XC9220/XC9221 Series
ETR0511-012
16V Input Voltage, Step-Down DC/DC Controller ICs.
■GENERAL DESCRIPTION
The XC9220/XC9221 series is a group of multi-purpose step-down DC/DC controller ICs. The ICs enable a high efficiency,
stable power supply with an output current up to 3A to be configured using only a transistor, a coil, a diode, and two capacitors
connected externally. Low ESR capacitors such as a ceramic capacitor can be used as an output capacitor.
The XC9220/XC9221 series has a 0.9V (±1.5%) reference voltage, and using externally connected resistors, the output
voltage can be set freely. With an internal switching frequency of 300kHz and 500kHz 1.0MHz, small external components
can also be used. The XC9220 series is PWM control, and the XC9221 series is PWM/PFM mode, which automatically
switches from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of load conditions.
As for the soft-start time, the XC9220/XC9221A and C series is internally set to 4msec and the XC9220/XC9221B and D
series can be externally set-up. With the built-in UVLO (Under Voltage Lock Out) function, the external P-channel driver
transistor is forced OFF when input voltage becomes 2.3V or lower.
■APPLICATIONS
■FEATURES
●Set top boxes
Operating Voltage Range
: 2.8V ~ 16.0V
Output Voltage Externally Set Range : 1.2V or more
(VFB=0.9V+1.5%)
Output Current
: Less than 3.0A
Oscillation Frequency
: 300kHz, 500kHz, and 1.0MHz
Control Methods
: PWM control (XC9220)
PWM/PFM automatic switching
(XC9221)
Soft-Start Function
: 4ms, internally set
●Digital TVs
●DVD / HDD recorders
●Smart phones / Mobile phones
●Note PCs / Tablet PCs
(XC9220/XC9221A, 500kHz)
Externally set (XC9220/XC9221B)
: Integral protection (1.0 ms)
Protection Circuits
(XC9220/XC9221 Aand B series)
Short-circuit protection
Low ESR
Capacitor Compatible
: Ceramic capacitor
Operating Ambient Temperature : - 40℃~ + 85℃
Packages
: SOT-25
USP-6C
Environmentally Friendly
: EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
CHARACTERISTICS
V IN
●Efficiency vs. Output Current
XC9221A095MR (VOUT=3.3V, FOSC=500kHz)
C IN
L
4
EXT
FB
3
SBD
CFB
RS ENS E
( f or ceramic CL )
R FB1
CL
R FB2
90
VOUT
VIN=5.0V
80
Efficiency EFFI (%)
GND
CIN=47μF (OS-Con), CL=47μF (OS-Con),
L=10μH (CDRH8D43, SUMIDA)
PchMOSFET: CPH3308 (SANYO), CDD=1.0μF (ceramic), RIN=10Ω
100
Pch
MOSFET
5
CE
2
V IN
1
CE
70
VIN=16.0V
60
VIN=12.0V
50
40
30
20
* RSENSE : Tantalum and electrolytic capacitors can be used, in w hich case,
RSENSE becomes unnecessary.
10
0
0.1
1
10
100
1000
10000
Output Current IOUT (mA)
1/22
