July 3, 2003 Ver. 1
!
Synchronous Step-up & down DC / DC Controller
"
APPLICATIONS
!
Input Voltage Range
2.0V ~ 10.0V
!
Output Voltage Externally Set-up
#
PDAs
!
Oscillation Frequency
300 kHz (Accuracy
15%)
!
Maximum Duty Cycle
78% (TYP.)
#
Palmtop computers
!
PWM, PWM/PFM Swiching Control
!
Syncronous Rectification Control
#
Portable Audio
!
High Efficiency
84% (TYP.)
!
Small MSOP-8 packaging
#
Various power supplies
"
GENERAL DESCRIPTION
"
FEATURES
Input Voltage Range
: 2.0V ~ 10V
Output Voltage Range
: 2.0V ~ 6.0V
Oscillation Frequency
: 300kHz
15%
Output Current
: More than 800mA
(VIN = 4.2V, VOUT=3.3V)
Stand-By Function
: 3.0
A (MAX.)
Package
: MSOP-8
Soft-start time
: 10 ms (internally set)
"
TYPICAL APPLICATION CIRCUIT
"
TYPICAL PERFORMANCE CHARACTERISTICS
<XC9303B093K, VOUT:3.3V)
$
Efficiency vs. Output Current
1
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.
The XC9303 series is highly efficient, synchronous PWM, PWM/PFM
switching 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 synchronous PWM and synchronous PWM/PFM (auto-
switching) externally using 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.
XC9303 Series
Can be set freely with 0.9V
(
2.0%) of reference voltage supply
and external components.
High Efficiency, Synchronous
Step-Up & Down DC / DC Controller ICs
XC9303B093K(300kHz, V
OUT
=3.3V)
0
10
20
30
40
50
60
70
80
90
100
0.1
1
10
100
1000
10000
Output Current I
OUT
(mA)
Effi
ci
e
n
cy EF
F
I
(
%
)
L=22uH(CDRH127/LD), CL=94uF(Tantalum),SD:CMS02
Tr1:CPH6315, Tr2:CPH3409, Tr3:CPH3409
VIN=2.7V
4.2V
PWM Control
SD:CMS02
VDD
EXT 1
PWM
CE
GND
EXT 2
FB
PWM
CE
L:22uH
CDRH127/LD
Tr1:Pch MOSFET
:CPH6315
RFB
:75 k
Tr2:Nch MOSFET
:CPH3409
CIN :47uF
VIN :2.0V~10V
CL:
47uF X2
RFB
:200 k
CFB
: 62pF
VOUT : 3. 3V
Tr3:Nch MOSFET
:CPH3409
NC
Semiconductor Ltd.
"
PIN CONFIGURATION
"
PIN ASSIGNMENT
"
ORDERING INFORMATION
XC9303
123456
DESCRIPTION
FB Voltage
0.9V
"
PACKAGE INFORMATION
$
MSOP-8A
2
Ground
External Transistor Drive Pin <Connected to Low side of Nch Power MOSFET Gate>
Switching Frequency 300kHz
Reverse Feed
No Connection
Output Voltage Monitor Feedback Pin <Threshold value : 0.9V. Output voltage can be set freely by connecting
split resistors between VOUT and Ground.>
Package
MSOP-8A
PWM/PFM Switching Pin <PWM control when connected to VDD, PWM / PFM auto switching when connected
to Ground. >
Chip Enable Pin <Connected to Ground when output is stand-by mode. Connected to VDD when output is
active. EXT/1 is high and EXT2/ is low when in stand-by mode.>
External Transistor Drive Pin <Connected to High Side of Pch Power MOSFET Gate>
FUNCTIONS
2
VDD
Supply Voltage
PIN NUMBER
PIN NAME
1
EXT 1 /
4
CE
3
PWM
5
NC
6
FB
DESIGNATOR SYMBOL
7
GND
8
EXT2
1
B
Standard
2
0
3
9
4
3
XC9303 Series
High Efficiency, Synchronous
Step-Up & Down DC / DC Controller ICs
6
R
Embossed Tape
Standard Feed
L
5
K
1 EXT1
2 VDD
3 PWM
FB 6
GND 7
EXT2 8
4 CE
NC 5
MSOP-8A
(TOP VIEW)
-
3.00 + 0.10
0.30
(0.65)
3.
0
0
+
0.
10
4.
9
0
+
0.
10
+0.08
-0.02
0.
00 ~
0.
20
0 ~ 6
O
0.
86
1.
02
+0.
1
1
-0
.
1
0
+0.20 -0
.
2
1
0.
5
3
+
0.
13
0.15
+0.08
-0.02
Semiconductor Ltd.
"
BLOCK DIAGRAM
"
ABSOLUTE MAXIMUM RATINGS
Ta=25
O
C
3
Operating Ambient Temperature
Topr
- 40 ~ + 85
O
C
Tstg
- 55 ~ +125
VDD
- 0.3 ~ 12
V
VDD Pin Voltage
EXT1, 2 Pin Voltage
EXT1, 2 Pin Current
SYMBOL
RATINGS
UNITS
PARAMETER
- 0.3 ~ 12
V
FB Pin Voltage
VEN
- 0.3 ~ 12
V
CE Pin Voltage
VFB
VPWM
- 0.3 ~ 12
V
PWM Pin Voltage
VEXT
- 0.3 ~ 12
V
MODE Pin Voltage
IEXT
100
mA
Pd
150
mW
Power Dissipation
VEXT
- 0.3 ~ VDD + 0.3
V
O
C
Storage Temperature
XC9303 Series
High Efficiency, Synchronous
Step-Up & Down DC / DC Controller ICs
+
-
FB
EXT1/
GND
EXT2
Ramp Wave
Generator,
OSC
Error Amp
PWM
Comparator
C E
PWM
CE to
internal circuit
Synchronous
blank logic
VIN
+
-
PWM/PFM
Controller
Vref=0.9V
withSoft Start,
CE
Semiconductor Ltd.
