XC9206/XC9207/XC9208Series
ETR0503_001
PWM, PWM / PFM Switchable Step-Down
DC / DC Converters With Driver Transistor Built-In
☆GO-Compatible
■GENERAL DESCRIPTION
The XC9206/XC9207/XC9208 series is a group of DC/DC converters with a built-in 0.4Ω P-channel driver transistor, offered
in a SOT-25 package. The ICs are designed to provide high efficiencies and a stable power supply with an output current of
500mA using only a coil, a diode and two ceramic capacitors connected externally.
Minimum operating voltage of the XC9206/9207 is 1.8V and 2.0V for XC9208. Output voltage is internally programmable in
a range from 0.9V to 4.0V in 100mV increments (accuracy: ±2.0%). Oscillation frequency is selectable from 300kHz, 600kHz
and 1.2MHz so that the frequency best suited to your particular application can be selected. Each series features different
operation modes: PWM control (XC9206 series), automatic PWM/PFM switching control (XC9207 series) and manual
PWM/PFM switching control (XC9208 series). The series gives fast transient response, low ripple and high efficiency over
the full range of load (from light load to high output current conditions). The soft start and current control functions are
internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less.
With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input
voltage becomes 1.4V or lower.
■FEATURES
P-ch driver Tr. Built-in
Output Voltage Range
■APPLICATIONS
●Mobile phones
: ON resistance 0.4Ω
: 0.9V ~ 4.0V
(PDC, GSM, CDMA, IMT2000 etc.)
●PDAs, Portable communication modems
●Portable games
(100mV increments)
Fixed output voltage accuracy ±2%
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
Fixed oscillation frequency
Accuracy ±15%
●Cameras, digital cameras
●Cordless phones
Stand-by function
: Istb = 1μA (MAX.)
: 600mA
●Note book computers
Current Limiter built-in
Input Voltage Range
: 1.8V ~ 6.0V(XC9206/XC9207)
2.0V ~ 6.0V (XC9208)
: 500mA
Output Current
Maximum Duty Ratio
: 100%
PWM/PFM Switching Control (XC9207 / XC9208)
Ceramic Capacitor Compatible
Soft start circuit built-in
Small Package
: SOT-25
■TYPICAL APPLICATION CIRCUIT
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
CIN:4.7μF,CL:10μF, L:4.7μH(CDRH3D16),
SD:CRS02, Topr=25℃
CE/MODE
VOUT
CE/
3
4
5
MODE
100
PWM/PFM
Switching Control
VSS
Lx
90
2
1
VOUT
(500mA)
80
70
L
VIN
VIN=2.4V
VIN
3.6V
60
CL
(ceramic)
50
4.2V
CIN
(ceramic)
SD
40
PWM Control
30
20
10
0
L
:4.7μF (CDRH 3D16,SUMIDA)
0.1
1
10
100
1000
SD :CRS02 (SCHOTTKY DIODE,TOSHIBA)
CL :10μF (ceramic)
Output Current IOUT (mA)
CIN :4.7μF (ceramic)
1/15
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