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PDF XCL208 Data sheet ( Hoja de datos )
| Número de pieza | XCL208 | |
| Descripción | 400mA Inductor Built-in Step-Down micro DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XCL208 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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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
1 page  
XCL208/XCL209
Series
■ELECTRICAL CHARACTERISTICS
1) XCL208Axx3DR/XCL209Axx3DR
PARAMETER
SYMBOL
Output Voltage
Operating Voltage Range
VOUT
VIN
Maximum Output Current
IOUTMAX
CONDITIONS
VIN=VCE=5.0V, IOUT=30mA
VIN=VOUT(T)+2.0V, VCE=1.0V (*8)
UVLO Voltage
Supply Current (XCL208)
Supply Current (XCL209)
Stand-by Current
VUVLO
IDD
ISTB
VCE =VIN, VOUT =0V, Voltage which Lx pin holding
“L” level (*1),(*10)
VIN=VCE=5.0V, VOUT=VOUT(T)×1.1V
VIN=5.0V, VCE=0V, VOUT=VOUT(T)×1.1V
Oscillation Frequency
fOSC VIN=VOUT(T)+2.0V, VCE=1.0V, IOUT=100mA
MIN.
<E-1>
2.0
TYP.
<E-2>
-
400 -
1.00
-
-
-
2.55
1.40
46
21
0
3.00
MAX.
<E-3>
6.0
-
1.78
65
35
1
3.45
Ta=25℃
UNIT CIRCUIT
V①
V①
mA ①
V③
μA
μA
MHz
②
②
①
PFM Switching Current (*11)
IPFM VIN=VOUT(T)+2.0V, VCE=VIN , IOUT=1mA
<E-4> <E-5> <E-6> mA
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)
DTYLIMIT_PFM
DMAX
DMIN
EFFI
RLxH1
RLxH2
RLxL1
RLxL2
ILeakH
VCE=VIN=<C-1>, IOUT=1mA
VIN=VCE=5.0V, VOUT=VOUT(T)×0.9V
VIN=VCE=5.0V, VOUT=VOUT(T)×1.1V
When connected to external components,
VCE=VIN=VOUT(T)+1.2V, IOUT=100mA
VIN=VCE=5.0V, VOUT=0V, ILX=100mA (*3)
VIN=VCE=3.6V, VOUT=0V, ILX=100mA (*3)
VIN=VCE=5.0V (*4)
VIN=VCE=3.6V (*4)
VIN=VOUT=5.0V, VCE=0V, VLX=0V
- 200
100 -
--
300
-
0
- <E-7>
-
- 0.35 0.55
- 0.42 0.67
- 0.45 0.65
- 0.52 0.77
- 0.01 1.00
%
%
%
%
Ω
Ω
Ω
Ω
μA
LX SW "L" Leakage Current (*5)
ILeakL
VIN=VOUT=5.0V, VCE= 0V, VLX=5.0V
- 0.01 1.00 μA
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
Inductance Value
Allowed Inductor Current
ILIM
∆VOUT/
(VOUT･∆Topr)
VCEH
VCEL
ICEH
ICEL
tSS
tLAT
VSHORT
L
IDC
VIN=VCE=5.0V, VOUT=VOUT(T)×0.9V (*7)
IOUT=30mA,
-40℃≦Topr≦85℃
VOUT=0V, Applied voltage to VCE,
Voltage changes Lx to “H” level (*10)
VOUT=0V, Applied voltage to VCE,
Voltage changes Lx to “L” level (*10)
VIN=VCE= 5.0V, VOUT=0V
VIN=5.0V, VCE=0V, VOUT=0V
VCE=0V→VIN, IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8×VOUT(T),
Short Lx at 1Ω resistance (*6)
Sweeping VOUT, VIN=VCE=5.0V,
Short Lx at 1Ω resistance, VOUT voltage which
Lx becomes “L” level within 1ms
Test Frequency=1MHz
∆T=40℃
600
-
0.65
AVSS
-0.1
-0.1
0.5
1
<E-8>
-
-
800
±100
-
-
-
-
0.90
-
<E-9>
1.5
700
1000
-
6.00
0.25
0.1
0.1
2.50
20
<E-10>
-
-
mA
ppm/℃
V
V
μA
μA
ms
ms
V
μH
mA
⑩
①
③
③
①
④
④
-
-
⑤
⑤
⑥
①
③
③
⑤
⑤
①
⑦
⑦
-
-
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(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)=(VIN - 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 VOUT with GND via 1Ω of resistor from an operational state and is set to Lx=0V from current limit pulse generating.
(*7) When VIN 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”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
(*11) IPFM and DTYLIMIT_PFM are defined only for the XCL209 series.
5/22
5 Page 
XCL208/XCL209
Series
■OPERATIONAL DESCRIPTION(Continued)
<Short-Circuit Protection>
The short-circuit protection circuit monitors the internal R1 and R2 divider voltage (Type F: FB pin voltage). In case where
output is accidentally shorted to the Ground and when the FB point voltage decreases less than half of the reference voltage
(Vref) and a current more than the ILIM flows to the driver transistor, the short-circuit protection quickly operates to turn off
and to latch the driver transistor. In the latch state, the operation can be resumed by either turning the IC off and on via the
CE pin, or by restoring power supply to the VIN pin.
Also, when sharp load transient happens, a voltage drop at the VOUT is propagated through CFB, as a result, short circuit
protection may operate in the voltage higher than short-circuit protection voltage.
<UVLO Circuit>
When the VIN pin voltage becomes 1.4V (TYP.) or lower, the P-channel output driver transistor is forced OFF to prevent false
pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8V or higher, by
releasing the UVLO state then the soft-start function initiates output startup operation. The soft-start function operates even
when the VIN pin voltage falls momentarily below the UVLO operating voltage same as releasing the UVLO function. The
UVLO circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal
circuitry remains in operation.
<PFM Switch Current>
In PFM control operation, until coil current reaches to IPFM, the IC keeps the P-ch MOSFET on.
In this case, on-time (tON) that the P-ch MOSFET is kept on can be given by the following formula.
tON = L×IPFM / (VIN－VOUT) →IPFM①
<PFM Duty Limit>
In the PFM control operation, the maximum PFM Duty Limit is set to 200% (TYP.). Therefore, under the condition that the
step-down ratio is small, it’s possible for P-ch MOSFET to be turned off even when coil current doesn’t reach to IPFM. →IPFM②
IPFM①
IPFM②
<CL High Speed Discharge>
The XCL208B/XCL209B and the XCL208F/XCL209F can quickly discharge the electric charge at the output capacitor (CL)
when a low signal to the CE pin which enables a whole IC circuit put into OFF state, is inputted via the N-ch transistor located
between the LX pin and the VSS pin. When the IC is disabled, electric charge left at the output capacitor (CL) is quickly
discharged so that it may avoid application malfunction. Discharge time is set by the CL auto-discharge resistance (RDCHG) and
the output capacitance (CL). By setting time constant as τ(τ=CL x RDCHG), discharge time of the output voltage is calculated
by the following formula.
V = VOUT(T) x e –t/τ or t=τln (VOUT(T) / V)
V : Output voltage after discharge
VOUT(T) : Output voltage
t: Discharge time,
τ: CL x RDCHG
CL : Output capacitance (CL)
RDCHG : CL auto-discharge resistance
100
90
80
70
60
50
40
30
20
10
0
0
CL=10uF
CL=20uF
CL=50uF
10 20 30 40 50 60 70 80 90 100
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet XCL208.PDF ] | |
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