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PDF XC9303 Data sheet ( Hoja de datos )
| Número de pieza | XC9303 | |
| Descripción | Synchronous Step-Up & Down DC / DC Controller ICs | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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XC9303 Series
High Efficiency, Synchronous Step-Up & Down DC / DC Controller ICs
ETR0602_001
☆GO-Compatible
■GENERAL DESCRIPTION
The XC9303 series is highly efficient, synchronous PWM, PWM/PFM switchable step-up & down DC/DC controller ICs.
A versatile, large output current and high efficiency, step-up/down DC/DC controller can be realized using only basic
external components - transistors, coil, diode, capacitors, and resistors for detecting voltages. High efficiency is obtained
through the use of a synchronous rectification topology. The operation of the XC9303 series can be switched between PWM
and PWM/PFM (auto switching) externally using the PWM pin. In PWM/PFM mode, the XC9303 automatically switches
from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of output loads conditions.
Output noise can be easily reduced with PWM control since the frequency is fixed. Synchronous rectification control can be
switched to non-synchronous by using external signals (MODE pin). High efficiency can be regulated at heavy loads when
synchronous operation. The XC9303 has a 0.9V (±2.0%) internal voltage supply and using externally connected
components, output voltage can be set freely between 2.0V to 6.0V. With an internal 300kHz switching frequency smaller
external components can be used. Soft-start time is internally set to 10msec and offers protection against in-rush currents
when the power is switched on and prevents voltage overshoot.
■APPLICATIONS
●PDAs
●Palmtop computers
●Portable audios
●Various power supplies
■FEATURES
Input Voltage Range
Output Voltage Range
Oscillation Frequency
: 2.0V ~ 10V
: 2.0V ~ 6.0V
: Can be set freely with 0.9V
(±2.0%) of reference voltage
supply and external
components.
: 300kHz (±15%)
Output Current
Stand-By Function
: More than 800mA
(VIN = 4.2V, VOUT=3.3V)
: 3.0μA (MAX.)
Synchronous Step-Up & Down DC / DC Controller
Maximum Duty Cycle : 78% (TYP.)
PWM, PWM/PFM Switching Control
Synchronous Rectification Control
High Efficiency
: 84% (TYP.)
Soft-Start Time
: 10ms (internally set)
Package
: MSOP-8A
■TYPICAL APPLICATION CIRCUIT
<XC9303B093K OUTPUT= 3.3V>
Tr1:Pch MOSFET
:C PH 6315
Tr2:Nch M OSFET
:C PH 3409
CIN :47uF
PWM
CE
V IN :2.0V~10V
EXT1
V DD
PWM
CE
EXT2
GND
FB
NC
L:22uH
C D R H 127/LD
SD :C M S02
V OUT :3 .3 V
Tr3:Nch M OSFET
:C PH 3409
CFB
:62pF
RFB
:200 kΩ
CL:
47uF X2
RFB
:75 kΩ
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current
XC9303B093K(300kHz, VOUT=3.3V)
L=22uH(CDRH127/LD), CL=94uF(Tantalum),SD:CMS02
Tr1:CPH6315, Tr2:CPH3409, Tr3:CPH3409
100
PW M/PFM Switching Control
90
80
70
60
50
40
V IN= 2. 7V
4.2V
30
20 PW M Control
10
0
0.1 1 10 100 1000 10000
Output Current IOUT (mA)
1/20
1 page  
www.DataSheet4U.com
XC9303
Series
■ OPERATIONAL EXPLANATION
The XC9303 series are synchronous step-up & down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.
<Error Amp.>
The error amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp.
decreases.
<OSC Generator>
This circuit generates the oscillation frequency, which in turn generates the source clock.
<Ramp Wave Generator>
The ramp wave generator generates a saw-tooth waveform based on outputs from the phase shift generator.
<PWM Comparator>
The PWM Comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the error
amp's output is low, the external switch will be set to ON.
<PWM/PFM Controller>
This circuit generates PFM pulses. Control can be switched between PWM control and PWM/PFM automatic switching
control using external signals. The PWM/PFM automatic switching mode is selected when the voltage of the PWM pin is less
than 0.2V, and the control switches between PWM and PFM automatically depending on the load. As the PFM circuit
generates pulses based on outputs from the PWM comparator, shifting between modes occurs smoothly. PWM control mode
is selected when the voltage of the PWM pin is more than 0.65V. Noise is easily reduced with PWM control since the switching
frequency is fixed. Control suited to the application can easily be selected which is useful in audio applications, for example,
where traditionally, efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise
problems associated with the PFM mode in stand-by).
<Synchronous, blank logic>
The synchronous, blank logic circuit is to prevent penetration of the transistor connected to EXT1 and EXT2.
<Vref with Soft Start>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please
refer to next page). To protect against inrush current, when the power is switched on, and also to protect against voltage
overshoot, soft-start time is set internally to 10ms. It should be noted, however, that this circuit does not protect the load
capacitor (CL) from inrush current. With the Vref voltage limited and depending upon the input to the error amps, the operation
maintains a balance between the two inputs of the error amps and controls the EXT pin's ON time so that it doesn't increase
more than is necessary.
<Chip Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the CE pin is 0.2V or less, the mode will be
chip disable, the channel's operations will stop. The EXT1 pin will be kept at a high level (the external P-ch MOSFET will be
OFF) and the EXT2 pin will be kept at a low level (the external N-ch MOSFET will be OFF). When CE pin is in a state of chip
disable, current consumption will be no more than 3.0μA. When the CE pin's voltage is 0.65V or more, the mode will be chip
enable and operations will recommence. With soft-start, 95% of the set output voltage will be reached within 10ms (TYP.)
from the moment of chip enable.
<Output Voltage Setting>
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on
the values of RFB11 (RFB21) and RFB12 (RFB22). The sum of RFB11 (RFB21) and RFB12 (RFB22) should normally be 1 MΩor less.
VOUT = 0.9×( RFB11 + RFB12 ) / RFB12
The value of CFB1(CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2×π×CFB1×RFB11) which is equal
to 12kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and value of load
capacity (CL).
5/20
5 Page 
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XC9303
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(4) Supply Current 1 vs. Supply Voltage
XC9303B093 (300kHz)
(5) Supply Current 2 vs. Supply Voltage
XC9303B093 (300kHz)
600 300
500
400 Topr=85o C
25o C
300 -40o C
200
250
200 Topr=85o C
25o C
150 -40o C
100
100 50
0
0 2 4 6 8 10
Supply Voltage: VDD (V)
0
024 68
Supply Voltage: VDD (V)
(6) Stand-by Current vs. Supply Voltage
XC9303B093 (300kHz)
10
(7) Soft-start Time vs. Supply Voltage
XC9303B093 (300kHz)
25
8 Topr=85o C
25o C
6 -40o C
4
2
0
02468
Supply Voltage: VDD (V)
(8) CE 'H' 'L' Voltage vs. Supply Voltage
XC9303B093 (300kHz)
0.8
10
20
15
10 Topr=85o C
25o C
-40o C
5
0
024 68
Supply Voltage: VDD (V)
(9) PWM 'H' 'L' Voltage vs. Supply Voltage
XC9303B093 (300kHz)
0.8
10
10
0.6
-40o C
0.4
Topr=25o C
85o C
0.2
0.6
-40o C
0.4
Topr=25o C
85o C
0.2
0
0 2 4 6 8 10
Supply Voltage: VDD (V)
0
0 2 4 6 8 10
Supply Voltage: VDD (V)
11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet XC9303.PDF ] | |
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