XC9206_1 Datasheet, PDF (1/16 Pages) Torex Semiconductor – PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In

XC9206/XC9207/XC9208 Series
ETR0503_002
PWM, PWM / PFM Switchable Step-Down
DC / DC Converters With Driver Transistor Built-In
ç
ˑGO-Compatible
ç _{˙GENERAL DESCRIPTION}
ç _{The XC9206/XC9207/XC9208 series is a group of DC/DC converters with a built-in 0.4Њ P-channel driver transistor, offered}
ç in a SOT-25 package. The ICs are designed to provide high efficiencies and a stable power supply with an output current of
ç ^{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
ç _{a range from 0.9V to 4.0V in 100mV increments (accuracy: ±2.0%). Oscillation frequency is selectable from 300kHz, 600kHz}
ç _{and 1.2MHz so that the frequency best suited to your particular application can be selected. Each series features different}
ç ^{operation modes: PWM control (XC9206 series), automatic PWM/PFM switching control (XC9207 series) and manual}
ç
PWM/PFM switching control (XC9208
the full range of load (from light load
series).
to high
The series gives fast transient response, low ripple and high efficiency over
output current conditions). The soft start and current control functions are
ç _{internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0ЖA 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.
˙APPLICATIONS
˔Mobile phones
(PDC, GSM, CDMA, IMT2000 etc.)
˔PDAs, Portable communication modems
˔Portable games
˔Cameras, digital cameras
˔Cordless phones
˔Note book computers
˙FEATURES
P-ch driver Tr. Built-in
Output Voltage Range
: ON resistance 0.4Њ
: 0.9V ~ 4.0V
(100mV increments)
Fixed output voltage accuracy ±2%
Oscillation Frequency : 300kHz, 600kHz, 1.2MHz
Fixed oscillation frequency
Accuracy ±15%
Stand-by function
Current Limiter built-in
: Istb = 1ЖA (MAX.)
: 600mA
Input Voltage Range
: 1.8V ~ 6.0V(XC9206/XC9207)
2.0V ~ 6.0V (XC9208)
Output Current
: 500mA
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 ˙çTYPICAL PERFORMANCE
CHARACTERISTICS
˔Efficiency vs. Output Current
CE/MODE
4
CE/ ^VOUT
MODE
3
VSS ₂
VIN
5 VIN
Lx 1
CIN
(ceramic)
L
SD
VOUT
(500mA)
CL
(ceramic)
L :4.7ЖF (CDRH 3D16,SUMIDA)
SD :CRS02 (SCHOTTKY DIODE,TOSHIBA)
CL :10ЖF (ceramic)
CIN :4.7ЖF (ceramic)
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
100
90
80
70
CIN:4.7Ж F,CL:10Ж F, L:4.7Ж H(CDRH3D16),
SD:CRS02, Topr=25ˆ
PWM/PFM
Switching Control
VIN=2.4V
60
3.6V
50
4.2V
40
30
PWM Control
20
10
0
0.1
1
10
100
1000
Output Current IOUT (mA)
1/16