XC9135 series.

Synch Step-Up DC/DC Converter with Load Disconnect

The XC9135 is a synchronous boost DC/DC converter with a 0.2 Ohm N-channel driver transistor and a 0.2 Ohm synchronous P-channel switching transistor built-in. The series also incorporates a number of features including load disconnect, CL discharge and soft-start as well as protection circuits which include thermal shutdown and over-current limit.

The load disconnect function disables the connection between the input and output during shutdown. Therefore, as the load is completely isolated from the battery during shutdown, battery drain is minimized.

It should be noted that although the input voltage range is listed as going down as low as 0.65V, the IC cannot actually start-up from this level. The 0.65V value is the Operation Hold Voltage (VHLD) once the IC has started-up. The actual minimum input voltage level required in order for the IC to start-up (Operation Start Voltage or VST1) is 0.9V when an output voltage of 3.3V is needed (using a 33 Ohm load resistor).
 

The series can be used with low ESR ceramic capacitors.

Key Features

• Output Current: 500mA (VOUT=3.3V, VIN=1.8V)
• Input Voltage Range: 0.65V ~ 5.5V
• Output Voltage: 1.8V ~ 5.0V
• Switching Frequency: 1.2MHz (+/-15%)
• Input Current: 1.0A
• Load Disconnect Function
• Thermal Shutdown Circuit
• Control Mode Selection: PWM or Auto PWM/PFM
• Low ESR Capacitor - Ceramic capacitor compatible

 

Package: USP-10B