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
:
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
(V
IN
= 4.2V, V
OUT
=3.3V)
:
3.0μA (MAX.)
:
78% (TYP.)
Oscillation Frequency
Output Current
Stand-By Function
Maximum Duty Cycle
Synchronous Step-Up & Down DC / DC Controller
PWM, PWM/PFM Switching Control
Synchronous Rectification Control
High Efficiency
Soft-Start Time
Package
:
84% (TYP.)
:
10ms (internally set)
:
MSOP-8A
■TYPICAL
APPLICATION CIRCUIT
<XC9303B093K OUTPUT= 3.3V>
Tr1:Pch MOSFET
:CPH6315
Tr2:Nch M OSFET
:CPH3409
Tr3:Nch M OSFET
:CPH3409
CFB
: 62pF
L:22uH
CDRH127/LD
SD:CMS02
V OUT : 3 . 3 V
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●Efficiency
vs. Output Current
XC9303B093K(300kHz, V
OUT
=3.3V)
100
90
80
Efficiency EFFI (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
10000
Output Current I
OUT
(mA)
PW M Control
VIN=2.7V
4.2V
L=22uH(CDRH127/LD), CL=94uF(Tantalum),SD:CMS02
Tr1:CPH6315, Tr2:CPH3409, Tr3:CPH3409
PW M/PFM Switching Control
CIN :47uF
EXT 1
V DD
PWM
CE
V IN :2.0V~10V
PWM
CE
EXT 2
GND
FB
NC
RFB
:200 kΩ
CL :
47uF X 2
RFB
:75 kΩ
1/20
TOREX [ TOREX SEMICONDUCTOR ]
