FAN5240 Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN5240

Multi-Phase PWM Controller for AMD Mobile Athlon™ and Duron™

Fairchild Semiconductor 

Pin Assignments (Continued)

Pin

Number

19

20

21

28

Pin

Name

PGOOD

SS

VIN

VCC

Pin Function Description

Power Good Flag. An open-drain output that will pull LOW when the core output below

825mV. PGOOD delays its low to high transition for a time determined by CDELAY when

VCORE rises above 875mV.

Soft Start. A capacitor from this pin to GND programs the slew rate of the converter during

initialization as well as in operation. This pin is used as the reference against which the

output is compared. During initialization, this pin is charged with a 25µA current source.

Once this pin reaches 0.5V, its function changes, and it assumes the value of the voltage as

set by the VID programming. The current driving this pin is then limited to ±500µA, that

together with CSS sets a controlled slew rate for VID code changes.

Input voltage from battery. This voltage is used by the oscillator for feed-forward

compensation of input voltage variation.

VCC. This pin powers the chip. The IC starts to operate when voltage on this pin exceeds

4.6V (UVLO rising) and shuts down when it drops below 4.3V (UVLO falling).

Absolute Maximum Ratings

The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The

device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables

are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the

conditions for actual device operation.

Parameter

VCC Supply Voltage

VIN

BOOT, SW, HDRV Pins

BOOT to SW

All Other Pins

Junction Temperature (TJ )

Storage Temperature

Lead Soldering Temperature, 10 seconds

Min.

–0.3

–10

–65

Typ.

Max.

6.5

27

33

6.5

VCC + 0.3

150

150

300

Units

V

V

V

V

V

°C

°C

°C

Recommended Operating Conditions

Parameter

Supply Voltage VCC

Supply Voltage VIN

Ambient Temperature (TA )

Conditions

Min.

4.75

6

–20

Typ.

5

Max.

5.25

24

85

Units

V

V

°C

4

www.fairchildsemi.com

FAN5240 Rev. 1.2.0

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