描述The TPS62000 device is a low-noise synchronous step-down dc-dc converter that is ideally suited for systems powered from a 1-cell Li-ion battery or from a 2- to 3-cell NiCd, NiMH, or alkaline battery. The TPS62000 operates typically down to an input voltage of 1.8 V, with a specified minimum input voltage of 2 V. The TPS62000 is a synchronous current-mode PWM converter with integrated N- and P-channel power MOSFET switches. Synchronous rectification is used to increase efficiency and to reduce external component count. To achieve the highest efficiency over a wide load current range, the converter enters a power-saving pulse-frequency modulation (PFM) mode at light load currents. Operating frequency is typically 750 kHz, allowing the use of small inductor and capacitor values. The device can be synchronized to an external clock signal in the range of 500 kHz to 1 MHz. For low-noise operation, the converter can be operated in the PWM mode and the internal antiringing switch reduces noise and EMI. In the shutdown mode, the current consumption is reduced to less than 1 µA. The TPS62000-HT is available in the 10-pin (HKK). The device operates a free-air temperature range of –55°C to 210°C.特性High-Efficiency Synchronous Step-Down ConverterWith Greater Than 95% Efficiency 2 V to 5.5 V Operating Input Voltage Range Adjustable Output Voltage Range From0.8 V to VI Synchronizable to External Clock Signal up to 1 MHz Up to 300 mA Output Current Pin-Programmable Current Limit High Efficiency Over a Wide Load Current Range inPower Save Mode 100% Maximum Duty Cycle for Lowest Dropout Low-Noise Operation Antiringing Switch andPFM/PWM Operation Mode Internal Softstart 50-µA Quiescent Current (TYP) Evaluation Module Available for CommercialTemperature Range APPLICATIONS Down-Hole Drilling High Temperature Environments SUPPORTS EXTREME TEMPERATURE APPLICATIONS Controlled Baseline One Assembly/Test Site One Fabrication Site Available in Extreme (–55°C/210°C) Temperature Range(1) Extended Product Life Cycle Extended Product-Change Notification Product Traceability Texas Instruments high temperature products utilizehighly optimized silicon (die) solutions with designand process enhancements to maximize performance overextended temperatures.(1) Custom temperature ranges available.