PW2312 Circuit Step-down DC-DC Converter

Table of Contents

The PW2312 is a high frequency, synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. It offers a very compact solution to achieve a 1.5A peak output current over a wide input supply range, with excellent load and line regulation.

Schematic PW2312 circuit step-down DC DC converter

Low-cost buck circuit with 4-30V input
Low-cost (0.31 yuan) synchronous rectification buck circuit, with overcurrent protection, overvoltage protection, 4-30V input, maximum current of 1.2A, peak current of 1.5A, static current of 5mA, 0.8V reference source.
For input voltages less than 15V, replace CIN with a 22uF 50V rated X7R ceramic capacitor. For input voltages greater than 15V, use a 100uF 6.3×5.4 35V rated aluminum electrolytic capacitor.

Output voltages:

3.30V: R1 47K, R2 15K
5.01V: R1 79K, R2 15K
6.00V: R1 130K, R2 20K
9.01V: R1 154K, R2 20K
12.00V: R1 210K, R2 15K
15.04V: R1 267K, R2 15K

BOM PW2312 circuit step-down DC-DC converter

Parts	Value	Description	Quantity
Capacitors
C1	0.1u	C0603 — SMD capacitor	1
C2	22pf	C0603 — SMD capacitor	1
CF1,CF2	0.1uF	C0603 — SMD capacitor	2
CIN	100UF/35V	6.3×6.6 SMD Electrolytic capacitor	1
COUT1,COUT2	22uF	C0805 — SMD inductor	2
L1	10uH	SMD,7.8×7 mm Power Inductor	1
Resistors 1/4W 5%
R1	79k 1%	R0603 — SMD Resistor	1
R2	15k 1%	R0603 — SMD Resistor	1
REN	100k	R0603 — SMD Resistor	1
Semiconductors
U1	PW2312A	SOT-23-6 30V, Synchronous Step Down Regulator	1