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PDF XC9270 Fiche technique ( Data sheet )

Numéro de référence XC9270
Description 30V Driver Transistor Built-In Step-Down DC/DC Converters
Fabricant Torex 
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XC9270 Datasheet, Description
XC9270/XC9271 Series
30V Driver Transistor Built-In Step-Down DC/DC Converters
ETR05048-001a
GENERAL DESCRIPTION
The XC9270/XC9271 series are 30V operation step-down DC/DC converter ICs with an internal driver transistor. The internal Nch driver
transistor is driven by bootstrap to achieve a stable, high-efficiency power supply up to an output current of 2.0A. Low ESR capacitors such as
ceramic capacitors can be used for the load capacitor (CL).
A 0.8V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.2V to 12.0V using external
resistors (RFB1, RFB2).
300kHz or 500kHz can be selected for the switching frequency. The generation of unneeded noise can be suppressed by synchronizing to an
external CLK in a range of ±25% of the free running frequency using the SYNC pin. In automatic PWM/PFM control, the IC operates by PFM
control when the load is light to achieve high efficiency over the full load range from light to heavy.
The soft start time can be set as desired by adding an external capacitance to the SS pin.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 4.5V or lower.
Internal protection circuits include over current protection, integral latch protection, short-circuit protection, and thermal shutdown circuits to
enable safe use.
APPLICATIONS
Car navigation systems
Car audios
Industrial equipment
FEATURES
Input Voltage
: 730V
FB Voltage
: 0.8V (±2)
Oscillation Frequency
: 300kHz, 500kHz
Maximum Output Current
: 2.0A
Control Method
: PWM (XC9270)
PWM/PFM (XC9271)
Soft-start
Protection Circuit
: External Capacitor
(set by external capacitor C)
: Over Current Protection 3.2A (TYP.)
Integral Latch Method (XC9270 / XC9271A)
Automatic Recovery (XC9270 / XC9271B)
Thermal Shutdown
Low ESR Ceramic Capacitor
: Ceramic Capacitor
Operating Ambient Temperature : -40~ +105
Package
: SOP-8FD
Environmentally Friendly
: EU RoHS Compliant, Pb Free
*Performance depends on external components and wiring on the PCB.
TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE
CHARACTERISTICS
XC9270x085/XC9271x085
(VIN=12V , VOUT=5V)
100
90
80
70
60
50
40
30
20
10
0
1
L=15μH(CLF12555-150M), CIN1=10μF(GRM32ER71H106KA12L),
SBD=CMS15, CL=22μF×2(GRM32ER71E226KE15L)
XC9271
XC9270
10 100 1000
Output Current :IOUT[mA]
10000
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XC9270 Fiche technique
BLOCK DIAGRAM (Continued)
3) XC9271 Series, Type A
XC9270/XC9271
Series
* Diodes inside the circuit are ESD protection diodes and parasitic diodes.
4) XC9271 Series, Type B
* Diodes inside the circuit are ESD protection diodes and parasitic diodes.
