Device converts battery or bus voltages to system requirements
7 May 2003Power Electronics / Power Management
Infrastructure
Microchip Technology offers a 500 mA, DC-to-DC synchronous step-down converter that operates over a multitude of input and output conditions giving designers an efficient method of transforming battery or bus voltage to its system requirements. Used in applications such as cellular phones, PDAs, digital cameras and USB-powered devices, the MCP1601 operates in three modes and automatically switches among them to follow a maximum efficiency curve for the given input/output (I/O) condition.
The three operating modes include: pulse width modulation (PWM), for normal medium-to-high load conditions; pulse frequency modulation (PFM), for light or no-load conditions over an extended time; and low-drop-out mode (LDO), for cases when the input approaches the output voltage.
The input voltage ranges from 2,7 to 5,5 V. The output voltage range is from 0,9 V to as high as VIN for the input voltage, while the shutdown current is typically less than 0,1 µA. It has a load current capability of up to 500 mA continuous and will operate at 100% duty cycle or LDO mode when the input voltage approaches the output voltage. The UVLO voltage ranges between 2,4 and 2,7 V.
This DC-to-DC converter in 8-pin MSOP package, also has integrated safety features, such as over-current, over-temperature and under-voltage lockout protection. Additionally, it has an externally-controllable shutdown mechanism to minimise drain current during system inactivity. It can be used as a complete ceramic capacitor solution eliminating the need for larger tantalum caps.
For more information contact Avnet Kopp, 011 809 6100, Memec SA, 021 674 4103, Tempe Technologies, 011 452 0530.
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