Products - Step-Down

XD9243 2A Synchronous Step Down DC/DC Converter

2A Synchronous Step Down DC/DC Converter image


Property XD9243
Output Current 2A
Input Voltage 2.7 ~ 6.0V
Output Voltage 0.9 ~ 6.0V
Oscillation Frequency 1.2MHz, 2.4MHz
Quiescent Current 41µA
Packages USP-10B

Product Description

2A Synchronous Step Down DC/DC Converter

The XD9243 series is a synchronous PFM/PWM auto switching step-down DC/DC converter with an integral 0.11Ω (TYP.) P-channel and a synchronous 0.12Ω (TYP.) N-channel switching transistor built-in. Output currents of up to 2A can be achieved using a simple circuit.

The XD9243 operates with input voltages ranging between 2.7V and 6.0V, and its output voltage can be set between 0.9V and VIN by using two external resistors.

With switching frequencies of 1.2MHz or 2.4MHz, small inductors can be used, making the series ideally suited to applications where height and PCB area is limited.

The XD9243 series features various protection circuits, such as a thermal shutdown circuit that stops operation when the chip’s temperature reaches 150ºC and a UVLO (Under Voltage Lock Out) circuit that does the same when the input voltage decreases below 2.5V. Both of the above functions are implemented using hysteresis, and will allow the XD9243 to resume normal operation when the chip’s temperature drops below 130ºC and when the input voltage increases to 2.68V respectively.

Available in a USP-10B package


•Input Voltage: 2.7V ~ 6.0V
•Output Voltage: 0.9V ~ VIN
•Output Current: 2A
•Switching Frequency : 1.2MHz or 2.4MHz
•Soft-Start Circuit Built-In
•CL Discharge
•Current Limit Circuit (automatic return)
•Thermal Shutdown

XC9243 Circuit with Adjustable Output Voltage

XD9243 Circuit with Dynamic Output Voltage