TPS2421-1_16 Datasheet, PDF (17/31 Pages) Texas Instruments – 5-A, 20-V Integrated FET Hot Swap

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10 Application and Implementation
TPS2421-1, TPS2421-2
SLUS907I – JANUARY 2009 – REVISED JANUARY 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
10.2 Typical Application
The TPS2421 is an integrated FET hot swap device. It is typically used for Hot-Swap and Power rail protection
applications. It operates from 3 V to 20 V with programmable fault current limit, and fault Timer.
The following design procedure can be used to select component values for the device. This section presents a
simplified discussion of the design process.
12-V Bus
3 VIN
VOUT 7
2 EN
GND
4
TPS2421
FLT 1
ISET
5
PG 8
CT
6
Optional:
To System
Monitor
C_LOAD
80.6 k
0.56 µF
Figure 14. Design Example Schematic
10.2.1 Design Requirements
A typical design is shown in Figure 14 with the following requirements:
• Nominal input voltage, V_VIN: 12 V
• Maximum expected load current, I_VOUT: 2.1 A
• Load capacitance, C_LOAD: 220 µF
• Expected resistive load, R_LOAD during start up: 15 Ω
• Example calculations are shown in the TPS2421 Design Calculator Tool (SLUC427).
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Product Folder Links: TPS2421-1 TPS2421-2