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3 Page

XC9270 pdf
XC9270/XC9271 Series
ELECTRICAL CHARACTERISTICS
XC9270A/B083
PARAMETER
FB Voltage
FB Voltage
Temperature Characteristics
Output Voltage
Setting Range
Operating Voltage Range
UVLO detect voltage
UVLO release voltage
Quiescent Current
Stand-by Current
Oscillation Frequency
External Clock Signal
Synchronized Frequency
External Clock Signal
Duty Cycle
Maximum Duty Cycle
Minimum Duty Cycle
Lx SW On Resistance
Current Limit (*2)
Latch Time
Short Detect Voltage
Internal Soft-start Time
External Soft-start Time
Efficiency (*3)
SYNC ‘H’ Voltage
SYNC ‘L’ Voltage
SYNC ‘H’ Current
SYNC ‘L’ Current
FB ‘H’ Current
FB ‘L’ Current
CE ‘H’ Voltage
CE ‘L’ Voltage
CE ‘H’ Current
CE ‘L’ Current
Thermal Shutdown Temperature
Hysteresis Width
SYMBOL
VFB1
VFB/
(ToprVFB)
VOUTSET
VIN
VUVLO1
VUVLO2
Iq
ISTB
fOSC
SYNCOSC
DSYNC
DMAX
DMIN
RLx
ILIM
tLAT
VSHORT
tSS1
tSS2
EFFI
VSYNCH
VSYNCL
ISYNCH
ISYNCL
IFBH
IFBL
VCEH
VCEL
ICEH
ICEL
TTSD
THYS
CONDITIONS
VFB=0.816V0.784V, VSS=6V,
VFB Voltage when Lx pin oscillates
-40℃≦Topr105
-
-
VIN=4.9V4.3V, VFB=0.65V, VSS=6V
VIN Voltage when Lx pin voltage changes from "H"
level to "L" level
VIN=4.7V5.3V, VFB=0.65V, VSS=6V
VIN Voltage when Lx pin voltage changes from "L"
level to "H" level
VIN=VCE=30V, VFB=0.95V
VIN=30V, VCE=0V, VSS=0V, VSYNC=0V
Connected to external components, IOUT=300mA
Connected to external components, IOUT=0mA
Connected to external components, IOUT=0mA
VFB=0.65V
VFB=0.95V
VFB=0.65V, VSS=6V
VFB=0.65V, VSS=6V
XC9270A series only
Connected to external components, VFB=0.65V, VSS=6V
XC9270B series only, Connected to external components,
VFB=0.45V0.35V, VSS=6V
VFB Voltage when Oscillation Frequency is decreased
VCE=012V, VSS=6V, VFB=VFB1×0.9V
Time until Lx pin oscillates
VCE=012V, VSS=6V, VFB=VFB1×0.9V, CSS=0.01μF
Time until Lx pin oscillates
Connected to external components, IOUT=1A
Connected to external components, IOUT=0mA
Connected to external components, IOUT=0mA
VIN=VCE=30V, VSYNC=6V, VFB=0.95V
VIN=VCE=30V, VSYNC=0V, VFB=0.95V
VIN=VCE=30V, VFB=6V, VSS=6V
VIN=VCE=30V, VFB=0V, VSS=6V
VCE=1.0V2.8V, VFB=0.65V, VSS=6V
VCE Voltage when Lx pin voltage changes from "L" level to "H"
VCE=2.8V1.0V, VFB=0.65V, VSS=6V
VCE Voltage when Lx pin voltage changes from "H" level to "L"
VIN=VCE=30V, VFB=0.95V
VIN=30V, VCE=0V, VFB=0.95V
Junction Temperature
Junction Temperature
MIN.
0.784
-
1.2 (*1)
7
4.3
4.7
-
-
276
fOSCx0.75
25
83
-
-
2.4
0.8
0.35
0.8
9
-
1.5
-
-0.1
-0.1
-0.1
-0.1
2.8
-
-0.1
-0.1
-
-
TYP.
0.8
±50
-
-
4.6
5.0
200
0.01
300
fOSC
-
85
-
0.3
3.2
1.3
0.40
1.3
15
91
-
-
0
0
0
0
-
-
0
0
150
25
MAX.
0.816
-
12
30
4.9
5.3
310
0.1
324
fOSCx1.25
75
88
0
-
-
1.8
0.45
2.0
24
-
6
0.4
0.1
0.1
0.1
0.1
30
1
0.1
0.1
-
-
UNITS
V
ppm/
V
V
V
V
μA
μA
kHz
kHz
%
%
%
A
ms
V
ms
ms
%
V
V
μA
μA
V
V
V
V
μA
μA
Ta=25
CIRCUIT
-
-
-
-
NOTE:
Unless otherwise stated, VIN=VCE=12V, VSYNC=2V, VSS=2V
External Components: Unless otherwise stated, L=22μH, CIN=10μF, CL=47μF, CBST=1μF, RFB1=2k, RFB2=390, CFB=10nF
(*1) Limited by a minimum ON time of 0.22μs (TYP.).
(*2) Current limit denotes the level of detection at peak of coil current.
(*3) EFFI=[(output voltage × output current)÷(inputvoltage × input current)]×100
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