XCL205/XCL206/XCL207
Series
Inductor Built-in Step-Down “micro DC/DC” Converters
ETR2801-014
☆GreenOperation
Compatible
■GENERAL
DESCRIPTION
The XCL205/XCL206/XCL207 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 600mA is
configured using only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V
(XCL20xG:1.8V½6.0V)
. Output voltage is internally set in a range from 0.8V to
4.0V in increments of 0.05V. The device is operated by 3.0MHz, and includes 0.42ΩP-channel driver transistor and 0.52Ω
N-channel switching transistor. As for operation mode, the XCL205 series is PWM control, the XCL206 series is automatic
PWM/PFM switching control and the XCL207 series can be manually switched between the PWM control mode and the
automatic PWM/PFM switching control mode, 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 1.0μA or
less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage
becomes 1.4V or lower. XCL205B(G,F)/XCL206B(G,F)/XCL207B(G,F) series provide short-time turn-on by the soft start
function internally set in 0.25 ms (TYP). XCL205B(C,G,F) /XCL206 B(C,G,F) / XCL207B(C,G,F) 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
●Electronic
dictionaries
■FEATURES
Ultra Small
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Capacitor
CE Function
: 2.5mm×2.0mm, H=1.0mm
: 2.0V ~ 6.0V(A/B/C Type)
1.8V ~ 6.0V(G/F Type)
: 0.8V ~ 4.0V (+2.0%)
: 90% (V
IN
=4.2V, V
OUT
=3.3V)
: 600mA
: 3.0MHz (+15%)
: 100%
: Low ESR Ceramic
: Active High
Soft-Start Circuit Built-In
C
L
High Speed Auto Discharge
:Current Limiter Circuit Built-In
(Constant Current & Latching)
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
: -40℃½+85℃
: EU RoHS Compliant, Pb Free
Protection Circuits
Control Methods
Operating Ambient Temperature
Environmentally Friendly
■TYPICAL
APPLICATION CIRCUIT
XCL205/206/207 Series A/B/C/G Types
L1
L
X
CL
10μF
600mA
V
OUT
CE/MODE
L2
Vss
V
IN
Vss
CIN
4.7μF
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XCL205A333xx/XCL206A333xx/XCL207A333xx
100
80
Efficency:EFFI(%)
60
40
20
VOUT=3.3V
0
0.1
1
10
100
1000
Output Current:I
OUT
(mA)
XCL206/XCL207(PWM/PFM)
VIN= 5.5V
5.0V
4.2V
XCL205/XCL207
(PWM)
(TOP VIEW)
* “L1 and L
X
”, and “L2 and V
OUT
” is connected by wiring.
1/27
XCL205/XCL206/XCL207
Series
■PIN
CONFIGURATION
L1
7
V
IN
6
Vss 5
CE/MODE 4
8
L2
1 Lx
2 Vss
3 V
OUT
/FB
* 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
FB
CE / MODE
V
IN
L1
L2
FUNCTIONS
Switching Output
Ground
Fixed Output Voltage Pin (A/B/C/G types)
Output Voltage Sense Pin (F type)
Chip Enable & Mode Switch
Power Input
Inductor Electrodes
■PRODUCT
CLASSIFICATION
●
Ordering
Information
XCL205①②③④⑤⑥-⑦
(*1)
Fixed PWM control
XCL206①②③④⑤⑥-⑦
(*1)
PWM / PFM automatic switching control
XCL207①②③④⑤⑥-⑦
(*1)
Manual Mode Selection Pin (Semi-custom)
DESIGNATOR
ITEM
SYMBOL
A
B
C
G
Output Voltage
External Setting
F
DESCRIPTION
V
IN
≧2.0V,
No C
L
auto discharge, Standard soft-start
V
IN
≧2.0V,
Fixed Output Voltage
C
L
auto discharge, High speed soft-start
V
IN
≧2.0V,
Fixed Output Voltage
C
L
auto discharge, Standard soft-start
V
IN
≧1.8V,
Fixed Output Voltage
C
L
auto discharge, High speed soft-start
V
IN
≧1.8V,
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
External Setting 0.8V ( F type)
①
Functions selection
(All CE active high)
Fixed Output
Voltage
②③
Fixed Output Voltage
0~9
A~M
④
⑤⑥-⑦
Output Voltage External Setting
Oscillation Frequency
Packages
(Order Unit)
08
3
AR-G
(*2)
CR-G
(*3)
3.0MHz
CL-2025 (3,000pcs/Reel)
CL-2025-02(3,000pcs/Reel)
(*1) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
(*2) AR-G is storage temperature range "-40
℃
~ +105
℃".
(*3) CR-G is storage temperature range "-40
℃
~ +125
℃".
2/27
XCL205/XCL206/XCL207
Series
■BLOCK
DIAGRAM
1) XCL205 / XCL206 / XCL207 series A Type
2) XCL205 / XCL206 / XCL207 series B/C/G Type
3) XCL205 / XCL206 / XCL207 series F Type
L2
Inductor
L1
Current Feedback
Current Limit
FB
FB
Phase
Compensation
Error
Amp.
