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PDF ( 数据手册 , 数据表 ) XCL208

零件编号 XCL208
描述 400mA Inductor Built-in Step-Down micro DC/DC Converters
制造商 Torex Semiconductor
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XCL208 数据手册, 描述, 功能
XCL208/XCL209 Series
400mA Inductor Built-in Step-Down “micro DC/DC” Converters
ETR28003-002
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 CL 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
TYPICAL APPLICATION CIRCUIT
FEATURES
Input Voltage
Fixed Output Voltage
High Efficiency
Output Current
Oscillation Frequency
CE Function
Protection Circuits
Control Methods
Operating Ambient Temperature
Package
Environmentally Friendly
: 1.8V ~ 6.0V (Type F)
: 2.0V ~ 6.0V (Type A/B)
: 0.8V ~ 4.0V (±2.0%)
: 90% (VIN=4.2V, VOUT=3.3V)
: 400mA
: 3.0MHz (±15%)
: Active High
Soft-start Circuit Built-in
CL High Speed Auto Discharge
: Current Limiter Built-in
(Constant Current & Latching)
: PWM (XCL208)
PWM/PFM (XCL209)
: -40+85
: USP-10B03
: EU RoHS Compliant, Pb Free
XCL208A / XCL208B / XCL209A / XCL209B Type
XCL208F / XCL209F Type
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
XCL208x333DR/XCL209x333D
100
XCL209(PWM/PFM)
80
60
40
20
0
0.01
VIN= 4.2V
5.0V
XCL208(PWM)
V OUT =3.3V
0.1 1
10 100
Output Current:IOUT (mA)
1000
1/22







XCL208 pdf, 数据表
XCL208/XCL209 Series
ELECTRICAL CHARACTERISTICS (Continued)
VOUT
PFM
Duty
VIN (V)
<C-1>
VOUT (V)
MIN. TYP. MAX.
IPFM (mA)
MIN. TYP. MAX.
<E-1> <E-2> <E-3> <E-4> <E-5> <E-6>
EFFI (%)
TYP.
<E-7>
VSHORT (ms)
MIN. TYP. MAX.
tss (ms)
TYP. MAX.
<E-8> <E-9> <E-10> <E-11> <E-12>
1.00 2.0V 0.980 1.000 1.020 190 260 350
1.20 2.20 1.176 1.200 1.224 190 260 350
1.50 2.50 1.470 1.500 1.530 180 240 300
1.80 2.80 1.764 1.800 1.836 170 220 270
2.50 3.50 2.450 2.500 2.550 170 220 270
2.80 3.80 2.744 2.800 2.856 170 220 270
2.85 3.85 2.793 2.850 2.907 170 220 270
3.00 4.00 2.940 3.000 3.060 170 220 270
3.30 4.30 3.234 3.300 3.366 170 220 270
79 0.375 0.500 0.625 0.25 0.40
82 0.450 0.600 0.750 0.25 0.40
84 0.563 0.750 0.938 0.25 0.40
85 0.675 0.900 1.125 0.32 0.50
86 0.938 1.250 1.563 0.32 0.50
86 1.050 1.400 1.750 0.32 0.50
86 1.069 1.425 1.781 0.32 0.50
86 1.125 1.500 1.875 0.32 0.50
86 1.238 1.650 2.063 0.32 0.50
<XCL208/XCL209 F type output voltage setting>
The output voltage can be set by adding external dividing resistors. The output voltage is determined by R1 and R2 in the
equation below. The sum of R1 and R2 is normally kept 1Mor less. The output voltage range can be set from 0.9V to 6.0V
based on the 0.8V ±2.0% reference voltage source.
Note that when the input voltage (VIN) is less than or equal to the set output voltage, an output voltage (VOUT) higher than the
input voltage (VIN) cannot be output.
VOUT=0.8×(R1+R2)/R2
Adjust the value of the phase compensation speedup capacitor CFB so that fzfb=1/(2×π×CFB×R1) is 10kHz or less. It is
optimum to adjust to a value from 1kHz to 20kH based on the components used and the board layout.
[Calculation example]
When R1=470k, R2=150k, VOUT=0.8×(470k+150k)/150k=3.3V
e.g.
VOUT (V)
0.9
1.2
1.5
1.8
2.5
3.0
3.3
4.0
R1 (k)
100
150
130
300
510
330
470
120
R2 (k)
820
300
150
240
240
120
150
30
CFB (pF)
150
100
220
150
100
150
100
470
Circuit (XCL208F/XCL209F Type)
8/22







XCL208 equivalent, schematic
XCL208/XCL209 Series
TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output Current
(2) Output Voltage vs. Output Current
XCL208B183DR/XCL209B183DR
100
XCL209(PWM/PFM)
80
60
2.4V
40     3.6V
VIN= 4.2V
20
XCL208
(PWM)
XCL208B183DR/XCL209B183DR
2.1
2.0 XCL208/XCL209
1.9 VIN=4.2V,3.6V,2.4V
1.8
1.7
1.6
0
0.1
1 10 100
Output Current:IOUT (mA)
(3) Ripple Voltage vs. Output Current
XCL208B183DR/XCL209B183DR
100
1000
80
60
XCL208
40
VIN=2.4
V 3.6V,4.2V
20
XCL209
VIN=2.4V
3.6V,4.2
0
0.1
1 10 100
Output Current:IOUT (mA)
(5) Supply Current vs. Ambient Temperature
40
35
30
25
20
15
10
5
0
-50
XCL209B183DR
4.0V
VIN=6.0V
2.0V
-25 0 25 50 75
Ambient Temperature: Ta ()
1000
100
1.5
0.1
1 10 100
Output Current:IOUT (mA)
1000
(4) Oscillation Frequency vs. Ambient Temperature
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
-50
XCL208B183DR/XCL209B183DR
VIN=3.6V
-25 0
25 50 75
Ambient Temperature: Ta ()
(6) Output Voltage vs. Ambient Temperature
100
XCL208B183DR/XCL209B183DR
2.1
2.0
1.9
VIN=3.6V
1.8
1.7
1.6
1.5
-50
-25 0
25 50 75
Ambient Temperature: Ta ()
100
16/22










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