MAX17080GTL+ Maxim Integrated Products, MAX17080GTL+ Datasheet - Page 31

• Manufacturer Part Number: MAX17080GTL+
• Description: IC CONTROLLER AMD SVI 40-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17080GTL+

• Applications: Controller, AMD SVI
• Voltage - Input: 2.7 ~ 5.5 V
• Number Of Outputs: 3
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

formed by the current-sense resistor’s parasitic induc-
tance:
where L
current-sense resistor, R
tance value, and C
stant matching components.
Using the DC resistance (R
allows higher efficiency. In this configuration, the initial
tolerance and temperature coefficient of the inductor’s
DCR must be accounted for in the output-voltage
droop-error budget and power monitor. This current-
sense method uses an RC filtering network to extract
the current information from the output inductor (see
Figure 6). The time constant of the RC network should
match the inductor’s time constant (L/R
Figure 6. Current-Sense Configurations
ESL
is the equivalent series inductance of the
R
______________________________________________________________________________________
L
SENSE
A) OUTPUT SERIES RESISTOR SENSING
B) LOSSLESS INDUCTOR DCR SENSING
ESL
SENSE
MAX17080
MAX17080
=
SENSE
R
and R
DCR
EQ SENSE
CSP_
CSN_
CSP_
CSN_
C
DH_
DH_
DL_
DL_
LX_
LX_
) of the output inductor
is current-sense resis-
EQ
are the time-con-
DCR
N
N
N
N
H
L
H
L
):
AMD 2-/3-Output Mobile Serial
D
D
C
C
L
L
IN
IN
L
INPUT (V
INPUT (V
R
LX
IN
IN
C
)
)
LX
R1
R
SENSE RESISTOR
L
EQ
ESL
L
INDUCTOR
where C
components. To minimize the current-sense error due to
the current-sense inputs’ bias current (I
choose R
to determine the sense capacitance (C
capacitors with 5% tolerance and resistors with 1% tol-
erance specifications. Temperature compensation is
recommended for this current-sense method. See the
Core Voltage Positioning and Loop Compensation sec-
tion for detailed information.
Additional R
LX_ and CSP_ pins if DCR sensing is used, and they
provide additional overdrive to the current-sense signal
to improve the noise immunity; otherwise, there might
be too much jitter or the system could be unstable.
R
R
SENSE
DCR
C
R2
C
EQ
EQ
SENSE
EQ
LX
less than 2kΩ and use the above equation
FOR THERMAL COMPENSATION:
R2 SHOULD CONSIST OF AN NTC RESISTOR
IN SERIES WITH A STANDARD THIN-FILM
RESISTOR.
and R
and C
C
C
OUT
OUT
R
DCR
L
EQ
VID Controller
C
R
R
LX
CS
DCR
EQ
R
=
EQ
=
=
are always added between the
are the time-constant matching
R1 + R2
=
C
R
R2
L
EQ
R
L
SENSE
EQ SENSE
ESL
×
× R
R1
C
1
DCR
+
R2
1
SENSE
CSP
and I
). Choose
CSN
31
),