Mini DC/DC Step-Down (Buck) Converter - 3.3V @ 1A output

TSR-1 switching buck regulator in SIP-3 package, outputs 3.3V at 1A from up to 36V input. Up to 91% efficient with no heat-sink or forced cooling needed. Requires an additional 10µF+ input capacitor for stability.

Logical pinout · physical placement not verified

+Vin1
Input supply pin for the TSR 1 step-down regulator module; Adafruit product page identifies this as TSR12433 / 3.3 V output module and the TSR 1 datasheet Pin-Out labels pin 1 as +Vin.
Type · PowerVoltage · TSR 1 datasheet lists a wide input operating range; exact model is the 3.3 V output TSR12433 sold by Adafruit product 1066.
GND2
Ground/common reference pin; TSR 1 datasheet Pin-Out labels pin 2 as GND.
Type · Ground
+Vout3
Regulated output pin; Adafruit product page title states 3.3 V @ 1 A output for TSR12433 and TSR 1 datasheet Pin-Out labels pin 3 as +Vout.
Type · PowerVoltage · 3.3 V output, up to 1 A per Adafruit product title for product 1066 / TSR12433.

Pin	Position	Type	Function	Voltage
+Vin	1	Power	Input supply pin for the TSR 1 step-down regulator module; Adafruit product page identifies this as TSR12433 / 3.3 V output module and the TSR 1 datasheet Pin-Out labels pin 1 as +Vin.	TSR 1 datasheet lists a wide input operating range; exact model is the 3.3 V output TSR12433 sold by Adafruit product 1066.
GND	2	Ground	Ground/common reference pin; TSR 1 datasheet Pin-Out labels pin 2 as GND.
+Vout	3	Power	Regulated output pin; Adafruit product page title states 3.3 V @ 1 A output for TSR12433 and TSR 1 datasheet Pin-Out labels pin 3 as +Vout.	3.3 V output, up to 1 A per Adafruit product title for product 1066 / TSR12433.

Logical pinout · physical placement not verified

Pin details

3 connections

+Vin
Input supply pin for the TSR 1 step-down regulator module; Adafruit product page identifies this as TSR12433 / 3.3 V output module and the TSR 1 datasheet Pin-Out labels pin 1 as +Vin.
PowerVoltage · TSR 1 datasheet lists a wide input operating range; exact model is the 3.3 V output TSR12433 sold by Adafruit product 1066.
1
GND
Ground/common reference pin; TSR 1 datasheet Pin-Out labels pin 2 as GND.
Ground
2
+Vout
Regulated output pin; Adafruit product page title states 3.3 V @ 1 A output for TSR12433 and TSR 1 datasheet Pin-Out labels pin 3 as +Vout.
PowerVoltage · 3.3 V output, up to 1 A per Adafruit product title for product 1066 / TSR12433.
3

Start wiring

3.3 V · 5 V · Module

The family now includes 9 V wall adapters at 650 mA, 1 A and 2.55 A. The voltage class matches, but current headroom, plug region, connec…

Module pins: +Vin, +Vout, GND. Schematik maps them to your board in the app.

Power supplies

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