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AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
Pin Description (continued)
PIN
39
40
EP
NAME
FBDC1
GNDS1
EP
FUNCTION
Output of the DC Voltage-Positioning Transconductance Amplifier for SMPS1. Connect a resistor
R FBDC1 between FBDC1 and the positive side of the feedback remote sense to set the DC steady-
state droop based on the voltage-positioning gain requirement:
R FBDC1 = R DROOPDC / (R SENSE1 x G m(FBDC1) )
where R DROOPDC is the desired voltage-positioning slope and G m(FBDC1) = 1mS typ. R SENSE1 is the
value of the current-sense resistor that is used to PRO vide the (CSP1, CSN1) current-sense voltage.
To disable the load-line, short FBDC2 to the positive remote-sense point.
FBDC1 is high impedance in shutdown.
SMPS1 Remote Ground-Sense Input. Normally connected to GND directly at the load. GNDS1 internally
connects to a transconductance amplifier that fine tunes the output voltage compensating for voltage
drops from the regulator ground to the load ground.
GNDS1 is the remote ground-sense input in combined-mode operation.
Exposed Pad. Connect the exposed backside pad to GND1 and GND2.
Table 1 shows the component selection for standard applications and Table 2 lists component suppliers.
Table 1. Component Selection for Standard Applications
COMPONENT
MODE
Switching Frequency
C IN_ , Input Capacitor (per Phase)
C OUT_ , Output Capacitor
(per Phase)
N H_ High-Side MOSFET
N L_ Low-Side MOSFET
D L_ Schottky Rectifier
L_ Inductor
V IN = 7V TO 20V
V OUT = 1.0V - 1.3V / 18A PER PHASE
Separate, 2-phase mobile
(GNDS2 not high)
280kHz
(R OSC = 154k )
(2) 10μF, 25V
Taiyo Yuden TMK432BJ106KM
(2) 470μF, 2V, 6m ,
low-ESR capacitor
NEC/Tokin PSGD0E477M6 or
Panasonic EEFUD0D471L6
(1) Fairchildsemi
FDMS8690
(2) Vishay
Si7336ADP
3A, 40V Schottky diode
Central Semiconductor
CMSH3-40
0.45 μH, 30A, 1.1m power inductor
TOKO FDUE1040D-R45M or
NEC/Tokin MPC1040LR45
V IN = 4.5V TO 14V
V OUT_ = 1.0V - 1.3V / 18A PER PHASE
Separate, 2-phase mobile
(GNDS2 not high)
600kHz
(R OSC = 71.5k )
(2) 10μF, 16V
Taiyo Yuden TMK432BJ106KM
(2) 330μF, 2.5V, 6m ,
low-ESR capacitor
Panasonic EEFSD0D331XR
(1) International Rectifier
IRF7811W
(2) Fairchildsemi
FDMS8660S
None
0.22 μH, 25A, 1m power inductor
NEC/Tokin MPC0730LR20
Note: Mobile applications should be designed for separate mode operation. Component selection dependent on AMD CPU AC and
DC specifications.
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