PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
XC9106 / 07 Series
Preliminary
Externally Applied Reference Voltage (Vref)
June 26, 2003 Ver. 2
! Externally Applied Reference Voltage (Vref)
! Ceramic Capacitors Compatible
" APPLICATIONS
# Power Supply for LCD
# PDAs
! Input Voltage Range: 0.9V~10.0V
! Oscillation Frequency: 300kHz, 100kHz (±15%)
! PWM Control (XC9106)
# Cellular Phones
# Palmtop Computers
# Portable Audio Systems
# Various Multi-function Power Supplies
PWM/PFM Automatic Switching Control (XC9107)
! SOT-25 / USP-6B Packages
" GENERAL DESCRIPTION
" FEATURES
The XC9106 / 07 series are step-up DC/DC controller ICs
with an externally applied reference voltage (Vref).
Output voltage will be set with external resistors (RFB1 and 2)
and Vref value. The series make it easy to control output
voltage externally and are suited to software applications that
need to vary voltage, such as LCD power supply for PDA.
Output will be stable no matter which load capacitors are
used but if a low ESR capacitor is 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.
Input Voltage Range:
0.9V ~ 10.0V
Power Supply Voltage Range: 1.8V ~ 10.0V and more than Vref+0.7V
VREF Input Range:
Output Voltage:
0.8V ~ 2.5V (±2.0%)
Vref x external split resistor ratio
VOUT=Vref x (RFB1+RFB2)/RFB2
300kHz, 100kHz ±15%
Oscillation Frequency:
Output Current:
more than 30mA
(VIN=3.3V, VOUT=20V, when peripheral
components are used as in the circuits below .)
Controls:
PWM (XC9106)
Oscillation frequencies of high clock, low ripple 300kHz and
low supply current 100kHz are available.
PWM/PFM auto-switching (XC9107)
85% (TYP.)
High Efficiency:
The XC9107 series are PWM/PFM automatic switching
controlled. Control switches from PWM to PFM during light
loads with the XC9107 and the series is highly efficient from
light loads to large output currents. By bringing the whole
circuit down while the series is in the stand-by mode
(CE/PWM pin : low), supply current can be reduced to less
than 1.0µA.
Stand-by Current:
ISTB=1.0µA (MAX.)
Load Capacitors:
Packages:
Low ESR capacitors compatible
SOT-25, USP-6B
" TYPICAL APPLICATION CIRCUIT
" TYPICAL APPLICATION PERFORMANCE
XC9107D003MR
Circuit as left
VDD=VIN=3.3V, IOUT=30mA
30
RSENSE : 100m Ω
25
20
15
10
5
for Ceramic CL
SD : MA737
L : 10µH
*
CFB : 27pF
RFB1 : RFB2 :
270k Ω 30k Ω
VOUT = 8V~25V
IOUT = 30mA
0
VIN = 3.3V
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Vref (V)
CIN
Nch Power
MOS FET
2SK2159
1
2
5
4
Ceramic CL :
10µF
XC9107D003MR
30
Circuit as left
VDD=VIN=3.3V
3
CE/Vref
25
20
15
10
5
0.8V~2.5V
2.5V
D/A converter
2.0V
1.5V
* RSENSE is of no use in light load (uncontinuous mode) applications such
as a small LCD, even using ceramic capacitor.
Vref=0.8V
0
0.1
1
10
100
1000
IOUT (mA)
Semiconductor Ltd.
1
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