S8540 datasheet(6/36 Pages) SII

6 / 36 page

STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

S-8540/8541 Series

Rev.4.0_01



Absolute Maximum Ratings

Table 4

(Ta = 25 °C unless otherwise specified)

Item

Symbol

Absolute Maximum Ratings

Unit

VIN pin voltage

VIN

VSS

− 0.3 to VSS + 12

CVREF pin voltage

VCVREF

VSS

− 0.3 to VIN + 0.3

ON/OFF pin voltage

VON/OFF

VSS

− 0.3 to VSS + 12

FB pin voltage*1

VFB

VSS

− 0.3 to VSS + 12

VOUT pin voltage

VOUT

VSS

− 0.3 to VSS + 12

SENSE pin voltage

VSENSE

VSS

− 0.3 to VSS + 12

EXT pin voltage

VEXT

VSS

− 0.3 to VIN + 0.3

EXT pin current

IEXT

± 100

Power dissipation

300 (When not mounted on board)

500*2

Operating ambient temperature

Topr

− 40 to + 85

°C

Storage temperature

Tstg

− 40 to + 125

°C

*1. Feed back type (B, D types)

*2. When mounted on board

[Mounted board]

(1) Board size :

114.3 mm

× 76.2 mm × t1.6 mm

(2) Board name : JEDEC STANDARD51-7

Caution 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.

(1) When mounted on board

(2) When not mounted on board

100

150

400

200

Ambient temperature Ta (

°C)

500

300

100

600

100

150

200

100

Ambient temperature Ta (

°C)

250

150

300

350

Figure 4 Power Dissipation of Package

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