XC9303B093KR-G Datasheet, PDF (1/20 Pages) Torex Semiconductor – High Efficiency, Synchronous Step-Up & Down DC / DC Controller ICs

XC9303 Series
High Efficiency, Synchronous Step-Up & Down DC / DC Controller ICs
ETR0602_004
☆Green Operation 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 10ms 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 : 2.0V ~ 10V
Output Voltage Range
Oscillation Frequency
: 2.0V ~ 6.0V
(set freely with V_FB=0.9V)
: 300kHz (±15%)
Output Current
: 800mA(VIN = 4.2V, VOUT=3.3V)
Stand-By Function
: 3.0μA (MAX.)
Maximum Duty Cycle : 78% (TYP.)
High Efficiency
: 84% (TYP.)
Soft-Start Time
: 10ms (internally fixed)
Package
: MSOP-8A
Environmentally Friendly: EU RoHS Compliant, Pb Free
■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:CM S02
V OUT :3. 3V
Tr3:Nch MOSFET
: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
VIN=2.7V
4.2V
30
20
PW M Control
10
0
0.1
1
10
100 1000 10000
Output Current IOUT (mA)
1/20