XC9106 / 07 Series
Preliminary
Externally Applied Reference Voltage (Vref)
Ceramic Capacitors Compatible
Input Voltage Range: 0.9V~10.0V
Oscillation Frequency: 300kHz, 100kHz (鹵15%)
PWM Control (XC9106)
PWM/PFM Automatic Switching Control (XC9107)
SOT-25 / USP-6B Package
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
May 23, 2002 Ver. 1-1
Applications
Power Supply for LCD
PDAs
Cellular Phones
Palmtop Computers
Portable Audio Systems
Various Multi-function Power Supplies
General Description
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, R
SENSE
of about 0.1鈩?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, R
SENSE
becomes unnecessary.
Oscillation frequencies of high clock, low ripple 300kHz and low
supply current 100kHz are available.
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 1.0碌A(chǔ).
Features
0.9V ~ 10.0V
Power Supply Voltage Range:
1.8V ~ 10.0V and more than Vref+0.7V
V
REF
Input Range:
0.8V ~ 2.5V (鹵2.0%)
Output Voltage:
Vref x external split resistor ratio
V
OUT
=Vref x (RFB1+RFB2)/RFB2
Oscillation Frequency:
300kHz, 100kHz
鹵15%
Output Current:
more than 30mA
(V
IN
=3.3V, V
OUT
=20V, when peripheral
components are used as in the circuits
below .)
Input Voltage Range:
Controls:
High Efficiency:
Stand-by Current:
Load Capacitors:
Packages:
PWM (XC9106)
PWM/PFM auto-switching (XC9107)
85% (TYP.)
ISTB=1.0碌A(chǔ) (MAX.)
Low ESR capacitors compatible
SOT-25, USP-6B
Typical Application Circuit
Electrical Characteristics
XC9107D003MR
30
L : 10碌H
V
OUT
(V)
25
20
15
10
5
0
CIN
V
IN
= 3.3V
0.0
0.5
1.0
Nch Power
MOS FET
2SK2159
1.5 2.0
Vref (V)
2.5
3.0
Circuit as left
V
DD
=V
IN
=3.3V, I
OUT
=30mA
RSENSE : 100m
鈩?/div>
for Ceramic CL SD : MA737
*
CFB : 27pF
V
OUT
= 8V~25V RFB1 :
I
OUT
= 30mA 270k
鈩?/div>
RFB2 :
30k
鈩?/div>
Ceramic CL :
10碌F
1
2
3
CE/Vref
5
XC9107D003MR
30
25
V
OUT
(V)
20
15
10
5
0
0.1
1
Circuit as left
V
DD
=V
IN
=3.3V
4
0.8V~2.5V
D/A converter
2.5V
2.0V
1.5V
Vref=0.8V
10
I
OUT
(mA)
100
1000
* R
SENSE
is of no use in light load (uncontinuous mode)
applications such as a small LCD, even using ceramic capacitor.
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