ADP2371
PRODUCTIONHigh Voltage, 1.2 MHz/600 kHz, 800 mA, Low Quiescent Current Buck Regulator with Quick Output Discharge Function
- Part Models
- 4
- 1ku List Price
- Starting From $1.90
Overview
- 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 × 3mm LFCSP (QFN) package
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 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.
The ADP2370/ADP2371 offer multiple options for setting the operational frequency. The ADP2370/ADP2371 can be synchronized 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 automatically 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 overload 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.
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
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| ADP2371ACPZ-1.2-R7 | 8-Lead LFCSP (3mm x 3mm w/ EP) | ||
| ADP2371ACPZ-1.8-R7 | 8-Lead LFCSP (3mm x 3mm w/ EP) | ||
| ADP2371ACPZ-3.3-R7 | 8-Lead LFCSP (3mm x 3mm w/ EP) | ||
| ADP2371ACPZ-R7 | 8-Lead LFCSP (3mm x 3mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 6, 2014 - 13_0223 Assembly and Test Transfer of Select 2x3mm and 3x3mm LFCSP Products to STATS ChipPAC China |
||
| ADP2371ACPZ-1.2-R7 | PRODUCTION | |
| ADP2371ACPZ-1.8-R7 | PRODUCTION | |
| ADP2371ACPZ-3.3-R7 | PRODUCTION | |
| ADP2371ACPZ-R7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice
Models for the following parts are available in LTspice:
- ADP2371-1.2
- ADP2371-1.8
- ADP2371-3.3
- ADP2371-ADJ
SIMPLIS Models 1
ADP237x Buck Regulator Design Tool
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
Open ToolLTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
ADP2370/ADP2371 Evaluation Board