Rainbow-electronics MAX8724 Instrukcja Użytkownika Pobierz pdf (Strona 8)

MAX1908/MAX8724

Low-Cost Multichemistry Battery Chargers

8 _______________________________________________________________________________________

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CELLS Input Float Voltage CELLS = float

REFIN

/ 2) -

0.2V

( V

R E F IN

/ 2) +

0.2V

CELLS Input High Voltage

REFIN

- 0.4V

ACOK AND SHDN

ACOK Input Voltage Range 0 28 V

ACOK Sink Current V

A COK

= 0.4V, V

ACIN

= 3V 1 mA

SHDN Input Voltage Range 0

LDO

SHDN Threshold V

S HDN

falling 22 25

% of

REFIN

Note 1: If both ICTL and VCTL use default mode (connected to LDO), REFIN is not used and can be connected to LDO.

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

LOAD-TRANSIENT RESPONSE

(BATTERY INSERTION AND REMOVAL)

MAX1908 toc01

1ms/div

BATT

2A/div

BATT

5V/div

CCI 500mV/div

CCV 500mV/div

ICTL = LDO

VCTL = LDO

CCV

CCI

LOAD-TRANSIENT RESPONSE

(STEP IN-LOAD CURRENT)

MAX1908 toc02

1ms/div

V_BATT

2V/div

V_CCI

500mV/div

V_CCS

500mV/div

16.8V

LOAD

CURRENT

5A/div

ADAPTER

CURRENT

5A/div

ICTL = LDO

CHARGING CURRENT = 3A

V_BATT = 16.8V

LOAD STEP = 0 TO 4A

I_SOURCE LIMIT = 5A

CCI

CCS

CCI

CCS

V_BATT

2V/div

CHARGE

CURRENT

2A/div

LOAD

CURRENT

5A/div

ADAPTER

CURRENT

5A/div

LOAD-TRANSIENT RESPONSE

(STEP IN-LOAD CURRENT)

MAX1908 toc03

1ms/div

ICTL = LDO

CHARGING CURRENT = 3A

VBATT = 16.8V

LOAD STEP = 0 TO 4A

I_SOURCE LIMIT = 5A

Typical Operating Characteristics

(Circuit of Figure 1, V

DCIN

= 20V, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 26 27

MAX1908/MAX8724 1
Package Information 27

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