Note 2: Load regulation is measured by forcing specified switch current and straight-line calculation of change in output voltage in

Note 3: Until undervoltage lockout is reached, the device remains in startup mode. Do not apply full load until this voltage is

reached.

Note 4: Startup is tested with Figure 1’s circuit. Output current is measured when both the input and output voltages are applied.

Note 5: Minimum operating voltage. The MAX1709 is bootstrapped and will operate down to a 0.7V input once started.

Note 6: Supply current is measured from the OUT pin to the output voltage (+3.3V). This correlates directly with actual input supply

current but is reduced in value according to the step-up ratio and efficiency.

Note 7: ONA and

ONB inputs have approximately 0.15V hysteresis.

Note 8: Guaranteed by design, not production tested.

Note 9: Specifications to -40°C are guaranteed by design, not production tested.

4A, Low-Noise, High-Frequency,

Step-Up DC-DC Converter

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ONA,

0.2

×

V

Input Low Level (Note 7)

0.2

×

ONA,

0.8

×

Input High Level

0.8

×

V

Logic Input Current

ONA,

ONB, CLK, 3.3/5

1

µA

Internal Oscillator Frequency

500

700

kHz

Maximum Duty Cycle

80

95

%

External Clock Frequency

Range

350

1000

kHz

CLK/SEL Pulse Width

(Note 8)

100

ns

CLK/SEL Rise/Fall Time

(Note 8)

50

ns