Analog Devices, Inc - High Voltage,Low Quiescent Current Buck Reg - 18 June 2012

The ADP2370/ADP2371 are high efficiency, low quiescent current, 800 mA buck (step-down) dc-to-dc converters in small 8-lead, 3 mm x 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 eliminated 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.

Product page

Datasheet

Key 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 ADP2371
Synchronizable to an external clock
8-lead, 0.75 mm x 3 mm x 3mm 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

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