XL1509-5.0E1 power chips

The **XLSEMI XL1509-5.0E1** is a cost-effective, fixed 5.0 V output, monolithic step-down (buck) DC-DC converter capable of delivering up to 2 A continuous output current. It operates with a fixed 150 kHz PWM switching frequency, integrates a high-current power transistor, internal frequency compensation, and fixed-frequency oscillator — requiring only a minimal number of external components for a complete, high-efficiency solution.

**Key Specifications:**
– Brand: XLSEMI
– Part Number: XL1509-5.0E1
– Topology: Non-synchronous buck (step-down)
– Input Voltage Range: 4.5 V to 40 V
– Fixed Output Voltage: 5.0 V
– 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)
– Minimum Dropout Voltage: 1.5 V (typ.)
– Protection Features: Over-current protection with secondary current-limit frequency foldback (to 50 kHz), thermal shutdown
– Enable / Shutdown: TTL-compatible ON/OFF pin with hysteresis
– Package: SOIC-8
– Packaging: Tape & Reel
– Operating Temperature Range: –40 °C to +85 °C

**Typical Applications:**
– 12 V / 24 V / 30 V+ industrial and automotive power supplies
– Point-of-load 5 V regulation (1 A–3 A mid-current range)
– Battery chargers, adapters, and portable equipment
– LED drivers, consumer electronics, IoT devices
– Routers, set-top boxes, and general-purpose wide-input buck conversion

The XL1509-5.0E1 provides excellent line/load regulation, low output ripple, simple design-in, robust protection, and high efficiency in a compact SOIC-8 footprint — a proven, low-cost, and widely used 2 A step-down regulator ideal for 4.5–40 V to 5 V applications, especially in mid-current (1–3 A) designs with input voltages above 30 V.