XC9280 Series
18V Operation 3.0A Synchronous Step-Down DC/DC Converters
ETR05064-003
■GENERAL DESCRIPTION
The XC9280 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors,
the operating voltage range is 4.5V~18.0V, designed to allow the use of ceramic capacitors.
0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.8V to 7.0V using
external resistors (RFB1, RFB2).
Switching frequency is 1.2MHz. In PWM/PFM automatic switchover control, IC can change the control method between PWM
and PFM based on the output current requirement and as a result IC can achieve high efficiency over the full load range.
XC9280 has a fixed internal soft start time which is 0.95ms (TYP.), additionally the time can be extended by using an external
resistor and capacitor.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage goes down to 3.33V (TYP.) or lower.
Over current protection and thermal shutdown are embedded and they secure a safety operation.
■APPLICATIONS
■FEATURES
● Digital TV
Input Voltage Range
:
4.5V ~ 18V (Absolute Max 20V)
● Set Top Box
Output Voltage Range
:
1.8V ~ 7.0V or VIN x 0.7
● Security camera
FB Voltage
:
0.75V±1.5%
● Smart meter
Oscillation Frequency
:
1.2MHz
Output Current
:
3A peak
● Security system
2.0A DC (VIN=12V, VOUT=5V)
Control Method
:
PWM/PFM Automatic
Soft-start Time
:
0.95ms
Protection function
:
UVLO
Over Current Protection
(Automatic Recovery)
Thermal Shutdown
Output Capacitor
:
Ceramic Capacitor
Package
:
TSOT-26
Environmentally Friendly
:
EU RoHS Compliant, Pb Free
Adjustable by RC
■TYPICAL APPLICATION CIRCUIT
VIN
BST
CIN
(ceramic)
CBST
EN/SS
L
Lx
CFB
GND
■TYPICAL PERFORMANCE
CHARACTERISTICS
RFB1
FB
RFB2
CL
(ceramic)
1/28
XC9280 Series
■BLOCK DIAGRAM
VIN
Local
Reg
EN
EN/SS
UVLO
Control
Logic
BST
Control
Switch
Current
Feedback
Thermal
Shutdown
Current
Limit
Nch
Highside
DRV Tr.
Current
Limit PFM
Soft
Start
VREF
+
-
Output
Buffer
LX
ERR
AMP
Phase Compensation
PWM
Comparator
PWM/PFM
Control Logic
Nch
Lowside
DRV Tr.
Ramp Wave
Generator,
OSC
FB
GND
* Diodes inside the circuit are an ESD protection diodes and a parasitic diodes.
■PRODUCT CLASSIFICATION
1) Ordering Information
XC9280①②③④⑤⑥-⑦(*1)
DESIGNATOR
ITEM
SYMBOL
DESCRIPTION
①
Type
A
Refer to Selection Guide
②③
FB Voltage
75
0.75V
④
Oscillation
Frequency
C
1.2MHz
Packages
(Order Unit)
YR-G(*1)
TSOT-26 (3,000pcs/Reel)
⑤⑥-⑦
(*1)
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
2) Selection Guide
2/28
BST
TYPE
Chip Enable
UVLO
Thermal
Shutdown
A
Yes
Yes
Yes
TYPE
Soft Start
Current
Limiter
Automatic Recovery
(Current Limiter)
A
Yes
Yes
Yes
XC9280
Series
■PIN CONFIGURATION
BST
EN/SS
FB
6
5
4
1
2
3
GND
LX
VIN
TSOT-26
(TOP VIEW)
■PIN ASSIGNMENT
PIN NUMBER
FUNCTIONS
TSOT-26
PIN
NAME
1
GND
Ground
2
LX
Switching Output
3
VIN
Power Input
4
FB
Output Voltage Sense
5
EN/SS
Enable/Soft-start
6
BST
Bootstrap
■FUNCTION CHART
PIN NAME
EN/SS
(*1)
SIGNAL
STATUS
H
Active
L
Stand-by
OPEN
Undefined State (*1)
Please do not leave the EN/SS pin open. Each should have a certain voltage.
3/28
XC9280 Series
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
(*2)
RATINGS
UNITS
VIN Pin Voltage
VIN
-0.3 ~ 20
V
EN/SS Pin Voltage
VEN/SS
-0.3 ~ 20
V
FB Pin Voltage
VFB
-0.3 ~ 6.2
V
BST Pin Voltage
VBST
VLX - 0.3 ~ VLX + 6.2
V
VLx
Lx Pin Current
ILx
6.0
A
Pd
1300 (High heat dissipation board) (*2)
mW
Operating Ambient Temperature
Topr
-40 ~ 105
℃
Storage Temperature
Tstg
-55 ~ 125
℃
TSOT-26
-0.3 ~ VIN + 0.3 or 20
(*1)
Lx Pin Voltage
Power Dissipation
(Ta=25℃)
(*1)
SYMBOL
The maximum value should be either VIN+0.3V or 20V in the lowest.
The power dissipation figure shown is PCB mounted and is for reference only.