PWM
Comparator
Logic
Synch
Buffer
Drive
Lx
VSHORT
Vref with
Soft Start,
CE
PWM/PFM
Selector
V
IN
R3
V
SS
UVLO Cmp
Ramp Wave
Generator
OSC
CE/MODE
Control
Logic
CE/
UVLO
V
SS
R4
CE/MODE
NOTE: The XCL205 offers a fixed PWM control, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "L" level inside.
The XCL206 control scheme is PWM/PFM automatic switching, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to
"H" level inside.
The diodes placed inside are ESD protection diodes and parasitic diodes.
■ABSOLUTE
MAXIMUM RATINGS
Ta = 25℃
PARAMETER
V
IN
Pin Voltage
L
X
Pin Voltage
V
OUT
Pin Voltage(A/B/C/G types)
V
FB
Pin Voltage(F type)
CE/MODE Pin Voltage
L
X
Pin Current
Power Dissipation
Operating Ambient Temperature
Storage
Temperature
(*2)
CL-2025
CL-2025-02
SYMBOL
V
IN
VL
X
V
OUT
V
FB
V
CE
IL
X
Pd
Topr
Tstg
RATINGS
- 0.3 ~ +6.5
- 0.3 ~ V
IN
+ 0.3
- 0.3 ~ +6.5
- 0.3 ~ +6.5
- 0.3 ~ +6.5
UNITS
V
V
V
V
V
mA
mW
℃
℃
±1500
1000
(*1)
- 40 ~ + 85
- 40 ~ + 105
- 40 ~ + 125
(*1) The power dissipation figure shown is PCB mounted (40mm×40mm, t=1.6mm, Glass Epoxy FR-4).
Please refer to page 17 for details.
(*2) Storage temperature, are divided by the product specification of the package.
3/27
XCL205/XCL206/XCL207
Series
■ELECTRICAL
CHARACTERISTICS
●XCL205Axx3AR/XCL206Axx3AR/XCL207Axx3AR/XCL205Axx3CR/XCL206Axx3CR/XCL207Axx3CR,
Ta=25℃
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current (XCL205)
Supply Current (XCL206, XCL207)
Stand-by Current
Oscillation Frequency
PFM Switching Current
(*12)
PFM Duty Limit
(*12)
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
D
MAX
D
MIN
EFFI
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V
When connected to external components
(*9)
V
CE
=V
IN
,V
OUT
=0V,
Voltage which Lx pin holding “L” level
(*1, *11)
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)
+1.0V, 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
CONDITIONS
When connected to external components,
V
IN
=V
CE
=5.0V, I
OUT
=30mA
MIN.
<E-1>
2.0
600
1.00
-
-
-
2550
<E-4>
-
100
-
TYP.
<E-2>
-
-
1.40
46
21
0
3000
<E-5>
200
-
-
<E-7>
0.35
0.42
0.45
0.52
0.01
0.01
1050
±100
-
-
-
MAX.
<E-3>
6.0
-
1.78
65
35
1.0
3450
<E-6>
300
-
0
-
0.55
0.67
0.65
0.77
1.0
1.0
1350
-
V
IN
0.25
V
IN
- 1.0
UNITS CIRCUIT
V
V
mA
V
μA
μA
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
μA
mA
ppm/
℃
V
V
V
①
①
①
③
②
②
①
⑩
①
③
③
①
④
④
-
-
⑤
⑤
⑥
①
③
③
①
Lx SW "H" ON Resistance 1
R
L½H
Lx SW "H" ON Resistance 2
R
L½H
Lx SW "L" ON Resistance 1
R
L½L
Lx SW "L" ON Resistance 2
R
L½L
(*5)
Lx SW "H" Leakage Current
I
LEAKH
(*5)
Lx SW "L" Leakage Current
I
LEAKL
Current Limit
(*10)
I
LIM
Output Voltage
△V
OUT
/
(V
OUT
・△Topr)
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
PWM "H" Level Voltage
(*13)
V
CEH
V
CEL
V
PWMH
PWM "L" Level Voltage
(*13)
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
Inductance Value
Allowed Inductor Current
V
PWML
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
L
I
DC
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)
-
(*3)
V
IN
=V
CE
=3.6V, V
OUT
=0V, IL
X
=100mA
-
(*4)
V
IN
=V
CE
=5.0V
-
V
IN
=V
CE
=3.6V,
(*4)
-
V
IN
=V
OUT
=5.0V, V
CE
=0V, L
X
=0V
-
V
IN
=V
OUT
=5.0V, V
CE
=0V, L
X
= 5.0V
-
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT(T)
×0.9V
(*8)
900
I
OUT
=30mA
-
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
CE
,
0.65
Voltage changes Lx to “H” level
(*11)
V
OUT
=0V, Applied voltage to V
CE
,
V
SS
Voltage changes Lx to “L” level
(*11)
When connected to external components,
I
OUT
=1mA
(*6),
Voltage which oscillation
-
(*13)
frequency becomes 2550kHz≦f
OSC
≦3450kHz
When connected to external components,
V
IN
-
I
OUT
=1mA
(*6)
, Voltage which oscillation
0.25
frequency becomes f
OSC
＜2550kHz
(*13)
V
IN
=V
CE
=5.0V, V
OUT
=0V
- 0.1
V
IN
=5.0V, V
CE
=0V, V
OUT
=0V
- 0.1
When connected to external components,
0.5
V
CE
=0V→V
IN
, I
OUT
=1mA
V
IN
=V
CE
=5.0V, V
OUT
=0.8×V
OUT(T)
1.0
Short Lx at 1Ω resistance
(*7)
Sweeping V
OUT
, V
IN
=V
CE
=5.0V, Short Lx at
1Ω resistance, V
OUT
voltage which Lx becomes “L” <E-8>
level within 1ms
Test frequency=1MHz
-
ΔT=40℃
-
-
-
-
0.9
-
-
0.1
0.1
2.5
20
V
μA
μA
ms
ms
V
μH
mA
①
⑤
⑤
①
⑦
⑦
<E-9> <E-10>
1.5
1000
-
-
4/27
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: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the
operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than V
IN
minus
0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than V
IN
minus 1.0V and equal to or greater than V
CEH
.
