1A, 76V, High-Efficiency MAXPower

Step-Down DC-DC Converter

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13

ground configuration). A ground plane is required.

Minimize lead lengths to reduce stray capacitance,

trace resistance, and radiated noise. In particular,

place the Schottky rectifier diode right next to the

device. Also, place BST and VD bypass capacitors

very close to the device. Use the PC board copper

MAX5035

GND

BST

LX

SGND

FB

D1

VD

L1

0.1

μF

0.1

μF

R1

R2

ON/OFF

Figure 2. Fixed Output Voltages

EXTERNAL COMPONENTS

7.5 to 76

3.3

0.5

7.5 to 76

3.3

1

R1 = 1M

Ω ±1%, 0805

R2 = 384k

Ω ±1%, 0805

D1 = 50SQ100, IR

L1 = 100µH, Coilcraft Inc., DO5022P-104

7.5 to 76

5

0.5

7.5 to 76

5

1

R1 = 1M

Ω ±1%, 0805

R2 = 384k

Ω ±1%, 0805

D1 = 50SQ100, IR

L1 = 100µH, Coilcraft Inc., DO5022P-104

15 to 76

12

1

R1 = 1M

Ω ±1%, 0805

R2 = 139k

Ω ±1%, 0805

D1 = 50SQ100, IR

L1 = 220µH, Coilcraft Inc., DO5022P-224

Table 2. Typical External Components Selection (Circuit of Figure 2)

Application Circuits