TPS64201

www.ti.com SOT23 STEPĆDOWN CONTROLLER TPS64200, TPS64201 TPS64202, TPS64203 SLVS485 − AUGUST 2003 FEATURES D Step-Down Controller for Applications With up to 95% Efficiency D 1.8-V to 6.5-V Operating Input Voltage Range D Adjustable Output Voltage Range From 1.2 V to VI D High Efficiency Over a Wide Load Current Range D 100% Maximum Duty Cycle for Lowest Dropout D Internal Softstart D 20-µA Quiescent Current (Typical) D Overcurrent Protected D Available in a SOT23 Package APPLICATIONS D USB Powered Peripherals D Organizers, PDAs, and Handheld PCs D Low Power DSP Supply D Digital Cameras D Hard Disk Drives D Portable Audio Players DESCRIPTION The TPS6420x are nonsynchronous step-down controllers that are ideally suited for systems powered from a 5-V or 3.3-V bus or for applications powered from a 1-cell Li-Ion battery or from a 2- to 4-cell NiCd, NiMH, or alkaline battery. These step-down controllers drive an external P-channel MOSFET allowing design flexibility. To achieve highest efficiency over a wide load current range, this controller uses a minimum on time, minimum off time control scheme and consumes only 20-µA quiescent current. The minimum on time of typically 600 ns (TPS64203) allows the use of small inductors and capacitors. When disabled, the current consumption is reduced to less than 1 µA. The TPS6420x is available in the 6-pin SOT23 (DBV) package and operates over a free air temperature range of −40°C to 85°C. TYPICAL APPLICATION CIRCUIT 5V 10 µF TPS64200...