XC9104 Datasheet, PDF (1/19 Pages) Torex Semiconductor – Step-Up DC/DC Converters

XC9103/04/05 Series
Ceramic Cap. Compatible Step-Up DC/DC Converters
June 25, 2003 Ver. 6
! Ceramic Capacitors Compatible
! Input Voltage Range: 0.9V~10.0V
! Output Voltage Externally Set-up
! Oscillation Frequency: 300kHz, 180kHz (±15%)
! PWM Control (XC9103)
PWM/PFM Automatic Switching Control (XC9104)
PWM/PFM Manual Switching Control (XC9105)
! SOT-25 / USP-6B Package
" APPLICATIONS
# PDAs
# Cellular Phones
# Palmtop Computers
# Portable Audio Systems
# Various Multi-function Power Supplies
" GENERAL DESCRIPTION
The XC9103/9104/9105 series are PWM, PWM/PFM auto switching
/manual switching controlled multi-functional step-up DC/DC converter
controllers.
Output will be stable no matter which load capacitors are used but should a
low ESR capacitor be used, RSENSE of about 0.1Ω will be required and
phase compensation will be achieved. This makes the use of ceramic
capacitors much easier and allows for lower output ripple and reduced PCB
area requirements. Tantalum and electrolytic capacitors can also be used,
in which case, RSENSE becomes unnecessary.
With 0.9V of standard voltage supply internal, and using externally
connected components, output voltage can be set up freely within a range
of 1.5V to 30V. With 300kHz or 180kHz frequencies, the size of the
external components can be reduced. Oscillation frequencies of 100kHz
and 500kHz are also available as custom-designed products.
The XC9103 series are PWM controlled. Control switches from PWM
to PFM during light loads with the XC9104 and the series is highly
efficient from light loads to large output currents. By using external signals,
control of the XC9105 can be alternated between PWM and
PWM/PFM automatic switching and so, control suited to the
application can be selected.
A current limiter circuit is built in to the IC (except with the 100kHz and
500kHz version) and monitors the ripple voltage on the FB pin. Operation
is shut down when the ripple voltage is more than 250mV(180kHz version).
The operations of the IC can be returned to normal with a toggle of the CE
pin or by turning the power supply back on.
" TYPICAL APPLICATION CIRCUIT
RSENSE:100m Ω
for Ceramic CL
SD: MA737
VOUT=3.3V
CFB: 47pF
RFB1:
RFB2:
120k Ω _{45k Ω}
IOUT=400mA
1
5
2
Ceramic CL
10µF for 200mA
3
4
10µFx2 for
CE
400mA
(CE/PWM)
L: 10µH
VIN
0.9V~
Nch Power
MOS FET
XP161A1355
" FEATURES
Input Voltage Range:
0.9V ~ 10V
Power Supply Voltage Range: 1.8V ~ 10V
Output Voltage Range:
1.5V ~ 30V
Set up freely with a standard
voltage supply of 0.9V (±2.0%) &
external components
Oscillation Frequency:
Output Current:
Controls:
High Efficiency:
Stand-by Current:
Load Capacitors:
Current Limiter Function:
Packages :
300, 180kHz ±15%
100, 500kHz available as semi-custom
more than 400mA
(VIN=1.8V, VOUT=3.3V)
PWM (XC9103)
PWM/PFM auto-switching (XC9104)
PWM/PFM manual switching (XC9105)
85% (TYP.)
ISTB=1.0µA (MAX.)
Low ESR capacitors compatible
Operates when ripple voltage
=250mV (180kHz version)
Also available without current limiter
(100kHz and 500kHz types are
available only without current limiter)
SOT-25 / USP-6B
" TYPICAL PERFORMANCE CHARACTERISTICS
XC9105D093MR
VOUT=3.3V, CL=20uF
When PWM/PFM Automatic Switching
Tr: XP161A1355PR
100
2.7V
1.8V
80
60
1.2V
40
VIN=0.9V
1.5V
20
0
0.1
1
10
100
Output Current IOUT (mA)
1000
Semiconductor Ltd.
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