30V / 2A Buck DC/DC converter with a built-in driver transistor
New Product Leaflet
XC9270/XC9271 Series
GPS
Maesuring
Major
Navigation machinesiro appliance
The XC9270/XC9271 series are high-withstand voltage DC/DC converters with 30V
operation, 2A output, and an internal driver Tr.
With an input voltage of 30V, input rating of 36V, peak voltage of 46V - 400ms, and an
operating ambient temperature range of -40℃ to +105℃, this series is ideal for car
accessories and industrial equipment applications.
By synchronizing to an external clock, unwanted noise can be reduced. A latch type or
auto reset type can be selected for the current limiting function, and a thermal shutdown
circuit is also incorporated to enable safer circuit design.
SOP-8FD
(6.0mm×4.9mm×1.55mm)
SALES
1
The frequency can be adjusted using the frequency synchronization function
Synchronization
function
XC9270/XC9271 series has the synchronization function with an external CLK.
It can synchronize with the CLK within +/-25% of an internal CLK using SYNC pin.
Frequency range
for Synchronization
300kHz type : 225kHz ～ 375kHz
500kHz type : 375kHz ～ 625kHz
VIN
BST
CBST
CIN
L
CE
Lx
SBD
Input an external CLK to SYNC
pin. The IC frequency varies to
match the external CLK frequency.
RBF1
CFB1
SS
FB
CL
CSS
RBF2
SYNC
GND
Synchronized waveform for 500kHz type
Red line: Lx pin (1V/div) Light blue: SYNC pin (1V/div) CLK: 375kHz ～ 625kHz
625kz
375kz
625kHz
375kHz
625kHz
375kHz
Time: 1μs/div
Time: 1μs/div
Features
Input Voltage Range
7.0V～30V
Control Method
PWM(XC9270), PWM/PFM(XC9271)
Load Dump Transients
46V, 400ms (TBD)
Adjustable with external cap. (Min. 1.0ms)
FB Voltage
Operating Ambient Temp.
0.8V±2%
-40℃～+105℃
Soft-start Function
Ext. Synchronization
Protection Circuit
Over current protection, Thermal shutdown
Package
±25% of the oscillationfrequency
Quiescent Current
200μA (300kHz)
Automatic recovery (Type B)
Oscillation Frequency
300kHz, 500kHz (±8%)
Max. Output Current
2.0A
Integral latch method (Type A)
SOP-8FD
www.torex.co.jp/english
March 2014
● Values shown in this sheet can be changed without any prior notice.
New Product Leaflet
30V/2A Buck DC/DC converter with a built-in driver transistor XC9270/XC9271 Series
SALES
The internal driver Tr. contributes to space saving
2
TOREX Synchronous Controller
Complex
XC9270/XC9271
Simple
VIN
GND
CE
BST
CIN
CBST
L
SS
Lx
SBD
CSS
CFB
SYNC
RFB1
FB
CL
RFB2
Small Space
28mm
44mm
XC9270/XC9271
31mm
44mm
◆The driver Tr. is incorporated to reduce peripheral components and decrease mounting space!
◆SBD is used for the rectifier circuit, also it can dissipate the heat outside of IC.
◆PKG is SOP-8FD
SALES
High efficiency even at light loads
3
Efficiency (PFM/PWM Auto Control vs. PWM Control)
f=500kHz, VIN=12V, VOUT=5.0V, IOUT=2.0A
PFM/PWM Auto Control
Effic ienc y : EF F I (% )
100
90
80
High Efficiency at
Light Load
70
60
PFM control can be selected
50
40
PWM Control
The stand-by power consumption
of a system can be improved.
30
20
10
0
1
10
100
1000
10000
Output Current : IOUT (mA )
www.torex.co.jp/english
March 2014
● Values shown in this sheet can be changed without any prior notice.