XDL603 Series

18V Operation 500mA Inductor Built-in Step-down “micro DC/DC” Converter

The XDL603 series is an ultra compact step-down DC / DC converter that integrates a coil and a control IC in one tiny package. By adding a ceramic capacitor for input / output and a resistor for output voltage setting to external parts, a power supply circuit of up to 500mA can be created. An internal coil simplifies the circuit and enables minimization of noise and other operational trouble due to the circuit wiring.

XDL603 series has operating voltage range of 3.0V~18.0V and it can support 500mA as an output current with high-efficiency. They use synchronous rectification at an operating frequency of 2.2MHz. The output voltage can be set to a value from 1.0V to 5.0V using external resistors.

They have a fixed internal soft start time which is 1.0ms(TYP.), additionally the time can be extended by using an external resistor and capacitor.The output state can be monitored using the power good function. Over current protection. short-circuit protection and thermal shutdown are embedded and they secure a safety operation even with a short-circuit.

The XDL603 series employ the wettable flank plated packaging. This provides a visual indicator of solderability and lowers the inspection time.

Typical Application Circuit


Input Voltage Range 3.0V ~ 18.0V (Absolute Max 20V)
Output Voltage Range 1.0V ~ 5.0V
FB Voltage 0.75V ± 1.5%
Oscillation Frequency 2.2MHz
Control Methods PWM Control
Efficiency 81%@12V→5V, 300mA
Function Soft-start External Settings
Power Good
Protection Function Over Current Protection
- Automatic recovery (B Type)
-Integral Latch (A Type)
Thermal Shutdown
Output Capacitor Ceramic Capacitor
Operating Ambient Temperature -40℃ ~ 105℃
Environmentally Friendly EU RoHS Compliant, Pb Free


Package DFN3625-11B Number of Pins 11
Pcs/Reel 2,000 Package Size(mm) 2.5 x 3.6 x 1.6


Technical Document