XCL230/XCL231 Series
36V, 600mA Inductor Built-in Step-down “micro DC/DC” Converter
■GENERAL DESCRIPTION
ETR28019-002
The XCL230/XCL231 Series is a small (3.0mm×3.0mm, h=1.7mm) 36V, 600mA step-down DC/DC converter with an integrated
control IC and coil. Integrating the coil makes for easier circuit board layout and minimizes malfunction and noise from the
component and wiring layout.
The input voltage range is 3.0 to 36V, the switching frequency is 1.2MHz, and a synchronous rectification circuit is used to achieve
a stable power supply at high efficiency. The XCL230 Series fixes the operation frequency using PWM control to suppress output
ripple voltage.
The XCL231 Series automatically switches between PWM and PFM control to reduce loss by lowering the operation frequency
during low loads to achieve high efficiency across the entire range from low to high loads.
A 0.75V standard voltage supply is built in, and the output voltage can be set to 1.0V to 5.0V using an external resistance.
The soft start time is internally set to 2.0ms, and a time that is longer than the internal soft-start can be freely set depending on the
resistance and capacity connected to the EN/SS pin.
An overcurrent protection function and thermal shutdown function are built in as protective functions to ensure safe use in the
event of a short circuit.
■FEATURES
Input Voltage Range
Output Voltage Range
FB Voltage
■APPLICATIONS
● Electricity Meters
● Gas Detectors
:
:
:
:
:
:
:
:
:
3.0V ~ 36V (Absolute Max 40V)
1.0V ~ 5.0V
0.75V ± 1.5%
● Various Sensors
Output Current
600mA
● Industrial Equipment
● Home Appliances
Oscillation Frequency
Efficiency
1.2MHz
86%(VIN=12V,VOUT=5V, IOUT=300mA)
PWM control (XCL230)
PWM/PFM Auto (XCL231)
Soft-start External settings
Control Methods
Function
Power good
Over Current Protection
(Automatic recovery)
Thermal Shutdown
Protection Circuits
:
Output Capacitor
Operating Ambient Temperature
Packages
:
:
:
:
Ceramic Capacitor
-40℃ ~ 105℃
DFN3030-10B
Environmentally Friendly
EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
■TYPICAL APPLICATION CIRCUIT
CHARACTERISTICS
XCL230/XCL231
VIN=VEN/SS=12V, VOUT=5.0V
C
IN1=4.7μF(UMK212BBJ475KG),
C
IN2=0.1μF(UMK107BJ104MAHT)
100
90
80
70
60
50
40
30
20
10
0
RPG
CL=22μF(TMK212BBJ226MG)
Lx
L1
PG
PG
L2
VEN/SS
EN/SS
VOUT
VIN
CFB
VIN
CL
RFB1
FB
CIN1
CIN2
GND
RFB2
XCL230
XCL231
0.1
1
10
100
1000
Output current : IOUT [mA]
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