XCL201/XCL202
Series
Inductor Built-in Step-Down “micro DC/DC” Converters
ETR2802-007
☆GreenOperation
Compatible
■GENERAL
DESCRIPTION
The XCL201/XCL201 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control
IC in one tiny package (2.5mm×2.0mm, h=1.0mm). A stable power supply with an output current of 400mA is configured using
only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of
0.05V. The device is operated by 1.2MHz, and includes 0.42Ω P-channel driver transistor and 0.52Ω N-channel switching
transistor. As for operation mode, the XCL201 series is PWM control, the XCL202 series is automatic PWM/PFM switching
control, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load).
During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μ or less. With the built-in UVLO
A
(Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes 1.4V or lower.
The series provide short-time turn-on by the soft start function internally set in 0.25ms (TYP). The series integrate C
L
auto
discharge function which enables the electric charge stored at the output capacitor C
L
to be discharged via the internal auto-
discharge switch located between the L
X
and V
SS
pins. When the devices enter stand-by mode, output voltage quickly returns
to the V
SS
level as a result of this function.
■APPLICATIONS
●Mobile
phones, Smart phones
●Bluetooth
Headsets
●WiMAX
PDAs, MIDs, UMPCs
●Portable
game consoles
●Digital
cameras, Camcorders
●SSD(Solid
State Drive)
●PND(Portable
Navigation Device)
■FEATURES
Ultra Small
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Output Capacitor
Function
: 2.5mm×2.0mm, h=1.0mm
: 2.0V ~ 6.0V
: 0.8V ~ 4.0V (±2.0%)
: 92%(V
IN
=4.2V,V
OUT
=3.3V)
: 400mA
: 1.2MHz (±15%)
: 100%
: Low ESR Ceramic
: Current Limiter Circuit
(Constant Current & Latching)
Soft-Start Circuit Built-In
C
L
Discharge
Control Methods
: PWM (XCL201)
PWM/PFM Auto (XCL202)
Operating Ambient Temperature : -40℃ ~ +85℃
Environmentally Friendly
: EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
XCL201/XCL202 Series
■
TYPICAL PERFORMANCE
CHARACTERISTICS
XCL201B331BR/XCL202B331BR
100
XCL202(PWM/PFM)
L1
L
X
V
IN
C
IN
4.7μF
80
Efficency:EFFI(%)
60
VIN= 5.5V
C
L
10μF
400mA
Vss
V
OUT
L2
Vss
CE
40
5.0V
XCL201(PWM)
20
4.2V
VOUT=3.3V
(TOP VIEW)
* “L1 and L
X
”, and “L2 and V
OUT
” is connected by wiring.
0
0.01
0.1
1
10
100
1000
Output Current:I
OUT
(mA)
1/22
XCL201/XCL202
Series
■BLOCK
DIAGRAM
●XCL201B
/ XCL202B Series
L2
L1
Current Feedback
Current Limit
PWM
Comparator
Logic
VSHORT
Vref with
Soft Start,
CE
PWM/PFM
Selector
Synch
Buffer
Drive
Inductor
V
OUT
R1
CFB
FB
R2
Phase
Compensation
Error
Amp.
Lx
V
IN
R3
V
SS
UVLO Cmp
Ramp Wave
Generator
OSC
CE/
UVLO
V
SS
R4
CE
Control
Logic
CE
NOTE: The XCL201 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to "L" level inside.
The XCL202 control scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed
to "H" level inside. The diodes placed inside are ESD protection diodes and parasitic diodes.
■PRODUCT
CLASSIFICATION
●
Ordering
Information
XCL201①②③④⑤⑥-⑦
(*1)
Fixed PWM control
XCL202①②③④⑤⑥-⑦
(*1)
PWM / PFM automatic switching control
DESIGNATOR
①
ITEM
Functions selection
SYMBOL
B
DESCRIPTION
C
L
auto discharge, High speed soft-start
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 (3,000pcs/Reel)
CL-2025-02 (3,000pcs/Reel)
②③
Output Voltage
08 ~ 40
④
⑤⑥-⑦
(*1)
(*2)
(*3)
Oscillation Frequency
Package
(Order Unit)
1
BR-G
(*2)
ER-G
(*3)
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
BR-G is storage temperature range "-40℃ ~ + 105℃".
