XC9206 Datasheet, PDF (1/15 Pages) Torex Semiconductor – PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In

XC9206 / 9207/ 9208 Series
PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In
September 17, 2003 Ver. 2
! P-Channel Driver Transistor Built-In
! Input Voltage Range
: 1.8V ~ 6.0V (XC9206/XC9207)
: 2.0V ~ 6.0V (XC9208)
! Output Voltage Range
: 0.9V ~ 4.0V
! Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
! Output Current
! Maximum Duty Ratio
: 500mA
: 100%
! Small Package
: SOT-25
! PWM/PFM Switching Control (XC9207 / XC9208)
! Ceramic Capacitor Compatible
" APPLICATIONS
# Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
# PDA, Portable communication modem
# Portable game
# Camera, Digital camera, Camcorder
# Cordless phone
# Note book computer
" GENERAL DESCRIPTION
The XC9206/9207/9208 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 increments of 100mV (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
ON resistance 0.4Ω
Output Voltage Range
0.9V ~ 4.0V (100mV steps)
Fixed output voltage accuracy ±2%
Oscillation Frequency
300kHz, 600kHz, 1.2MHz
Fixed oscillation frequency
accuracy ±15%
Stand-by function
Istb = 1µA (MAX.)
Current Limiter Circuit built-in 600mA
Small Package
SOT-25
Soft start circuit built-in
" TYPICAL APPLICATION CIRCUIT
CE/MODE
4
CE/ ^VOUT
MODE
3
VSS ₂
VIN
5 VIN
Lx 1
CIN
(ceramic)
L
SD
" TYPICAL PERFORMANCE CHARACTERISTICS
VOUT
(500mA)
CL
(ceramic)
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
CIN:4.7µF,CL:10µF, L:4.7µH(CDRH3D16),
100
90
80
PWM/PFM
Switching Control
SD:CRS02, Topr=25^OC
70
VIN=2.4V
60
3.6V
50
4.2V
40
PWM
30
Control
20
10
0
0.1
1
10
100
1000
Output Current IOUT (mA)
Data Sheet
1
Semiconductor Ltd.