MAX16048 Maxim Integrated Products, MAX16048 Datasheet - Page 59

• Manufacturer Part Number: MAX16048
• Description: (MAX16046 / MAX16048) 12-Channel/8-Channel EEPROM-Programmable System Managers
• Manufacturer: Maxim Integrated Products

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Figure 18. Power Circuit for Shutdown During Fault Conditions
The MAX16046/MAX16048 use external n-channel
MOSFET switches for voltage tracking applications. To
configure the part for closed-loop voltage tracking
using series-pass MOSFETs, configure up to four of the
programmable outputs (EN_OUT1–EN_OUT4) of the
MAX16046/MAX16048 as closed-loop tracking outputs
and configure up to four of the GPIOs as sense-return
inputs (INS1–INS4). Connect the EN_OUT_ output to
the gate of an n-channel MOSFET, connect the source
of the MOSFET to the INS_ feedback input, and monitor
the drain side of the MOSFET with the corresponding
MON_ input (see Figure 19). Both the input and the out-
put must be assigned to the same slot (see the
Closed–Loop Tracking section). Configure the power-
up and power-down slew rates in the configuration reg-
isters. To provide additional control over power-down,
enable the internal 100Ω pulldown resistors on the INS_
connections.
Up to six of the programmable outputs (EN_OUT1–
EN_OUT6) of the MAX16046/MAX16048 may be config-
ured as charge-pump outputs. In this case, they can
drive the gates of series-pass n-channel MOSFETS with-
out closed-loop tracking functionality. When configured
in this way, these outputs act as simple power switches
to turn on the voltage supply rails. Approximate the slew
rate, SR, using the following formula:
where I
rent, C
and C
to ground. Power-down is not well controlled due to the
absence of the 100Ω pulldowns.
System Managers with Nonvolatile Fault Registers
EXT
GATE
CP
Driving High-Side MOSFET Switches
V
is the capacitance connected from the gate
IN
12-Channel/8-Channel EEPROM-Programmable
is the 6µA (typ) charge-pump source cur-
is the gate capacitance of the MOSFET,
SR
______________________________________________________________________________________
C
=
(
C
GATE
V
CC
I
MAX16046
MAX16048
CP
+
GND
C
EXT
)
If more than six series-pass MOSFETs are required for
an application, additional series-pass p-channel
MOSFETS may be connected to outputs configured as
active-low open drain (Figure 20). Connect a pullup
resistor from the gate to the source of the MOSFET, and
ensure the absolute maximum ratings of the
MAX16046/MAX16048 are not exceeded.
Figure 19. Closed-Loop Tracking
Figure 20. Connection for a p-Channel Series-Pass MOSFET
REFERENCE
ADC MUX
LOGIC
RAMP
V
IN
MON_
V
IN
MON_
R
MAX16046
MAX16048
DRIVE
GATE
EN_OUT_
EN_OUT_
INS_
V
100Ω
TH_PG
V
V
OUT
OUT
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