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| Power & Power ICs |
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Microchip Technology Advances Power Management with 500 mA Synchronous Buck DC/DC Converter
| The manufacturer says... | Chipcenter's Nasser Kutkut, Ph.D., says... |
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Microchip Technology announced a 500 mA DC/DC synchronous step-down converter that operates over a multitude of input and output conditions. This gives designers an efficient method of transforming battery or bus voltage to meet their 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
This DC/DC converter also has integrated safety features such as overcurrent, overtemperature, and undervoltage lockout (UVLO) protection to safeguard the converter circuitry. Additionally, the device has an externally controllable shutdown mechanism to minimize the drain current during system inactivity. Moreover, the MCP1601 can be implemented with a complete ceramic capacitor solution, eliminating the need for larger tantalum caps. "The MCP1601 provides a very efficient and cost-effective method of converting battery or bus voltages to a desired lower voltage," said Jim Mack, marketing manager for Microchip's Analog and Interface Products Division. "In addition, it offers several self-protection mechanisms that provide an additional level of security for our customers." The input voltage on this device 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 percent duty cycle or LDO mode when the input voltage approaches the output voltage. The UVLO voltage ranges between 2.4 and 2.7 V. The MCP1601 is available in an 8-pin MSOP, with pricing set at $1.70 for 1000-piece units. Samples and volume-production quantities are available today. For additional information or pricing on these devices, contact any Microchip sales representative or authorized worldwide distributor, or visit www.microchip.com. |
Efficient power management across a wide input range may involve a multitude of conversion modes. For the case of buck regulators, PWM operation is the preferred mode for medium- to high-load conditions. At light-load or no-load conditions, pulse-frequency modulation (PFM) is the preferred mode of operation. Finally, when the input voltage approaches the output voltage, an LDO regulator is the most efficient. Can these be combined into a single controller for operation across a wide input range? Sure they can. Microchip's new 500 mA, DC/DC synchronous step-down converter incorporates these three modes of operation to realize highly efficient power-conversion solutions. The MCP1601 incorporates other safety features such as overcurrent, overtemperature, and undervoltage lockout (UVLO) protection, making it ideal for a number of handheld and battery-powered applications. |
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