XCL221/XCL222
Series
0.5A Inductor Built-in Step-Down “micro DC/DC” Converters
ETR28008-001
☆GreenOperationCompatible
■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 HiSAT-COT+automatic PWM/PFM switching control (XCL222) can be selected.
The series have a high speed soft-start as fast as 0.25ms (TYP.) in typical for quick turn-on. With the built-in UVLO (Under
Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.0V or lower.
When CE=Low, the integrated C
L
discharge function which enables the electric charge at the output capacitor C
L
to be
discharged via the internal discharge switch located between the L
X
and PGND pins. The power consumption will be less than
1.0μA.
(*)
HiSAT-COT is an original Torex term for High Speed Transient Response.
■APPLICATIONS
●Wearable
Device
●Bluetooth
Module
●SSD(Solid
State Drive)
●Mobile
phone
●Digital
still camera
●Portable
game devices
■FEATURES
Input Voltage
Output Voltage
Oscillation Frequency
Output Current
Efficiency
Control Methods
: 2.5V½5.5V
: 0.8V½3.6V(±2.0%)
: 1.2MHz
: 500mA
: 93% (V
IN
=5.0V, V
OUT
=3.3V/200mA)
: HiSAT-COT
100% Duty Cycle
PWM (XCL221)
PWM/PFM (XCL222)
: Thermal Shut Down
Current Limit Circuit (Drop)
Short Circuit Protection (Latch)
: Soft-start Circuit Built-in
UVLO
C
L
Discharge
: Low ESR Ceramic Capacitor
Circuit Protection
Functions
Output Capacitor
Operating Ambient Temperature : -40℃½+105℃
Package
: CL-2025-02
Environmental Friendly
: EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
■
TYPICAL PERFORMANCE
CHARACTERISTICS
XCL222B181ER-G (V
OUT
=1.8V)
7
1 Lx
2 AGND
0.5A
C
L
10μF
V
IN
6
PGND 5
CE 4
8
C
IN
4.7μF
3 V
OUT
1/20
XCL221/XCL222
Series
■BLOCK
DIAGRAM
L2
Inductor
L1
V
OUT
R1
C
FB
Phase
Compensation
R2
Error
Amp.
Comparator
Short
Protection
High Side
Current Limit
V
IN
AGND
S
Q
Vref with
Soft Start
R
Logic
Synch
Buffer
Drive
Lx
CE
CE Control Logic,
UVLO
Thermal Shutdown
Minimum
On Time
Generator
V
IN
V
OUT
PWM/PFM
Selector
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 fixed at “PWM/PFM automatic
switching” internally.
Diodes inside the circuit are an ESD protection diode and a parasitic diode.
■PRODUCT
CLASSIFICATION
●Ordering
Information
XCL221①②③④⑤⑥-⑦
XCL222①②③④⑤⑥-⑦
DESIGNATOR
①
PWM
PWM/PFM Automatic switching control
ITEM
SYMBOL
Type
B
DESCRIPTION
Refer to Selection Guide
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
1.2MHz
CL-2025-02 (3,000pcs/Reel)
②③
Output Voltage
08½36
④
⑤⑥-⑦
(*1)
(*1)
Oscillation Frequency
Package (Order Unit)
1
ER-G
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
●Selection
Guide
TYPE
B
OUTPUT
VOLTAGE
Fixed
C
L
AUTO-
DISCHARGE
Yes
LATCH or
SHORT
PROTECTION
Yes
UVLO
Yes
CHIP
ENABLE
Yes
CURRENT
LIMIT
Yes
SOFT-
START
Fixed
THERMAL
SHUTDOWN
Yes
2/20
XCL221/XCL222
Series
■PIN
CONFIGURATION
* It should be connected the pin No.2 and 5 to the GND pin.
* If the dissipation pad needs to be connected to other pins, it should
be connected to the GND pin.
* Please refer to pattern layout page for the connecting to PCB.
BOTTOM VIEW
■PIN
ASSIGNMENT
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
Lx
AGND
V
OUT
CE
PGND
V
IN
L1
L2
FUNCTIONS
Switching Output
Analog Ground
Fixed Output Voltage PIN
Chip Enable
Power Ground
Power Input
Inductor Electrodes
Inductor Electrodes
■FUNCTION
TABLE
CE PIN Function
PIN NAME
CE
SIGNAL
Low
High
STATUS
Stand-by
Active
* Please do not leave the CE pin open.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
IN
Pin Voltage
L
X
Pin Voltage
V
OUT
Pin Voltage
CE Pin Voltage
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
IN
V
Lx
V
out
V
CE
Pd
Topr
T
stg
RATINGS
-0.3 ~ + 6.2
- 0.3 ~ V
IN
+ 0.3 or + 6.2
(*1)
- 0.3 ~ V
IN
+ 0.3 or + 4.0
(*2)
- 0.3 ~ + 6.2
1000
(*3)
- 40 ~ + 105
- 55 ~ + 125
UNITS
V
V
V
V
mW
℃
℃
All voltages are described based on the GND (AGND and PGND) pin.
