MAX17080GTL+ Maxim Integrated Products, MAX17080GTL+ Datasheet - Page 17

• 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: -

PIN
14
15
16
17
18
19
PGD_IN
GNDS2
FBAC2
FBDC2
NAME
CSN2
CSP2
______________________________________________________________________________________
SMPS2 Remote Ground-Sense Input. Normally connected to GND directly at the load. GNDS2
internally connects to a transconductance amplifier that fine tunes the output voltage—
compensating for voltage drops from the SMPS ground to the load ground.
Connect GNDS1 or GNDS2 above 0.9V combined-mode operation (unified core). When GNDS2 is
pulled above 0.9V, GNDS1 is used as the remote ground-sense input.
Output of the Voltage-Positioning Transconductance Amplifier for SMPS2. The R and C network
between this pin and the positive side of the remote-sensed output voltage sets the transient AC
droop:
where R
trade-off between stability and load-transient response, Gm
value of the current-sense element that is used to provide the (CSP2, CSN2) current-sense voltage,
Z
FBAC2 is high impedance in shutdown.
Feedback-Sense Input for SMPS2. Connect a resistor R
of the feedback remote sense, and a capacitor from FBAC2 to couple the AC ripple from FBAC2 to
FBDC2. An integrator on FBDC2 corrects for output ripple and ground-sense offset.
To enable a DC load-line less than the AC load-line, add a resistor from FBAC2 to FBDC2.
To enable a DC load-line equal to the AC load-line, short FBAC2 to FBDC2. See the Core Steady-
State Voltage Positioning (DC Droop) section.
FBDC2 is high impedance in shutdown.
Negative Current-Sense Input for SMPS2. Connect to the negative side of the output current-sensing
resistor or the filtering capacitor if the DC resistance of the output inductor is utilized for current
sensing.
A 20
Positive Current-Sense Input for SMPS2. Connect to the positive side of the output current-sensing
resistor or the filtering capacitor if the DC resistance of the output inductor is utilized for current
sensing.
System Power-Good Input.
PGD_IN is low when
boot voltage. The SVI bits can be changed dynamically during this time while PGD_IN remains low
and PWRGD is still low.
PGD_IN goes high after the MAX17080 reaches the boot voltage. This indicates that the SVI block
is active, and the MAX17080 starts to respond to the SVI commands. The MAX17080 stores the
boot VID when PWRGD first goes high. The stored boot VID is cleared by rising
After PGD_IN has gone high, if at any time PGD_IN goes low, the MAX17080 regulates to the
previously stored boot VID. PWRGD is forced low until the internal DAC reaches the stored boot VID
plus an additional 20µs. The slew rate during this transition is set by the resistor between the TIME
and GND pins.
The subsequent rising edge of PGD_IN does not change the stored VID.
PWRGD is independent of PGD_IN.
CFB2
is the impedance of C
discharge FET is enabled from CSN2 to PGND when the SMPS2 is shut down.
DROOP_AC2
R
DROOP_AC2
AMD 2-/3-Output Mobile Serial
is the transient (AC) voltage-positioning slope that provides an acceptable
=
first goes high. The MAX17080 decodes the 2 SVI bits to determine the
FB2
R
FBAC2
.
R
+
FBAC2
R
FBDC2
FUNCTION
×
R
+ R
FBDC2
Pin Description (continued)
FB2 2
FBDC2
Z
CFB
(FBAC2)
between FBDC2 and the positive side
2
VID Controller
×
R
= 2mS (typ), R
SENSE2
×
Gm
SENSE2
(FBAC2)
.
is the
17