RY3408
RY3408 is 5.5V 1A 1.5MHz Synchronous Step-Down Regulator manufactured by RYCHIP.
Features
- 2.5V to 5.5V Input Voltage Range
- 1A Continuous Output Current
- 1.5MHz Switching Frequency
- Built-in Short Protection
- Built-in Over Current Limit
- Built-in Over Voltage Protection
- PFM Mode for High Efficiency in Light Load
- Internal Soft-Start
- High Efficiency: Up to 96%
- Output Adjustable from 0.6V
- No Schottky Diode Required
- Over Temperature Protected
- Low Quiescent Current: 40μA
- Available in SOT23-5 package
- -40°C to +85°C Temperature Range
Applications
- Cellular and Smart Phones
- Wireless and DSL Modems
- PDAs
- Portable Instruments
- Digital Still and Video Cameras
- PC Cards
General Description
The RY3408 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 40u A and drops to <1u A in shutdown. The 2.5V to 5.5V input voltage range makes the RY3408 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 1.5MHz, allowing the use of small surface mount inductors and capacitors. Low output voltages are easily supported with the 0.6V feedback reference voltage. The RY3408 requires a minimal number of readily available, external ponents and is available in a space saving SOT23-5 package.
Typical Application Circuit
ON/ OFF
L1 R1 CFF R2
VOUT COUT
Basic Application Circuit
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5.5V 1A 1.5MHz Synchronous Step-Down Regulator
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