Datasheet

Power
Supply
0.1 µF
1000 µF
Optimum
2.7 V to 5.5 V
PC Board
Overcurrent Response
TPS2041B
OC
GND
EN
IN
OUT
Block of
Circuitry
TPS2041B-EP
SLVSAX8 SEPTEMBER 2011
www.ti.com
Generic Hot-Plug Applications
In many applications, it may be necessary to remove modules or PC boards while the main unit is still operating.
These are considered hot-plug applications. Such implementations require the control of current surges seen by
the main power supply and the card being inserted. The most effective way to control these surges is to limit and
slowly ramp the current and voltage being applied to the card, similar to the way in which a power supply
normally turns on. Due to the controlled rise times and fall times of the TPS2041B, these devices can be used to
provide a softer startup to devices being hot-plugged into a powered system. The UVLO feature of the
TPS2041B also ensures that the switch is off after the card has been removed, and that the switch is off during
the next insertion. The UVLO feature ensures a soft start with a controlled rise time for every insertion of the card
or module.
Figure 27. Typical Hot-Plug Implementation
By placing the TPS2041B between the V
CC
input and the rest of the circuitry, the input power reaches these
devices first after insertion. The typical rise time of the switch is approximately 1 ms, providing a slow voltage
ramp at the output of the device. This implementation controls system surge currents and provides a
hot-plugging mechanism for any device.
DETAILED DESCRIPTION
Power Switch
The power switch is an N-channel MOSFET with a low on-state resistance. Configured as a high-side switch, the
power switch prevents current flow from OUT to IN and IN to OUT when disabled. The power switch supplies a
minimum current of 500 mA.
Charge Pump
An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate
of the MOSFET above the source. The charge pump operates from input voltages as low as 2.7 V and requires
little supply current.
Driver
The driver controls the gate voltage of the power switch. To limit large current surges and reduce the associated
electromagnetic interference (EMI) produced, the driver incorporates circuitry that controls the rise times and fall
times of the output voltage.
Enable (EN)
The logic enable pin disables the power switch and the bias for the charge pump, driver, and other circuitry to
reduce the supply current. The supply current is reduced to less than 1 μA or 2 μA when a logic high is present
on EN. A logic zero input on EN restores bias to the drive and control circuits and turns the switch on. The
enable input is compatible with both TTL and CMOS logic levels.
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Product Folder Link(s): TPS2041B-EP