0.8A, Low-Noise, 1MHz,

Step-Up DC-DC Converter

4

_______________________________________________________________________________________

Note 1: Operating voltage—since the regulator is bootstrapped to the output, once started, the MAX1760 operates down

to 0.7V input.

Note 2: Startup is tested with the circuit shown in Figure 6.

Note 3: Defines maximum step-up ratio.

Note 4: The regulator is in startup mode until this voltage is reached. Do not apply full load current until the output exceeds 2.3V.

Note 5: Supply current into the OUT pin. This current correlates directly to the actual battery-supply current, but is reduced in

value according to the step-up ratio and efficiency.

Note 6: ON (MAX1760) and ON (MAX1760H) have a hysteresis of approximately 0.15

Note 7: Specifications to -40°C are guaranteed by design and not production tested.

100

0

0.0001

0.001

0.01

0.1

1

EFFICIENCY vs. OUTPUT CURRENT

20

OUTPUT CURRENT (A)

40

70

90

60

80

10

30

50

A

B

C

= AUTO MODE

= FPWM MODE

100

0

0.0001

0.001

0.01

0.1

1

EFFICIENCY vs. OUTPUT CURRENT

20

OUTPUT CURRENT (A)

40

70

90

60

80

10

30

50

= AUTO MODE

= FPWM MODE

A

B

C

MAXIMUM OUTPUT CURRENT

vs. INPUT VOLTAGE

0.1

1.0

0.5

1.5

2.0

2.5

3.0

3.5

4.0

0.3

0.2

0.5

0.4

0.8

0.7

0.6

0.9

INPUT VOLTAGE (V)

ELECTRICAL CHARACTERISTICS (continued)

Typical Operating Characteristics

PARAMETER

CONDITIONS

MIN

MAX

UNITS

N-Channel Current Limit

1.0

1.6

A

REFERENCE

Reference Output Voltage

1.230

1.270

V

LOGIC INPUTS

CLK/SEL Input Low Level

2.5V

0.2 x

V

CLK/SEL Input High Level

2.5V

0.8 x

V

1.1V

0.2

ON, ON Input Low Level (Note 6)

1.8V

0.4

V

1.1V

ON, ON Input High Level (Note 6)

1.8V

1.6

V

Input Leakage Current

CLK/SEL, ON, ON

1

µA