XCL205/XCL206/XCL207
Series
Inductor Built-in Step-Down “micro DC/DC” Converters
ETR2801-005c
☆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. 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 0.52ΩN-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/XCL206B/XCL207B series provide short-time turn-on by the soft start function internally set in 0.25 ms
(TYP). XCL205B(C) /XCL206 B(C) / XCL207B(C) 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
: 2.5mm×2.0mm, H=1.0mm
: 2.0V ~ 6.0V
: 0.8V ~ 4.0V (+2.0%)
: 85% (TYP.)
: 600mA
: 3.0MHz (+15%)
: 100%
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
High Speed Soft-Start Circuit Built-In
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
C
L
High Speed Auto Discharge
* Performance depends on external components and wiring on the PCB.
Ultra Small
Input Voltage
Output Voltage
High Efficiency (V
OUT
=1.8V)
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XCL205/206/207 Series
XCL205A333xx/XCL206A333xx/XCL207A333xx
100
80
V
IN
Vss
CE/MODE
L2
CIN
4.7μF
XCL206/XCL207(PWM/PFM)
L1
L
X
CL
10μF
600mA
V
OUT
Vss
Efficency:EFFI(%)
60
40
20
VIN= 5.5V
5.0V
4.2V
XCL205/XCL207
(PWM)
VOUT=3.3V
0
(TOP VIEW)
* “L1 and L
X
”, and “L2 and V
OUT
” is connected by wiring.
0.1
1
10
100
1000
Output Current:I
OUT
(mA)
1/26
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
* 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 / MODE
V
IN
L1
L2
FUNCTION
Switching Output
Ground
Output Voltage
Chip Enable & Mode Switch
Power Input
Inductor Electrodes
■PRODUCT
CLASSIFICATION
●
Ordering
Information
XCL205①②③④⑤⑥-G* Fixed PWM control
XCL206①②③④⑤⑥-G* PWM / PFM automatic switching control
XCL207①②③④⑤⑥-G* Manual Mode Selection Pin (Semi-custom)
DESIGNATOR
DESCRIPTION
SYMBOL
A
①
Functions selection
(All CE active high)
B
C
DESCRIPTION
Low speed soft-start, No CL auto discharge
High speed soft-start, C
L
auto discharge
Low speed soft-start, C
L
auto discharge
e.g. V
OUT
=2.8V→②=2,
③=8
V
OUT
=2.85V→②=2,
③=L
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
3.0MHz
Control number assigned for micro DC/DC
Embossed tape, standard feed
②③
Output Voltage
08~40
④
⑤
⑥
Oscillation Frequency
Device Structure
Device Orientation
3
A
R
*
The ”-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
2/26
XCL205/XCL206/XCL207
Series
■BLOCK
DIAGRAM
●XCL205A
/ XCL206A / XCL207A series
L2
Phase
Compensation
Inductor
L1
Current Feedback
Current Limit
V
OUT
R2
CFB
Error Amp.
FB
Logic
PWM
Comparator
Synch
Buffer
Drive
R1
Lx
V
IN
Vref with
Soft Start,
CE
VSHORT
PWM/PFM
Selector
V
SS
UVLO Cmp
UVLO
Ramp Wave
Generator
OSC
V
SS
R3
R4
CE/MODE
Control
Logic
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.
●XCL205B
/ XCL206B / XCL207B / XCL205C / XCL206C / XCL207C series
L2
Phase
Compensation
Inductor
L1
Current Feedback
Current Limit
V
OUT
R2
CFB
Error Amp.
FB
Logic
PWM
Comparator
Synch
Buffer
Drive
R1
Lx
V
IN
Vref with
Soft Start,
CE
VSHORT
PWM/PFM
Selector
V
SS
UVLO Cmp
Ramp Wave
Generator
OSC
CE/
V
SS
UVLO
R3
R4
CE/MODE
Control
Logic
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
CE/MODE Pin Voltage
L
X
Pin Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
IN
VL
X
V
OUT
V
CE
IL
X
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
*1
- 20 ~ + 85
- 40 ~ + 105
UNITS
V
V
V
V
mA
mW
℃
℃
*1: The power dissipation figure shown is PCB mounted (40mm×40mm, t=1.6mm, Glass Epoxy FR-4).
Please refer to page 16 for details.
3/26
XCL205/XCL206/XCL207
Series
■ELECTRICAL
CHARACTERISTICS
●XCL205A123AR/XCL206A123AR/XCL207A123AR,
V
OUT
=1.2V, f
OSC
=3.0MHz, 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
PFM Duty Limit
(*12)
(*12)
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
R
L
½
H
R
L
½
H
R
L
½
L
R
L
½
L
ILeakH
ILeakL
I
LIM
△V
OUT
/
(V
OUT
・△topr)
V
CEH
V
CEL
(*13)
CONDITIONS
When connected to external components,
V
IN
=V
CE
=5.0V, I
OUT
=30mA
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V
(*9)
When connected to external components
V
CE
=V
IN
,V
OUT
=0V,
(*1, *11)
Voltage which Lx pin holding “L” level
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,
(*12)
V
IN
=V
OUT(T)
+2.0V, V
CE
=V
IN
, I
OUT
=1mA
V
CE
= V
IN
=(C-1) I
OUT
=1mA
(*12)
MIN.
1.176
2.0
600
1.00
-
-
-
2550
190
-
100
-
-
-
-
-
-
-
-
900
-
0.65
V
SS
-
V
IN
-
0.25
- 0.1
- 0.1
0.5
1.0
0.450
-
-
TYP.
