XC9220/XC9221
Series
16V Input Voltage, Step-Down DC/DC Controller ICs.
ETR0511_007
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 U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver
transistor is forced OFF when input voltage becomes 2.3V or lower.
■GENERAL
DESCRIPTION
■APPLICATIONS
●Set
top boxes
●Digital
TVs
●DVD/HDD
recorders
●Portable
information terminals
●Notebook
computers
■FEATURES
Operating Voltage Range
: 2.8V ~ 16.0V
Output Voltage Range
: 1.2V or more
Output Voltage Externally Set
: 0.9V (accuracy +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
(XC9220/XC9221A, 500kHz)
Externally set (XC9220/XC9221B)
: Integral protection (1.0 ms)
(XC9220/XC9221 Aand B series)
Short-circuit protection
Low ESR
Capacitor Compatible
Packages
: Ceramic capacitor
: SOT-25
USP-6C
Protection Circuits
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
V
IN
●Efficiency
vs. Output Current
C
IN
XC9221A095MR (VOUT=3.3V, FOSC=500kHz)
CIN=47μF (OS-Con), CL=47μF (OS-Con),
L=10μH (CDRH8D43, SUMIDA)
PchMOSFET: CPH3308 (SANYO), CDD=1.0μF (ceramic), RIN=10Ω
100
CE
1
2
3
SBD
Efficiency
EFFI
(%)
* RSENSE : Tantalum and electrolytic capacitors can be used, in w hich case,
RSENSE becomes unnecessary.
CE
GND
FB
V
IN
EXT
Pch
MOSFET
L
RS ENS E
( f or ceramic CL )
V
OUT
5
4
90
80
70
60
50
40
30
20
10
0
0.1
VIN=5.0V
C
FB
R
FB1
CL
R
FB2
VIN=16.0V
VIN=12.0V
1
10
100
1000
10000
Output Current IOUT (mA)
1/22
XC9220/XC9221
Series
■PIN
CONFIGURATION
V
IN
5
EXT/
4
1
2
3
* The dissipation pad for the USP-6C package
(preliminary) should be solder-plated in
recommended mount pattern and metal
masking so as to enhance mounting strength
and heat release. If the pad needs to be
connected to other pins, it should be
connected to the V
SS
(No.5) pin.
CE/C
SS
V
SS
FB
USP-6C
(BOTTOM VIEW)
SOT-25
(TOP VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
USP-6C
1
2
3
4
-
5
6
5
4
3
2
1
PIN NAME
CE/C
SS
V
SS
FB
EXT/
NC
V
IN
FUNCTION
Chip Enable / Soft-Start
Ground
Output Voltage Sense
External Transistor Drive
No Connection
Power Supply
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9220
123456:
PWM control
XC9221
123456
: PWM/PFM automatic switching control
DESIGNATOR
DESCRIPTION
Type of DC/DC Controller
ICs
SYMBOL
A
B
C
D
DESCRIPTION
: Soft-start internally set with integral protection function
: Soft-start externally set with integral protection function
: Soft-start internally set without integral protection function
: Soft-start externally set without integral protection function
: FB Voltage (Fixed)
: 300kHz
: 500kHz
: 1.0MHz
: SOT-25
: USP-6C
: Embossed tape, standard feed
: Embossed tape, reverse feed
1
23
4
5
6
Output Voltage
09
3
Oscillation Frequency
5
A
M
E
R
L
Package
Device Orientation
2/22
XC9220/XC9221
Series
■BLOCK
DIAGRAMS
●XC9220/21A
and C series
●
XC9220/21B and D series
■
ABSOLUTE MAXIMUM RATINGS
Ta = 25
O
C
PARAMETER
V
IN
Pin Voltage
FB Pin Voltage
CE/C
SS
Pin Voltage
EXT/ Pin Voltage
EXT/ Pin Current
Power Dissipation
SOT-25
USP-6C
SYMBOL
V
IN
V
FB
CE
V
EXT
I
EXT
Pd
Topr
Tstg
RATINGS
- 0.3 ~ + 18.0
- 0.3 ~ V
IN
+ 0.3
- 0.3 ~ V
IN
+ 0.3
- 0.3 ~ V
IN
+ 0.3
+ 100
250
100
- 40 ~ + 85
- 55 ~ +125
UNITS
V
V
V
V
mA
mW
O
O
Operating Temperature Range
Storage Temperature Range
C
C
3/22
XC9220/XC9221
Series
■ELECTRICAL
CHARACTERISTICS
XC9220/XC9221 A and C series
PARAMETER
FB Voltage
Input Voltage Range
U.V.L.O. Voltage
(Minimum Operating Voltage)
Supply Current 2
Stand-by Current
Oscillation Frequency
Maximum Duty Ratio
PFM Duty Ratio
EXT/ High On Resistance
EXT/ Low On Resistance
Integral Protection Time
(*2)
Short-Circuit Protection
Soft-Start Time
Efficiency (*1)
FB Voltage
Temperature Characteristics
CE “High” Level Voltage
CE “Low” Level Voltage
CE “High” Level Current
CE “Low” Level Current
FB “High” Level Current
FB “Low” Level Current
Unless otherwise stated, V
IN
=5.0V
NOTE:
*1: EFFI = { (output voltage) x (output current)} / { (input voltage) x (input current) } x 100
*2: No Integral protection function is available with the XC9220/9221 C series.
