S-8550 SII [Seiko Instruments Inc], S-8550 Datasheet - Page 5

• Manufacturer Part Number: S-8550
• Description: STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECIFICATION, PWM CONTROL SWITCHING REGULATORS
• Manufacturer: SII [Seiko Instruments Inc]

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
Rev.2.1
Absolute Maximum Ratings
*1. When mounted on printed circuit board
Caution
VIN pin voltage
FB pin voltage
CONT pin voltage
ON/OFF pin voltage
CONT pin current
Power dissipation
Operating temperature
Storage temperature
[Mounted board]
_01
(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name: JEDEC STANDARD51-7
Parameter
1. The absolute maximum ratings are rated values exceeding which the product could suffer
2. Since this IC has a built-in power MOS FET, make sure that dissipation of the power MOS FET
physical damage. These values must therefore not be exceeded under any conditions.
does not exceed the allowable power dissipation of the package. (Refer to Figure 3.)
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.
Figure 3 Power Dissipation of Package (Mounted on Board)
V
V
V
V
I
P
T
T
CONT
opr
stg
IN
FB
CONT
ON/OFF
D
Table 3 Absolute Maximum Ratings
Symbol
700
600
500
400
300
200
100
Seiko Instruments Inc.
0
0
Ambient temperature (Ta) [°C]
50
(Unless otherwise specified: Ta = 25°C, V
100
Absolute Maximum Rating
V
V
V
V
SS
SS
SS
SS
− 0.3 to V
− 0.3 to V
− 0.3 to V
− 0.3 to V
−40 to +125
−40 to +85
150
1300
600
*1
SS
IN
IN
IN
+ 0.3
+ 0.3
+ 0.3
+ 6.0
S-8550/8551 Series
SS
Unit
mW
mA
°C
°C
V
V
V
V
= 0 V)
5