Brief Description
The KTB851 is a high efficiency step down converter, using constant frequency PWM current mode control. It uses 1.6MHz high switching frequency which allows the use of small external components. The 2.7V to 5.5V input operating range is ideal for Li-Ion/Polymer powered devices and systems running from regulated 3.3V or 5V voltage rails. 100% duty cycle operation provides the greatest design flexibility for achieving the lowest dropout.

FEATUREs
• Vin Range: 2.7V to 5.5V
• Maximum Output Current 600mA
• High Efficiency Up to 98%
• Low Quiescent Current
• High Switching Frequency: 1.6MHz
• Low Dropout in 100% Duty Cycle
• Shutdown Current < 1µA
• No Schottky Diode Required
• Output Auto Discharge when Disabled (Option)
• Integrated Soft-Start : 170µs
• Adjustable Output Voltage Down to 0.6V
• Short Circuit Protection
• Over-Temperature Protection
• Pb-Free Packages:
   ► KTB851 : UTDFN-6, 1.6x1.6x0.55mm
   ► KTB851 : TDFN-6, 1.6x1.6x0.75mm
   ► KTB851A/B : TSOT23-5
• RoHS and Green Compliant
• -40°C to +85°C Temperature Range

APPLICATIONs
• Mobile Phones
• Portable Instruments
• Digital Still Cameras
• Microprocessor Power
• MP3 Players