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PDF XC9266 Data sheet ( Hoja de datos )
| Número de pieza | XC9266 | |
| Descripción | 6.0A Synchronous Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XC9266 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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XC9266 Series
ETR05051-001
COT Control, 6.0A Synchronous Step-Down DC/DC Converters
■GENERAL DESCRIPTION
☆Green Operation-compatible
The XC9266 series is a group of synchronous-rectification type DC/DC converters with a built-in 32mΩ P-channel MOS driver
transistor and 25mΩ 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 6.0A. 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. PWM control or PWM/PFM auto switching control can be selected at the MODE1 pin, and a
high-speed response, low ripple, and high efficiency are achieved across the entire load range (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. The soft start time can be set as desired by adding an external capacitance to the SS
pin. Internal protection circuits include over current protection, short-circuit protection, and thermal shutdown circuits to enable safe
use. Short circuit protection or Hiccup mode can be selected at the MODE2 pin.
Soft-off function and CL High Speed discharge function discharge the electric charge at the output capacitor CL when putting the IC
in a stand-by mode. Soft-off function can be selected at the MODE3 pin. The package is the QFN0404-24C (4mm×4mm).
(*) HiSAT-COT is an original Torex term for High Speed Transient Response.
■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 Circuits
Functions
Capacitor
Operating Ambient Temperature
Package
Environmentally Friendly
: 2.7V～5.5V
: 0.8V～3.6V
: 0.6V±1.0%
: 6.0A
: 1.2MHz, 3.0MHz
: 93%(VIN=5.0V, VOUT=1.8V, IOUT=1.0A)
: HiSAT-COT Control
100% Duty Cycle
Mode select between
Fixed PWM and PWM/PFM Auto
: Thermal Shutdown
Current Limit (Pendent character)
HICCUP or Short Circuit Protection
: UVLO , Soft-Start, Soft-off
CL High Speed Discharge
: Ceramic Capacitor
: - 40℃ ～ + 105℃
: QFN0404-24C
: EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT
VIN
RDD
CIN
CDD CSS
PVIN
AVIN
CE
MODE1
MODE2
MODE3
PG
VOU T
Lx
FB
SS
AGND
PGND
RPG
L
CFB
VOUT
RFB1
CL
RFB2
■TYPICAL PERFORMANCE
CHARACTERISTICS
XC9266B06C VOUT=1.8V, fosc=1.2MHz L=0.56μH(XAL6030),
CIN=47μF(GRM31CR61A476ME15L),CL=47μF(GRM31CR60J476ME19L),RFB1=36kΩ,RFB2=18kΩ,CF
100
80
60
40
20
0
1
PWM/PFM
VIN =5.0V
PWM
10 100 1000 10000
Output Current : IOUT (mA)
1/30
1 page  
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
Power Input Voltage
Analog Input Voltage
Lx PIN Voltage
Output Voltage
Feedback Input Voltage
CE Input Voltage
MODE1 Input Voltage
MODE2 Input Voltage
MODE3 Input Voltage
PG Input Voltage
Soft Start Input Voltage
Power
Dissipation
QFN0404-24C
Operating Ambient Temperature
VPVIN
VAVIN
VLx
VOUT
VFB
VCE
VMODE1
VMODE2
VMODE3
VPG
VSoftStart
Pd
Topr
-0.3～+6.2
-0.3～VIN+0.3 or+6.2(*1)
-0.3～VIN+0.3 or+4.0(*2)
-0.3～+6.2
-0.3～+6.2
-0.3～+6.2
-0.3～+6.2
-0.3～+6.2
-0.3～+6.2
-0.3～VIN+0.3 or +6.2(*1)
1500 (PCB mounted)
-40～+105
Storage Temperature
Tstg
-55～+125
All voltages are described based on the GND (AGND and PGND) pin.
(*1) The maximum value should be either VIN+0.3V or +6.2V in the lowest.
(*2) The maximum value should be either VIN+0.3V or +4.0V in the lowest.
Ta=25℃
UNITS
V
V
V
V
V
V
V
V
V
V
mW
℃
℃
XC9266
Series
5/30
5 Page 
XC9266
Series
■OPERATIONAL EXPLANATION
The XC9266 series consists of a reference voltage source, error amplifier, comparator, phase compensation, minimum on time
generation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS switching transistor for
the synchronous switch, current limiter circuit, UVLO circuit, thermal shutdown circuit, short protection circuit, PWM/PFM
selection circuit and others. (See the BLOCK DIAGRAM below.)
VOUT
FB
SS
CE
MODE1
MODE2
MODE3
Phase
Compensation
Error Amp.
+
-
Comparator
-
+
Short
Protection
SQ
R
Vref with
Soft Start
Logic,
CE Control
UVLO,
Thermal Shutdown
CL Auto-Discharge
Minimum
On Time
Generator
PVIN
VOUT
Logic
Current Limit
HICCUP
Synch.
Buffer
Driver
PWM/PFM
Selector
Power Good
Comparator
-
FB +
PVIN
Lx
PGND
AVIN
AGND
PG
BLOCK DIAGRAM (XC9266 Series Type B)
The method is HiSAT-COT (High Speed circuit Architecture for Transient with Constant On Time) control, which features on time
control method and a fast transient response that also achieves low output voltage ripple.
The on time (ton) is determined by the input voltage and output voltage, and turns on the Pch MOS driver Tr. for a fixed time.
During the off time (toff), the voltage is generated by resistor division with resistors RFB1 and RFB2. The voltage is compared to the
reference voltage by the error amp, and the error amp output is phase compensated and sent to the comparator. The comparator
compares this signal to the reference voltage, and if the signal is lower than the reference voltage, sets the SR latch. On time then
resumes. By doing this, PWM operation takes place with the off time controlled to the optimum duty ratio and the output voltage
is stabilized. The phase compensation circuit optimizes the frequency characteristics of the error amp, and generates a ramp
wave similar to the ripple voltage that occurs in the output to modulate the output signal of the error amp. This enables a stable
feedback system to be obtained even when a low ESR capacitor such as a ceramic capacitor is used, and a fast transient response
and stabilization of the output voltage are achieved.
< Minimum on time generation circuit >
Generates an on time that depends on the input voltage and output voltage (ton). The on time is set as given by the equations
below.
fOSC=1.2MHz
ton (μs)=VOUT/VIN×0.833
fOSC=3.0MHz
ton (μs)=VOUT/VIN×0.333
< Switching frequency >
The switching frequency can be obtained from the on time (ton), which is determined by the input voltage and output voltage, and
the PWM controlled off time (toff) as given by the equation below.
fOSC (MHz) = VOUT(V) / (VIN(V)×ton(μs))
<100% duty cycle mode >
When the load current is heavy and the voltage difference between input voltage and output voltage is small, 100% duty cycle
mode is activated and it keeps the Pch MOS driver Tr. keep on. 100% duty cycle mode attains a high output voltage stability and
a high-speed response under all load conditions, from light to heavy, even in conditions where the dropout voltage is low.
11/30
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9266.PDF ] | |
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