Rainbow-electronics MAX8724 Uživatelský manuál stáhnout pdf (Strana 3)

MAX1908/MAX8724

Low-Cost Multichemistry Battery Chargers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

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

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DCIN

= 5V, V

REFIN

= 3V -1 +1

REFIN Input Bias Current

REFIN

= 5V -1 +1

µA

ICHG Transconductance

ICHG

CSIP

- V

CSIN

= 45mV 2.7 3 3.3

µA/mV

CSIP

- V

CSIN

= 75mV -6 +6

CSIP

- V

CSIN

= 45mV -5 +5 ICHG Accuracy

CSIP

- V

CSIN

= 5mV -40

+40

ICHG Output Current V

CSIP

- V

CSIN

= 150mV, V

ICHG

= 0

350

µA

ICHG Output Voltage V

CSIP

- V

CSIN

= 150mV, ICHG

= float 3.5 V

INPUT CURRENT REGULATION

CSSP-to-CSSN Full-Scale

Current-Sense Voltage

72 75 78 mV

CLS

= V

REF

-4 +4

Input Current-Limit Accuracy

CLS

= V

REF

/ 2

-7.5

+7.5

CSSP, CSSN Input Voltage

Range

8 28 V

DCIN

= 0 0.1 1

CSSP, CSSN Input Current

CSSP

= V

CSSN

= V

DCIN

> 8V

350

600

µA

CLS Input Range 1.6

REF

CLS Input Bias Current V

CLS

= 2V -1 +1 µA

IINP Transconductance G

IINP

CSSP

- V

CSSN

= 75mV 2.7 3 3.3

µA/mV

CSSP

- V

CSSN

= 75mV -5 +5

IINP Accuracy

CSSP

- V

CSSN

= 37.5mV

-7.5

+7.5

IINP Output Current V

CSSP

- V

CSSN

= 150mV, V

IINP

= 0

350

µA

IINP Output Voltage V

CSSP

- V

CSSN

= 150mV,V

IINP

= float 3.5 V

SUPPLY AND LDO REGULATOR

DCIN Input Voltage Range V

DCIN

8 28 V

DCIN

falling 7 7.4

DCIN Undervoltage-Lockout Trip

Point

DCIN

rising 7.5

7.85

DCIN Quiescent Current I

DCIN

8.0V < V

DCIN

< 28V 3.2 6 mA

BATT

= 19V, V

DCIN

= 0 1

BATT Input Current I

BATT

= 2V to 19V, V

DCIN

= 19.3V

200

500

µA

LDO Output Voltage 8V < V

DCIN

< 28V, no load

5.25

5.4

5.55

LDO Load Regulation 0 < I

LDO

< 10mA 34 100 mV

LDO Undervoltage-Lockout Trip

Point

DCIN

= 8V

3.20

5.15

REFERENCE

REF Output Voltage 0 < I

REF

< 500µA

4.072 4.096 4.120

1 2 3 4 5 6 7 8 ... 26 27

MAX1908/MAX8724 1
Package Information 27

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