XC9106/XC9107Series
ETR04005-006a
PWM Control, PWM/PFM Switching Control,
Step-Up DC/DC Converters, Externally Applied Vref
☆Green Operation-Compatible
■GENERAL DESCRIPTION
The XC9106 / XC9107 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 RFB2) 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.
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 1.0μA.
■FEATURES
■APPLICATIONS
●Power supply for LCDs
Input Voltage
Power
: 0.9V ~ 10V
●E-book Readers / Electronic dictionaries
●Smart phones / Mobile phones
●Note PCs / Tablet PCs
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
●Digital audio equipments
Oscillation Frequency : 300kHz, 100kHz (±15%)
●Multi-function power supplies
Output Current
: More than 30mA
(VIN=3.3V, VOUT=20V,
when external components are
used as in the circuits below.)
: PWM (XC9106)
Controls
: PWM/PFM auto-switching
(XC9107)
High Efficiency
Stand-by Current
Load Capacitors
: 85% (TYP.)
: ISTB = 1.0μA (MAX.)
: Low ESR capacitors compatible
Externally Applied Reference Voltage (Vref)
Packages : SOT-25, USP-6B
Environmentally Friendly : EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
■TYPICAL APPLICATION CIRCUIT
CHARACTERISTICS
XC9107D003MR
Circuit as left
DD=VIN=3.3V, IOUT=30mA
RSENSE: 100m Ω
for Ceramic CL
*
V
30
25
20
15
10
5
SD : MA737
L : 10µH
CFB : 27pF
V
= 8V~25V
= 30mA
RFB1 :
270k Ω
RFB2 :
30k Ω
OUT
I
OUT
V
= 3.3V
IN
CIN
0
Nch Pow er
MOS FET
2SK2159
1
2
3
5
4
0.0
0.5
1.0
1.5
Vref (V)
2.0
2.5
3.0
Ceramic CL :
10µF
XC9107D003MR
Circuit as left
DD=VIN=3.3V
V
CE/V ref
30
25
20
15
10
5
0.8V~2.5V
D/A converter
2.5V
2.0V
* RSENSE is of no use in light load (uncontinuous mode)
applications such as a small LCD, even using ceramic
capacitor.
1.5V
Vref=0.8V
100 1000
0
0.1
1
10
OUT (mA)
I
1/13
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