*7: Time until it short-circuits V
OUT
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When V
IN
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: 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.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=V
IN
~V
IN
-1.2V, “L”=+0.1V~-0.1V
*12: I
PFM
and DTY
LIMIT_PFM
are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)
*13: V
PWMH
and V
PWML
are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
XCL205/XCL206/XCL207
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
●XCL205Bxx3AR/XCL206Bxx3AR/XCL207Bxx3AR/XCL205Bxx3CR/XCL206Bxx3CR/XCL207Bxx3CR,
Ta=25℃
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current (XCL205)
Supply Current (XCL206, XCL207)
Stand-by Current
Oscillation Frequency
PFM Switching Current
(*12)
PFM Duty Limit
(*12)
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
D
MAX
D
MIN
EFFI
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V
When connected to external components
(*9)
V
CE
=V
IN
,V
OUT
=0V,
Voltage which Lx pin holding “L” level
(*1, *11)
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)
+1.0V, 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
(*8)
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
CE
,
Voltage changes Lx to “H” level
(*11)
V
OUT
=0V, Applied voltage to V
CE
,
Voltage changes Lx to “L” level
(*11)
When connected to external components,
I
OUT
=1mA
(*6),
Voltage which oscillation
frequency becomes 2550kHz≦f
OSC
≦3450kHz
(*13)
When connected to external components,
I
OUT
=1mA
(*6)
, Voltage which oscillation
frequency becomes f
OSC
＜2550kHz
(*13)
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
(*7)
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.
<E-1>
2.0
600
1.00
-
-
-
2550
<E-4>
-
100
-
-
-
-
-
-
-
900
-
0.65
V
SS
-
V
IN
-
0.25
- 0.1
- 0.1
-
1.0
<E-8>
200
-
-
TYP.
<E-2>
-
-
1.40
46
21
0
3000
<E-5>
200
-
-
<E-7>
0.35
0.42
0.45
0.52
0.01
1050
±100
-
-
-
-
-
-
MAX.
<E-3>
6.0
-
1.78
65
35
1.0
3450
<E-6>
300
-
0
-
0.55
0.67
0.65
0.77
1.0
1350
-
V
IN
0.25
V
IN
- 1.0
-
0.1
0.1
UNITS CIRCUIT
V
V
mA
V
μA
μA
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
mA
ppm/
℃
V
V
V
V
μA
μA
ms
ms
V
Ω
μH
mA
①
①
①
③
②
②
①
⑩
①
③
③
①
④
④
-
-
⑨
⑥
①
③
③
①
①
⑤
⑤
①
⑦
⑦
⑧
Lx SW "H" ON Resistance 1
R
L½H
Lx SW "H" ON Resistance 2
R
L½H
Lx SW "L" ON Resistance 1
R
L½L
Lx SW "L" ON Resistance 2
R
L½L
Lx SW "H" Leakage Current
(*5)
I
LEAKH
Current Limit
(*10)
I
LIM
Output Voltage
△V
OUT
/
Temperature Characteristics (V
OUT
・△Topr)
CE "H" Voltage
CE "L" Voltage
PWM "H" Level Voltage
(*13)
PWM "L" Level Voltage
(*13)
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
V
PWMH
V
PWML
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
R
DCHG
L
I
DC
<E-11> <E-12>
-
20
<E-9> <E-10>
300
1.5
1000
450
-
-
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: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the
operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than V
IN
minus
0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than V
IN
minus 1.0V and equal to or greater than V
CEH
.
*7: Time until it short-circuits V
OUT
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When V
IN
is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: 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.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=V
IN
~V
IN
-1.2V, “L”=+0.1V~-0.1V
*12: I
PFM
and DTY
LIMIT_PFM
are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)
*13: V
PWMH
and V
PWML
are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
5/27
PCB Design
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