APS1056IGV-1.8-T1 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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APS1056IGV-1.8-T1

Fast Transient 600mA Step-Down Converter

Advanced Analogic Technologies 

APS1056

Fast Transient 600mA Step-Down Converter

Figure 2: APS1056 Sample Layout

Top Side.

Figure 3: Exploded View of Sample Layout

Figure 4: APS1056 Sample Layout

Bottom Side.

The maximum output capacitor RMS ripple current

is given by:

I = RMS(MAX)

1

2·

·

3

VOUT · (VIN(MAX) - VOUT)

L · F · VIN(MAX)

Dissipation due to the RMS current in the ceramic

output capacitor ESR is typically minimal, resulting in

less than a few degrees rise in hot-spot temperature.

Adjustable Output Resistor Selection

For applications requiring an adjustable output volt-

age, the 0.6V version can be externally pro-

grammed. Resistors R1 and R2 of Figure 5 program

the output to regulate at a voltage higher than 0.6V.

To limit the bias current required for the external

feedback resistor string while maintaining good noise

immunity, the minimum suggested value for R2 is

59kΩ. Although a larger value will further reduce qui-

escent current, it will also increase the impedance of

the feedback node, making it more sensitive to exter-

nal noise and interference. Table 2 summarizes the

resistor values for various output voltages with R2

set to either 59kΩ for good noise immunity or 221kΩ

for reduced no load input current.

R1

=

⎛ VOUT

⎝ VREF

-1⎞⎠

·

R2

=

⎛ 1.5V

⎝ 0.6V

-

1 ⎞⎠

·

59kΩ

=

88.5kΩ

APS1056.2007.04.0.9 (PRELIMINARY INFORMATION)

13

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