MAX858CUA datasheet(3/12 Pages) MAXIM

Part #	MAX858CUA

Description	3.3V/5V or Adjustable-Output, Step-Up DC-DC Converters

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Manufacturer	MAXIM [Maxim Integrated Products]

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3.3V/5V or Adjustable-Output,

Step-Up DC-DC Converters

_______________________________________________________________________________________

3

100

20

10

0

0.01

0.001

0.1

10

1

100

1000

MAX858/MAX859

EFFICIENCY vs. OUTPUT CURRENT

VOUT = 3.3V

40

30

50

LOAD CURRENT (mA)

60

70

80

90

VIN = 2.0V

VIN = 2.5V

VIN = 1.5V

100

20

10

0

0.01

0.001

0.1

10

1

100

1000

MAX858/MAX859

EFFICIENCY vs. OUTPUT CURRENT

VOUT = 5V

40

30

50

LOAD CURRENT (mA)

60

70

80

90

VIN = 2.5V

VIN = 3.3V

VIN = 1.5V

100

20

10

0

0.01

0.001

0.1

10

1

100

1000

MAX856/MAX857

EFFICIENCY vs. OUTPUT CURRENT

VOUT = 5V

40

30

50

LOAD CURRENT (mA)

60

70

80

90

VIN = 2.0V

VIN = 3.3V

VIN = 1.5V

100

20

10

0

0.01

0.001

0.1

10

1

100

1000

MAX856/MAX857

EFFICIENCY vs. OUTPUT CURRENT

VOUT = 3.3V

40

30

50

LOAD CURRENT (mA)

60

70

80

90

VIN = 2.0V

VIN = 2.5V

VIN = 1.5V

__________________________________________Typical Operating Characteristics

(Circuits of Figure 2, TA = +25°C, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(Circuits of Figure 2, VIN = 2.5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

Note 2: Supply current from the 3.3V output is measured with an ammeter between the 3.3V output and OUT pin. This current

correlates directly with actual battery supply current, but is reduced in value according to the step-up ratio and efficiency.

VOUT = 3.47V to keep the internal switch open when measuring the current into the device.

Note 3: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.

–

S

—

H

—

D

—

N

–

, 3/

–

5

–

Input Voltage Low

0.4

V

S

—

H

—

D

—

N

–

, 3/

–

5

–

Input Voltage High

1.6

V

S

—

H

—

D

—

N

–

, 3/

–

5

–

, FB, LBI Input Current

LBI = 1.5V, FB = 1.5V,

–

S

—

H

—

D

—

N

–

= 0V or 3V, 3/

–

5

–

= 0V or 3V

±100

nA

FB Voltage

MAX857/MAX859

1.22

1.25

1.28

V

Output Voltage Range

MAX857/MAX859, ILOAD = 0mA (Note 3)

2.7

6.0

V

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