General Description
The XC9515 series consists of 2 channel synchronous step-down DC/DC converters and a voltage detector with delay circuit built-in.
The DC/DC converter block incorporates a P-channel 0.35Ω (TYP.) driver transistor and a synchronous N-channel 0.35Ω (TYP.) switching transistor.
By minimizing ON resistance of the built-in transistors, the XC9515 series can deliver highly efficient and a stable output current up to 800mA.
With high switching frequencies of 1MHz, a choice of small inductor is possible.
The series has a built-in UVLO (under-voltage lock-out) function, therefore, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.8V or lower (for XC9515A, 2.7V or lower).
The voltage detector block can be set delay time freely by connecting an external capacitor. With the manual reset function, the series can output a reset signal at any time.
Features
DC/DC Block
- Input Voltage Range : 2.5V~5.5V
- Output Voltage : VOUT1=1.2V~4.0V / VOUT2=1.2V~4.0V(Accuracy ±2%)
- Oscillation Frequency : 1MHz(Accuracy ±15%)
- High Efficiency : 95% (VIN=5V,VOUT=3.3V)
- Output Current : 800mA
- Control : PWM control : PWM control
- Protection Circuits : Thermal Shutdown / Integral Latch (Over Current Limit)/ Short Protection Circuit
- Output Capacitor : Ceramic Capacitor Compatible
- Package : QFN-20
Voltage Detector (VD) Block
- Detect Voltage Range : 2.0~5.5V(Accuracy ±2%)
- Delay Time : 173ms (When Cd=0.1μF is connected)
- Output Configuration : N-channel open drain
Applications
- DVDs
- Blu-ray Disk
- LCD TVs, LCD modules
- Multifunctional printers
- Photo printers
- Set top boxes
Typical Application Circuit
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