Recommended

XCL219 Series

1.0A Inductor Built-in Step-Down “micro DC/DC” Converters

The XCL219 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.0mm×2.5mm, h=1.0mm). An internal coil simplifies the circuit and enables minimization of noise and other operational trouble due to the circuit wiring. A wide operating voltage range of 2.5V to 5.5V enables support for applications that require an internally fixed output voltage (0.8V to 3.6V). The XCL219 series uses synchronous rectification at an operating frequency of 3.0MHz. The XCL219 series uses HiSAT-COT(*) synchronous rectification.

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 or lower. When CE=Low, 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. The power consumption will be less than 1.0μA.

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

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Jul 1, 2015
Product News
Smallest size in the world! Step-down "micro DC/DC" converters with1.0A output current and integrated coil

Typical Application Circuit

Features

Input Voltage Range 2.5V~5.5V
Output Voltage 0.8V~3.6V(±2.0%)
Oscillation Frequency 3.0MHz
Output Current 1.0A
Efficiency 93%(VIN=5.0V,VOUT=3.3V/300mA)
Control Methods HiSAT-COT Control
100% Duty cycle
PWM
Protection Circuits Thermal Shut Down
Current Limit Circuit (Drop)
Short Circuit Protection
Functions Soft-Start
UVLO
CL Discharge
Capacitor Low ESR Ceramic
Operating Ambient Temperature -40℃~+105℃
Environmentally Friendly EU RoHS compliant, Pb free

Packages

DATA SHEET

Technical Document

Quality Reports

FAQ

QuestionWhat is the soft-start function?
Answer

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

QuestionHow does the CL discharge function work?
Answer

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?
Answer

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

QuestionWhat does the FB product mean?
Answer

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?
Answer

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.

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Input Voltage:2.5V~5.5V
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