Rev. 1.12

- 8 -

s

s

s

s TYPICAL APPLICATION AND TECHNICAL NOTES

1) Fixed Output Voltage Type

AGND

MODE

CE

PGND

Lx

LOAD

L

L

: 10

µH LQH3C100K54(Murata)

µF ECSTOJX106R(Panasonic)

: 10

µF C3216JB0J106M(TDK)

2) Adjustable Output Voltage Type

Rb

Cb

AGND

MODE

CE

PGND

LOAD

R1

R2

L

L:

10

µH LQH3C100K54 (Murata)

µF ECSTOJX106R (Panasonic)

µF C3216JB0J106M (TDK)

Standard value of the sum of Divider Resistors, R1+R2 is as much as 100k

Ω.

Cb value for phase compensation depends on values of L, C, and R1. Refer to the technical notes.

If a ceramic capacitor is used as an output capacitor, add 0.2

Ω or more resistance to compensate the ESR of the

capacitor.

When you use these ICs, consider the following issues;

q

q

When you control the CE pin and MODE pin by another power supply, do not make its "H" level more than the

q

q

At stand by mode, (CE=”L”), the Lx output is Hi-Z, or both P-channel transistor and N-channel transistor of Lx pin

turn off.

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µF or more, and with good high frequency characteristics

such as tantalum capacitors.

q

At VFM mode, (MODE=”H”), Latch protection circuit does not operate.