The mounting condition is please refer to PACKAGING INFORMATION.
4/28
V
XC9280
Series
■ELECTRICAL CHARACTERISTICS
Ta=25℃
PARAMETER
SYMBOL
FB Voltage
VFB
Setting Output Voltage
Range(*1)
Operating Input Voltage
Range(*1)
CONDITIONS
VFB=0.761V → 0.739V
VFB Voltage when Lx pin oscillates
MIN.
TYP.
MAX.
UNIT
CIRCUIT
0.739
0.750
0.761
V
①
V
-
7.0 or
VOUTSET
-
1.8
-
VIN
-
4.5
-
18
V
-
2.70
3.33
-
V
①
-
3.38
4.40
V
①
VIN=VEN/SS=12V、VFB=0.825V、VLX=0V
-
80
180
μA
②
VIN=12V、VEN/SS=VFB=VLX=0V
-
3.0
6.0
μA
⑤
1.0
1.2
1.4
MHz
①
75
90
-
%
①
VINx0.7(*4)
VIN:4.4V→2.7V、VFB=0.675V
UVLO Detect Voltage
VUVLOD
VIN Voltage which Lx pin voltage
changes from "oscillation" to "L" level
VIN:2.7V→4.4V、VFB=0.675V
UVLO Release Voltage
VUVLOR
VIN Voltage which Lx pin voltage
changes from "L" level to "oscillation"
Quiescent Current
Iq
Stand-by Current
ISTBY
Connected to external components,
Oscillation Frequency
fOSC
Maximum Duty Cycle
DMAX
Lx SW "H" On Resistance
RLxH
-
-
166(*2)
-
mΩ
-
Lx SW "L" On Resistance
RLxL
VFB=5.5V、ILX=100mA
-
130
-
mΩ
③
Lx SW "H" Off Current
ILXH
-1.0
-
-
μA
⑥
Lx SW "L" Off Current
ILXL
-
-
1.0
μA
⑧
-
1.2
-
A
④
VIN=VEN/SS=6.0V、VFB=0.675V
Connected to external components,
VIN=VEN/SS=6.0V、VFB=0.675V
VIN=18V、VEN/SS=0V、VFB=1.5V
VLX=6.0V、VBST=VLX+5.0V
VIN=18V、VEN/SS=VFB=VLX=0V
Connected to external components,
PFM Switch Current
IPFM
Current Limit
ILIM
-
-
5.1
-
A
-
Internal Soft-Start Time
tSS1
VFB=0.675V
-
0.95
-
ms
①
-
26
-
ms
⑦
-
90
-
%
④
-
±100
-
ppm/℃
①
External Soft-Start Time
tSS2
Efficiency(*3)
EFFI
FB Voltage
ΔVFB/
Temperature Characteristics
(ΔTopr・VFB)
VIN=12V、VOUT=5.0V、IOUT=1mA
VFB=0.675V
RSS=430kΩ、CSS=0.47μF
Connected to external components,
VIN=12V、VOUT=5.0V、IOUT=1.0A
-40℃≦Topr≦105℃
Test Condition: Unless otherwise stated, VIN=12V, VEN/SS=12V
(*1):
(*2)
Please use within the range of VOUT/VIN≧0.136
: Design reference value. This parameter is provided only for reference.
(*3):
EFFI = {(output voltage) x (output current)} / {(input voltage) x (input current)} x 100
(*4):
The maximum value should be either 7.0 or VINx0.7 in the lowest.
5/28
XC9280 Series
■ELECTRICAL CHARACTERISTICS
Ta=25℃
PARAMETER
SYMBOL
FB “H” Current
IFBH
CONDITIONS
MIN.
TYP.
MAX.
