MAX17036 Maxim Integrated Products, MAX17036 Datasheet - Page 15

• Manufacturer Part Number: MAX17036
• Description: (MAX17030 / MAX17036) 1/2/3-Phase Quick-PWM IMVP-6.5 VID Controllers
• Manufacturer: Maxim Integrated Products

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32–38
PIN
20
21
22
23
24
25
26
27
28
29
30
31
39
PGD_IN
D0–D6
NAME
PWM3
BST2
BST1
CSP1
DH2
DH1
LX2
DL2
V
DL1
LX1
DD
______________________________________________________________________________________
PWM Signal Output for Phase 3. Swings from GND to V
(in shutdown, when CSP3 is connected to V
Phase 2 Boost Flying Capacitor Connection. BST2 is the internal upper supply rail for the DH2 high-
side gate driver. An internal switch between V
while the low-side MOSFET is on (DL2 pulled high).
Phase 2 Inductor Connection. LX2 is the internal lower supply rail for the DH2 high-side gate driver.
Also used as an input to phase 2’s zero-crossing comparator.
Phase 2 High-Side Gate-Driver Output. DH2 swings from LX2 to BST2. Low in shutdown.
Phase 2 Low-Side Gate-Driver Output. DL2 swings from GND to V
DL2 is forced high when an output overvoltage fault is detected, overriding any negative current-
limit condition that might be present. DL2 is forced low in skip mode after detecting an inductor
current zero crossing.
Open-Drain Output of Internal Comparator.
below 1.5V (30% of V
Supply Voltage Input for the DL_ Drivers. V
the BST_-LX_ flying capacitor during the times the respective DL_s are high. Connect V
4.5V to 5.5V system supply voltage. Bypass V
Phase 1 Low-Side Gate-Driver Output. DL1 swings from GND to V
DL1 is forced high when an output overvoltage fault is detected, overriding any negative current-
limit condition that might be present. DL1 is forced low in skip mode after detecting an inductor
current zero crossing.
Phase 1 High-Side Gate-Driver Output. DH1 swings from LX1 to BST1. Low in shutdown.
Phase 1 Inductor Connection. LX1 is the internal lower supply rail for the DH1 high-side gate driver.
Also used as an input to phase 1’s zero-crossing comparator.
Phase 1 Boost Flying Capacitor Connection. BST1 is the internal upper supply rail for the DH1 high-
side gate driver. An internal switch between V
while the low-side MOSFET is on (DL1 pulled high).
Power-Good Logic Input Pin that Indicates the Power Status of Other System Rails and Used for Supply
Sequencing. During startup, after soft-starting to the boot voltage, the output voltage remains at V
and the
stays low. When PGD_IN later goes high, the output is allowed to transition to the voltage set by the VID
code, and
immediately forces
mode at 1/4 the normal slew rate set by the TIME resistor. The output then stays at the boot voltage until
the controller is turned off or power cycled, or until PGD_IN goes high again.
Low-Voltage (1.0V Logic) VID DAC Code Inputs. The D0–D6 inputs do not have internal pullups. These
1.0V logic inputs are designed to interface directly with the CPU. The output voltage is set by the VID
code indicated by the logic-level voltages on D0–D6 (see Table 4).
The 1111111 code corresponds to a shutdown mode. When this code is detected, The
MAX17030/MAX17036 initiate a soft-shutdown transition identical to the shutdown transition for a
PWM3. The IC remains active and its V
operation. If D6–D0 is changed from 1111111 to a different code, the MAX17030/MAX17036 initiate a
startup sequence identical to the startup sequence for a
Positive Input of the Output Current Sense of Phase 1. This pin should be connected 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.
falling edge. After slewing the output to 0V, it forces DH_, DL_, and
and PWRGD outputs remain high and low, respectively, as long as the PGD_IN input
is allowed to go low. During normal operation, if PGD_IN goes low, the controller
CC
).
high and PWRGD low, and slews the output to the boot voltage while in skip
is high impedance in shutdown.
IMVP-6.5 VID Controllers
1/2/3-Phase Quick-PWM
CC
quiescent current consumption stays the same as in normal
DD
CC
FUNCTION
DD
is also the supply voltage used to internally recharge
DD
, and when operating with fewer than all phases).
DD
and BST2 charges the BST2-LX2 flying capacitor
and BST1 charges the BST1-LX1 flying capacitor
to GND with a 1µF or greater ceramic capacitor.
is pulled low when the voltage at THRM goes
Pin Description (continued)
DD
. Three-state whenever phase 3 is disabled
rising edge.
DD
DD
. DL2 is forced low in shutdown.
. DL1 is forced low in shutdown.
low, and three-states
DD
to the
BOOT
,
15