ADP2102

600毫安的3MHz同步降压型DC- DC转换器 600mA 3MHz Synchronous Step-Down DC-DC Converter

Product Details

The is a synchronous step-down dc-to-dc converter that converts a 2.7 V to 5.5 V unregulated input voltage to a lower regulated output voltage with up to 95% efficiency and 1% accuracy. The low duty cycle capability of the ADP2102 is ideal for USB applications or 5 V systems that power up submicron subvolt processor cores. Its 3 MHz typical operating frequency and excel-lent transient response allow the use of small, low cost 1 μH inductors and 2.2 μF ceramic capacitors. At medium-to-high load currents, it uses a current mode, pseudofixed frequency pulse-width modulation to extend battery life. To ensure the longest battery life in portable applications, the ADP2102 has a power save mode PSM that reduces the switching frequency under light load conditions to significantly reduce quiescent current.

The ADP2102 is available in both fixed and adjustable output voltage options with 600 mA maximum output current. The preset output voltage options voltage are 1.875 V, 1.8 V, 1.5 V, 1.375 V, 1.25 V, 1.2 V, 1.0 V, and 0.8 V. The adjustable voltage option is available from 0.8 V to 3.3 V. The ADP2102 requires only three external components and consumes 0.01 μA in shutdown mode.

The ADP2102 is available in an 8-lead LFCSP package and is specified for the −40 °C to +85 °C temperature range.

**Applications**

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USB powered devices

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WLAN and gateways

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Point of loads

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Processor core power from 5 V

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Digital cameras

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PDAs and palmtop computers

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Portable media players, GPS

### Features and Benefits

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Input voltage range: 2.7 V to 5.5 V

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600 mA maximum load current

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95% efficiency

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Low duty cycle operation

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Only 3 tiny external ceramic components

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3 MHz typical operating frequency

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Fixed output voltage of 1.2 V or 1.375 V

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Adjustable output voltage up to 3.3 V

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0.01 µA shutdown supply current

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Automatic power save mode

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Internal synchronous rectifier

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Internal soft start

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Internal compensation

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Enable/shutdown logic input

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Undervoltage lockout

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Current limit protection

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Thermal shutdown

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Small 8-lead, 3 mm × 3 mm LFCSP