UNIT
CIRCUIT
VIN=VEN/SS=18V、VFB=3.0V、VLX=0V
-0.1
-
0.1
μA
⑧
FB “L” Current
IFBL
VIN=VEN/SS=18V、VFB=VLX=0V
-0.1
-
0.1
μA
⑧
EN/SS “H” Voltage
VEN/SSH
VIN=18V、VFB=0.71V
2.5
-
18
V
①
EN/SS “L” Voltage
VEN/SSL
VIN=18V、VFB=1.5V
-
-
0.3
V
①
EN/SS “H” Current
IEN/SSH
VIN=VEN/SS=18V、VFB=1.5V、VLX=0V
-
0.1
0.3
μA
⑧
EN/SS “L” Current
IEN/SSL
VIN=18V、VEN/SS=VFB=VLX=0V
-0.1
-
0.1
μA
⑧
Thermal Shutdown
Temperature
Hysteresis Width
TTSD
Junction Temperature
-
150
-
℃
-
THYS
Junction Temperature
-
10
-
℃
-
Test Condition: Unless otherwise stated, VIN=12V, VEN/SS=12V
6/28
XC9280
Series
■TEST CIRCUITS
CIRCUIT①
CIN=10μF 2parallel
LX pulse
CL=22μF 2parallel
CBST=0.1μF
A
L=3.3μH
VIN
BST
EN/SS
CBST
Lx
L
FB
CL
CIN
500Ω
GND
CIRCUIT②
A
VIN
BST
EN/SS
0.1μ F
Lx
A
FB
A
GND
CIRCUIT③
VIN
BST
EN/SS
0.1μ F
Lx
FB
GND
V
ILX
7/28
XC9280 Series
■TEST CIRCUITS(Continued)
CIN=10μF 2parallel
CL=22μF 2parallel
CIRCUIT④
CBST=0.1μF
L=3.3μH
A
CFB=56pF
VIN
RFB1=220kΩ
BST
EN/SS
RFB2=39kΩ
CBST
Lx
L
CFB
RFB1
FB
CL
CIN
RFB2
GND
IOUT
CIRCUIT⑤
A
VIN
BST
EN/SS
0.1μ F
Lx
FB
GND
CIRCUIT⑥
A
VIN
BST
EN/SS
0.1μ F
Lx
A
FB
A
GND
8/28
A
XC9280
Series
■TEST CIRCUITS(Continued)
CIN=10μF 2parallel
CIRCUIT⑦
CL=22μF 2parallel
CBST=0.1μF
LX pulse
L=3.3μH
RSS=430kΩ
CSS=0.47μΩ
VIN
BST
CBST
RSS
EN/SS
Lx
L
FB
CL
CIN
CSS
500Ω
GND
CIRCUIT⑧
A
VIN
BST
EN/SS
0.1μ F
Lx
A
FB
A
A
GND
9/28
XC9280 Series
■TYPICAL APPLICATION CIRCUIT
VIN
BST
CIN
(ceramic)
CBS T
EN/SS
L
CFB
GN D
VOUT
Lx
RFB1
FB
CL
(ceramic)
RFB2
VOUT
MANUFACTURER
5.0V ~ 7.0V
TDK
1.8V ~ 4.9V
TDK
-
TDK
3.3V ~ 7.0V
TDK
1.8V ~ 3.2V
TDK
-
-
PRODUCT NUMBER
VLS5045EX-3R3N
VLS5045EX-2R2N
2.2μH
CLF7045NIT-2R2N
CL
CBST
3.3μH
CLF7045NIT-3R3N
L
CIN
VALUE
C2012X5R1E106K
10μF/25V 2Parallel
C3216X7R1E106K
10μF/25V 2Parallel
C3216X5R1E226M
22μF/25V 2Parallel
C4532X7R1E226M
22μF/25V 2Parallel
C3216X5R1E226M
22μF/25V 3Parallel
C4532X7R1E226M
22μF/25V 3Parallel
-
0.1μF/25V
The output voltage can be set by adding an external dividing resistor.
The output voltage is determined by the equation below based on the values of RFB1 and RFB2.
VOUT=0.75×(RFB1+RFB2)/RFB2
With RFB2≦50kΩ
Adjust the value of the phase compensation speed-up capacitor CFB using the equation below.
C FB
1
2 fzfb RFB1
When VOUT=3.3V~7.0V, a target value for fzfb of about 10k~15kHz is optimum.
When VOUT=1.8V~3.2V, a target value for fzfb of about 30k~35kHz is optimum.
【Setting Example】
VOUT setting= 5.0V, RFB1=220kΩ, RFB2=39kΩ
VOUT=0.75V×(220kΩ+39kΩ) / 39kΩ =5.0V
fzfb=12.9kHz
CFB= 1/(2×π×12.9kHz×220kΩ) =56pF
【examples】
VOUT
RFB1
RFB2
CFB
5.0V
220kΩ
39kΩ
56pF
3.3V
91kΩ
27kΩ
120pF
1.8V
51kΩ
36kΩ
100pF
10/28
XC9280
Series
■TYPICAL APPLICATION CIRCUIT (Continued)
＜Soft-start Time Setting＞
The soft-start time can be adjusted by adding a capacitor and a resistor to the EN/SS pin.
Soft-start time (tss2) is approximated by the equation below according to values of V EN/SS, RSS, and CSS.
tss2=Css × Rss × ( ln( VEN/SS/(VEN/SS-1.45) ) )
【Setting Example】
CSS=0.47μF, RSS=430kΩ, VEN/SS=12V
tSS2=0.47x10-6 x 430x103 x (ln(12/(12-1.45) ) )=26ms
* The soft-start time is the time from the start of VEN/SS until the output voltage reaches 90% of the set voltage.
If the EN/SS pin voltage rises without connecting CSS and RSS (RSS=0Ω), Output rises with taking
the soft-start time of tss1=0.95ms (TYP.) which is fixed internally.
VEN/SS
RSS
EN/SS
VEN/SS
CSS
90 % of se tting voltage
VOUT
tSS1
tSS2
11/28
XC9280 Series
■OPERATIONAL EXPLANATION
The XC9280 series consists of a reference voltage source circuit, soft-start circuit, error amplifier circuit, PWM comparator
circuit, PWM/PFM control circuit, ramp wave circuit、oscillator (OSC) circuit、phase compensation (Current feedback) circuit,
current limit circuit, current limit PFM circuit, Nch High-side driver Tr.,Nch Low-side driver Tr.,output buffer circuit, internal power
supply (LocalReg) circuit, under-voltage lockout (UVLO) circuit,、BST control circuit, thermal shutdown (TSD) circuit、control
logic circuit .
