MAX189 datasheet(4/10 Pages) MAXIM

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1.4MHz SOT23 Current-Mode

Step-Up DC-DC Converter

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Typical Operating Characteristics

(Circuit of Figure 1, VIN = 3.3V, TA = +25°C, unless otherwise noted.)

100

110

100

1000

EFFICIENCY vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

VIN = 3.3V,

VOUT = 5V,

CIRCUIT OF FIGURE 1

100

110

100

1000

EFFICIENCY vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

VIN = 3.3V,

VOUT = 13V,

CIRCUIT OF FIGURE 3

100

110

100

1000

EFFICIENCY vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

VIN = 5V,

VOUT = 13V,

CIRCUIT OF FIGURE 3

2.0

1.5

1.0

0.5

2.5

4.0

3.0

3.5

4.5

5.0

5.5

NO LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

VOUT = 13V,

CIRCUIT OF FIGURE 3

12.90

12.95

13.00

13.05

13.10

OUTPUT VOLTAGE vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

100

150

200

CIRCUIT OF FIGURE 3

TA = -40°C

TA = +85°C

TA = +25°C

LOAD

CURRENT

100mA/div

OUTPUT

VOLTAGE

AC-COUPLED

200mV/div

INDUCTOR

CURRENT

500mA/div

200µs/div

CFF = 100pF, COUT = 0.1µF CERAMIC + 10µF CERAMIC

LOAD TRANSIENT (VOUT = 13V)

LOAD

CURRENT

200mA/div

OUTPUT

VOLTAGE

AC-COUPLED

200mV/div

INDUCTOR

CURRENT

500mA/div

400µs/div

COUT = 0.1µF CERAMIC + 22µF TANTALUM

LOAD TRANSIENT (VOUT = 5V)

SHDN

5V/div

OUTPUT

VOLTAGE

5V/div

INDUCTOR

CURRENT

500mA/div

100µs/div

VIN = 3.3V, COUT = 0.1µF CERAMIC + 3.3µF TANTALUM

CIRCUIT OF FIGURE 3

STARTUP WAVEFORM

WITHOUT SOFT-START

SHDN

5V/div

OUTPUT

VOLTAGE

5V/div

IOUT = 10mA

INDUCTOR

CURRENT

500mA/div

2ms/div

VIN = 3.3V, CSS = 33nF,

COUT = 3.3µF TANTALUM + 0.1µF CERAMIC

CIRCUIT OF FIGURE 3

STARTUP WAVEFORM

WITH SOFT-START

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