ER-G is storage temperature range "-40℃ ~ + 125℃".
2/22
XCL201/XCL202
Series
■PIN
CONFIGURATION
L1
7
V
IN
6
Vss
5
CE
4
8
L2
1 Lx
2
Vss
3
V
OUT
* It should be connected the V
SS
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
2,5
3
4
6
7
8
PIN NAME
L
x
V
SS
V
OUT
CE
V
IN
L1
L2
FUNCTIONS
Switching Output
Ground
Output Voltage
Chip Enable
Power Input
Inductor Electrodes
■ABSOLUTE
MAXIMUM RATINGS
Ta = 25℃
PARAMETER
V
IN
Pin Voltage
L
X
Pin Voltage
V
OUT
Pin Voltage
CE Pin Voltage
L
X
Pin Current
Power Dissipation
Operating Ambient Temperature
CL-2025
Storage
(*2)
Temperature
CL-2025-02
(*1)
SYMBOL
V
IN
V
LX
V
OUT
V
CE
I
LX
Pd
Topr
Tstg
RATINGS
- 0.3 ~ +6.5
- 0.3 ~ V
IN
+ 0.3
≦
+6.5
- 0.3 ~ +6.5
- 0.3 ~ +6.5
±1500
1000(40mm x 40mm Standard board)
(*1)
- 40~ +85
- 40 ~ +105
- 40 ~ +125
UNITS
V
V
V
V
mA
mW
℃
℃
he power dissipation figure shown is PCB mounted and is for reference only.
The mounting condition is please refer to PACKAGING INFORMATION
Storage temperature, are divided by the product specification of the package.
(*2)
3/22
XCL201/XCL202
Series
■ELECTRICAL
CHARACTERISTICS
XCL201B121BR/XCL202B121BR/XCL201B121ER/XCL202B121ER, V
OUT
=1.2V, f
OSC
=1.2MHz, Ta=25℃
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current (XCL201)
Supply Current (XCL202)
Stand-by Current
Oscillation Frequency
PFM Switching Current
(*11)
PFM Duty Limit
(*11)
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
(*2)
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leakage Current
(*5)
Current Limit
(*9)
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
C
L
Discharge
Inductance Value
Allowed Inductor Current
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD
I
STB
f
OSC
I
PFM
DTY
LIMIT_PFM
MAXDTY
MINDTY
EFFI
R
L½H1
R
L½H2
R
L½L1
R
L½L2
I
LeakH
I
LIM
△V
OUT
/
(V
OUT
・△Topr)
V
CEH
V
CEL
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
R
DCHG
L
I
DC
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V
When connected to external components
(*8)
V
CE
=V
IN
,V
OUT
=0V
Voltage which Lx pin holding “L” level
(*1, *10)
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(T)
×1.1V
V
IN
=5.0V, V
CE
=0V, V
OUT
= V
OUT(T)
×1.1V
When connected to external components,
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V , I
OUT
=100mA
When connected to external components,
V
IN
=V
OUT(T)
+2.0V, V
CE
=V
IN
, I
OUT
=1mA
V
CE
=V
IN
= 2.0V, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (T)
×0.9V
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (T)
×1.1V
When connected to external components,
V
CE
=V
IN
=V
OUT (T)
+1.2V, I
OUT
=100mA
V
IN
=V
CE
=5.0V, V
OUT
=0V,IL
X
=100mA
(*3)
V
IN
=V
CE
=3.6V, V
OUT
=0V,IL
X
=100mA
(*3)
V
IN
=V
CE
=5.0V
(*4)
V
IN
=V
CE
=3.6V
(*4)
V
IN
=V
OUT
=5.0V, V
CE
=0V, L
X
=0V
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (T)
×0.9V
(*7)
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
CE
,
Voltage changes Lx to “H” level
(*10)
V
OUT
=0V, Applied voltage to V
CE
,
Voltage changes Lx to “L” level
(*10)
V
IN
=V
CE
=5.0V, V
OUT
=0V
V
IN
=5.0V, V
CE
=0V, V
OUT
=0V
When connected to external components,
V
CE
=0V→V
IN
, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=0.8×V
OUT(T)
Short Lx at 1Ω resistance
(*6)
Sweeping V
OUT
, V
IN
=V
CE
=5.0V, Short Lx at
1Ω resistance, V
OUT
voltage which Lx becomes “L”
level within 1ms
V
IN
=5.0V, L
X
=5.0V, V
CE
=0V, V
OUT
=open
Test frequency=1MHz
ΔT=40℃
CONDITIONS
When connected to external components,
V
IN
=V
CE
=5.0V, I
OUT
=30mA
MIN.
