MAX8845Z datasheet(5/18 Pages) MAXIM

Part #	MAX8845Z

Description	28V Linear Li Battery Chargers with Battery Detection and Overvoltage Protected Output

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Manufacturer	MAXIM [Maxim Integrated Products]

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28V Linear Li+ Battery Chargers with Battery

Detection and Overvoltage Protected Output

_______________________________________________________________________________________

5

Typical Operating Characteristics (continued)

(VIN = 5V, VBATT = 4V, RPOK = RCHG = 200kΩ to 5V, EN = unconnected, RSETI = 2.8kΩ to GND, RMIN = 1.74kΩ to GND, RDETBAT =

4.7k

Ω to GND, CBATT = 2.2µF, TA = +25°C, unless otherwise noted.)

-1.0

-0.4

-0.6

-0.8

-0.2

0

0.2

0.4

0.6

0.8

1.0

-40

10

-15

35

60

85

BATTERY REGULATION ACCURACY

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (

°C)

IBATT = 0

FAST-CHARGE CURRENT

vs. RSETI

RSETI (k

Ω)

1000

100

10

100

1000

1

10,000

TOP-OFF CURRENT THRESHOLD

vs. 1/RMIN (k

Ω)

1/RMIN (k

Ω)

100

150

200

250

300

350

400

450

500

550

600

50

0.4

0.6

0.8

2.0

1.0

0.5

0.7

0.9

1.1

1.3

1.5

1.7

1.9

1.2

1.4

1.6

1.8

TOP-OFF CURRENT RISING

TOP-OFF CURRENT FALLING

0

200

100

400

300

600

500

700

-40

0

20

-20

40

60

80

100

CHARGE CURRENT

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (

°C)

VBATT = 4V

VBATT = 3.2V

RSETI = 2.8k

Ω

4

μs/div

AUTOBOOT ENABLED BY ABI SIGNAL

(MAX8845Z)

VABI

VIN

5V/div

MAX8845Z/Y toc14

VBATT

VABO

0

20

μs/div

AUTOBOOT ENABLED BY INPUT VOLTAGE

(MAX8845Z)

VABI

VIN

5V/div

MAX8845Z/Y toc15

VBATT

VABO

0

4

μs/div

AUTOBOOT ENABLED BY ABI SIGNAL

(MAX8845Y)

VABI

VIN

5V/div

MAX8845Z/Y toc16

VBATT

VABO

0

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