(*1)
(*2)
(*3)
The maximum value should be either V
IN
+0.3 or +6.2 in the lowest voltage
The maximum value should be either V
IN
+0.3 or +4.0 in the lowest voltage
The power dissipation figure shown is PCB mounted (40mm×40mm, t=1.6mm, Glass Epoxy FR-4).
Please refer to page 11 for details.
3/20
XCL221/XCL222
Series
■ELECTRICAL
CHARACTERISTICS
●XCL221Bxx1ER-G/XCL222Bxx1ER-G
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
(*2)
Quiescent Current
(XCL222)
Quiescent Current
(XCL221)
Stand-by Current
Minimum ON time
(*2)
Thermal Shutdown
Thermal shutdown
Hysteresis
LxSW ”H” ON
Resistance
LxSW ”L” ON
Resistance
(*4)
LxSW ”H” Leakage
Current
LxSW ”L” Leakage
Current
Current Limit
(*5)
Output Voltage
Temperature
Characteristics
CE”H” Voltage
CE”L” Voltage
CE”H” Current
CE”L” Current
Soft-start Time
Short Protection
Threshold Voltage
C
L
Discharge
Inductance
Inductor Rated Current
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
q
I
q
I
STB
t
ONmin
T
TSD
T
HYS
R
LXH
R
LXL
I
LeakH
I
LeakL
I
LIMH
∆V
OUT
/
(V
OUT
・∆topr)
V
CEH
V
CEL
I
CEH
I
CEL
t
SS
V
OUT
=0.6V, I
LX
=100mA
(*3)
V
OUT
=V
OUT(T)
× 1.1V, I
LX
=100mA
(*3)
V
IN
=5.5V, V
CE
=0V, V
OUT
=0V, V
LX
=5.5V
V
IN
=5.5V, V
CE
=0V, V
OUT
=0V, V
LX
=0V
V
OUT
=0.6V, I
Lx
until Lx pin oscillates
I
OUT
=30mA
-40℃≦Topr≦105℃
V
OUT
=0.6V, Applied voltage to V
CE,
Voltage changes Lx to “H” level
(*6)
V
FB
=0.6V, Applied voltage to V
CE,
Voltage changes Lx to “L” level
(*6)
V
IN
=5.5V, V
CE
=5.5V, V
OUT
=0V
V
IN
=5.5V, V
CE
=0V, V
OUT
=0V
V
CE
=0V→5.0V, V
OUT
=V
OUT(T)
V × 0.9
After "H" is fed to CE, the time by
when clocks are generated at Lx pin.
V
SHORT
R
DCHG
L
I
DC
Sweeping V
OUT
, V
OUT
voltage which Lx
becomes “L” level
(*6)
V
CE
=0V, V
OUT
=4.0V
Test Freq.=1MHz
∆T=+40deg
0.17
50
-
-
0.27
210
4.7
700
0.37
300
-
-
V
Ω
μH
mA
③
⑦
-
-
0.10
0.30
0.50
ms
③
When connected to external components,
V
IN
=<C-1>
V
out
=0.6V,
Voltage which Lx pin holding ”L” level
(*6)
V
OUT
=V
OUT(E)
×1.1V
V
OUT
=V
OUT(E)
×1.1V
V
CE
=0V
When connected to external components,
V
IN
=V
CE
=<C-1>, I
OUT
=1mA
I
OUT
=30mA
CONDITIONS
When connected to external conponets,
MIN.
<E-1>
2.5
500
1.35
-
-
-
<E-5>
-
-
-
-
-
-
1.3
-
TYP.
<E-2>
-
-
2.0
15
250
0.0
<E-6>
150
30
0.24
0.16
0.0
0.0
1.5
±100
MAX.
<E-3>
5.5
-
2.48
25
450
1.0
<E-7>
-
-
0.37
0.30
30.0
1.0
2.5
-
UNITS
V
V
mA
V
μA
μA
μA
ns
℃
℃
Ω
Ω
μA
μA
A
ppm/℃
Ta=25℃
CIRCUIT
①
①
①
③
②
②
②
①
①
①
④
④
⑤
⑤
⑥
①
1.4
AGND
-0.1
-0.1
-
-
-
-
V
IN
0.3
0.1
0.1
V
V
μA
μA
③
③
⑤
⑤
Unless otherwise stated, V
IN
=5.0V, V
CE
=5.0V, V
OUT(T)
=Nominal Voltage
NOTE:
(*1)
When the difference between the input and the output is small, 100% duty might come up and internal control circuits keep P-ch driver
turning on even though the output current is not so large.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
(*2)
(*3)
(*4)
(*5)
(*6)
Including UVLO detect voltage, hysteresis operating voltage range for UVLO release voltage.
