The KB3511 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.8V and 3.3V. Supply current during operation is only 25μA and drops to 1μA in shutdown. The 2.5V to 6.5V input voltage range makes the KB3511 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.
Automatic Trickle Mode operation increases efficiency at light loads, further extending battery life. Switching frequency is internally set at 2.2MHz, allowing the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The KB3511 is available in a low profile (0.8mm) DFN33-10 package.

*Up to 97% Efficiency
*25uA No Load Current Per Channel
*800mA Output Current
*2.5V to 6.5V Input Voltage Range
*2.2MHz Constant Frequency Operation
*No Schottky Diode Required
*Low Dropout Operation: 100% Duty Cycle
*0.6V Reference Allows Low Output Voltages
*Shutdown Mode Draws 1μA Supply Current
*Current Mode Operation for Excellent Line and Load Transient Response
*Overtemperature Protected
*DFN33-10 Package

*Cellular Telephones
*Personal Information Appliances
*Wireless and DSL Modems
*Digital Still Cameras
*MP3 Players
*Portable Instruments

KB3511A, KB3511B

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