MAX17009GTL+ Maxim Integrated Products, MAX17009GTL+ Datasheet - Page 30

• 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

Power-on reset (POR) occurs when V
approximately 2V, resetting the fault latch and prepar-
ing the controller for operation. The V
lockout (UVLO) circuitry inhibits switching until V
rises above 4.25V. The controller powers up the refer-
ence once the system enables the controller—V
above 4.25V and SHDN driven high. With the reference
in regulation, the controller ramps the SMPS and
NBV_BUF voltages to the boot voltage set by the SVC
and SVD inputs:
The soft-start circuitry does not use a variable current
limit, so full output current is available immediately.
PWRGD becomes high impedance approximately 20µs
AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
Figure 6. Startup Sequence
30
Power-Up Sequence (POR, UVLO, PGD_IN)
(VDD_PLANE_STRAP)
______________________________________________________________________________________
t
(
NBV BUF START
V
SVC/SVD
RESET_L
_
NBV_BUF
PGD_IN
PWRGD
GNDS2
V
DC_IN
V
CORE_
SHDN
DDIO
t
(
−
SMPS START
−
)
=
V
BOOT TIME NBV BUF
)
=
(
(
7
1
1
V
R
mV
μ
BOOT
A
×
/
μ
143
C
CC
s
2
CC
)
k
2-BIT BOOT VID
Ω
undervoltage
rises above
)
_
3
20μs
4
CC
CC
SERIAL MODE
10μs
5
after the SMPS outputs reach regulation. The boot VID is
stored the first time PWRGD goes high. The MAX17009
is in pulse-skipping mode during soft-start, and in
forced-PWM mode soft-shutdown.
The NB regulator soft-start time is set by the NB regula-
tor soft-start timer, or by t
longer.
For automatic startup, the battery voltage should be
present before V
the output into regulation without the battery voltage
present, the fault latch trips. The controller remains shut
down until the fault latch is cleared by toggling SHDN
or cycling the V
If the V
assumes that there is not enough supply voltage to
make valid decisions and could also result in the stored
boot VIDs being corrupted. As such, the MAX17009
immediately stops switching (DH_ and DL_ pulled low),
latches off, and discharges the outputs using the inter-
nal 10Ω switches from CSL_ to GND. See Figure 6.
HIGH IMPEDANCE
6
CC
BLANK
voltage drops below 4.25V, the controller
20μs
7
CC
CC
8
power supply below 0.5V.
. If the controller attempts to bring
BUS IDLE
(NBV_BUF-START)
, whichever is