LM5068MM-4/NOPB National Semiconductor, LM5068MM-4/NOPB Datasheet - Page 15

• Manufacturer Part Number: LM5068MM-4/NOPB
• Description: IC CONTROLLER HOTSWAP -48V 8MSOP
• Manufacturer: National Semiconductor
• Type: Hot-Swap Controllerr

Specifications of LM5068MM-4/NOPB

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: -10 V ~ -90 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• For Use With: LM5068EVAL - EVALUATION BOARD FOR LM5068
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM5068MM-4; LM5068MM-4TR

Timing Diagrams
Assuming all of the initial conditions are met, the power-up
sequence starts with Timer capacitor (C
C
quickly discharge to V
GATE current source is enabled. The GATE voltage in-
creases until the MOSFET starts conducting causing the
SENSE voltage to increase until Active Current Limiting is
T
is charged with 6µA current source up to V
TLVT
(1V). At time point (2) the 60µA
FIGURE 5. System Power-Up Timing Behavior
T
) getting charged.
THVT
(4V) then
15
activated (3). During the current limiting period (3-4), C
charged again, but there is not enough time to reach the 4V
threshold before the load capacitor is fully charged and the
SENSE voltage falls below V
enhance the MOSFET and activating the PWRGD when the
GATE voltage exceeds 8V.
20078625
CB
. The GATE continues to fully
www.national.com
T
is