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ADP2370ACPZ-5.0-R7 Datasheet(PDF) 1 Page - Analog Devices |
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ADP2370ACPZ-5.0-R7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page High Voltage, 1.2 MHz/600 kHz, 800 mA, Low Quiescent Current Buck Regulator Data Sheet ADP2370/ADP2371 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. FEATURES Input voltage range: 3.2 V to 15 V, output current: 800 mA Quiescent current < 14 µA in power saving mode (PSM) >90% efficiency Force PWM pin (SYNC), 600 kHz/1.2 MHz frequency pin (FSEL) Fixed outputs: 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, 5 V, and adjustable option 100% duty cycle capability Initial accuracy: ±1% Low shutdown current: <1.2 µA Quick output discharge (QOD) option Synchronizable to an external clock 8-lead, 0.75 mm × 3 mm × 3 mm LFCSP (QFN) package Supported by ADIsimPower design tool APPLICATIONS Portable and battery-powered equipment Automatic meter readers (WSN) Point of sales and transaction processing instruments Medical instruments Medium format display tablets and pads TYPICAL APPLICATION CIRCUIT ADP2370/ ADP2371 FSEL EN POWER GOOD VOUT = 3.3V VIN = 6V CIN 10µF COUT 10µF AGND (EXPOSED PAD) VIN SYNC ON OFF 1.2MHz 600kHz SW PG PGND FB 1 2 3 4 8 7 6 5 Figure 1. GENERAL DESCRIPTION The ADP2370/ADP2371 are high efficiency, low quiescent current, 800 mA buck (step-down) dc-to-dc converters in small 8-lead, 3 mm × 3 mm LFCSP (QFN) packages. The total solution requires only three tiny external components. The buck regulator uses a proprietary high speed current mode, constant frequency PWM control scheme for excellent stability and transient response. The need for an external rectifier is elimi- nated by using a high efficiency synchronous rectifier architecture. To ensure the longest battery life in portable applications, the ADP2370/ADP2371 employ a power saving variable frequency mode that reduces the switching frequency under light load conditions. The ADP2370/ADP2371 operate from input voltages of 3.2 V to 15 V allowing the use of multiple alkaline/NiMH, lithium cells, or other standard power sources. The ADP2370/ADP2371 offer multiple options for setting the operational frequency. The ADP2370/ADP2371 can be synchro- nized to a 600 kHz to 1.2 MHz external clock or it can be forced to operate at 600 kHz or 1.2 MHz via the FSEL pin. The ADP2370/ ADP2371 can be forced to operate in PWM mode (FPWM) when noise considerations are more important than efficiency. A power-good output is available to indicate when the output voltage is below 92% of its nominal value. The ADP2371 is identical to the ADP2370 except that the ADP2371 includes the addition of an integrated switched resistor, quick output discharge function (QOD) that auto- matically discharges the output when the device is disabled. Both devices include an internal power switch and a synchronous rectifier for minimal external part count and high efficiency. The ADP2370/ADP2371 also include internal soft start and internal compensation for ease of use. During a logic controlled shutdown, the input is disconnected from the output and the regulator draws less than 1.2 μA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and soft start to prevent input overcurrent at startup. Short-circuit protection and thermal over- load protection circuits prevent damage under adverse conditions. The ADP2370/ADP2371 each use one 0805 capacitor, one 1206 capacitor, and one 4 mm × 4 mm inductor. The total solution size is about 53 mm2 resulting in a very small footprint solution to meet a variety of portable applications. |
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