** Refer to the CHARACTERISTICS CHART BY OSCILLATION FREQUENCY.
Ta = 25
O
C
CONDITIONS
MIN.
0.8865
2.8
1.9
V
IN
=5.0V, FB=1.0V
-
Connected to external
components
No load (XC9221 series only)
100
15
6
6
TYP.
MAX.
UNIT.
V
V
V
μA
μA
kHz
-
35
16
20
%
%
Ω
Ω
ms
0.7
-
-
-
0.3
0.1
0.1
0.1
0.1
V
ms
%
ppm
O
/ C
V
V
μA
μA
μA
μA
CIRCUIT
2
-
3
1
1
3
2
3
4
4
2
2
2
3
2
2
3
1
1
4
4
0.9000 0.9135
-
16.0
2.3
**
0.1
**
-
25
10
12
**
-
-
-
1.2
-
- 0.1
- 0.1
- 0.1
- 0.1
-
**
92
+100
-
-
-
-
-
-
2.7
SYMBOL
V
FB
V
IN
V
UVLO
I
DD2
I
STB
F
OSC
MAXDTY
PFMDTY
REXTBH
REXTBL
T
PRO
V
SHORT
T
SS
EFFI
V
FB
Topr V
FB
V
CEH
V
CEL
I
CEH
I
CEL
I
FBH
I
FBL
1.0
(XC9220/9221 A series)
V
IN
=CE=16V
V
IN
=16V, CE=0V
V
IN
=FB=16V
V
IN
=16V, FB=0V
4/22
XC9220/XC9221
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XC9220/XC9221 B and D series
PARAMETER
FB Voltage
Input Voltage Range
U.V.L.O. Voltage
(Minimum Operating Voltage)
Supply Current 2
Stand-by Current
Oscillation Frequency
Maximum Duty Ratio
PFM Duty Ratio
EXT/ High On Resistance
EXT/ Low On Resistance
Integral Protection Time
(*4)
Short-Circuit Protection
Soft-Start Time
Internal Soft-Start Time (*1)
Efficiency (*2)
FB Voltage
Temperature Characteristics
CE “High” Level Voltage
(*3)
CE “Low” Level Voltage
CE “High” Level Current
CE “Low” Level Current
FB “High” Level Current
FB “Low” Level Current
SYMBOL
V
FB
V
IN
V
UVLO
I
DD2
I
STB
F
OSC
MAXDTY
PFMDTY
REXTBH
REXTBL
T
PRO
V
SHORT
T
SS
T
SS_IN
EFFI
V
FB
Topr V
FB
V
CEH
V
CEL
I
CEH
I
CEL
I
FBH
I
FBL
V
IN
=5.0V, FB=1.0V
-
Connected to external
components
No load (XC9221 series only)
100
15
6
6
CONDITIONS
MIN.
0.8865
2.8
1.9
TYP.
MAX.
Ta = 25
O
C
UNIT.
V
V
V
μA
μA
kHz
-
35
16
20
%
%
Ω
Ω
ms
0.7
20.0
-
-
-
0.3
0.1
0.1
0.1
0.1
V
ms
ms
%
ppm
/
O
C
V
V
μA
μA
μA
μA
CIRCUIT
2
-
3
1
1
3
2
3
4
4
2
2
5
2
3
2
2
2
1
1
4
4
0.9000 0.9135
-
16.0
2.3
**
0.1
**
-
25
10
12
**
2.7
1.0
(XC9220/9221 B series)
-
5.0
-
-
2.6
-
- 0.1
- 0.1
- 0.1
- 0.1
Connected to R
SS
and C
SS
CE=V
IN
-
10.0
**
92
+100
-
-
-
-
-
-
V
IN
=CE=16V
V
IN
=16V, CE=0V
V
IN
=FB=16V
V
IN
=16V, FB=0V
Unless otherwise stated, V
IN
=5.0V
External components: C
SS
=0.1μF, R
SS
=200kΩ
NOTE:
*1: Internal soft-start time: In case where the U.V.L.O. function operates temporarily due to the power cutoff etc. when an external C
SS
is
charged (V
CE
>2.6V), the IC restarts operation by the internal soft-start time. Minimum value of soft-start time set externally is equal to the
internal soft-start time.
*2: EFFI={ (output voltage) x (output current) } / { (input voltage) x (input current) } x 100
*3: The integral latch and short-circuit protection do not function when the CE/C
SS
pin voltage become lower than 2.6V while the soft-start time.
*4: No Integral protection function is available with the XC9220/XC9221 D series.
** Refer to the CHARACTERISTICS CHART BY OSCILLATION FREQUENCY.
■CHARACTERISTICS
CHART BY OSCILLATION FREQUECY
PARAMETER
Supply Voltage 2
Oscillation Frequency
Integral Protection Time
Soft-Start Time
SYMBOL
I
DD2
FOSC
TPRO
T
SS
MIN.
-
255
0.5
2
300kHz
TYP.
25
300
1.0
4
MAX.
50
345
2.0
8
MIN.
-
425
0.5
2
500kHz
TYP.
25
500
1.0
4
MAX.
50
575
2.0
8
MIN.
-
850
0.25
1
1.0MHz
TYP.
40
1000
0.50
2
MAX.
80
1150
1.00
4
5/22
