FAN5240 Datasheet, PDF (4/19 Pages) Fairchild Semiconductor – Multi-Phase PWM Controller for AMD Mobile Athlon TM and Duron TM

FAN5240
PRODUCT SPECIFICATION
Pin Definitions (continued)
Pin
Number
20
21
28
Pin
Name
SS
VIN
VCC
Pin Function Description
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
Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life
impaired. Functional operation under these conditions is not implied.
Parameter
Min.
Typ.
Max.
Units
VCC Supply Voltage:
VIN
BOOT, SW, HDRV Pins
BOOT to SW
All Other Pins
Junction Temperature (TJ )
Storage Temperature
Lead Soldering Temperature, 10 seconds
–0.3
–10
–65
6.5
V
27
V
33
V
6.5
V
VCC+0.3
V
150
°C
150
°C
300
°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
REV. 1.1.7 8/29/02