XCL213 Series

1.5A Inductor Built-in Step-Down “micro DC/DC” Converters

The XCL213 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mm×3.2mm, h=1.0mm). A 1.5 A (max.) power circuit can be created by simply adding two ceramic capacitors to the external components. Because the coil is incorporated in the IC, the board layout is easier to design and malfunctioning and noise caused by component placement and wiring can be minimized. A wide operating voltage range of 2.7V to 5.5V enables support for applications that require an internally fixed output voltage (0.8V to 3.6V). The XCL213 series uses synchronous rectification at an operating frequency of 3MHz. The operation mode is “HiSAT-COT(*) control”, which has excellent transient response characteristics. “PWM control” or “PWM/PFM auto switching control” can be selected as needed for the application. ”PWM control” enables reduction of the output ripple voltage. “PWM/PFM auto switching control” achieves high efficiency across the entire load range, from light loads to heavy loads.

The series have a high speed soft-start as fast as 0.3ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.0V(TYP.) or lower. The integrated CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and VSS pins.

(*) HiSAT-COT is an original Torex term for High Speed Transient Response.

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Jul 31, 2013
Product News
1.5A Step-Down "micro DC/DC" Converters with Integrated Coil XCL213/XCL214 Series

Typical Application Circuit


Input Voltage 2.7V~5.5V
Output Voltage 0.8V~3.6V
Control Methods HiSAT-COT Control
100% Duty cycle
Protection Circuits Thermal Shut Down
Current Limit Circuit (Drop)
Short Circuit Protection
Functions Soft-Start
CL Discharge
Capacitor Low ESR Ceramic
Environmentally Friendly EU RoHS compliant, Pb free



Technical Document

Quality Reports


QuestionWhat is the soft-start function?

The function to soften the rise to prevent the inrush current.

QuestionHow does the CL discharge function work?

The function rapidly releases the charge remained in the CL capacitor to make the VOUT pin voltage zero. The VOUT pin voltage does not reach zero immediately after being turned off by the CE function due to the charge remained in the connected CL capacitor. While the charge in the CL capacitor is gradually reaching zero, the LSI continues operating and does not work with the CE pin signal, which may cause a malfunction. This is why the discharge is required when turning off the CE pin. A larger capacitance of the capacitor needs longer time to be discharged.

QuestionWhat does CL mean?

Load capacitor. Other companies often refer to it as COUT.

QuestionWhat does the FB product mean?

An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2

QuestionHow does UVLO (under voltage lockout) work?

This circuit forcibly turns off the driver transistor when VIN drops below the UVLO voltage. If the input voltage recovers to the value which is equal to the specified value or more, UVLO will be released to resume the switching operation. It is resumed by the soft-start function. The paused state by UVLO is not the shutdown. The pulse output is stopped, but the internal circuit is operating.