The voltage feedback from the FB pin is compared to the internal reference voltage by the error amp, the output from the error
amp is phase compensated, and the signal is input to the PWM comparator to determine the ON time of switching during PWM
operation. The output signal from the error amp is compared to the ramp wave by the PWM comparator, and the output is sent
to the buffer drive circuit and output from the LX pin as the duty width of switching. This operation is performed continuously to
stabilize the output voltage.
The driver transistor current is monitored at each switching by the phase compensation (Current feedback) circuit, and the
output signal from the error amp is modulated as a multi-feedback signal. This allows a stable feedback system to be obtained
even when a low ESR capacitor such as a ceramic capacitor is used, and this stabilizes the output voltage.
VIN
Local
Reg
EN
EN/SS
UVLO
Control
Logic
BST
Control
Switch
Current
Feedback
Thermal
Shutdown
Current
Limit
Nch
Highside
DRV Tr.
Current
Limit PFM
VREF
Soft
Start
+
-
Output
Buffer
PWM
Comparator
FB
LX
ERR
AMP
Phase Compensation
PWM/PFM
Control Logic
BST
Nch
Lowside
DRV Tr.
Ramp Wave
Generator,
OSC
GND
* Diodes inside the circuits are ESD protection diodes and parasitic diodes.
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.
The ramp wave circuit determines switching frequency (1.2MHz).
Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation.
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage divided by the internal voltage divider, RFB1 and RFB2. When a voltage is lower than the reference voltage, then the
voltage is fed back, the output voltage of the error amplifier increases. The error amplifier output is fixed internally to deliver an
optimized signal to the mixer.
12/28
XC9280
Series
■OPERATIONAL EXPLANATION (Continued)
< Current limiting, Short-circuit protection >
The XC9280 series incorporates a foldback circuit for current limiting and short-circuit protection.
When the output current reaches the current limit, the output voltage falls and the output current is limited.
When the overcurrent condition is canceled, the output voltage automatically recovers.
The output voltage is soft-started by soft-starting the reference voltage.
The rise time of this reference voltage is the soft start time.
The soft-start time is set to 0.95ms (TYP.) which is fixed internally or to the time set by adding a capacitor and a resistor to the
EN/SS pin whichever is later.
The thermal shutdown (TSD) as an over temperature limit is built in the XC9280 series.
When the junction temperature reaches the detection temperature, the driver transistor is forcibly turned off. When the junction
temperature falls to the release temperature while in the output stop state, restart takes place by soft-start 0.95ms (TYP.).
This is a function to monitor the internal power supply and to prevent the output of false pulses from the Lx pin when the output
from the internal power supply is unstable at low voltages.
As the VIN pin voltage goes down, the internal power supply voltage falls. So the V IN voltage drops, the UVLO function is
activated.
When the VIN pin voltage falls below VUVLOD (TYP. 3.33V), the driver transistor is forcibly turned off to prevent false pulse output
due to instable operation of the internal circuits. When the V IN pin voltage rises above VUVLOR (TYP. 3.38V), the UVLO function is
released, the soft-start function activates, and output start operation begins. Stopping by UVLO is not shutdown; only pulse
output is stopped and the internal circuits continue to operate.
When the VIN pin voltage falls below VUVLOD (TYP. 3.33V), the UVLO function is activated.
13/28
XC9280 Series
■NOTE ON USE
1)
1)
For the phenomenon of temporal and transitional voltage decrease or voltage increase,
the IC may be damaged or deteriorated if IC is used beyond the absolute MAX. specifications.
2)
Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter.
These are greatly influenced by external component selection, such as the coil inductance,
capacitance values, and board layout of external components.
Once the design has been completed, verification with actual components should be done.
3)
Make sure that the absolute maximum ratings of the external components and of this IC are not exceeded.
4)
The DC/DC converter characteristics depend greatly on the externally connected components as well as on the
characteristics of this IC, so refer to the specifications and standard circuit examples of each component
when carefully considering which components to select. Be especially careful of the capacitor characteristics and
use B characteristics (JIS standard) or X7R, X5R (EIA standard) ceramic capacitors. The capacitance decrease caused
by the bias voltage may become remarkable depending on the external size of the capacitor.
5)
The ripple voltage could be increased when switching from discontinuous conduction mode to Continuous conduction
mode. Especially when the input / output potential difference voltage is low, the ripple voltage may increase.
Please evaluate IC well on customer’s PCB.
6)
If the voltage at the EN/SS Pin does not start from 0V but it is at the midpoint potential when the power is switched on,
the soft-start function may not work properly and it may cause the larger inrush current.
7)
The actual coil current may exceed the current limit value due to internal propagation delay.
8)
When the voltage difference between input voltage and output voltage is low, the load regulation may be deteriorated
by being limited by MAXDUTY.
