Datasheet

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GENERIC HOT-PLUG APPLICATIONS (Figure 40 )

Power

Supply

Block of

Circuitry

TPS2034

GND

OUT

0.1 µF

1000 µF

Optimum

2.7 V to 5.5 V

PC Board

Overcurrent Response

TPS2030 , TPS2031

TPS2032 , TPS2033 , TPS2034

SLVS190C – DECEMBER 1998 – REVISED OCTOBER 2007

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. Because of the controlled rise times and fall times of the TPS203x series, these devices can

be used to provide a softer start-up to devices being hot-plugged into a powered system. The UVLO feature of

the TPS203x also ensures the switch will be off after the card has been removed, and the switch will be 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 40. Typical Hot-Plug Implementation

By placing the TPS203x between the V

input and the rest of the circuitry, the input power will reach this device

first after insertion. The typical rise time of the switch is approximately 9 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.

Product Folder Link(s): TPS2030 TPS2031 TPS2032 TPS2033 TPS2034