COT Control, 1.0A Synchronous Step-Down DC/DC Converters
The XC9259 series is a group of synchronous-rectification type DC/DC converters with a built-in P-channel MOS driver transistor
and N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Output voltage is internally set in a
range from 0.8V to 3.6V (accuracy: ±2.0%) increments of 0.05V. The device provides a high efficiency, stable power supply with
an output current of 1.0A to be configured using only a coil and two capacitors connected externally. Oscillation frequency is set to
1.2MHz or 6.0MHz can be selected for suiting to your particular application.
The operation mode is HISAT-COT (*) control, which has an excellent transient response. PWM control or PWM/PFM auto
switching control can be selected at the MODE pin, and a high-speed response, low ripple, and high efficiency are achieved
across the entire load range (from light loads to heavy loads).
During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. As for the soft-start function
as fast as 0.3ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS
driver transistor is forced OFF when input voltage becomes 2.00V or lower. The B types integrate CL High Speed discharge
function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge.
The package is the ultra-small 1.2mm × 1.4mm × h0.3mm (LGA-8B01).
(*) HiSAT-COT is an original Torex term for High Speed Transient Response.
Smart phones, Personal digital assistance
Input Voltage Range
Output Voltage Range
Portable game consoles
Digital still cameras, Camcorders
Operating Ambient Temperature
: 2.5V 5.5V
: 0.8V 3.6V ( 2.0%)
: 1.2MHz, 6.0MHz
: HiSAT-COT Control
100% Duty Cycle
: Thermal Shutdown
Current Limit (Pendent character)
Short Circuit Protection (Type B)
CL High Speed Discharge (Type B)
: Ceramic Capacitor
: - 40
: EU RoHS Compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
L =LTF5022T-4R7N2R0(4.7 H)
CIN = 10 F(GRM155R61A106M) CL = 10
Output Current: IOUT (mA)