Rainbow-electronics MAX1708 Manual de usuario descargar pdf (Pagina 3)

MAX1708

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

Step-Up DC-DC Converter

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

OUT

= V

CLK

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

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

ELECTRICAL CHARACTERISTICS

OUT

= V

CLK

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

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

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

OUT

<5.5V 0.8

OUT

Input High Level

CLK, 2.7 V< 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 520 600 680 kHz

Maximum Duty Cycle 82 88 94 %

External Clock Frequency

Range

350 1000 kHz

CLK Pulse Width (Note 8) 100 ns

CLK Rise/Fall Time (Note 8) 50 ns

PARAMETER CONDITIONS MIN MAX UNITS

3.3/5 = GND, I

= 0.5A 3.24 3.45

Output Voltage

< 0.1V, V

= +2.4V

(Note 1)

3.3/5 = OUT, I

= 0.5A 4.90 5.22

FB Regulation Voltage I

= 0.5A 1.20 1.28 V

FB Input Current (V

= +1.5V 200 nA

Load Regulation Measured between 0.5A < I

< 1.5A (Note 2) -0.60 %/A

Soft-Start Pin Current SS/LIM = 1V 3.2 5.2 µA

OUT Leakage Current in

Shutdown

ONB

= 3.6V 2 µA

OUT Supply Current V

= 1.5V (Note 6) 300 µA

N-Channel Switch

On-Resistance

80 mΩ

SS/LIM = open 4.5 7.5

N-Channel Current Limit

SS/LIM = 150kΩ to GND 1.8 4.0

Reference Voltage I

REF

= 0 1.24 1.28 V

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

Step-Up DC-DC Converter 1

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Rainbow-electronics MAX1708 Manual de usuario Pagina 3

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