XC9303 Datasheet, PDF (1/18 Pages) Torex Semiconductor – Step-Up & Down DC / DC Controller ICs

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
Oscillation Frequency
Output Current
Stand-By Function
Package
Soft-start time
: 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%
: More than 800mA
(VIN = 4.2V, VOUT=3.3V)
: 3.0µA (MAX.)
: MSOP-8
: 10 ms (internally set)
" TYPICAL APPLICATION CIRCUIT
<XC9303B093K, VOUT:3.3V)
" TYPICAL PERFORMANCE CHARACTERISTICS
$ Efficiency vs. Output Current
Tr1:Pch MOSFET
:CPH6315
Tr2:Nch MOSFET
:CPH3409
CIN :47uF
PWM
CE
V IN :2.0V~10V
EXT1
V DD
PWM
CE
EXT2
GND
FB
NC
L:22uH
CDRH127/LD
SD:CMS02
V OUT : 3. 3V
Tr3:Nch MOSFET
:CPH3409
CFB
:62pF
RFB
:200 kΩ
CL:
47uF X2
RFB
:75 kΩ
1
XC9303B093K(300kHz, V_OUT=3.3V)
L=22uH(CDRH127/LD), CL=94uF(Tantalum),SD:CMS02
100
Tr1:CPH6315, Tr2:CPH3409, Tr3:CPH3409
90
80
70
60
50
40
VIN=2.7V
4.2V
30
20
PWM Control
10
0
0.1
1
10
100 1000 10000
Output Current IOUT (mA)
Semiconductor Ltd.