Summary of XD9260/61 – 1.5A HI-SAT COT SYNCHRONOUS STEP-DOWN DC/DC CONVERTER
The XD9260/61 series are 1.5A synchronous step-down DC/DC converters using Torex's Hi-SAT COT control for fast transient response and stable oscillation frequency. They accept 2.7–5.5V input, provide 0.8–3.6V outputs (±2% accuracy), offer selectable switching at 1.2MHz or 3.0MHz, and operate from −40°C to 105°C. XD9260 uses fixed PWM; XD9261 switches between PWM and PFM to improve light-load efficiency. Other features include 0.3ms soft-start, UVLO at 2.0V, low 15µA quiescent current (1.2MHz), and AEC-Q100 qualification.
Parts used in the XD9260/61 DC/DC Converter Project:
- XD9260 synchronous step-down DC/DC converter IC
- XD9261 synchronous step-down DC/DC converter IC
- Input supply voltage (2.7 V to 5.5 V)
- Output decoupling capacitors for 0.8 V to 3.6 V outputs
- Inductor suitable for 1.5 A output current
- Output filter components (capacitors and resistors for setting output voltage)
- Soft-start circuitry (internal 0.3 ms soft-start)
- PCB with thermal and layout considerations for AEC-Q100 compliance
- UVLO threshold implementation (internal UVLO at 2.0 V)
- Configuration components for selecting switching frequency (1.2 MHz or 3.0 MHz)
XD9260/61 – 1.5A Hi-SAT COT Synchronous Step-Down DC/DC Converter, AEC-Q100 compliant
The XD9260/XD9261 series is a small 1.5A synchronous step-down DC/DC converter with high-speed transient response and low quiescent current. The extremely fast load transient performance is a result of Torex’s innovative Hi-SAT COT (Constant On-Time) control method, which, when compared to standard Constant On-Time (COT) control, provides less fluctuation in oscillation frequency against load and input voltage.
The input voltage range is 2.7V to 5.5V and the output voltage range is 0.8V to 3.6V (accuracy ±2.0%). 1.2MHz or 3.0MHz can be selected for the oscillation frequency and the operating ambient temperature range is -40°C ~ 105°C.
The XD9260 operates with Hi-SAT COT plus fixed PWM mode with fixed switching frequency whereas the XC9261 automatically changes between PWM and PFM (pulse-skipping) mode to maximise efficiency at lighter loads.
The soft-start time is set to 0.3ms (TYP.). With the built-in UVLO function, the driver transistor is forced OFF when the input voltage becomes 2.0V or lower.
Key Features
- Input Voltage from 2.7 V to 5.5 V
- Output Voltage from 0.8 V to 3.6 V in 0.05 V increments
- Up to 1.5 A Output Current
- Low Quiescent Current, only 15 µA (1.2 MHz)
- AEC-Q100 qualified (-40 ˚C ~ +105 ˚C)
Read more: XD9260/61 – 1.5A HI-SAT COT SYNCHRONOUS STEP-DOWN DC/DC CONVERTER
- What input voltage range do the XD9260/61 support?
The XD9260/61 support an input voltage range from 2.7 V to 5.5 V. - What output voltage range is available?
The output voltage range is 0.8 V to 3.6 V in 0.05 V increments with ±2.0% accuracy. - What maximum output current can the devices provide?
They provide up to 1.5 A output current. - What switching frequencies can be selected?
Selectable switching frequencies are 1.2 MHz or 3.0 MHz. - How do XD9260 and XD9261 differ in operating mode?
XD9260 uses Hi-SAT COT plus fixed PWM mode; XD9261 automatically switches between PWM and PFM to maximise light-load efficiency. - What is the soft-start time?
The soft-start time is set to 0.3 ms (typical). - What is the UVLO threshold?
The built-in UVLO forces the driver transistor off when input voltage becomes 2.0 V or lower. - What is the quiescent current?
The quiescent current is only 15 µA at 1.2 MHz. - Are the XD9260/61 qualified for automotive temperature ranges?
Yes, they are AEC-Q100 qualified with operating ambient temperature range −40°C to 105°C.
