Rainbow-electronics MAX1709 Manual de usuario descargar pdf (Pagina 3)

MAX1709

4A, Low-Noise, High-Frequency,

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

< 5.5

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 1 µA

Internal Oscillator Frequency 520 600 680 kHz

Maximum Duty Cycle 82 90 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 TYP MAX UNITS

< 0.1V, V

= +2.4V 3.3/5 = GND, I

= 1A 3.24 3.45

Output Voltage

(Note 1) 3.3/5 = OUT, I

= 1A 4.9 5.2

FB Regulation Voltage I

= 1A 1.21 1.27 V

FB Input Current V

= +1.5V 200 nA

Load Regulation Measured between 1A < I

< 5A (Note 2) -0.45 %/A

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

OUT Leakage Current in

Shutdown

ONB

= 3.6V 5 µA

OUT Supply Current V

= 1.5V (Note 6) 400 µA

N-Channel Switch

On-Resistance

40 mΩ

SS/LIM = unconnected 7.5 15

N-Channel Current Limit

SS/LIM = 150kΩ to GND 3.5 7

Reference Voltage I

REF

= 0 1.24 1.28 V

1 2 3 4 5 6 7 8 ... 11 12

Step-Up DC-DC Converter 1

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Rainbow-electronics MAX1709 Manual de usuario Pagina 3

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