# DC-DC converter, S09, automotive Buck-Boost, 2.5–15V to 3.3V, 600mA

- Page: https://sigmanortec.ro/en/dc-dc-converter-s09-automotive-buck-boost-2515v-to-33v-600ma
- Price: 7.02 RON
- Availability: In stock; 1-2 zile
- Reference: 88294 · EAN: 5947219661545
- Category: Electronic components > Other Tension Modules
- Specifications: Dimensions: 19 x 14 x 4 mm; Type: automatic DC-DC buck-boost converter; Output voltage: 3.3 V DC; Operating temperature: -20 ~ 85 °C; Output current: 600 mA; Input voltage: 2.5-15 V DC; Operating frequency: up to 1.2 MHz; Mounting: SMD or pins with 2.54 mm pitch; Efficiency: up to 75%; Accuracy: ±0.1 V; Standby consumption: under 200 µA; Insulation: not galvanically isolated; Output ripple: under 50 mV
- Updated: 2026-10-27
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-11-11 01:49 (Europe/Bucharest)

## Description

DC-DC S09 auto buck-boost converter that maintains a fixed 3.3 V output regardless of whether the 2.5-15 V input is higher or lower, with up to 600 mA, 1.2 MHz switching frequency, under 200 uA quiescent current, and shutdown function via the EN pin, ideal for stable power supply of 3.3 V loads directly from a battery or Li-ion аккумулятор.
The S09 module is an automatic DC-DC buck-boost converter (step up / step down) that maintains a fixed 3.3 VDC output regardless of whether the input voltage is higher, equal to, or lower than this value. It is a compact solution for stable power supply of 3.3 VDC loads directly from a battery, a Li-ion cell, or any source with a variable voltage between 2.5 and 15 VDC, making it suitable for radio modules, industrial motherboards, chargers and portable devices, automotive electronics, models, and battery-powered monitoring systems.
The converter operates in an automatic buck-boost topology, switching internally at a working frequency of up to 1.2 MHz to keep the output stable at 3.3 VDC, with an accuracy of +/- 0.1 V and an output ripple below 50 mV. The maximum output current is 600 mA, and the module's no-load current consumption is below 200 uA, which makes it suitable for battery-powered applications that need to run for a long time between charges. The module also supports an off (cut off) function via the EN pin, but it does not have galvanic isolation between input and output.
Among the main features are the two visible SMD inductors on the top side of the board, the rectifier diode, the control integrated circuit, and the filtering capacitor group, all mounted on a small board measuring 19 x 14 x 4 mm, made of industrial-quality components for stable long-term operation. Power is supplied through the VIN+ and VIN- pads located on one side of the board, while the 3.3 VDC output is available on the Vout+ and Vout- pads on the opposite side.
As a 3.3 VDC power supply with a stable output, the module is compatible with any board or circuit operating at this voltage level, including ESP8266 and ESP32 modules, radio modules, sensors, and microcontrollers powered at 3.3 V from a variable source such as a Li-ion cell.
Specifications:
Input voltage: 2.5 - 15 VDC
Maximum output current: 600 mA
Output voltage: 3.3 VDC (fixed)
Type: automatic DC-DC buck-boost converter (step up / step down)
Working frequency: up to 1.2 MHz
Quiescent current: below 200 uA
Efficiency: up to 75%
Output ripple: below 50 mV
Output accuracy: +/- 0.1 V
Shutdown function: supported, via EN pin
Galvanic isolation: no isolation between input and output
Operating temperature: -20 ~ 85°C
Mounting: SMD or 2.54 mm pitch pins
Dimensions: 19 x 14 x 4 mm
Pinout:
Connector
Pin
Function
Input pads
VIN+
Positive power input, 2.5 - 15 VDC
Input pads
VIN-
Negative power input, ground
Input pads
EN
Enable pin, usually connected to VIN+ for continuous operation
Output pads
Vout+
3.3 VDC output to load
Output pads
Vout-
Output ground
Level on EN
Module state
High level (connected to VIN+)
Module active, 3.3 VDC output present
Low level (connected to ground)
Output off (cut off)
Usage:
Connect the power source with a voltage between 2.5 and 15 VDC to the VIN+ and VIN- pads, respecting polarity, because the module does not have input reverse-polarity protection.
Connect the EN pin to VIN+ so that the module starts automatically when powered, or use EN as a control input, driving it high for turn-on and to ground for output shutdown.
Connect the 3.3 VDC load to the Vout+ and Vout- pads, respecting polarity.
Do not exceed the maximum output current of 600 mA and, for long-term reliability, keep consumption below approximately 500 mA in continuous operation.
Mount the module by direct SMD soldering onto the PCB or using 2.54 mm pitch pins, depending on the needs of the project.
Check the output voltage with a voltmeter before connecting the final load, especially if you have changed the wiring of the EN pin.
Dimensions diagram: