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XC9271 Datasheet PDF - Torex

Part Number XC9271
Description 30V Driver Transistor Built-In Step-Down DC/DC Converters
Manufacturers Torex 
Logo Torex Logo 



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XC9271 datasheet, circuit
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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XC9271 equivalent
PIN ASSIGNMENT
PIN NUMBER
SOP-8FD
1
2
3
4
5
6
7
8
PIN NAME
VIN
CE
SYNC
FB
SS
GND
BST
Lx
FUNCTIONS
Power Input
Chip Enable
External CLK Sync Pin
Output Voltage Sense
Soft-start Adjustment
Ground
Bootstrap
Switching Output
XC9270/XC9271
Series
FUNCTION
PIN NAME
SIGNAL
STATUS
L Stand-by
CE H
Active
OPEN
Undefined State (*1)
SYNC
L
Operates with internal clock frequency
H
CLK Synchronizes with External Clock Signal
OPEN
Undefined State (*1)
(*1) Please do not leave the CE and SYNC pin open.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VIN Pin Voltage
BST Pin Voltage
FB Pin Voltage
SYNC Pin Voltage
CE Pin Voltage
SS Pin Voltage
Lx Pin Voltage
Lx Pin Current
Power Dissipation
Surge Voltage
Operating Ambient Temperature
Storage Temperature
SYMBOL
VIN
VBST
VFB
VSYNC
VCE
VCSS
VLx
ILx
Pd
VSURGE
Topr
Tstg
RATINGS
-0.3 +36
-0.3 or VLX-0.3 (*1) VLX+6.5 or +36 (*2)
-0.3 +6.5
-0.3 +6.5
-0.3 +36
-0.3 +6.5
-0.3 VIN+0.3 or +36 (*3)
4.2
300
1500 (PCB mounted)
46 (*4)
-40 +105
-55 +125
* All voltages are described based on the GND pin.
(*1) The minimum value should be either -0.3 or VLX-0.3 in the highest.
(*2) The maximum value should be either VLX+6.5 or +36 in the lowest.
(*3) The maximum value should be either VIN+0.3 or +36 in the lowest.
(*4) Applied Time400ms
Ta=25
UNITS
V
V
V
V
V
V
V
A
mW
V
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Information Total 27 Pages
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