9)
In order to drive the IC normally, supply a stable input voltage to the V IN pin after reducing the AC impedance due to the
bypass capacitor. In particular, if the amplitude of the input voltage fluctuates by 7V or more and ±0.4V/μs or more, there is a
possibility that the UVLO function malfunctions due to fluctuations of the internal power supply of the IC.
In that case, switching is stopped in a protected state that prevents false pulse output from the Lx pin. After that, the soft start
function gets started, it shifts to normal operation.
If the input voltage fluctuates momentarily, take measures such as increasing the input capacitance.
10)
Torex places an importance on improving our products and their reliability. We request that users incorporate
fail-safe designs and post-aging protection treatment when using Torex products in their systems.
14/28
XC9280
Series
■NOTE ON USE (Continued)
10)
Instructions of pattern layouts The operation may become unstable due to noise and/or phase lag from the output current
when the wire impedance is high, please place the input capacitor(CIN) and the output capacitor (CL) as close to the IC as
possible.
(1) In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible
to the VIN and GND pins.
(2) Please mount each external component as close to the IC as possible.
(3) Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit
impedance.
(4) Make sure that the GND traces are as thick as possible, as variations in ground potential caused by high ground
currents at the time of switching may result in instability of the IC.
(5) Please note that internal driver Tr. bring on heat because of the load current and ON resistance of High-side
driver Tr., Low-side driver Tr..
(6)
Please note that Tj should be lower than 125℃.
If it exceeds the value calculated from the following calculation formula, the thermal shutdown will operate due to the
heat generation of the IC due to safety.
Reference Pattern LayoutθJA= 64[℃/W]
Calculated values may not match actual operation depending on usage environment, usage conditions,
transient conditions, etc.
Please evaluate IC well on customer’s PCB.
＜DC Maximum Output Voltage vs. Operating Ambient Temperature＞
P_loss=VOUT×IOUT×(1/EFFI-1)[W]
θJA=64 [℃/W]
Tj(Operating junction Temperature)≦125[℃]
Operating Ambient Temperature =Tj-θJA×P_loss
Top Layer (1)
Middle Layer (2,3)
Bottom Layer (4)
Board : Dimensions 50mm×60mm(4 layer)
Copper thickness : 35μm
Material : Glass Epoxy (FR-4)
Thickness :1.6mm
θJA=64 [℃/W]
15/28
XC9280 Series
■TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output current
XC9280
(V IN =12V, V OUT=3.3V)
XC9280
(V IN =12V, V OUT=5.0V)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
100
90
90
Efficiency :EFFI[%]
Efficiency :EFFI[%]
CL =22μ F *2parallel(C3216X5R1E226M)
100
80
70
60
50
40
30
VIN=12V(Continuous IOUT)
20
VIN=12V(Instantaneous IOUT)
70
60
50
40
30
VIN=12V(Continuous IOUT)
20
VIN=12V(Instantaneous IOUT)
10
10
0
0.001
80
0.01
0.1
1
0
0.001
10
0.01
0.1
1
10
Output Current :IOUT[A]
Output Current :IOUT[A]
(2) Output Voltage vs. Output Current
XC9280
(V IN =12V, V OUT=1.8V)
XC9280
(V IN =12V, V OUT=5.0V)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
5.2
Output Voltage : V OUT[V]
100
Efficiency :EFFI[%]
90
80
70
60
50
40
30
VIN=12V(Continuous IOUT)
20
VIN=12V(Instantaneous IOUT)
5.1
5.0
4.9
4.8
VIN=12V(Continuous IOUT)
4.7
VIN=12V(Instantaneous IOUT)
10
0
0.001
0.01
0.1
1
4.6
0.001
10
10
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
3.4
2.0
Output Voltage : V OUT[V]
Output Voltage : V OUT[V]
1
L=2.2μ H(CLF7045T2R2N)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
3.3
3.2
3.1
VIN=12V(Continuous IOUT)
3.0
VIN=12V(Instantaneous IOUT)
2.9
0.01
0.1
Output Current :IOUT[A]
16/28
0.1
XC9280
(V IN =12V, V OUT=1.8V)
XC9280
(V IN=12V, V OUT =3.3V)
2.8
0.001
0.01
Output Current :IOUT[A]
Output Current :IOUT[A]
1
10
1.9
1.8
1.7
