Charge

Pump

Driver

UVLO

Current

Limit

Thermal

Sense

9-ms

Deglitch

IN

GND

OUT

FLT

Current

Sense

(Disabled+

UVLO)

OTSD

CS

EN or

EN

Copyright © 2016, Texas Instruments Incorporated

10

TPS2001D

SLVSE25A – JULY 2017 – REVISED OCTOBER 2017

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Product Folder Links: TPS2001D

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Copyright © 2017, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TPS2001D is a current-limited, power-distribution switch providing 2-A continuous load current in 5-V

circuits. The device uses an N-channel MOSFET for low resistance, maintaining voltage regulation to the load. It

is designed for applications where short circuits or heavy capacitive loads are encountered. Device features

include

enable,

reverse

blocking

when

disabled,

output

discharge

pulldown,

overcurrent

protection,

overtemperature protection, and deglitched fault reporting.

8.2 Functional Block Diagram

Figure 19. TPS2001D Block Diagram

8.3 Feature Description

8.3.1 Undervoltage Lockout

The undervoltage lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO turn-

on threshold. Built-in hysteresis prevents unwanted ON/OFF cycling due to input voltage drop from large current

surges. FLT is high impedance when the TPS2001D is in UVLO.

8.3.2 Enable

The logic enable input (EN), controls the power switch, bias for the charge pump, driver, and other circuits. The

supply current is reduced to less than 1 µA when the TPS2001D is disabled. Disabling the TPS2001D

immediately clears an active FLT indication. The enable input is compatible with both TTL and CMOS logic

levels.

are internally controlled. The rise time is controlled by both the TPS2001D and the external loading (especially

consisting of only a resistor experiences a fall time set by the device. An output load with parallel R and C

The enable must not be left open, and may be tied to VIN or GND depending on the device.