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Torex Semiconductor - Synchronous Step-Down DC/DC Converters

Numéro de référence XC9225
Description Synchronous Step-Down DC/DC Converters
Fabricant Torex Semiconductor 
Logo Torex Semiconductor 





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XC9225 fiche technique
XC9225/XC9226/XC9227 Series
Synchronous Step-Down DC/DC Converters
ETR0507_004
GreenOperation Compatible
GENERAL DESCRIPTION
The XC9225/XC9226/XC9227 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.6
P-channel driver transistor and 0.7 N-channel switching transistor, designed to allow the use of ceramic capacitors. The
ICs enable a high efficiency, stable power supply with an output current of 500mA (A~D series) and 600mA (E~H series) to be
configured using only a coil and two capacitors connected externally. Minimum operating voltage is 2.0V~6.0V (A~D series),
4.5V~5.5V (E~H series). Output voltage is internally programmable in a range from 0.9V to 4.0V (A~D series) and 3.0~4.0V
(E~H series) in increments of 0.05V (accuracy: 2.0%). With the built-in oscillator, oscillation frequency is selectable from
600kHz and 1.2MHz to make available the frequency best suited to your particular application. As for operation mode, the
XC9225 series is PWM control, the XC9226 series is automatic PWM/PFM switching control and the XC9227 series can be
manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast
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 standby, all circuits are shutdown to reduce
current consumption to as low as 1.0 A or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal
P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower. Two types of package, SOT-25
(250mW) and USP-6B (100mW), are available.
APPLICATIONS
Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
Bluetooth equipment
PDAs, Portable communication modem
Portable games
Cameras, Digital cameras
Cordless phones
Notebook computers
FEATURES
P-Ch Driver Tr. Built-In
N-Ch DriverTr. built-in
Input Voltage Range
: ON resistance 0.6
: ON resistance 0.7
: 2.0V~6.0V (A~D series)
Output Voltage Range
4.5V~5.5V (E~H series)
: 0.9V~4.0V (A~D series)
3.0V~4.0V (E~H series)
(0.05V increments)
Low Power Consumption : 15 A (TYP.) (VIN=3.6V, VOUT=1.8V)
Control Method
: Fixed PWM (XC9225)
PWM/PFM Automatic (XC9226)
High Efficiency
PWM/PFM Manual (XC9227)
: 92% (TYP.)
Output Current
(VIN=3.0V, VOUT=1.8V, IOUT=100mA)*
: 500mA *(A~D series)
Oscillation Frequency
Low Output Ripple
Maximum Duty Ratio
Soft-Start Circuit Built-In
600mA *(E~H series)
: 600kHz, 1.2MHz ( 15%)
: 10mV
: 100%
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
Packages
: SOT-25 (SOT-23-5), USP-6B
* Performance depends on external components and wiring on the PCB
TYPICAL APPLICATION CIRCUIT
V IN
C IN
( c er amic )
CE/ MO DE
1 VIN
Lx 5
2 VSS
3
CE/
MODE
V OUT
4
L
VOUT
500mA (600mA)
CL
( c er amic )
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
XC9227A18C
L=4.7uH( NR3015) ,CIN=4.7uF( c er amic ) ,
CL=10uF( c er amic ) ,Topr =25
100
90
80
70
60
50
40 V IN=5.0V
30 V IN=3.6V
20
V IN=2.7V
10
0
0.1
1 10 100
Output Current:IOUT(mA )
1000
PWM/PFM A utomatic Sw itching Control
PWM Control
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