Document
XCL221/XCL222 Series
ETR28008-002a
HiSAT-COT ® Control 0.5A Inductor Built-in Step-Down “micro DC/DC” Converters
☆Green Operation Compatible
■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 rectification at an operating frequency of 1.2MHz. The XCL221/XCL222 series uses HiSAT-COT (*) synchronous rectification. HiSAT-COT+PWM control (XCL221) or HiSATCOT+automatic PWM/PFM switching control (XCL222) can be selected.
The series have a high speed soft-start as fast as 0.3ms in typical for quick turn-on. With the built-in UVLOfunction, 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 PGND pins. The power consumption will be less than 1.0μA. (*) HiSAT-COT is a proprietary high-speed transient response technology for DC/DC converter which was developed by Torex.
It is Ideal for the LSI's that require high precision and high stability power supply voltage.
■APPLICATIONS
●Wearable Device ●Bluetooth Module ●SSD(Solid State Drive) ●Mobile phone ●Digital still camera ●Portable game devices
■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
: 93% (VIN=5.0V, VOUT=3.3V/200mA) : 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
CL Discharge
Output Capacitor
: Low ESR Ceramic Capacitor
Operating Ambient Temperature : -40℃ ~ 105℃
Package
: CL-2025-02
Environmental Friendly : EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT ■ TYPICAL PERFORMANCE CHARACTERISTICS
XCL222B181ER-G (VOUT=1.8V)
CL
0.5A 10μF
7
1 Lx
VIN 6
2 AGND PGND 5
3 VOUT 8
CE 4
CIN 4.7μF
1/19
XCL221/XCL222 Series
■BLOCK DIAGRAM
L2 Inductor
VOUT AGND
CE
R1
CFB
Phase Compensation
Short Protection
R2
Error Amp.
Comparator
Vref with Soft Start
S Q
R
High Side Current Limit
Logic
Synch Buffer Drive
CE Control Logic, UVLO
Thermal Shutdown
Minimum On Time Generator
VIN VOUT
PWM/PFM Selector
L1
VIN Lx PGND
* 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 .