Pololu Adjustable Step-Up Step-Down Spannungsregler S7V8A

Pololu Adjustable Step-Up Step-Down Spannungsregler S7V8A

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9,95 € (Net 8,36 € )

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SKU: PO2118
GTIN: 4060137015649
Category: Step-Up/Step-Down
Manufacturers: Pololu
MPN: 2118
Storage Tiers: Maintain

Overview

The Pololu step-up/step-down voltage regulator S7V8A is a switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) that uses a buck-boost topology. It takes an input voltage from 2.7 V to 11.8 V and increases or decreases the voltage to a user-adjustable output between 2.5 V and 8 V with a typical efficiency of over 90%. The input voltage can be higher than, lower than, or equal to the set output voltage, and the voltage is regulated to achieve the set output voltage.

This flexibility in input voltage is especially well-suited for battery-powered applications in which the battery voltage begins above the desired output voltage and drops below the target as the battery discharges. Without the typical restriction on the battery voltage staying above the required voltage throughout its life, new battery packs and form factors can be considered. For example:

A 4-cell battery holder, which might have a 6 V output with fresh alkalines or a 4.0 V output with partially discharged NiMH cells, can be used with this regulator to power a 5 V circuit.
A single lithium-polymer cell can run a 3.3 V device through its whole discharge cycle.
A disposable 9 V battery powering a 5 V circuit can be discharged to under 3 V instead of cutting out at 6 V, as with typical linear or step-down regulators.

In typical applications, this regulator can deliver up to 1 A continuous when the input voltage is higher than the output voltage (stepping down). When the input voltage is lower than the output voltage (stepping up), the available current decreases as the difference between the voltages increases; please see the graphs at the bottom of this page for a more detailed characterization. The regulator has short-circuit protection, and thermal shutdown prevents damage from overheating; the board does not have reverse-voltage protection.

This regulator is also available with a fixed 3.3 V output or a fixed 5 V output.

Features

Input voltage: 2.7 V to 11.8 V
Output voltage adjustable from 2.5 V to 8 V
Typical continuous output current: 500 mA to 1 A across most combinations of input and output voltages (Actual continuous output current depends on input and output voltages. See Typical Efficiency and Output Current section below for details.)
Power-saving feature maintains high efficiency at low currents (quiescent current is less than 0.3 mA)
Integrated over-temperature and short-circuit protection
Small size: 0.45" × 0.65" × 0.1" (11 × 17 × 3 mm)
Complete schematic provided

Storage Tiers:	Maintain
Output Voltage max.:	8V
Output Voltage min.:	2.5V
Output Current max.:	1000mA
Operating Voltage max.:	11.8V
Operating Voltage min.:	2.7V
Regulator-Function:	Step Down/Step Up
Quiescent Current max.:	0.3mA
Output-Type:	adjustable
Shipping weight:	0,01 kg
Item weight:	0,00 kg
Dimensions ( Length × Width × Height ):	1,20 × 1,70 × 0,30 cm

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Total entries: 1

Backup-Spannung für RTCUhr und Ram von 3.350 V erzeugen
Ich nutze den StepUp/StepDown Spannungsregler (S7V8A) in Verbindung mit dem Adafruit USB/DC/Solar LiPo-Lader (AF4755) um damit eine stabile Backup-Spannung von 3.350 V zu erzeugen.
Der LiPo-Akku (3.0 V - 3.7 V) Spannungsbeeich, der USB/DC/Solar-Lader (4.1 V - 4.3) Spannungsbereich, einstellbarer SpannungsRegler S7V8A (2.5 V - 8.0 V) Spannungsbereich, erzeugt daraus 3.350 V Spannung.
Damit wird eine RTCUhr und ein Ram gebuffert, wobei mit 2x SchottkyDiode BAT86 (0.2V Durchlaß-Spannung) und einer CR2032 Batterie eine doppelte Sicherung der Backup-Spannung erreicht wird.
Die Spannung wird zwischen den beiden SchottkyDioden abgegriffen, der Spannungsregler S7V8A stellt 3.350 V bereit, (wird zu erst belastet), die CR2032 stellt 3.3 V bereit (wird solange nicht belastet, bis der LiPo-Akku leer ist.) , was im normal Betrieb nicht passieren sollte!

Reiner S , 25.11.2022 Verified purchase