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0.5A Inductor Built-in Step-Down “micro DC/DC” Converters

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GreenOperationCompatible

ETR28008-001

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GENERAL DESCRIPTION

The XCL221/XCL222 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 XCL221/XCL222 series uses synchronous

HiSAT-COT+PWM control (XCL221) or HiSAT-COT+automatic PWM/PFM switching control (XCL222) can be selected.

The series have a high speed soft-start as fast as 0.25ms (TYP.) 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.

1.0μA.

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APPLICATIONS

●Wearable Device

●Bluetooth Module

●SSD(Solid State Drive)

●Mobile phone

●Digital still camera

●Portable game devices

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TYPICAL PERFORMANCE

CHARACTERISTICS

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TYPICAL APPLICATION CIRCUIT

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FEATURES

Input Voltage

: 2.5V～5.5V

Output Voltage

: 0.8V～3.6V(±2.0%)

Oscillation Frequency

: 1.2MHz

Output Current

: 500mA

Efficiency

Control Methods

: HiSAT-COT

100% Duty Cycle

PWM (XCL221)

PWM/PFM (XCL222)

Circuit Protection

: Thermal Shut Down

Current Limit Circuit (Drop)

Short Circuit Protection (Latch)

Functions

: Soft-start Circuit Built-in

UVLO

Output Capacitor

: Low ESR Ceramic Capacitor

Operating Ambient Temperature : -40℃～+105℃

Package

: CL-2025-02

Environmental Friendly

: EU RoHS Compliant, Pb Free

0.5A

4.7μF

10μF

7

8

1

2

3

4

5

6

PGND

Lx

CE

AGND