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AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
INPUT (V IN )
C IN
DH_
N H
SENSE RESISTOR
LX_
L
ESL
R SENSE
MAX17009
DL_
GND
N L
D L
R EQ
C SENSE
C OUT
CSP_
CSN_
A) SERIES SENSE-RESISTOR SENSING
INPUT (V IN )
C IN
DH_
N H
INDUCTOR
LX_
L ESL
R DCR
MAX17009
DL_
N L
D L
R1
R2
C OUT
R EQ =
(
R2
R1 + R2
)
R DCR
+
GND
R DCR =
L
C SENSE
[
1 1
R1 R2
]
CSP_
C SENSE
CSN_
FOR THERMAL COMPENSATION:
B) OUTPUT INDUCTOR DCR SENSING
R2 SHOULD CONSIST OF AN NTC RESISTOR IN
SERIES WITH A STANDARD THIN-FILM RESISTOR.
Figure 5. Current-Sense Configurations
L ESL
R SENSE
= R EQ C SENSE
current balance between the phases. This control
scheme regulates the peak inductor current of each
phase, forcing them to remain properly balanced.
where L ESL is the equivalent series inductance of the
current-sense resistor, R SENSE is current-sense resis-
tance value, and C SENSE and R EQ are the time-con-
stant matching components.
Combined-Mode Current Balance
When configured in combined mode, the MAX17009
current-mode architecture automatically forces the
individual phases to remain current balanced. SMPS1 is
the main voltage-control loop, and SMPS2 maintains the
Therefore, the average inductor current variation
depends mainly on the variation in the current-sense ele-
ment and inductance value.
Peak Current Limit
The MAX17009 current-limit circuit employs a fast peak
inductor current-sensing algorithm. Once the current-
sense signal (CSP to CSN) of the active phase exceeds
the peak current-limit threshold, the PWM controller ter-
minates the on-time. See the Peak-Inductor Current
Limit section in the SMPS Design Procedure section.
______________________________________________________________________________________
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