R
LXH
=(V
IN
- Lx pin measurement voltage) / 100mA, R
LXL
=Lx pin measurement voltage / 100mA
Design value for the XCL222 series
Current limit denotes the level of detection at peak of coil current.
"H"=V
IN
½V
IN
- 1.2V, "L"=- 0.1V½+ 0.1V
4/20
XCL221/XCL222
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
●SPEC
Table (V
OUT
, t
ONmin
)
NOMINAL
OUTPUT
VOLTAGE
V
OUT(T)
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
2.10
2.15
2.20
V
OUT
<E-1>
MIN.
0.784
0.833
0.882
0.931
0.980
1.029
1.078
1.127
1.176
1.225
1.274
1.323
1.372
1.421
1.470
1.519
1.568
1.617
1.666
1.715
1.764
1.813
1.862
1.911
1.960
2.009
2.058
2.107
2.156
<E-2>
TYP.
0.800
0.850
0.900
0.950
1.000
1.050
1.100
1.150
1.200
1.250
1.300
1.350
1.400
1.450
1.500
1.550
1.600
1.650
1.700
1.750
1.800
1.850
1.900
1.950
2.000
2.050
2.100
2.150
2.200
<E-3>
MAX.
0.816
0.867
0.918
0.969
1.020
1.071
1.122
1.173
1.224
1.275
1.326
1.377
1.428
1.479
1.530
1.581
1.632
1.683
1.734
1.785
1.836
1.887
1.938
1.989
2.040
2.091
2.142
2.193
2.244
<C-1>
V
IN
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.58
2.67
2.75
2.83
2.92
3.00
3.08
3.17
3.25
3.33
3.42
3.50
3.58
3.67
t
ONmin
f
OSC
=1.2MHz
<E-5> <E-6> <E-7>
MIN.
TYP.
MAX.
187
198
210
222
233
245
257
268
280
292
303
315
327
338
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
267
283
300
317
333
350
367
383
400
417
433
450
467
483
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
347
368
390
412
433
455
477
498
520
542
563
585
607
628
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
NOMINAL
OUTPUT
VOLTAGE
V
OUT(T)
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.60
2.65
2.70
2.75
2.80
2.85
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.60
V
OUT
<E-1>
MIN.
2.205
2.254
2.303
2.352
2.401
2.450
2.499
2.548
2.597
2.646
2.695
2.744
2.793
2.842
2.891
2.940
2.989
3.038
3.087
3.136
3.185
3.234
3.283
3.332
3.381
3.430
3.479
3.528
<E-2>
TYP.
2.250
2.300
2.350
2.400
2.450
2.500
2.550
2.600
2.650
2.700
2.750
2.800
2.850
2.900
2.950
3.000
3.050
3.100
3.150
3.200
3.250
3.300
3.350
3.400
3.450
3.500
3.550
3.600
<E-3>
MAX.
2.295
2.346
2.397
2.448
2.499
2.550
2.601
2.652
2.703
2.754
2.805
2.856
2.907
2.958
3.009
3.060
3.111
3.162
3.213
3.264
3.315
3.366
3.417
3.468
3.519
3.570
3.621
3.672
<C-1>
V
IN
3.75
3.83
3.92
4.00
4.08
4.17
4.25
4.33
4.42
4.50
4.58
4.67
4.75
4.83
4.92
5.00
5.08
5.17
5.25
5.33
5.42
5.50
5.50
5.50
5.50
5.50
5.50
5.50
t
ONmin
f
OSC
=1.2MHz
<E-5> <E-6> <E-7>
MIN.
TYP.
MAX.
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
350
355
361
366
371
377
382
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
508
515
523
530
538
545
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
650
660
670
680
689
699
709
■TYPICAL
CIRCUIT
7
1 Lx
2 AGND
0.5A
C
L
10μF
VALUE
V
IN
6
PGND 5
CE 4
C
IN
4.7μF
PRODUCT NUMBER
LMK105BBJ475MVLF(Taiyo Yuden)
LMK107BJ475KA (TaiyoYuden)
C1608X5R1A475K (TDK)
C2012X7R1A475M(TDK)
LMK105CBJ106MVLF(Taiyo Yuden)
LMK107BBJ106MALT (TaiyoYuden)
C1608X5R1A106K (TDK)
C2012X7R1A106M(TDK)
C
IN
10V/4.7μF
3 V
OUT
8
C
L
10V/10μF
NOTE:
The integrated Inductor can be used only for this
DC/DC converter. Please do not use this inductor for
other reasons.
5/20
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