1.176
2.0
400
1.00
-
-
-
1020
140
-
100
-
-
-
-
-
-
-
700
-
0.65
V
SS
- 0.1
- 0.1
-
1.0
0.450
200
-
-
TYP.
1.200
-
-
1.40
22
15
0
1200
180
200
-
-
86
0.35
0.42
0.45
0.52
0.01
800
±100
-
-
-
-
0.25
-
0.600
300
4.7
600
MAX.
1.224
6.0
-
1.78
50
33
1.0
1380
240
300
-
0
-
0.55
0.67
0.65
0.77
1.0
1000
-
6.0
0.25
0.1
0.1
0.40
20
0.750
450
-
-
UNITS CIRCUIT
V
V
mA
V
μ
A
μ
A
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μ
A
mA
ppm/
℃
V
V
μ
A
μ
A
ms
ms
V
Ω
μ
H
mA
①
①
①
②
②
③
①
⑩
①
③
③
①
④
④
-
-
⑨
⑥
①
③
③
⑤
⑤
①
⑦
⑦
⑧
-
-
Test conditions: Unless otherwise stated, V
IN
=5.0V, V
OUT(T)
=Nominal Voltage
NOTE:
(*1)
Including hysteresis operating voltage range.
(*2)
EFFI= { ( output voltage×output current ) / ( input voltage×input current) }×100
(*3)
ON resistance (Ω)=(V
IN
- Lx pin measurement voltage) / 100mA
(*4)
Design value
(*5)
When temperature is high, a current of approximately 10μA (maximum) may leak.
(*6)
Time until it short-circuits V
OUT
with GND via 1Ω of resistor from an operational state and is set to Lx=0V from current limit pulse generating.
(*7)
When V
IN
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
(*8)
When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
(*9)
Current limit denotes the level of detection at peak of coil current.
(*10)
“H”=V
IN
~V
IN
-1.2V, “L”=+0.1V~-0.1V
(*11)
I
PFM
and DTY
LIMIT_PFM
are defined only for the XCL202 series which have PFM control function. (Not for the XCL201 series)
4/22
XCL201/XCL202
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XCL201B181BR/XCL202B181BR/XCL201B181ER/XCL202B181ER ,V
OUT
=1.8V, f
OSC
=1.2MHz, Ta=25℃
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current (XCL201)
Supply Current (XCL202)
Stand-by Current
Oscillation Frequency
PFM Switching Current
(*11)
PFM Duty Limit
(*11)
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
(*2)
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD
I
STB
f
OSC
I
PFM
DTY
LIMIT_PFM
MAXDTY
MINDTY
EFFI
V
IN
=V
OUT(E)
+2.0V, V
CE
=1.0V
When connected to external components
(*8)
V
CE
=V
IN
,V
OUT
=0V
Voltage which Lx pin holding “L” level
(*1, *10)
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(T)
×1.1V
V
IN
=5.0V, V
CE
=0V, V
OUT
=V
OUT(T)
×1.1V
When connected to external components,
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V , I
OUT
=100mA
When connected to external components,
V
IN
=V
OUT(T)
+2.0V, V
CE
=V
IN
, I
OUT
=1mA
V
CE
=V
IN
=V
OUT(T)
+0.5V, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (T)
×0.9V
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (T)
×1.1V
When connected to external components,
V
CE
=V
IN
=V
OUT (T)
+1.2V, I
OUT
=100mA
V
IN
=V
CE
=5.0V, V
OUT
=0V, IL
X
=100mA
(*3)
V
IN
=V
CE
=3.6V, V
OUT
=0V, IL
X