"
ELECTRICAL CHARACTERISTICS
XC9303B093
(FOSC = 300kHz)
Ta=25
O
C
VOUT
Unless otherwise stated, VDD = 3.0V, CE = 3.0V, PWM = 3.0V, FB = 3.0V, EXT1, 2=OPEN, VIN=2.7V
Notes 1)
2)
3)
Tr1 : CPH6315
(SANYO)
Tr2 : CPH3409
(SANYO)
Tr3 : CPH3409
(SANYO)
SD : CMS02
(TOSHIBA)
L : 22
H
(SUMIDA CDRH127/LD)
CL : 16V, 47
F x 2
(NICHICEMI Tantalum MCE Series)
CIN : 16V, 47
F
(NICHICEMI Tantalum MCE Series)
RFB1 : 200k
RFB2 : 75k
CFB : 62pF
4
1
Supply Voltage
CONDITIONS
UNITS
TEST
CIRCUIT
MAX.
TYP.
MODE = 0V
10.0
1
MODE = 0V
Maximum Input Voltage
VDD
VIN
V
V
2.0
-
10.0
-
-
Supply Current 1
V
1
-
6.0
2.0
Output Voltage Range(note 1)
A
2
FB = 0V
IDD1
170
-
90
FB = 1.0V
-
IDD2
Supply Current 2
A
2
55
110
Same as IDD1, CE = 0V
-
ISTB
Stand-by Current
A
2
-
3.0
Same as IDD1
255
FOSC
Oscillation Frequency
kHz
2
300
345
FB = 0V
0.65
VCEH
CE "High" Voltage
V
2
-
-
FB = 0V
-
VCEL
CE "Low" Voltage
-
V
2
-
0.2
-
0.5
IPWMH
-
- 0.5
- 0.5
CE = 0V
-
ICEL
-
0.5
-
Efficiency1 (note 2 )
%
PFMDTY
PFM Duty Ratio
FB = 0V, EXT1 = 0.4V
-
10.0
20.0
4
30
38
No Load, VPWM=0V
22
4
TSS
%
EFFI
mS
84
-
IOUT1=300mA (note 3)
-
4
5
26
37
VOUT
0.95V, CE=0V
0.65V
5.0
REXTBL1
REXTBH1
-
0.20
V
CE = 0V, EXT2 = VDD - 0.4V
-
23
CE1 = 0, EXT1= VDD - 0.4V
0.65
PWM "Low" Voltage
No Load
-
PWM=0V
-
IPWML
A
2
MIN.
XC9303 Series
High Efficiency, Synchronous
Step-Up & Down DC / DC Controller ICs
SYMBOL
PARAMETER
- 0.50
0.50
A
A
2
5
4
A
2
A
2
A
2
EXT2 "Low" ON Resistance
PWM "High" Voltage
No Load
PWM "High" Current
VOUTSET
EXT2 "High" ON Resistance
EXT1 "Low" ON Resistance
EXT1 "High" ON Resistance
Soft-Start Time
REXTBH2
REXTBL2
VPWMH
VPWML
CE "Low" Current
ICEH
CE "High" Current
PWM "Low" Current
VIN
2.0V, IOUT=1mA
-
V
EXT2 = VDD - 0.4V
-
19
30
-
2
31
-
19
30
5
-
4
-
5
-
-
Please be careful not to exceed the breakdown voltage level of the peripheral parts.
EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
FB "Low" Current
IFBH
FB "High" Current
IFBL
FB = 1.0V
-
FB Voltage
VFB
VIN=3.0V, IOUT=10mA
0.882
0.900
0.918
V
3
Minimum Operation Voltage
VINmin
-
-
2.0
V
1
%
2
Maximum Duty Ratio
MAXDTY
Same as IDD1
72
Same as IDD2
-
78
88
-
0
%
2
Minimum Duty Ratio
MINDTY
Semiconductor Ltd.
"
OPERATIONAL DESCRIPTION
<Error Amp>
<OSC Generator>
<Ramp Wave Generator>
<PWM Comparator>
<PWM/PFM Controller>
<Synchronous, blank logic>
<Vref with Soft Start>
<Chip Enable Function>
5
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.
This circuit generates the oscillation frequency which in turn generates the source clock.
The XC9303 series are synchronous step-up & down DC/DC converter controller ICs with built-in high speed, low ON resistance drivers.
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.
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the Phase Shift Generator.
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).
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please refer to page 8). 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.
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 highlevel (the external P-type MOSFET will be OFF) and the EXT2 pin will be kept at a lowlevel (the
external N-type MOSFET will be OFF). When CE pin is in a state of chip disable, current consumption will be no more than 3.0
A.
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.
The synchronous, blank logic circuit is to prevent penetration of the transistor connected to EXT1 and EXT2.
XC9303 Series
High Efficiency, Synchronous
Step-Up & Down DC / DC Controller ICs
Semiconductor Ltd.
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