MAX16048ACB+ Maxim Integrated Products, MAX16048ACB+ Datasheet - Page 62

• Manufacturer Part Number: MAX16048ACB+
• Description: IC EE-PROG SYS MGR 8CH 64-TQFP
• Manufacturer: Maxim Integrated Products
• Type: System Managerr

Specifications of MAX16048ACB+

• Number Of Voltages Monitored: 8
• Output: Open Drain, Push-Pull
• Reset: Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
The MAX16046A/MAX16048A 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
MAX16046A/MAX16048A as closed-loop tracking out-
puts 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 cor-
responding MON_ input (see Figure 19). Both the input
and the output must be assigned to the same slot (see
the Closed–Loop Tracking section). Configure the
power-up and power-down slew rates in the configura-
tion registers. 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 MAX16046A/MAX16048A may be con-
figured 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.
Figure 18. Power Circuit for Shutdown During Fault Conditions
62
______________________________________________________________________________________
EXT
GATE
CP
Driving High-Side MOSFET Switches
V
IN
is the capacitance connected from the gate
is the 6µA (typ) charge-pump source cur-
is the gate capacitance of the MOSFET,
SR
C
=
(
C
GATE
V
CC
I
MAX16046A
MAX16048A
CP
+
C
GND
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
MAX16046A/MAX16048A 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
MAX16046A
MAX16048A
DRIVE
GATE
EN_OUT_
EN_OUT_
INS_
V
100Ω
TH_PG
V
V
OUT
OUT