XCL208/XCL209
Series
400mA Inductor Built-in Step-Down “micro DC/DC” Converters
ETR28003-004
■GENERAL
DESCRIPTION
☆GreenOperation
Compatible
The XCL208/XCL209 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in
one tiny package (2.5mm×2.15mm, h=1.05mm). A stable power supply with an output current of 400mA is configured using only
two capacitors connected externally.
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 1.8V (2.0V) to 6.0V enables support for applications that require an alkaline battery (2-cell) or
AC adapter (5V) power supply. An internally fixed output voltage (0.8V to 4.0V) or an externally set output voltage can be selected.
The XCL208/XCL209 series uses synchronous rectification at an operating frequency of 3.0MHz. PWM control (XCL208) or
automatic PWM/PFM switching control (XCL209) can be selected. The XCL208 series has a fixed frequency, enabling the
suppression of output ripple. The XCL209 series achieves high efficiency while holding down output ripple across the full range of
loads, from light to heavy, enabling the extension of battery operation time.
Soft start and on/off functions with C
L
discharge are provided, and the IC can be put in the standby state by inputting a Low level
signal into the CE pin.
■APPLICATIONS
●Mobile
phones, Smart phones
●Bluetooth
Headsets
●Tablet
PCs
●PND
●PC
peripheral devices
●DSC,
Camcorders
■FEATURES
Input Voltage
Fixed Output Voltage
High Efficiency
Output Current
Oscillation Frequency
CE Function
:
:
:
:
:
:
:
1.8V ~ 6.0V (Type F)
2.0V ~ 6.0V (Type A/B)
0.8V ~ 4.0V (±2.0%)
90% (V
IN
=4.2V, V
OUT
=3.3V)
400mA
3.0MHz (±15%)
Active High
Soft-start Circuit Built-in
C
L
High Speed Auto Discharge
Current Limiter Built-in
(Constant Current & Latching)
PWM (XCL208)
PWM/PFM (XCL209)
-40℃½+85℃
USP-10B03
EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
Protection Circuits
Control Methods
:
:
Operating Ambient Temperature :
Package
:
Environmentally Friendly
:
■
TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current
XCL208A / XCL208B / XCL209A / XCL209B Type
100
80
Efficiency:EFFI(%)
60
V
IN
= 4.2V
XCL208x333DR/XCL209x333D
XCL209(PWM/PFM)
40
5.0V
XCL208(PWM)
20
V
OUT
=3.3V
0
0.01
0.1
1
10
100
1000
Output Current:I
OUT
(mA)
XCL208F / XCL209F Type
1/22
XCL208/XCL209
Series
■BLOCK
DIAGRAM
1)XCL208A / XCL209A Type
2) XCL208B / XCL209B Type
L1
L2
L1
L2
V
OUT
V
O UT
L
X
L
X
V
IN
PV
SS
V
IN
PV
SS
AV
SS
CE
AV
SS
CE
3)XCL208F / XCL209F Type
L1
L2
FB
L
X
V
IN
PV
SS
AV
SS
CE
NOTE:
The XCL208 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The XCL209 control
scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed to "H" level inside.
inside are ESD protection diodes and parasitic diodes.
The diodes placed
2/22
XCL208/XCL209
Series
■PRODUCT
CLASSIFICATION
XCL208①②③④⑤⑥ Fixed PWM
XCL209①②③④⑤⑥ PWM/PFM Auto Switching
DESIGNATOR
ITEM
SYMBOL
A
①
Type
B
F
10
12
15
18
25
28
2L
30
33
08
3
DR
DESCRIPTION
V
IN
≧2.0V
Fixed Output Voltage
Standard soft-start , No C
L
auto discharge
V
IN
≧2.0V
Fixed Output Voltage
C
L
auto discharge, High speed soft-start
V
IN
≧1.8V
Output Voltage External Setting
C
L
auto discharge, High speed soft-start
1.0V
1.2V
1.5V
1.8V
2.5V
2.8V
2.85V
3.0V
3.3V
External Setting 0.8V (XCL208F/XCL209F)
3.0MHz
USP-10B03 (3,000psc/Reel)
②③
Output Voltage
(*1)
④
⑤⑥
(*1)
Oscillation Frequency
(*2)
Package (Order Unit)
When other output voltages (semi-custom) are needed, please contact your local Torex sales office for more information.
Output voltage range is 0.8~4.0V.
(*2)
Halogen free and EU RoHS compliant.
