Pololu Mini Pushbutton Power Switch with Reverse Voltage Pro

Pololu Mini Pushbutton Power Switch with Reve

Pololu

Pololu Mini Pushbutton Power Switch with Reverse Voltage Protection, LV

Name: Pololu Mini Pushbutton Power Switch with Reverse Voltage Protection, LV
Brand: Pololu
SKU: PO2808
Price: 6.58 USD
Availability: InStock
Rating: 5.0 (1 reviews)

Item No.: PO2808

HAN: 2808

EAN: 4060137017889

HS Code: 8536501190

Herkunftsland: US

Lagerstufe: Tier1

5.0 / 1 review

6,58 $

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Net: 5,53 $

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Description
Reviews (1)

Product Description

Overview

The Pololu Pushbutton Power Switch is a compact, solid-state power switch that features built-in reverse-voltage protection and is controlled by a momentary pushbutton: one push turns on power and another push turns it off. This is a patented design initially created for use in our own products as an alternative to bulky mechanical switches. Because the switched current does not flow through the mechanical switch, a large variety of small, low-power switches can be used to control a substantial amount of power. The use of momentary switches also allows multiple switches to be used in parallel to control the power to one load.

The board has a small pushbutton already installed and offers convenient points for connecting external pushbutton or tactile switches in parallel. It also offers several alternate pushbutton connection options that result in push-on-only or push-off-only operation, and additional inputs enable further power control options like allowing the load to turn off its own power, which can be beneficial when used with battery chemistries sensitive to over-discharging.

Warning: Do not use this switch as an emergency cutoff or similar safety disconnect in applications where failure to cut power could lead to injury or property damage.

The switch and control inputs control the state of a latching circuit that in turn controls a pair of power MOSFETs through which the main current flows. Four versions of the Pololu Pushbutton Power Switches are available:

Mini Pushbutton Power Switch LV
Mini Pushbutton Power Switch SV
Big Pushbutton Power Switch MP
Big Pushbutton Power Switch HP

The two Mini Pushbutton Power Switches are smaller, lower-current versions that are useful for applications with tight size constraints or lower power requirements. Also, the the Mini LV is the only one of the four that works below 4.5 V; since it can operate down to 2.2 V, this version can be used with a single lithium cell battery.

The pinout of the Big version is the same as the pinout of the Mini version with several additional redundant connection points for convenience, including main power connections that are compatible with 5 mm terminal blocks.

The primary functional difference between the each of the units arises from the MOSFET used, which sets the operating range and performance of the units:

Spezifikation

The Pololu Pushbutton Power Switch works well in its intended application as a DC power switch for small robots, but because it is fundamentally different from a mechanical power switch, the benefits and drawbacks of the components must be fully considered.

Benefits over mechanical switches:

Compact size
Reverse-voltage protection
Allows multiple (parallel) switches for improved user interface
Better turn-on characteristics than a bouncing mechanical switch
Limited LC spikes for low-resistance loads
Allows self-shutoff (OFF input)
Allows external digital device to control the power state (ON and CTRL inputs)
Breadboard and perfboard compatible (0.1?-pitch)

Drawbacks compared to mechanical switches:

Switch is one-directional (power applied to VOUT cannot be switched to VIN)
Limited operating voltage range
Switch can lose its state when power is disconnected (the switch typically defaults to being off when power is first applied, but it can default to being on near the upper end of the operating range)
Switches DC only (does not maintain state through power disruptions or excessive noise)
No complete isolation in off state

Technical documents / Downloads

User GuideDocument (PDF)Download

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21.09.2020 Verified purchase Voucher received

Nur gut

Das Ding ist nur gut! Mit einem einfachen Taster lässt sich eine Spannung an- und ausschalten. Das kann aber auch z.B. durch einen Arduino passieren, der sich dann selbst ausschalten kann.

Valentin W

Manufacturer according to GPSR
Pololu Corporation, Pilot Rd. 920, 89119 Las Vegas, Nevada, Vereinigte Staaten, [email protected], https://www.pololu.com/