Rainbow-electronics MAX1708 Uživatelský manuál stáhnout pdf (Strana 4)

Note 1: Output voltage is specified at 0.5A switch current I

, which is equivalent to approximately 0.5A

/ V

OUT

) of load cur-

rent.

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

external feedback mode. Note that the equivalent load current is approximately I

/ V

OUT

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 MAX1708 is bootstrapped and will operate down to a 0.7V input once started.

Note 6: Supply current is measured from the output voltage (+3.3V) to the OUT pin. 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.

MAX1708

High-Frequency, High-Power, Low-Noise,

Step-Up DC-DC Converter

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

OUT

= V

CLK

= +3.6V, ONA = ONB = FB = GND, T

= -40°C to +85°C, unless otherwise noted.) (Note 9)

PARAMETER CONDITIONS MIN MAX UNITS

ONA, ONB, 3.3/5, 1.2V < V

OUT

< 5.5V 0.2

OUT

Input Low Level (Note 7)

CLK, 2.7V < V

OUT

< 5.5V 0.2

OUT

ONA, ONB, 3.3/5, 1.2V < V

OUT

< 5.5V 0.8

OUT

Input High Level

CLK, 2.7V < V

OUT

< 5.5V 0.8

OUT

Logic Input Current ONA, ONB, CLK, 3.3/5 = 0, 5.5V -1 1 µA

Internal Oscillator Frequency 500 700 kHz

Maximum Duty Cycle 80 95 %

External Clock Frequency Range 350 1000 kHz

CLK Pulse Width (Note 8) 100 ns

CLK Rise/Fall Time (Note 8) 50 ns

1 2 3 4 5 6 7 8 9 ... 12 13

Step-Up DC-DC Converter 1

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