MAX17009GTL+ Maxim Integrated Products, MAX17009GTL+ Datasheet - Page 32

• Manufacturer Part Number: MAX17009GTL+
• Description: IC CTLR VIDEO SERIAL DUAL 40TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17009GTL+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

When SHDN goes low, the MAX17009 enters the low-
power shutdown mode. PWRGD is pulled low immedi-
ately, and the SMPS output voltages ramp down at
1mV/µs, while the NBV_BUF output slews at a rate set
by R
DL_ is kept low, and the 10Ω switches from CSL_ to
GND are enabled, holding the outputs low:
Slowly discharging the output capacitors by slewing the
output over a long period of time keeps the average
negative inductor current low (damped response), there-
by eliminating the negative output-voltage excursion that
AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
Figure 7. PGD_IN Timing Figure
32
(NBV_BUF TARGET)
(CORE0 TARGET)
(CORE1 TARGET)
t
______________________________________________________________________________________
TIME
(
NBV BUF SHDN
(PRO = OPEN)
V
SVC/SVD
SVC/SVD
NBV_BUF
PGD_IN
PWRGD
. At the end of the soft-shutdown sequence,
V
V
_
CORE0
CORE1
NOTE: MAX17009 IS IN SKIP MODE.
CORE0 IS LIGHTLY LOADED.
CORE1 IS HEAVILY LOADED.
−
t
(
SMPS SHDN
)
−
=
BUS IDLE
BUS IDLE
V
NBV BUF TIME NBV BUF
)
=
_
(
(
1
7
mV
V
μ
OUT
A
R
/
×
μ
143
s
)
C
k
Ω
Shutdown
20μs
)
_
SVC/SVD INPUTS DISABLED
2-BIT BOOT VID
occurs when the controller discharges the output quick-
ly by permanently turning on the low-side MOSFET
(underdamped response). This eliminates the need for
the Schottky diode normally connected between the out-
put and ground to clamp the negative output-voltage
excursion. The MAX17009 shuts down completely—the
drivers are disabled, the reference turns off, and the
supply currents drop to about 1µA (max)—20µs after
the controller reaches the 0V target. When a fault condi-
tion—overvoltage or undervoltage—occurs on one
SMPS, the other SMPS and the NBV_BUF immediately
go through the soft-shutdown sequence. To clear the
fault latch and reactivate the controller, toggle SHDN or
cycle V
Soft-shutdown for the NB regulator is determined by the
particular NB regulator’s shutdown behavior. In the typ-
ical application, the NB regulator’s SHDN pin or enable
pin is toggled at the same time as the MAX17009’s
SHDN pin.
CC
power below 0.5V.
HIGH IMPEDANCE
BLANK
20μs
BUS IDLE
BUS IDLE