TP62568DBVR

The TP62568 uses a constant frequency, current mode step-down architecture. Both the main (P-channel MOSFET) and synchronous (N-channel MOSFET) switches are internal. During normal operation, the internal top power MOSFET is turned on each cycle when the oscillator sets the RS latch, and turned off when the current comparator, ICOMP, resets the RS latch. The peak inductor current at which ICOMP resets the RS latch, is controlled by the output of error amplifier EA. When the load current increases, it causes a slight decrease in the feedback voltage, FB, relative to the 0.6V reference, which in turn, causes the EA amplifier's output voltage to increase until the average inductor current matches the new load current. While the top MOSFET is off, the bottom MOSFET is turned on until either the inductor current starts to reverse, as indicated by the current reversal comparator IRCMP, or the beginning of the next clock cycle.

Applications

• Cellular and Smart Phones
• Wireless and DSL Modems
• PDAS
• Portable Instruments
• Digital Still and Video Cameras
• PC Cards

Key features

• High Efficiency: Up to 96%
• 2.5V to 6V Input Voltage Range
• 1.5MHz Constant Frequency Operation
• No Schottky Diode Required
• Low Dropout Operation: 100% Duty Cycle
• PFM Mode for High Efficiency in Light Load
• Overtemperature Protected
• Low Quiescent Current: 40μA
• Short Circuit Protection
• Inrush Current Limit and Soft Start Available in SOT23 - 5