XC9259 Series

1A COT Control, 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 (±2.0%) increments of 0.05V. The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. Oscillation frequency is set to 1.2MHz or 6MHz can be

selected for suiting to your particular application. As for operation mode HiSAT-COT(*) control excellent in transient response, the XC9259 has PWM control and automatic PWM/PFM switching control, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load).

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 0.30ms 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 1.6V or lower. The B types integrate CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge.

Package is available in LGA-8B01 (1.2mm x 1.4mm x h0.3mm).

(*) HiSAT-COT is an original Torex term for High Speed Transient Response.

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May 22, 2015
Product News
Ultra-small, Low Profile, Low ON Resistance Package! Step-down DC/DC Converters with HiSAT-COT Fast Transient Response Control XC9259 Series (1.0A) / XC9262 Series (1.5A)

Typical Application Circuit


Input Voltage Range 2.5V~5.5V
Output Voltage Range 0.8V~3.6V(±2.0%)
Oscillation Frequency 1.2MHz,6.0MHz
Protection Circuits Thermal Shut Down
Current Limit
Short Circuit Protection(TypeB)
Functions Soft-Start
CL Discharge(TypeB)
Capacitor Low ESR Ceramic
Environmentally Friendly EU RoHS compliant, Pb free




QuestionHow does the GO function of DC/DC converters work? Does it work just like a regulator?

Torex regard the PWM/PFM automatic switch control function as Green Operation (GO) in the case of DC/DC. The GO function is defined as the switching operation between the PFM mode for a small output current and the PWM mode for a large output current. The PFM control method controls the output current by increasing and decreasing the fall time according to the output current while keeping a pulse width. The PWM control method controls the output current by adjusting the pulse width of the rise time, which keeps the rise/fall time interval constant and increases the efficiency at a heavy load. By switching between the PFM control for a small output current and the PWM control for a large output current, the quiescent current can be controlled for both of heavy and light loads.

QuestionWhat is the soft-start function?

The function to soften the rise to prevent the inrush current.

QuestionWhat is the standby current?

The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.