VIN=12V(Continuous IOUT)
1.6
VIN=12V(Instantaneous IOUT)
1.5
1.4
0.001
0.01
0.1
Output Current :IOUT[A]
1
10
XC9280
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(3) Ripple Voltage vs. Output Current
XC9280
(V IN =12V, V OUT=3.3V)
XC9280
(V IN =12V, V OUT=5.0V)
100
100
90
Ripple Voltage :V r [mV]
Ripple Voltage :V r [mV]
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
10
10
0
0.001
0.01
0.1
1
0
0.001
10
0.01
Output Current :IOUT [A]
XC9280
(V IN =12V, V OUT=1.8V)
1
10
(4) FB Voltage vs. Ambient Temperature
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
XC9280
VIN =12V
0.760
100
90
80
FB Voltage :V FB[V]
Ripple Voltage :V r [mV]
0.1
Output Current :IOUT [A]
70
60
50
40
30
0.755
0.750
0.745
20
10
0.740
0
0.001
0.01
0.1
1
-50
10
-25
Output Current :IOUT [A]
(5) UVLO Voltage vs. Ambient Temperature
0
25
50
75
100
Ambient Temperature :Ta[℃]
(6) Oscillation Frequency vs. Ambient Temperature
XC9280
XC9280
VIN =12V
1.5
Oscillation Frequency:f OSC [MHz]
UVLO Voltage :V UVLO1,V UVLO2[V]
3.5
3.4
3.3
3.2
VUVLO1(DetectVoltage)
VUVLO2(ReleaseVoltage)
3.1
125
3.0
1.4
1.3
1.2
1.1
1.0
0.9
-50
-25
0
25
50
75
Ambient Temperature :Ta[℃]
100
125
-50
-25
0
25
50
75
100
125
Ambient Temperature :Ta[℃]
17/28
XC9280 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(7) Stand-by Current vs. Ambient Temperature
(8) Lx SW ON Resistance vs. Ambient Temperature
XC9280
XC9280
VIN =12V
VIN =12V
0.25
Lx SW ON Resistance :RON [Ω]
Stand-by Current :ISTB[μ A]
5.0
4.0
3.0
2.0
1.0
0.20
0.15
0.10
Highside SW
0.05
Lowside SW
0.00
0.0
-50
-25
0
25
50
75
100
Ambient Temperature :Ta[℃]
-50
125
(9) Quiescent Current vs. Ambient Temperature
-25
0
25
50
75
100
Ambient Temperature :Ta[℃]
(10) Internal Soft-Start Time vs. Ambient Temperature
XC9280
XC9280
VIN =12V
150
VIN =12V
2.0
Internal Soft-StartTime :tSS1[ms]
Quiescent Current :Iq[μ A]
125
125
100
75
50
25
1.5
1.0
0.5
0.0
0
-50
-25
0
25
50
75
100
-50
125
-25
Ambient Temperature :Ta[℃]
(11) External Soft-Start Time vs. Ambient Temperature
0
25
50
75 100
Ambient Temperature :Ta[℃]
125
(12) PFM Current vs. Ambient Temperature
XC9280
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
XC9280
VIN =12V, R SS=430kΩ, CSS=0.47μ F
30
25
20
1.4
1.3
1.2
1.1
1.0
15
-50
-25
0
25
50
75
Ambient Temperature :Ta[℃]
18/28
VIN =12V
1.5
PFM Current :IPFM[A]
External lSoft-StartTime :tSS2[ms]
35
100
125
-50
-25
0
25
50
75
Ambient Temperature :Ta[℃]
100
125
XC9280
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(13) EN/SS Voltage vs. Ambient Temperature
(14) IOUT-VIN Operation Area
XC9280
(V OUT =5.0V)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
XC9280
VIN =12V
4.0
18
T a=25℃ (Continuous)
3.0
Input Voltage:V IN[V]
EN/SS Voltage :VEN/SS[V]
EN/SS"H"
EN/SS"L"
2.0
1.0
0.0
Ta=60℃ (Continuous)
17
T a=25℃ (Instantaneous)
T a=60℃ (Instantaneous)
9
Operation Area
8
7
6
-50
-25
0
25
50
75 100
Ambient Temperature :Ta[℃]
125
0.0
0.5
XC9280
(V OUT =3.3V)
13.2
13.2
T a=25℃ (Continuous)
Input Voltage:V IN[V]
Input Voltage:V IN[V]
T a=60℃ (Continuous)
Ta=25℃ (Instantaneous)
T a=60℃ (Instantaneous)
Operation Area
6
3.0
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
18
17
2.5
XC9280
(V OUT =1.8V)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
5
T a=25℃ (Continuous)
12
T a=60℃ (Continuous)
11
Ta=25℃ (Instantaneous)
10
T a=60℃ (Instantaneous)
9
Operation Area
8
7
6
5
4
4
0.0
1.0
1.5
2.0
Output Current:Iout[A]
0.5
1.0
1.5
2.0
Output Current:Iout[A]
2.5
0.0
3.0
(15) VOUT-VIN Operation Area
0.5
1.0
1.5
2.0
Output Current:Iout[A]
2.5
3.0
(16) IOUT Transient Operation Area
XC9280
VIN =12V, VOUT=1.8V,3.3V,5.0V
IOUT=0mA→ IOUTMAX,θJA=64[℃/W]
18
3.5
16
3.0
Maxmum Output
Current:IOUT MAX [A]
Input Voltage:V IN[V]
XC9280
14
Operation Area
12
10
8
2.5
2.0
1.5
1.0
0.01s
0.1s
6
0.5
4
0.0
1s
DC
1.0
2.0
3.0 4.0 5.0 6.0
Output Voltage:V out[V]
7.0
8.0
-50
-25
0
25
50
75 100
Ambient Temperature :Ta[℃]
125
19/28
