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Datasheet MAX1647 - Chemistry-Independent Battery Chargers - Maxim Integrated Products

Chemistry-Independent Battery ChargersMAX1647/MAX1648

__________________________________________Typical Operating Characteristics

(Circuit of Figure 3, TA = +25°C, unless otherwise noted.)

MAX1647

BATT LOAD TRANSIENT

MAX1647/48-01

VCCI2.4V VCCV200mV/div12V

VBATT1V/div

12V

MAX1647

BATT LOAD TRANSIENT

MAX1647/48-02

VCCV2.3V VCCI100mV/div

VBATT5V/div

1ms/div

ChargingVoltage( ) = 0x2EE0 = 12000mV ChargingCurrent( ) = 0xFFFF = MAX VALUE ACDCIN = 18.0V, SEL = OPEN, R1 = 0.1 R2 = 10k , C1 = 68µF, C2 = 0.1µF, C3 = 47nF L1 = 22µH, VREF = 4.096V

2ms/div

ChargingVoltage( ) = 0x2EE0 = 12000mV ChargingCurrent( ) = 0x03E8 = 1000mA ACDCIN = 18.0V, SEL = OPEN, C1 = 68µF, C2 = 0.1µF, C3 = 47nF, R1 = 0.1 R2 = 10k , L1 = 22µH, VREF = 4.096V

VL VOLTAGE vs. LOAD CURRENT

5.55.0

4.5VL (V)

3.863.843.82VREF (V)3.803.783.763.74

10

20

30

40

50

LOAD CURRENT (mA)

3.723.70

INTERNAL REFERENCE VOLTAGE

MAX1647/48-04

4.0

3.5

0.51.01.52.0

LOAD CURRENT (mA)

INPUT AND OUTPUT POWER

DROP IN BATT OUTPUT VOLTAGE (%)

3530POWER (W)

2520151050

500

2000

CURRENT INTO BATT (mA)

1000

1500

2500

MAX1647

OUTPUT V-I CHARACTERISTIC

OUTPUT VOLTAGE ERROR

400.001

0.010.1

0.8OUTPUT VOLTAGE ERROR (%)

0.6

0.40.20

-0.2-0.4

1

10

500

1000

1500

2000

2500

100

LOAD CURRENT (mA)

4500850012,50016,500

PROGRAMMED VOLTAGE CODE IN DECIMAL

6_______________________________________________________________________________________