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BLOCK DIAGRAM

* The XCL221 offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at “PWM” internally.

The XCL222 control scheme is a fixed PWM/PFM automatic switching, a Control Logic of PWM/PFM Selector is fixed at “PWM/PFM automatic

switching” internally.

Diodes inside the circuit are an ESD protection diode and a parasitic diode.

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PRODUCT CLASSIFICATION

●

Ordering Information

XCL221①②③④⑤⑥-⑦

PWM

XCL222①②③④⑤⑥-⑦

PWM/PFM Automatic switching control

DESIGNATOR

ITEM

SYMBOL

DESCRIPTION

①

Type

B

Refer to Selection Guide

②③

Output Voltage

08～36

Output Voltage options

e.g.)1.2V → ②=1, ③=2

1.25V → ②=1, ③=C

0.05V Increments:

0.05=A,0.15=B,0.25=C,0.35=D,0.45=E,0.55=F,0.65=H,

0.75=K,0.85=L,0.95=M

④

Oscillation Frequency

1

1.2MHz

⑤⑥

Package (Order Unit)

ER-G

CL-2025-02 (3,000pcs/Reel)

●Selection Guide

TYPE

OUTPUT

VOLTAGE

DISCHARGE

LATCH or

SHORT

PROTECTION

UVLO

CHIP

ENABLE

CURRENT

LIMIT

SOFT-

START

THERMAL

SHUTDOWN

B

Fixed

Yes

Yes

Yes

Yes

Yes

Fixed

Yes

Lx

Inductor

PGND

L2

L1

CE

Error

Amp.

High Side

Current Limit

Comparator

Phase

Compensation

R2

R1

Synch

Buffer

Drive

Logic

Minimum

On Time

Generator

S

R

Q

PWM/PFM

Selector

Vref with

Soft Start

CE Control Logic,

UVLO

Thermal Shutdown

Short

Protection

AGND