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XC9274 Datasheet Preview

XC9274 Datasheet

Step-Down DC/DC Converter

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XC9274/XC9275 Series
ETR05056-003
HiSAT-COT® Control 3.0A Synchronous Step-Down DC/DC Converters
GENERAL DESCRIPTION
Green Operation-compatible
The XC9274/XC9275 series is a group of synchronous-rectification type DC/DC converters with a built-in 51mΩ P-channel
MOS driver transistor and 49mΩ N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. The
small on-resistances of these two internal driver transistors enable a high efficiency, stable power supply with an output current
up to 3.0A. A 0.6V reference voltage source is incorporated, and the output voltage can be set freely by external resistors.
Oscillation frequency is set to 1.2MHz or 3.0MHz can be selected for suiting to your particular application. The operation mode
is HISAT-COT(*) control , which has an excellent transient response, the XC9274 series is PWM control, the XC9275 series is
PWM/PFM auto switching control, allowing fast response, low ripple, and high efficiency over the full range of loads (from light
loads to heavy loads).
During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. As for the soft-start
function as fast as 0.25ms in typical for quick turn-on. Internal protection circuits include over current protection, short-circuit
protection, and thermal shutdown circuits to enable safe use. Short-circuit protection is available only for B,C type. Hiccup mode
is available only for D,E type. Soft-off function is available only for B, D type. The package is the SOP-8FD.
(*) HiSAT-COT is a proprietary high-speed transient response technology for DC/DC converter which was developed by Torex. It is Ideal for the
LSI's that require high precision and high stability power supply voltage
APPLICATIONS
PC
Graphic board
Storage
Industrial application
FPGA
SSD
ASIC
DSP
FEATURES
Input Voltage Range
Output Voltage Range
FB Voltage
Output Current
Oscillation Frequency
Efficiency
Control Methods
Protection
Functions
Output Capacitor
Operating Ambient Temperature
Package
Environmentally Friendly
: 2.7V ~ 5.5V
: 0.8V ~ 3.6V
: 0.6V ± 1.0%
: 3.0A
: 1.2MHz, 3.0MHz
: 95% (VIN=5.0V, VOUT=3.3V, IOUT=1.0A)
: HiSAT-COT® Control
: 100% Duty Cycle
: PWM Control (XC9274)
: PWM/PFM auto switching Control (XC9275)
: Thermal Shutdown
: Current Limit (Pendent character)
: HICCUP (D,E Type)
Short Circuit Protection (B,C Type)
: UVLO, Soft-Start
: Soft-off (B,D Type)
: CL High Speed Discharge
: Ceramic Capacitor
: -40~ 105
: SOP-8FD
: EU RoHS Compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
VIN
PVIN
PG
VOUT
CE
Lx
CIN
FB
AGND PGND
RPG
L
CFB
VOUT
RFB1
CL
RFB2
TYPICAL PERFORMANCE
CHARACTERISTICS
VOUT=3.3V, fosc=1.2MHz L=0.82μH(MWSA6030),CIN=47μF(GRM31CR61A476ME15L)
CL=47μF(GRM31CR60J476ME19L),RFB1=68kΩ,RFB2=15kΩ,CFB=820pF
100
90
80
70
60
50
40
30
20
10
0
1
XC9275
10
VIN = 5.0V
XC9274
100
1000
10000
Output Current : IOUT (mA)
1/27




Torex

XC9274 Datasheet Preview

XC9274 Datasheet

Step-Down DC/DC Converter

No Preview Available !

XC9274/XC9275 Series
BLOCK DIAGRAM
1) XC9274/XC9275
VOUT
FB
CE
Phase
Compensation
Error Amp.
+
-
Comparator
-
+
Short
Protection
SQ
R
Vref with
Soft Start
FUNCION selector
Minimum
On Time
Generator
VIN
VOUT
   CE Control
    UVLO,
   Thermal Shutdown
   CL Auto-Discharge
SOFT - OFF
Logic
Current Limit
Hiccup
Synch.
Buffer
Driver
PWM/PFM
Selector
Power Good
Comparator
-
FB +
* In the XC9274 series "PWM / PFM Selector" is fixed to PWM control.
In the XC9275 series "PWM / PFM Selector" is fixed to PWM / PFM automatic switching control.
For Hiccup, Short Protection, Soft-off, the available functions are different for each product type.
Please refer to Selection Guide for functions available for each product type.
Diodes inside the circuit are an ESD protection diode and a parasitic diode.
VIN
Lx
PGND
AGND
PG
2/27



Part Number XC9274
Description Step-Down DC/DC Converter
Maker Torex
Total Page 3 Pages
PDF Download

XC9274 Datasheet PDF





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