MAX712CSE 参数 Datasheet PDF下载

NiCd/NiMH Battery

Fast-Charge Controllers

ELECTRICAL CHARACTERISTICS (continued)

(I

V

+ = 10mA, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Refer to

Typical Operating Circuit.

All measurements are with respect to

BATT-, not GND.)

PARAMETER

FASTCHG

Low Current

FASTCHG

High Current

A/D Input Range (Note 4)

CONDITIONS

V

FASTCHG

= 0.4V

V

FASTCHG

= 10V

Battery voltage ÷ number of cells programmed

1.4

MIN

2

10

1.9

TYP

MAX

UNITS

mA

µA

V

MAX712/MAX713

Note 1:

The MAX712/MAX713 are powered from the V+ pin. Since V+ shunt regulates to +5V, R1 must be small enough to allow at

least 5mA of current into the V+ pin.

Note 2:

Offset voltage of THI and TLO comparators referred to TEMP.

Note 3:

t

A

is the A/D sampling interval (Table 3).

Note 4:

This specification can be violated when attempting to charge more or fewer cells than the number programmed. To ensure

proper voltage-slope fast-charge termination, the (maximum battery voltage) ÷ (number of cells programmed) must fall

within the A/D input range.

__________________________________________Typical Operating Characteristics

(T

A

= +25°C, unless otherwise noted.)

CURRENT-SENSE AMPLIFIER

FREQUENCY RESPONSE (with 15pF)

MAX712/13 LOG1

CURRENT-SENSE AMPLIFIER

FREQUENCY RESPONSE (with 10nF)

C2 = 10nF

FASTCHG = 0V

0

PHASE (DEGREES)

GAIN (dB)

10

A

V

0

Φ

-10

-80

-40

MAX712/13 LOG2

20

C2 = 15pF

FASTCHG = 0V

10

GAIN (dB)

A

V

0

Φ

40

20

40

0

PHASE (DEGREES)

30

25

20

15

10

5

0

0

10

20

30

40

50

60

BATTERY TEMPERATURE(°C)

BATTERY THERMISTOR RESISTANCE (kΩ)

35

-40

BATT-

-10

CC

CURRENT-

SENSE

AMP

BATT-

+

+

-80

V

IN

-

V

OUT

-

GND

-20

1k

10k

100k

FREQUENCY (Hz)

1M

10M

-120

-20

10

100

1k

10k

FREQUENCY (Hz)

-120

CURRENT ERROR-AMPLIFIER

TRANSCONDUCTANCE

MAX712/13 LOG3

SHUNT-REGULATOR VOLTAGE

vs. CURRENT

5.6

5.4

DRV NOT SINKING CURRENT

MAX712/13 LOG4

ALPHA THERMISTOR PART No. 13A1002

STEINHART-HART INTERPOLATION

1.6

1.4

TEMP PIN VOLTAGE (V)

60

1.2

1.0

0.8

0.6

0.4

0.2

100

FASTCHG = 0V, V+ = 5V

DRV PIN SINK CURRENT(mA)

5.8

10

V+ VOLTAGE (V)

5.2

5.0

4.8

4.6

4.4

4.2

DRV SINKING CURRENT

1

0.1

1.95

4.0

1.97

1.99

2.01

2.03

2.05

0

10

20

30

40

50

VOLTAGE ON CC PIN (V)

CURRENT INTO V+ PIN (mA)

_______________________________________________________________________________________

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