XC9280 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(17-1) Load Transient Response (VOUT=5.0V)
XC9280
XC9280
(V IN=12V, V OUT =5.0V, IOUT =1.0A⇔2.0A)
(V IN=12V, V OUT =5.0V, IOUT =0.5A⇔1.5A)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
CL =22μ F *2parallel(C3216X5R1E226M)
100μ s/div
100μ s/div
V OUT : 500mV/div
V OUT : 500mV/div
IOUT =0.5A⇔1.5A( Slew rate=1.0A/μ sec )
IOUT =1.0A⇔2.0A ( Slew rate=1.0A/μ sec)
XC9280
XC9280
(V IN=12V, V OUT =5.0V, IOUT =1.5A⇔3.0A)
(V IN=12V, V OUT =5.0V, IOUT =0.1A⇔3.0A)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
100μ s/div
V OUT : 500mV/div
IOUT =1.5A⇔3.0A (Slew rate=1.0A/μ sec)
20/28
100μ s/div
V OUT : 500mV/div
IOUT =0.1A⇔3.0A( Slew rate = 3.0A / 50μ sec )
XC9280
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(17-2) Load Transient Response (VOUT=3.3V)
XC9280
XC9280
(V IN=12V, V OUT =3.3V, IOUT =1.0A⇔2.0A)
(V IN=12V, V OUT =3.3V, IOUT =0.5A⇔1.5A)
L=2.2μ H(CLF7045T2R2N)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
V OUT : 500mV/div
100μ s/div
100μ s/div
V OUT : 500mV/div
IOUT =1.0A⇔2.0A (Slew rate=1.0A/μ sec)
IOUT =0.5A⇔1.5A (Slew rate=1.0A/μ sec)
XC9280
XC9280
(V IN=12V, V OUT =3.3V, IOUT =1.5A⇔3.0A)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
V OUT : 500mV/div
IOUT =1.5A⇔3.0A (Slew rate=1.0A/μ sec)
(V IN=12V, V OUT =3.3V, IOUT =0.1A⇔3.0A)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
100μ s/div
100μ s/div
V OUT : 500mV/div
IOUT =0.1A⇔3.0A (Slew rate = 3.0A / 50μ sec)
21/28
XC9280 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(17-3) Load Transient Response (VOUT=1.8V)
XC9280
XC9280
(V IN=12V, V OUT =1.8V, IOUT =1.0A⇔2.0A)
(V IN=12V, V OUT =1.8V, IOUT =0.5A⇔1.5A)
L=2.2μ H(CLF7045T2R2N)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
100μ s/div
V OUT : 500mV/div
100μ s/div
V OUT : 500mV/div
IOUT =1.0A⇔2.0A (Slew rate=1.0A/μ sec)
IOUT =0.5A ⇔ 1.5A (Slew rate=1.0A/μ sec)
XC9280
XC9280
(V IN=12V, V OUT =1.8V, IOUT =1.5A⇔3.0A)
(V IN=12V, V OUT =1.8V, IOUT =0.1A⇔3.0A)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
CL =22μ F *3parallel(C3216X5R1E226M)
100μ s/div
V OUT : 500mV/div
100μ s/div
V OUT : 500mV/div
IOUT =1.5A ⇔ 3.0A (Slew rate=1.0A/μ sec)
IOUT =0.1A ⇔ 3.0A (Slew rate = 3.0A / 50μ sec)
22/28
XC9280
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(18) Input Transient Response
XC9280
XC9280
(V IN=11.5V⇔13.5V, V OUT=5.0V, IOUT=1.0A)
(V IN=11.5V⇔13.5V, V OUT=3.3V, IOUT=1.0A)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
L=2.2μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
100μ s/div
100μ s/div
VIN=11.2V⇔13.2V( Slew rate = 2.0V / μ sec )
V IN=11.2V⇔13.2V(Slew rate = 2.0V / μ sec)
V OUT : 100mV/div
V OUT : 100mV/div
XC9280
(V IN=11.5V⇔13.5V, V OUT=1.8V, IOUT=1.0A)
L=2.2μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
100μ s/div
VIN=11.2V⇔13.2V (Slew rate = 2.0V / μ sec)
V OUT : 100mV/div
23/28
XC9280 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(19) EN/SS Rising Response
XC9280
XC9280
(V IN=12V, V CE =0→12V, V OUT =5.0V, IOUT =1.0A)
(V IN=12V, V CE =0→12V, V OUT =3.3V, IOUT =1.0A)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
L=3.3μ H(CLF7045T3R3N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
200μ s/div
EN/SS=0V→12V(Slew rate = 12V / μ sec)
EN/SS=0V→12V(Slew rate = 12V / μ sec)
V OUT : 2.0V/div
V OUT : 2.0V/div
XC9280
(V IN=12V, V CE =0→12V, V OUT =1.8V, IOUT =1.0A)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
200μ s/div
EN/SS=0V→12V(Slew rate = 12V / μ sec)
V OUT : 2.0V/div
24/28
200μ s/div
XC9280
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(20) Output Voltage vs. Output Current
XC9280
XC9280
(V IN=12V, V OUT =5.0V)
(V IN=12V, V OUT =3.3V)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ fF *2parallel(C3216X5R1E226M)
L=3.3μ H(CLF7045T3R3N)
6.0
3.5
5.0
3.0
Output Voltage : V OUT[V]
Output Voltage : V OUT[V]
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
4.0
-50℃
3.0
25℃
60℃
2.0
