Rainbow Electronics MAX1708 - Manual (Page 4)

Note 1: Output voltage is specified at 0.5A switch current I SW , which is equivalent to approximately 0.5A ✕ (V IN / 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 SW ✕ (V IN / 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)
(V OUT = V CLK = +3.6V, ONA = ONB = FB = GND, T A = -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 ✕ V OUT
Input Low Level (Note 7)
CLK, 2.7V < V OUT < 5.5V 0.2 ✕ V OUT
V
ONA, ONB, 3.3/5, 1.2V < V OUT < 5.5V 0.8 ✕ V OUT
Input High Level
CLK, 2.7V < V
OUT
< 5.5V 0.8 ✕ V
OUT
V
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