MAX8568BETE datasheet(6/17 Pages) MAXIM

Part #	MAX8568BETE

Description	Complete Backup-Management ICs for Lithium and NiMH Batteries

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Manufacturer	MAXIM [Maxim Integrated Products]

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6 / 17 page

Complete Backup-Management ICs

for Lithium and NiMH Batteries

6

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 7, VIN = 3.6V, VBK = 1.4V, VNI/LI = VBKSU = 3.3V, TA = +25°C, unless otherwise noted.)

CHARGE CURRENT vs. TEMPERATURE

9.2

9.4

9.6

9.8

10.0

10.2

10.4

10.6

10.8

11.0

9.0

TEMPERATURE (

°C)

60

35

10

-15

-40

85

VBK = 3.6V, VIN = 4.2V, R5 = 127k

Ω

VBK = 3.6V, VIN = 4V, R5 = 127k

Ω

VBK = 1.4V, VIN = 4V, R5 = 169k

Ω

CHARGE PROFILE FOR NiMH

MAX8568 toc05

CHARGE TIME (HOURS)

8

6

4

2

1.32

1.34

1.36

1.38

1.40

1.42

1.30

1

2

3

4

5

6

0

010

VARTA V20HR

BK VOLTAGE

CHARGE CURRENT

VBK(NILO) = 1.2V

VBK(NIHI) = 1.4V

VBK(NIMAX) = 1.8V

R5 = 953k

Ω

CHARGE PROFILE FOR LiVeO5

MAX8568 toc06

CHARGE TIME (HOURS)

8

246

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

2.0

1

2

3

4

5

6

7

8

0

010

PANASONIC VL2330

VBK(LIMAX) = 3.4V

R5 = 432k

Ω

BK VOLTAGE

CHARGE CURRENT

3.3V STEP-UP EFFICIENCY

vs. LOAD CURRENT

LOAD CURRENT (mA)

10

1

0.1

10

20

30

40

50

60

70

80

90

100

0

0.01

100

L1 = MURATA LQH32CN100K

VBK = 2.9V

VBK = 1.4V

2.5V STEP-UP EFFICIENCY

vs. LOAD CURRENT

LOAD CURRENT (mA)

10

1

0.1

10

20

30

40

50

60

70

80

90

100

0

0.01

100

L1 = MURATA LQH32CN100K

VBK = 2.9V

VBK = 1.4V

BKSU OUTPUT VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

50

40

30

20

10

3.22

3.24

3.26

3.28

3.30

3.32

3.34

3.20

060

TA = -40

°C

TA = +25

°C

TA = +85

°C

BK SUPPLY CURRENT

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

4

3

2

10

20

30

40

50

60

70

0

15

BOOST AND LDO ACTIVE

VBKSU = 3.3V

LIGHT-LOAD SWITCHING WAVEFORMS

MAX8568 toc11

50

µs/div

ILX

VLX

200mA/div

0

20mV/div

AC-COUPLED

2V/div

0

VBKSU

LOAD = 1mA

C3 = 22

µF

HEAVY-LOAD SWITCHING WAVEFORMS

MAX8568 toc12

5

µs/div

ILX

VLX

200mA/div

0

20mV/div

AC-COUPLED

2V/div

0

VBKSU

LOAD = 50mA

C3 = 22

µF

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