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    The RY3420 is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to <1uA in shutdown. The 2.3V to 6V input voltage range makes the RY3420 ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications.

    Switching frequency is internally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors.Low output voltages are easily supported with the 0.6V feedback reference voltage.

    The RY3420 is offered in a low profile (1mm) 5-pin, thin SOT package, and is available in an adjustable version.

RY3420 Features:

High Efficiency: Up to 96%

2.5V to 5.5V Input Voltage Range

1.2MHz Constant Frequency Operation

No Schottky Diode Required

Low Dropout Operation: 100% Duty Cycle

PFM Mode for High Efficiency in Light Load

Over Temperature Protected

Low Quiescent Current: 40μA 

Short Circuit Protection

Inrush Current Limit and Soft Start

2A Continuous Output Current

SOT23-5 package

RY3420 Applications:

Cellular and Smart Phones

Wireless and DSL Modems

PDAs

Portable Instruments

Digital Still and Video Cameras

PC Cards

RY3420 Typical Application Circuit:

RY3420 Pin Description:

RY3420 Order Information:

Part No.	Model	Description	Package	MOQ
70301003	RY3420	RY3420 Buck, 2.5-5.5V, 2A, 1.2MHz, VFB 0.6V, SOT23-5	SOT23-5	3000PCS

RY3420 Functional Block Diagram:

RY3420 Package Description: