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MAX750A

Adjustable, Step-Down, Current-Mode PWM Regulators

Maxim Integrated 

Adjustable, Step-Down,

Current-Mode PWM Regulators

MAX750A: 4.0V TO 11.0V

MAX758A: 4.0V TO 16.0V

8

1

V+

SHDN

7

LX

R1

510k

MAX750A

MAX758A I.C. 5

C1

0.1µF

3

SS

GND

6

CC 4

REF

2 C6

0.01µF

C2

1µF

C3*

D1

IN5817

C5

330pF

R2

40.2k

R3

13.0k

L1*

OUTPUT

5V

C4*

OPTIONAL LOWPASS OUTPUT FILTER

L2

25µF

OUTPUT

FILTER

OUTPUT

C7

2.2µF

PART INPUT SUPPLY RANGE GUARANTEED OUTPUT CURRENT AT 5V OUTPUT

(V)

(mA)

MAX750A

6.0 to 11.0

450

MAX758A

6.0 to 16.0

450

10.2 to 16.0

750

NOTE: PIN NUMBERS REFER TO 8-PIN PACKAGES.

* SEE TABLE 2 FOR EXTERNAL COMPONENT SUPPLIERS.

Figure 3. Standard Step-Down Circuit

and GND pins as possible. Also, place the output

capacitor as close to the inductor and the GND pin as

possible. The traces connecting the input and output

filter capacitors and the catch diode must be short to

minimize inductance and capacitance. For this reason,

avoid using sockets, and solder the IC directly to the

PC board. Use an uninterrupted ground plane if possi-

ble; otherwise, use a star ground connection.

Output-Ripple Filtering

A simple lowpass pi-filter (Figure 3) can be added to

the output to reduce output ripple to about 5mVp-p.

The cutoff frequency with the values shown is 21kHz.

Since the filter inductor is in series with the circuit out-

put, its resistance should be kept to a minimum so the

voltage drop across it is not excessive.

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