XL1509-ADJ Power Chips

The UMW XL1509-ADJ is a cost-effective, high-efficiency monolithic step-down (buck) DC-DC converter capable of delivering up to 2 A continuous output current. Featuring a fixed 150 kHz PWM switching frequency, integrated high-side power transistor, internal frequency compensation, and fixed-frequency oscillator, it requires minimal external components for a simple, reliable design.

Key Specifications:

• Brand: UMW
• Part Number: XL1509-ADJ
• Commodity Code: C2681227
• Topology: Non-synchronous buck (step-down)
• Input Voltage Range: 4.5 V to 40 V
• Output Voltage Range: 1.23 V to 37 V (adjustable via external feedback divider)
• Output Current: up to 2 A
• Switching Frequency: Fixed 150 kHz
• Quiescent Current (Iq): 2 mA (typ.)
• Duty Cycle Range: 0% to 100% (linear regulation)
• Protection Features: Over-current protection with secondary current-limit frequency foldback (to 50 kHz), thermal shutdown
• Enable Function: Built-in
• Package: SOIC-8
• Packaging: Tape & Reel
• Operating Temperature Range: –40 °C to +125 °C

Typical Applications:

• 12 V / 24 V industrial and automotive power supplies
• Point-of-load regulation for 3.3 V / 5 V / other rails
• Battery chargers and adapters
• LED drivers and general-purpose buck conversion
• Consumer electronics, IoT devices, routers, and set-top boxes

The XL1509-ADJ provides excellent line/load regulation, low output ripple, robust protection, and ease of use in a compact SOIC-8 footprint — a proven, low-cost 2 A adjustable buck regulator ideal for wide-input (4.5–40 V) applications in industrial, automotive, and consumer designs.