Rainbow-electronics MAX744A Manual do Utilizador descarregar pdf (Página 12)

MAX730A/MAX738A/MAX744A

5V, Step-Down,

Current-Mode PWM DC-DC Converters

12 ______________________________________________________________________________________

1.23V

1M

±35%

R1

510k

SS CLAMP

FROM SHDN

MAX730A

MAX738A

MAX744A

Figure 2. Block Diagram of Soft-Start Circuitry

MAX730A

MAX738A

MAX744A

SHDN

V+

GND REF

C6

0.01µF

OUT

D1

1N5817

L1*

OUTPUT

+5V

C5

330pF

C2

1µF

R1

510k

C1

0.1µF

*SEE TABLE 2 FOR COMPONENT VALUES AND SUPPLIERS.

PART



MAX730A

MAX738A

MAX744A



INPUT SUPPLY RANGE (V)



6.0 to 11.0

6.0 to 16.0

10.2 to 16.0

6.0 to 9.0

9.0 to 16.0



GUARANTEED OUTPUT CURRENT AT 5V (mA)



450

750

500

750

NOTE: PIN NUMBERS REFER TO 8-PIN PACKAGES.

C7

2.2µF

OUTPUT

L2

25µH

FILTER

OUTPUT

MAX730A +5.2V TO +11.0V

MAX738A/MAX744A +6.0V TO +16.0V

OPTIONAL LOWPASS OUTPUT FILTER

Figure 3. Standard +5V Step-Down Application Circuit

1 2 ... 7 8 9 10 11 12 13 14 15 16

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