COT Control, 1.5A Synchronous Step-Down DC/DC Converters
The XC9262 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 1.5A to be configured using only a coil and two capacitors connected externally. Oscillation frequency is set to 1.2MHz or 3MHz 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 0.30ms 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 2.0V 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.
|May 22, 2015||
|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||2.7V～5.5V|
|Output Voltage Range||0.8V～3.6V(±2.0%)|
|Capacitor||Low ESR Ceramic|
|Operating Ambient Temperature||-40℃～+105℃|
|Environmentally Friendly||EU RoHS Compliant, Pb Free|
|Package||LGA-8B01||Number of Pins||8|
|Pcs/Reel||5,000||Package Size(mm)||1.2 x 1.4 x 0.3|
How 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.
What is the soft-start function?
The function to soften the rise to prevent the inrush current.
How does the CL discharge function work?
The function rapidly releases the charge remained in the CL capacitor to make the VOUT pin voltage zero. The VOUT pin voltage does not reach zero immediately after being turned off by the CE function due to the charge remained in the connected CL capacitor. While the charge in the CL capacitor is gradually reaching zero, the LSI continues operating and does not work with the CE pin signal, which may cause a malfunction. This is why the discharge is required when turning off the CE pin. A larger capacitance of the capacitor needs longer time to be discharged.
What does CL mean?
Load capacitor. Other companies often refer to it as COUT.