MAX1708 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

MAX1708

High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter

Maxim Integrated 

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

Step-Up DC-DC Converter

ELECTRICAL CHARACTERISTICS (continued)

(VOUT = VCLK = +3.6V, ONA = ONB = FB = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 9)

PARAMETER

Input Low Level (Note 7)

Input High Level

Logic Input Current

Internal Oscillator Frequency

Maximum Duty Cycle

External Clock Frequency Range

CLK Pulse Width

CLK Rise/Fall Time

CONDITIONS

ONA, ONB, 3.3/5, 1.2V < VOUT < 5.5V

CLK, 2.7V < VOUT < 5.5V

ONA, ONB, 3.3/5, 1.2V < VOUT < 5.5V

CLK, 2.7V < VOUT < 5.5V

ONA, ONB, CLK, 3.3/5 = 0, 5.5V

(Note 8)

(Note 8)

MIN

0.8 ✕ VOUT

0.8 ✕ VOUT

-1

500

80

350

100

MAX

0.2 ✕ VOUT

0.2 ✕ VOUT

UNITS

V

V

1

µA

700

kHz

95

%

1000 kHz

ns

50

ns

Note 1: Output voltage is specified at 0.5A switch current ISW, which is equivalent to approximately 0.5A ✕ (VIN / VOUT) 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 ISW ✕ (VIN / VOUT).

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.

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