Rainbow-electronics MAX1706 Manual do Utilizador descarregar pdf (Página 7)

MAX1705/MAX1706

1- to 3-Cell, High-Current, Low-Noise,

Step-Up DC-DC Converters with Linear Regulator

_______________________________________________________________________________________ 7

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2, T

= +25°C, unless otherwise noted.)

100 10k 100k 1M1k 10M

LINEAR-REGULATOR POWER-SUPPLY

REJECTION RATIO vs. FREQUENCY

MAX1705/6 TOC10

FREQUENCY (Hz)

PSRR (dB)

OUT

= 4V TO 5V

LDO

= 3.3V

LDO

= 200mA

C5 = 0.33µF

100

1 10050 200 250150 300

LINEAR-REGULATOR

REGION OF STABLE C6

ESR

vs. LOAD CURRENT

0.1

MAX1705/6 TOC11

LOAD CURRENT (mA)

C6 ESR (Ω)

STABLE REGION

C2 = 22pF (FEED FORWARD)

UNCOMPENSATED

C6 = 22µF

1k 10k 100k 1M 10M

MAX1705

NOISE SPECTRUM AT POUT

OUT

= 4.5V, V

= 1.2V, 200mA LOAD)

MAX1705/6 TOC13

FREQUENCY (Hz)

NOISE (5mV

RMS/

div)

1k 10k 100k 1M 10M

MAX1705

LINEAR-REGULATOR OUTPUT NOISE SPECTRUM

LDO

= 3.3V, V

OUT

= 4.5V, V

= 1.2V, I

LDO

= 200mA)

MAX1705/6 TOC14

FREQUENCY (Hz)

NOISE (50µV/div)

1 2 3 4 5 6 7 8 9 10 11 12 ... 19 20

MAX1705/MAX1706 1

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