XC9103/04/05 Series
!
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
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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.
Ceramic Cap. Compatible
Step-Up DC/DC Converters
June 25, 2003 Ver. 6
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APPLICATIONS
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PDAs
#
Cellular Phones
#
Palmtop Computers
#
Portable Audio Systems
#
Various Multi-function Power Supplies
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FEATURES
Input Voltage Range:
Power Supply Voltage Range:
Output Voltage Range:
0.9V ~ 10V
1.8V ~ 10V
1.5V ~ 30V
Set up freely with a standard
voltage supply of 0.9V (±2.0%) &
external components
300, 180kHz ±15%
100, 500kHz available as semi-custom
Oscillation Frequency:
Output Current:
Controls:
more than 400mA
(VIN=1.8V, VOUT=3.3V)
PWM (XC9103)
PWM/PFM auto-switching (XC9104)
PWM/PFM manual switching (XC9105)
High Efficiency:
Stand-by Current:
Load Capacitors:
Current Limiter Function:
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)
Packages :
SOT-25 / USP-6B
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TYPICAL APPLICATION CIRCUIT
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TYPICAL PERFORMANCE CHARACTERISTICS
XC9105D093MR
VOUT=3.3V, CL=20uF
When PWM/PFM Automatic Switching
Tr: XP161A1355PR
RSENSE:100m
Ω
for Ceramic CL
SD: MA737
RFB1:
120k
Ω
CFB: 47pF
RFB2:
45k
Ω
1
2
Ceramic CL
10
µ
F for 200mA
10
µ
Fx2 for
400mA
3
CE
(CE/PWM)
4
5
100
L: 10
µ
H
80
Efficiency EFFI (%)
1.8V
2.7V
VIN
0.9V~
VOUT=3.3V
IOUT=400mA
60
1.2V
40
VIN=0.9V
1.5V
Nch Power
MOS FET
XP161A1355
20
0
0.1
1
10
100
Output Current IOUT (mA)
1000
Semiconductor Ltd.
1
TOREX [ TOREX SEMICONDUCTOR ]
