XD9243 Series

2A Synchronous Step-Down DC/DC Converters

*AEC-Q100 (Grade3) compliant

The XD9243 series is a group of synchronous-rectification step-down DC/DC converters with a built-in 0.11Ω(TYP.) P-channel MOS driver transistor and 0.12Ω(TYP.) N-channel MOS switching transistor, designed to allow the use of ceramic capacitors.

The small on-resistances of these two internal driver transistors enable a high efficiency, stable power supply with an output current up to 2A. The XD9243 series has operating voltage range of 2.7V~6.0V and a 0.8V (±2.0%) reference voltage, and using externally connected resistors, the output voltage can be set freely from 0.9V. With an internal switching frequency of 1.2MHz or 2.4MHz, small external components can be used.

The series have a high speed soft-start as fast as 1ms in typical for quick turn-on. It’s suitable for large-current application due to limit current is configured 4.0A in typical. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. The integrated CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and VSS pins. Due to CL discharge function, malfunction on LX is prevented when Stand-by mode.

*TOREX’s automotive products (XD Series) are AEC-Q100 compliant.

Typical Application Circuit


Input Voltage Range 2.7V~6.0V
Output Voltage Range 0.9V~VIN
FB Voltage 0.8V±2.0%
High Efficiency 95%(TYP.)
Output Current 2.0A
Oscillation Frequency 1.2MHz±15%,2.4MHz±15%
Maximum Duty Cycle 100%
Functions Soft-Start
Current Limit(Automatic return)
Thermal Shut Down
Output Capacitor Low ESR Ceramic Capacitor
Control Methods PWM/PFM
Operating Ambient Temperature - 40℃ ~ + 85℃
Environmentally Friendly EU RoHS Compliant, Pb Free


Package USP-10B Number of Pins 10
Pcs/Reel 3,000 Package Size(mm) 2.6 x 2.9 x 0.6


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