MAX668EUB datasheet(5/18 Pages) MAXIM

Part #	MAX668EUB

Description	1.8V to 28V Input, PWM Step-Up Controllers in μMAX

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Manufacturer	MAXIM [Maxim Integrated Products]

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1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

_______________________________________________________________________________________

5

50

60

65

70

75

80

85

90

95

1

10

100

1000

10,000

EFFICIENCY vs. LOAD CURRENT

(VOUT = 5V)

LOAD CURRENT (mA)

55

VIN = 3.3V

VIN = 3.6V

VIN = 2V

VIN = 2.7V

BOOTSTRAPPED

FIGURE 3

R4 = 200k

Ω

70

1

10,000

1000

10

100

MAX668 EFFICIENCY vs.

LOAD CURRENT (VOUT = 12V)

85

75

95

80

90

LOAD CURRENT (mA)

VIN = 5V

NON-BOOTSTRAPPED

FIGURE 4

R4 = 200k

Ω

MAX668 EFFICIENCY vs.

LOAD CURRENT (VOUT = 24V)

LOAD CURRENT (mA)

70

1

10,000

1000

10

100

85

75

95

80

90

VIN = 8V

VIN = 5V

VIN = 12V

NON-BOOTSTRAPPED

FIGURE 4

R4 = 200k

Ω

0

1.5

1.0

0.5

2.0

2.5

3.0

0

400

300

100 200

500 600 700 800 900 1000

MAX669 MINIMUM START-UP VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

VOUT = 5V

VOUT = 12V

BOOTSTRAPPED

FIGURE 2

0

0.5

1.5

2.0

2.5

3.0

3.5

010

5

15202530

SHUTDOWN CURRENT vs.

SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

1.0

CURRENT INTO VCC PIN

MAX668

MAX669

0

400

200

800

600

1000

1200

010

15

5

202530

SUPPLY CURRENT vs.

SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

MAX669

MAX668

CURRENT INTO VCC PIN

ROSC = 500kΩ

0

500

1000

2000

2500

3000

3500

4000

04

26

8

10

12

NO-LOAD SUPPLY CURRENT vs.

SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

1500

VOUT = 12V

BOOTSTRAPPED

FIGURE 2

R4 = 200k

Ω

150

190

210

170

250

230

270

290

-40

-20

0

20

40

60

80

100

SUPPLY CURRENT vs.

TEMPERATURE

TEMPERATURE (

°C)

ROSC = 100kΩ

ROSC = 200kΩ

ROSC = 500kΩ

0.1

1

10

20

LDO DROPOUT VOLTAGE vs.

LDO CURRENT

LDO CURRENT (mA)

300

0

50

100

150

200

250

VIN = 3V

VIN = 4.5V

Typical Operating Characteristics

(Circuits of Figures 2, 3, 4, and 5; TA = +25°C; unless otherwise noted.)

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