1.200
-
-
1.40
46
21
0
3000
260
200
-
-
82
0.35
0.42
0.45
0.52
0.01
0.01
1050
±100
-
-
-
MAX.
1.224
6.0
-
1.78
65
35
1.0
3450
350
300
-
0
-
0.55
0.67
0.66
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
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
(*5)
Lx SW "H" Leak Current
(*5)
Lx SW "L" Leak Current
(*10)
Current Limit
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
PWM "H" Level Voltage
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
(*3)
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
(*4)
V
IN
=V
CE
=5.0V
(*4)
V
IN
=V
CE
=3.6V,
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
(*8)
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (E)
×0.9V
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
CE
,
(*11)
Voltage changes Lx to “H” level
V
OUT
=0V, Applied voltage to V
CE
,
(*11)
Voltage changes Lx to “L” level
When connected to external components,
(*6),
I
OUT
=1mA
Voltage which oscillation
(*13)
frequency becomes 2550kHz≦f
OSC
≦3450kHz
When connected to external components,
(*6)
I
OUT
=1mA , Voltage which oscillation
(*13)
frequency becomes f
OSC
＜2550kHz
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)
(*7)
Short Lx at 1Ω resistance
Sweeping V
OUT
, V
IN
=V
CE
=5.0V, Short Lx at
1Ω resistance, V
OUT
voltage which Lx becomes “L”
level within 1ms
Test frequency=1MHz
ΔT=40℃
V
PWMH
PWM "L" Level Voltage
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
(*13)
V
PWML
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
L
I
DC
-
-
-
0.9
-
0.600
1.5
1000
-
0.1
0.1
2.5
20
0.750
-
-
V
μA
μA
ms
ms
V
μH
mA
①
⑤
⑤
①
⑦
⑦
Inductance Value
Allowed Inductor Current
4/26
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)
●XCL205A183AR/XCL206A183AR/XCL207A183AR,
V
OUT
=1.8V, f
OSC
=3.0MHz, 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
PFM Duty Limit
(*12)
(*12)
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
R
L
½
H
R
L
½
H
R
L
½
L
R
L
½
L
ILeakH
ILeakL
I
LIM
△V
OUT
/
(V
OUT
・△topr)
V
CEH
V
CEL
CONDITIONS
When connected to external components,
V
IN
=V
CE
=5.0V, I
OUT
=30mA
V
IN
=V
OUT(E)
+2.0V, V
CE
=1.0V
(*9)
When connected to external components
V
CE
=V
IN
,V
OUT
=0V,
(*1, *11)
Voltage which Lx pin holding “L” level
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,
(*12)
V
IN
=V
OUT(T)
+2.0V, V
CE
=V
IN
, I
OUT
=1mA
V
CE
= V
IN
=(C-1) I
OUT
=1mA
(*12)
MIN.
1.764
2.0
600
1.00
-
-
-
2550
170
-
100
-
-
-
-
-
-
-
-
900
-
0.65
V
SS
TYP.
1.800
-
-
1.40
46
21
0
3000
220
200
-
-
85
0.35
0.42
0.45
0.52
0.01
0.01
1050
±100
-
-
MAX.
1.836
6.0
-
1.78
65
35
1.0
3450
270
300
-
0
-
0.55
0.67
0.66
0.77
1.0
1.0
1350
-
V
IN
0.25
UNITS CIRCUIT
V
V
mA
V
μA
μA
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
μA
mA
ppm/
℃
V
V
①
①
①
③
②
②
①
⑩
①
③
③
①
④
④
-
-
⑤
⑤
⑥
①
③
③
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
(*5)
Lx SW "H" Leak Current
(*5)
Lx SW "L" Leak Current
(*10)
Current Limit
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
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
(*3)
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
(*4)
V
IN
=V
CE
=5.0V
(*4)
V
IN
=V
CE
=3.6V,
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
(*8)
V
IN
=V
CE
=5.0V, V
OUT
=V
OUT (E)
×0.9V
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
CE
,
(*11)
Voltage changes Lx to “H” level
V
OUT
=0V, Applied voltage to V
CE
,
(*11)
Voltage changes Lx to “L” level
When connected to external components,
(*6),
Voltage which oscillation
I
OUT
=1mA
(*13)
frequency becomes 2550kHz≦f
OSC
≦3450kHz
When connected to external components,
(*6)
I
OUT
=1mA , Voltage which oscillation
(*13)
frequency becomes f
OSC
＜2550kHz
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)
(*7)
Short Lx at 1Ω resistance
Sweeping V
OUT
, V
IN
=V
CE
=5.0V, Short Lx at
1Ω resistance, V
OUT
voltage which Lx becomes “L”
level within 1ms
Test frequency =1MHz
ΔT=40℃
PWM "H" Level Voltage
(*13)
V
PWMH
-
-
V
IN
- 1.0
V
①
PWM "L" Level Voltage
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
(*13)
V
PWML
I
CEH
I
CEL
t
SS
t
LAT
V
SHORT
L
I
DC
V
IN
-
0.25
- 0.1
- 0.1
0.5
1.0
0.675
-
-
-
-
-
0.9
-
0.900
1.5
1000
-
0.1
0.1
2.5
20
1.125
-
-
V
μA
μA
ms
ms
V
μH
mA
①
⑤
⑤
①
⑦
⑦
Inductance Value
Allowed Inductor Current
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: IPFM 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)
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