MC34726(2008) データシートの表示（PDF） - Freescale Semiconductor

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MC34726
(Rev.:2008)

300mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode

Freescale Semiconductor 

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 5. Dynamic Electrical Characteristics

Characteristics noted under conditions; 2.7V ≤ VIN ≤5.5V, 0.8V ≤ VOUT ≤3.3V, -20oC ≤ TA ≤ 85oC, CIN = COUT = 4.7µF,

L1 = 4.7µH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions;

TA = +25oC, VIN = 3.6V, fSW = 2.0MHz with the typical operating circuit (See Figure 1), unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

Switching Frequency(7)

Maximum Duty Cycle(8)

Measured from SW pin

fSW

1.8

2.0

2.2

MHz

DMAX

95

%

-

100

Internal Soft-start Timer

VOUT Rise Time

tS

ms

-

2.0

-

Notes

7. fSW can be factory programmed to ±20% of nominal 2.0MHz.

8. The maximum duty limits the range of output voltages achievable for a given input voltage.

Analog Integrated Circuit Device Data

Freescale Semiconductor

34726

7

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