MAX8568A Просмотр технического описания (PDF) - Maxim Integrated

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MAX8568A

Complete Backup-Management ICs for Lithium and NiMH Batteries

Maxim Integrated 

Complete Backup-Management ICs

for Lithium and NiMH Batteries

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 7, VIN = VINOK = 3.6V, VBK = 1.4V, VNI/LI = VBKSU = 3.3V, VBKV = GND = PGND = 0V, VSTRTV = VTERMV = 1.2V,

R5 = 250kΩ, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)

PARAMETER

LX Current Limit (ILIM)

n-Channel Switch Maximum On-Time

p-Channel Zero-Channel Crossing Current

LOW-DROPOUT REGULATOR

BKSU Input Voltage Range

LDO Output-Voltage Accuracy

CONDITIONS

MIN

400

3.5

5

VBKSU = 3.3V

MAX8568A

MAX8568B

2.7

2.375

1.71

MAX

600

6.5

35

5.0

2.625

1.89

Note 1: All units are 100% production tested at TA = +25°C. Limits over the operating range are guaranteed by design.

Note 2: All backup step-up converter specifications are with VIN = VINOK = 0V, unless otherwise noted.

Note 3: Specifications to -40°C are guaranteed by design and not production tested.

UNITS

mA

µs

mA

V

V

Typical Operating Characteristics

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

NiMH CHARGE CURRENT

vs. BACKUP BATTERY VOLTAGE

12

10

8

6

FALLING

RISING

4

2

VIN = 3.9V

0

0

0.4 0.8 1.2 1.6 2.0

BACKUP BATTERY VOLTAGE (V)

LITHIUM CHARGE CURRENT

vs. BACKUP BATTERY VOLTAGE

14

12

VIN = 5V, VBK(LIMAX) = 4.2V

10

8

VIN = 3.9V

6

VBK(LIMAX) = 3.4V

4

2

0

0 0.6 1.2 1.8 2.4 3.0 3.6 4.2

BACKUP BATTERY VOLTAGE (V)

Li-ION TERMINATION VOLTAGE

vs. TEMPERATURE

4.180

4.179

4.178

4.177

4.176

4.175

4.174

4.173

4.172

4.171

4.170

-40 -15

10

35

60

85

TEMPERATURE (°C)

_______________________________________________________________________________________ 5

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