0.8V Synchronous Step-up DC/DC Converter
The XC9128/29 series is a synchronous step-up DC/DC with a 0.2Ω (typ) N-channel driver transistor and a synchronous 0.2Ω (typ) P-channel switching transistor built-in and is capable of providing step-up solutions from inputs as low as 0.8V.
With a high switching frequency of 1.2MHz, a small inductor can be used making the XC9128/29 ideally suited to applications with limited board space. Output voltage is externally set within a range of 1.8V~5.3V using a reference voltage supply of 0.45V and split resistors.
The XC9128 series incorporates an AEN/ (Adaptor Enable) pin which allows the XC9128 to also be used to provide a fast power supply back-up solution when the IC is used together with added power sources such as AC adaptors. The AEN/ pin monitors the external power source and can quickly sense if that power supply fails, providing immediate back-up.
The MODE pin enables the user to select either fixed PWM control or PWM/PFM automatic switching control by sending a high or low signal to the pin.
The series can be used with ceramic capacitors.
Features
- Operating Voltage: 0.8V ~ 5.3V
- Output Voltage: 1.8V~ 5.3V (externally set)
- Output Current: 500mA (Vout=3.3V, Vin=1.8V)
- Switching Frequency: 1.2MHz
- Soft-Start Time: 5ms (typ)
- Thermal Shutdown & Integral Latch Protection
- Adaptor Enable Function (AEN/ pin)
- Packages : USP-10B, MSOP-10 (XC9128) & SOP-8 (XC9129)