1.0
2.5
-50℃
2.0
25℃
1.5
60℃
1.0
0.5
0.0
0.0
0.0
1.0
2.0 3.0 4.0 5.0
Output Current :IOUT[A]
6.0
7.0
0.0
1.0
XC9280
4.0
5.0
6.0
7.0
XC9280
(V OUT =5.0V)
L=3.3μ H(CLF7045T3R3N)
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
CL =22μ F *3parallel(C3216X5R1E226M)
6.0
2.0
5.0
1.6
1.2
Output Voltage : V OUT[V]
Output Voltage : V OUT[V]
3.0
Output Current :IOUT[A]
(V IN=12V, V OUT =1.8V)
-50℃
25℃
0.8
60℃
0.4
0.0
4.0
7.0V
3.0
12V
18V
2.0
1.0
0.0
0.0
1.0
2.0 3.0 4.0 5.0
Output Current :IOUT[A]
6.0
7.0
0.0
1.0
2.0 3.0 4.0 5.0
Output Current :IOUT[A]
XC9280
XC9280
(V OUT =3.3V)
(V OUT =1.8V)
L=2.2μ H(CLF7045T2R2N)
2.0
3.5
Output Voltage : V OUT[V]
3.0
2.5
7.0V
2.0
12V
1.5
18V
1.0
0.5
6.0
7.0
L=2.2μ H(CLF7045T2R2N)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *3parallel(C3216X5R1E226M)
CIN=10μ F *2parallel(C2012X5R1E106K)
CL =22μ F *2parallel(C3216X5R1E226M)
Output Voltage : V OUT[V]
2.0
1.6
6.2V
1.2
12V
0.8
0.4
0.0
0.0
0.0
1.0
2.0 3.0 4.0 5.0
Output Current :IOUT[A]
6.0
7.0
0.0
1.0
2.0 3.0 4.0 5.0 6.0
Output Current :IOUT[A]
7.0
25/28
XC9280 Series
■PACKAGING INFORMATION
For the latest package information go to, www.torexsemi.com/technical-support/packages
PACKAGE
OUTLIN / LAND PATTERN
THERMAL CHARACTERISTICS
TSOT-26
TSOT-26 PKG
TSOT-26 Power Dissipation
26/28
XC9280
Series
■MARKING RULE
TSOT-26
5
6
4
① ② ③ ④ ⑤
1
2
3
①,②,③ Type、Oscillation Frequency
Mark
①
②
③
1
1
A
Type
Oscillation
Frequency
Product Series
A
1.2MHz
XC9280A75CYR-G
④,⑤ represents production lot number
01～09, 0A～0Z, 11～9Z, A1～A9, AA～AZ, B1～ZZ repeated
(G，I，J，O，Q，W excluded)* No character inversion used.
27/28
XC9280 Series
1.
The product and product specifications contained herein are subject to change without notice to
improve performance characteristics. Consult us, or our representatives before use, to confirm that
the information in this datasheet is up to date.
2.
The information in this datasheet is intended to illustrate the operation and characteristics of our
products. We neither make warranties or representations with respect to the accuracy or
completeness of the information contained in this datasheet nor grant any license to any intellectual
property rights of ours or any third party concerning with the information in this datasheet.
3.
Applicable export control laws and regulations should be complied and the procedures required by
such laws and regulations should also be followed, when the product or any information contained in
this datasheet is exported.
4.
The product is neither intended nor warranted for use in equipment of systems which require
extremely high levels of quality and/or reliability and/or a malfunction or failure which may cause loss
of human life, bodily injury, serious property damage including but not limited to devices or equipment
used in 1) nuclear facilities, 2) aerospace industry, 3) medical facilities, 4) automobile industry and
other transportation industry and 5) safety devices and safety equipment to control combustions and
explosions. Do not use the product for the above use unless agreed by us in writing in advance.
5.
Although we make continuous efforts to improve the quality and reliability of our products;
nevertheless Semiconductors are likely to fail with a certain probability. So in order to prevent
personal injury and/or property damage resulting from such failure, customers are required to
incorporate adequate safety measures in their designs, such as system fail safes, redundancy and
fire prevention features.
6.
Our products are not designed to be Radiation-resistant.
7.
Please use the product listed in this datasheet within the specified ranges.
8.
We assume no responsibility for damage or loss due to abnormal use.
9.
All rights reserved. No part of this datasheet may be copied or reproduced unless agreed by Torex
Semiconductor Ltd in writing in advance.
TOREX SEMICONDUCTOR LTD.
28/28
工商网监
湘ICP备2023018690号
