XC9253R Datasheet, PDF (1/13 Pages) Torex Semiconductor – Synchronous Step-Down DC/DC Converter

XC9253R Series
Synchronous Step-Down DC/DC Converter
ETR0528_003
ˑGreenOperation Compatible
˙GENERAL DESCRIPTION
The XC9253R series is a group of synchronous-rectification type DC/DC converters with a built-in 0.6ЊP-channel driver
transistor and 0.7ЊN-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 to be configured using only a coil and two capacitors
connected externally. Minimum operating voltage is 2.0V~6.0V. Output voltage is 3.3V(accuracy: ʶ2.0%). With the built-in
oscillator, oscillation frequency is set to 600kHz. As for operation mode, the XC9253R series is automatic PWM/PFM
switching control 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 1.0ЖA 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 and
USP-6B, are available.
˙APPLICATIONS
˔Smart phones / Mobile phones
˔Bluetooth
˔Mobile devices / terminals
˔Portable game consoles
˔Digital still cameras / Camcorders
˔Note PCs / Tablet PCs
˙FEATURES
P-Ch Driver Tr. Built-In
N-Ch DriverTr. built-in
Input Voltage Range
Output Voltage Range
Low Power Consumption
Control Method
High Efficiency
: ON resistance 0.6Њ
: ON resistance 0.7Њ
: 2.0V~6.0V
: 3.3V
: 15ЖA (TYP.) (VIN=3.6V)
: PWM/PFM Automatic
: 92% (TYP.)
(VIN=4.5V, VOUT=3.3V, IOUT=100mA)
Output Current
: 500mA
Oscillation Frequency
: 600kHz (ʶ15%)
Low Output Ripple
: 10mV
Maximum Duty Ratio
: 100%
Operating Ambient Temperature _{: -40ˆ ʙ +85ˆ}
Packages
: SOT-25, USP-6B
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
* Performance depends on external components and wiring on the PCB
˙TYPICAL APPLICATION CIRCUIT
L
V IN
1 VIN
Lx 5
C IN
(ceramic)
CE
2 VSS
CE
3
VOUT 4
V OUT
500mA
CL
(ceramic)
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