XC9303 Series
!
Synchronous Step-up & down DC / DC Controller
!
Input Voltage Range
2.0V ~ 10.0V
!
Output Voltage Externally Set-up
!
Oscillation Frequency
300 kHz (Accuracy
±15%)
!
Maximum Duty Cycle
78%
(TYP.)
!
PWM, PWM/PFM Swiching Control
!
Syncronous Rectification Control
!
High Efficiency
84%
(TYP.)
!
Small MSOP-8 packaging
High Efficiency, Synchronous
Step-Up & Down DC / DC Controller ICs
July 3, 2003 Ver. 1
"
APPLICATIONS
#
PDAs
#
Palmtop computers
#
Portable Audio
#
Various power supplies
"
GENERAL DESCRIPTION
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.
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.
"
FEATURES
Input Voltage Range
Output Voltage Range
: 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%
Oscillation Frequency
Output Current
: More than 800mA
(VIN = 4.2V, VOUT=3.3V)
Stand-By Function
Package
Soft-start time
: 3.0µA (MAX.)
: MSOP-8
: 10 ms (internally set)
"
TYPICAL APPLICATION CIRCUIT
<XC9303B093K, VOUT:3.3V)
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TYPICAL PERFORMANCE CHARACTERISTICS
$
Efficiency vs. Output Current
XC9303B093K(300kHz, V
OUT
=3.3V)
Tr1:Pch MOSFET
:CPH6315
Tr2:Nch MOSFET
:CPH3409
CIN :47uF
Tr3:Nch MOSFET
:CPH3409
CFB
: 62pF
L:22uH
CDRH127/LD
SD:CMS02
V OUT : 3. 3V
100
90
80
70
60
50
40
30
20
10
0
L=22uH(CDRH127/LD), CL=94uF(Tantalum),SD:CMS02
Tr1:CPH6315, Tr2:CPH3409, Tr3:CPH3409
EXT 1
V DD
PWM
CE
V IN :2.0V~10V
P WM
CE
EXT 2
GND
FB
NC
RFB
:200 kΩ
CL:
47uF X 2
Efficiency EFFI (%)
RFB
:75 kΩ
VIN=2.7V
PWM Control
4.2V
0.1
1
10
100
1000
10000
Output Current I
OUT
(mA)
1
Semiconductor Ltd.
TOREX [ TOREX SEMICONDUCTOR ]