3/22
XCL208/XCL209
Series
■PIN
CONFIGURATION
VIN 8
9
NC
CE
7
6
10
AVSS 5
L2
4 VOUT
2
3
LX
NC
L1
1 PVSS
(BOTTOM VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
USP-10B03
1
2
3
4
5
6
7
8
9
10
PIN NAME
PVSS
LX
NC
FB
VOUT
AVSS
CE
NC
VIN
L1
L2
FUNCTIONS
(Power) Ground
Switching Output
No Connection
Output Voltage Sense Pin (Type F)
Fixed Output Voltage Pin (Type A/B)
(Analog) Ground
Active High Enable
No Connection
Power Supply Input
Inductor Electrodes
Inductor Electrodes
■FUNCTION
PIN NAME
CE
SIGNAL
L
H
CONDITIONS
AV
SS
≦V
CE
≦0.25V
0.65V≦V
CE
≦6V
STATUS
Stand-by
Active
* When the CE pin is left open, the IC may operate unstable.
Please do not leave the CE pin open.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
Input Voltage
Lx Pin Voltage
Output Voltage
FB Pin Voltage
CE Input Voltage
Lx Pin Current
Power Dissipation
(*1)
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
IN
V
Lx
V
OUT
V
FB
V
CE
I
LX
Pd
Topr
Tstg
RATINGS
-0.3½6.5
-0.3½V
IN
+0.3≦6.5
-0.3½6.5
-0.3½6.5
-0.3½6.5
±1500
500
-40½+85
-40½+125
UNITS
V
V
V
V
V
mA
mW
℃
℃
Each voltage rating uses the V
SS
pin as a reference.
(*1)
The value is an example data which is taken with the PCB mounted.
4/22
XCL208/XCL209
Series
■ELECTRICAL
CHARACTERISTICS
1) XCL208Axx3DR/XCL209Axx3DR
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current (XCL208)
Supply Current (XCL209)
Stand-by Current
Oscillation Frequency
PFM Switching Current
(*11)
PFM Duty Limit
(*11)
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
(*2)
L
X
SW "H" ON Resistance 1
L
X
SW "H" ON Resistance 2
L
X
SW "L" ON Resistance 1
L
X
SW "L" ON Resistance 2
L
X
SW "H" Leakage Current
(*5)
L
X
SW "L" 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
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
LxH1
R
LxH2
R
LxL1
R
LxL2
I
LeakH
I
LeakL
I
LIM
∆V
OUT
/
(V
OUT
½∆Topr)
V
CEH
V
CEL
I
CEH
I
CEL
t
SS
t
LAT
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V
(*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
V
IN
=V
OUT(T)
+2.0V, V
CE
=1.0V, I
OUT
=100mA
V
IN
=V
OUT(T)
+2.0V, V
CE
=V
IN
, I
OUT
=1mA
V
CE
=V
IN
=<C-1>, 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, I
LX
=100mA
(*3)
V
IN
=V
CE
=3.6V, V
OUT
=0V, I
LX
=100mA
V
IN
=V
CE
=5.0V
(*4)
V
IN
=V
CE
=3.6V
(*4)
(*3)
Ta=25℃
CONDITIONS
V
IN
=V
CE
=5.0V, I
OUT
=30mA
MIN.
<E-1>
2.0
400
1.00
-
-
-
2.55
<E-4>
-
100
-
-
-
-
-
-
-
-
600
-
0.65
AV
SS
-0.1
-0.1
0.5
1
TYP.
<E-2>
-
-
1.40
46
21
0
3.00
<E-5>
200
-
-
<E-7>
0.35
0.42
0.45
0.52
0.01
0.01
800
±100
-
-
-
-
0.90
-
MAX.
<E-3>
6.0
-
1.78
65
35
1
3.45
<E-6>
300
-
0
-
0.55
0.67
0.65
0.77
1.00
1.00
1000
-
6.00
0.25
0.1
0.1
2.50
20
UNIT
V
V
mA
V
μA
μA
MHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
μA
mA
ppm/℃
V
V
μA
μA
ms
ms
CIRCUIT
①
①
①
③
②
②
①
⑩
①
③
③
①
④
④
-
-
⑤
⑤
⑥
①
③
③
⑤
⑤
①
⑦
V
IN
=V
OUT
=5.0V, V
CE
=0V, V
LX
=0V
V
IN
=V
OUT
=5.0V, V
CE
= 0V, V
LX
=5.0V
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
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
Test Frequency=1MHz
∆T=40℃
Short Protection Threshold Voltage
Inductance Value
Allowed Inductor Current
V
SHORT
L
I
DC
<E-8>
-
-
<E-9>
1.5
700
<E-10>
-
-
V
μH
mA
⑦
-
-
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 XCL209 series.
5/22
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