描述 Description

The SC21156A is an ultra-high efficiency 1.2A DC/DC buck regulator available in a small MLPD package. These features make the SC21156A perfect for small form factor consumer applications where high efficiency is essential. SC21156A is an adaptive on-time 4MHz switching regulator at full load conditions. Under light load conditions, it transits into PFM power save mode and reduces switching frequency thus saving energy. High switching frequency operation allows the use of a very small 0.47μH inductor along with small input and output capacitors to minimize overall circuit?size.

特性 Features

? Input voltage range — 2.3V to 5.5V
? 1.2A continuous output current
? 4MHz switching frequency
? Adjustable output voltage
? 1% output voltage accuracy
? Adaptive on-time architecture
? Up to 100% duty cycle
? Up to 96% peak efficiency
? Power save mode for efficient light load operation
? >90% efficiency 30mA to 75mA
? 0.1μA shutdown current
? 21μA quiescent current
? Force PWM pin
? Pre-bias startup protection
? Internal soft start
? 1.5mm x 2mm, 6-Lead MLPD package
? WEEE and RoHS compliant and halogen-free

應(yīng)用 Application

·Tablet PCs

·GPS devices

·Battery powered equipment

·Portable devices

·Smart phones

·Wearable electronics