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FAN5240QSCX データシート(PDF) 7 Page - Fairchild Semiconductor

部品番号 FAN5240QSCX
部品情報  Multi-Phase PWM Controller for AMD Mobile Athlon TM and Duron TM
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FAN5240
REV. 1.1.7 8/29/02
7
Circuit Description
Overview
The FAN5240 is a 2-phase, single output power management
IC, which supplies the low-voltage, high-current power to
modern processors for notebook PCs. Using very few exter-
nal components, the IC controls a precision programmable
synchronous buck converter driving external N-Channel
power MOSFETs. The output voltage is adjustable from
0.925V to 2.0V by changing the DAC (VID) code settings
(see Table 2). The output voltage of the core converter can be
changed on-the-fly with programmable slew rate, which
meets a key requirement of AMD's Mobile Athlon/Duron
processors.
The converter can operate in two modes: fixed frequency
PWM, and variable frequency hysteretic depending on the
load. At loads lower than the point where filter inductor cur-
rent becomes discontinuous, hysteretic mode of operation is
activated. Switchover from PWM to hysteretic operation at
light loads improves the converter's efficiency and prolongs
battery run time. As the filter inductor resumes continuous
current, the PWM mode of operation is restored.
Output Voltage Programming
The output voltage of the converter is programmed by an
internal DAC in discrete steps of 25mV from 0.925V to
1.300V and then in 50mV steps from 1.300V to 2.00V:
Table 2. Output voltage VID
1 - Logic High or open, 0 = Logic Low
VID0–4 pins will assume a logic 1 level if left open as each
input is pulled up with a 1
µA internal current source.
VID4
VID3
VID2
VID1
VID0
VOUT to CPU
11111
0.000
11110
0.925
11101
0.950
11100
0.975
11011
1.000
11010
1.025
11001
1.050
11000
1.075
10111
1.100
10110
1.125
10101
1.150
10100
1.175
10011
1.200
10010
1.225
10001
1.250
10000
1.275
01111
0.000
01110
1.300
01101
1.350
01100
1.400
01011
1.450
01010
1.500
01001
1.550
01000
1.600
00111
1.650
00110
1.700
00101
1.750
00100
1.800
00011
1.850
00010
1.900
00001
1.950
00000
2.000


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