=100mA
(*3)
V
IN
=V
CE
=5.0V
(*4)
V
IN
=V
CE
=3.6V
(*4)
V
IN
=V
OUT
=5.0V, V
CE
=0V, L
X
=0V
V
IN
=V
CE
= 5.0V, V
OUT
=V
OUT (T)
×0.9V
(*7)
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
CE
,
Voltage changes Lx to “H” level
(*10)
V
OUT
=0V, Applied voltage to V
CE
,
Voltage changes Lx to “L” level
(*10)
V
IN
=V
CE
=5.0V, V
OUT
=0V
V
IN
=5.0V, V
CE
=0V, V
OUT
=0V
When connected to external components,
V
CE
=0V→V
IN
, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=0.8×V
OUT(T)
Short Lx at 1Ω resistance
(*6)
Sweeping V
OUT
, V
IN
=V
CE
=5.0V, Short Lx at
1Ω resistance, V
OUT
voltage which Lx becomes
“L” level within 1ms
V
IN
=5.0V L
X
=5.0V V
CE
=0V V
OUT
=open
Test frequency=1MHz
ΔT=40℃
CONDITIONS
When connected to external components,
V
IN
=V
CE
=5.0V, I
OUT
=30mA
MIN.
1.764
2.0
400
1.00
-
-
-
1020
120
-
100
-
-
-
-
-
-
-
700
-
0.65
V
SS
- 0.1
- 0.1
-
1.0
0.675
200
-
-
TYP.
1.800
-
-
1.40
22
15
0
1200
160
200
-
-
89
0.35
0.42
0.45
0.52
0.01
800
±100
-
-
-
-
0.32
-
0.900
300
4.7
600
MAX.
1.836
6.0
-
1.78
50
33
1.0
1380
200
300
-
0
-
0.55
0.67
0.65
0.77
1.0
1000
-
6.0
0.25
0.1
0.1
0.50
20
1.125
450
-
-
UNITS CIRCUIT
V
V
mA
V
μ
A
μ
A
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
mA
ppm/
℃
V
V
μ
A
μ
A
ms
ms
V
Ω
μ
H
mA
①
①
①
②
②
③
①
⑩
①
③
③
①
④
④
-
-
⑨
⑥
①
③
③
⑤
⑤
①
⑦
⑦
⑧
-
-
Lx SW "H" ON Resistance 1
R
L½H1
Lx SW "H" ON Resistance 2
R
L½H2
Lx SW "L" ON Resistance 1
R
L½L1
Lx SW "L" ON Resistance 2
R
L½L2
(*5)
Lx SW "H" Leakage Current
I
LeakH
Current Limit
(*9)
I
LIM
Output Voltage
△V
OUT
/
(V
OUT
・△Topr)
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
C
L
Discharge
Inductance Value
Allowed Inductor Current
V
CEH
V
CEL
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
R
DCHG
L
I
DC
Test conditions: Unless otherwise stated, V
IN
=5.0V, V
OUT (T)
=Nominal Voltage
NOTE:
(*1)
Including hysteresis operating voltage range.
(*2)
EFFI={ ( output voltage×output current ) / ( input voltage×input current) }×100
(*3)
ON resistance (Ω)=(V
IN
- Lx pin measurement voltage) / 100mA
(*4)
Design value
(*5)
When temperature is high, a current of approximately 10μ (maximum) may leak.
A
(*6)
Time until it short-circuits V
OUT
with GND via 1Ω of resistor from an operational state and is set to Lx=0V from current limit pulse generating.
(*7)
When V
IN
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
(*8)
When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
(*9)
Current limit denotes the level of detection at peak of coil current.
(*10)
“H”=V
IN
~V
IN
-1.2V, “L”=+0.1V~-0.1V
(*11)
I
PFM
and DTY
LIMIT_PFM
are defined only for the XCL202 series which have PFM control function. (Not for the XCL201 series)
5/22
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