSN

= 18V, V

BATT

= V

CSIP

= V

CSIN

= 12V, V

REFIN

= 3V, V

VCTL

= V

ICTL

= 0.75 x V

REFIN

, CELLS = FLOAT, CLS =

REF, V

BST

- V

= 4.5V, ACIN = GND = PGND = 0, C

LDO

= 1µF, LDO = DLOV, C

REF

= 1µF; CCI, CCS, and CCV are compensated

per Figure 1a; T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

CHARGE VOLTAGE REGULATION

VCTL

= V

REFIN

(2, 3, or 4 cells)

-0.6

+0.6

VCTL

= V

REFIN

/ 20 (2, 3, or 4 cells)

-0.6

+0.6

Battery Regulation Voltage

Accuracy

VCTL

= V

LDO

(2, 3, or 4 cells)

-0.6

+0.6

REFIN Range (Note 1) 2.5 3.6 V

REFIN Undervoltage Lockout V

REFIN

falling

1.92

CHARGE CURRENT REGULATION

CSIP-to-CSIN Full-Scale Current-

Sense Voltage

ICTL

= V

REFIN

70.5

79.5

ICTL

= V

REFIN

-6 +6

ICTL

= V

REFIN

× 0.6

-7.5

+7.5

Charging Current Accuracy

ICTL

= V

LDO

-7.5

+7.5

BATT/CSIP/CSIN Input Voltage

Range

0 19 V

DCIN

= 0 or V

ICTL

= 0 or SHDN = 0 1

CSIP/CSIN Input Current

Charging 650

µA

Cycle-by-Cycle Maximum Current

Limit

MAX

RS2 = 0.015Ω 6.0 7.5 A

ICTL Power-Down Mode

Threshold Voltage

ICTL

rising

REFIN /

100

REFIN /

ICHG Transconductance

ICHG

CSIP

- V

CSIN

= 45mV 2.7 3.3

µA/mV

CSIP

- V

CSIN

= 75mV

-7.5

+7.5

CSIP

- V

CSIN

= 45mV

-7.5

+7.5

ICHG Accuracy

CSIP

- V

CSIN

= 5mV -40

+40

INPUT CURRENT REGULATION

CSSP-to-CSSN Full-Scale

Current-Sense Voltage

71.25

78.75

CLS

= V

REF

-5 +5

Input Current-Limit Accuracy

CLS

= V

REF

/ 2

-7.5

+7.5

CSSP, CSSN Input Voltage

Range

8 28 V

DCIN

= 0 1

CSSP, CSSN Input Current

CSSP

= V

CSSN

= V

DCIN

> 8V 600

µA

CLS Input Range 1.6

REF

IINP Transconductance G

IINP

CSSP

- V

CSSN

= 75mV 2.7 3.3

µA/mV

CSSP

- V

CSSN

= 75mV

-7.5

+7.5

IINP Accuracy

CSSP

- V

CSSN

= 37.5mV

-7.5

+7.5

1 2 3 4 5 6 7 8 9 10 11 ... 26 27

MAX1908/MAX8724 1
Package Information 27

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Rainbow-electronics MAX8724 Manuel d'utilisateur Page 6

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