STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

S-8550 Series

5



Absolute Maximum Ratings

Table 3 Absolute Maximum Ratings

(Unless otherwise specified: Ta

Item

Symbol

Absolute Maximum Rating

Unit

VIN pin voltage

V

FB pin voltage

V

CONT pin voltage

V

ON/OFF pin voltage

V

CONT pin current

1300

mA

Power

dissipation

SOT-23-5

mW

SNT-8A

mW

Operating temperature

−40 to +85

°C

Storage temperature

−40 to +125

°C

*1. When mounted on printed circuit board

[Mounted board]

(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm

(2) Board name: JEDEC STANDARD51-7

Caution 1. The absolute maximum ratings are rated values exceeding which the product could suffer

physical damage. These values must therefore not be exceeded under any conditions.

2. Since this IC has a built-in power MOS FET, make sure that dissipation of the power MOS FET

does not exceed the allowable power dissipation of the package. (Refer to Figure 5.)

Generally, dissipation of a switching regulator can be calculated by the following equation.

Dissipation = (100 (%)

− efficiency (%)) / efficiency (%) × output voltage × load current

The greater part of dissipation depends on the built-in power MOS FET, however, dissipation

of the inductor is also included.

In addition, since power dissipation of the package also changes according to a mounting

board or a mounting state, fully check them using an actually mounted mode.

0

400

0

Ambient temperature (Ta) [

°C]

200

500

300

100

600

700

50

100

150

SNT-8A

SOT-23-5

Figure 5 Power Dissipation of Package (Mounted on Board)