Rainbow-electronics MAX669 Manual do Utilizador descarregar pdf (Página 5)

MAX668/MAX669

1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

_______________________________________________________________________________________

1 10 100 1000 10,000

EFFICIENCY vs. LOAD CURRENT

OUT

= 5V)

MAX668 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

= 3.3V

= 3.6V

= 2V

= 2.7V

BOOTSTRAPPED

FIGURE 3

R4 = 200kΩ

1 10,000100010 100

MAX668 EFFICIENCY vs.

LOAD CURRENT (V

OUT

= 12V)

MAX668 toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

= 5V

NON-BOOTSTRAPPED

FIGURE 4

R4 = 200kΩ

MAX668 EFFICIENCY vs.

LOAD CURRENT (V

OUT

= 24V)

MAX668 toc03

LOAD CURRENT (mA)

EFFICIENCY (%)

1 10,000100010 100

= 8V

= 5V

= 12V

NON-BOOTSTRAPPED

FIGURE 4

R4 = 200kΩ

1.5

1.0

0.5

2.0

2.5

3.0

0 400300100 200 500 600 700 800 900 1000

MAX669 MINIMUM START-UP VOLTAGE

vs. LOAD CURRENT

MAX668 toc04

LOAD CURRENT (mA)

MINIMUM START-UP VOLTAGE (V)

OUT

= 5V

OUT

= 12V

BOOTSTRAPPED

FIGURE 2

0.5

1.5

2.0

2.5

3.0

3.5

0105 15202530

SHUTDOWN CURRENT vs.

SUPPLY VOLTAGE

MAX668 toc07

SUPPLY VOLTAGE (V)

SHUTDOWN CURRENT (µA)

1.0

CURRENT INTO V

MAX668

MAX669

400

200

800

600

1000

1200

010155 202530

SUPPLY CURRENT vs.

SUPPLY VOLTAGE

MAX668 toc05

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

MAX669

MAX668

CURRENT INTO V

OSC

= 500kΩ

500

1000

2000

2500

3000

3500

4000

042681012

NO-LOAD SUPPLY CURRENT vs.

SUPPLY VOLTAGE

MAX668 toc06

SUPPLY VOLTAGE (V)

NO-LOAD SUPPLY CURRENT (µA)

1500

OUT

= 12V

BOOTSTRAPPED

FIGURE 2

R4 = 200kΩ

150

190

210

170

250

230

270

290

-40 -20 0 20 40 60 80 100

SUPPLY CURRENT vs.

TEMPERATURE

MAX668 toc08

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

OSC

= 100kΩ

OSC

= 200kΩ

OSC

= 500kΩ

0.1 1 10 20

LDO DROPOUT VOLTAGE vs.

LDO CURRENT

MAX668 toc09

LDO CURRENT (mA)

LDO DROPOUT VOLTAGE (mV)

300

100

150

200

250

= 3V

= 4.5V

Typical Operating Characteristics

(Circuits of Figures 2, 3, 4, and 5; T

= +25°C; unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 ... 17 18

MAX668/MAX669 1
Controllers in µMAX 1

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