The ZCC3605A is a high efficiency, monolithic synchro- nous buck regulator using a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple ZCC3605A regula- torsto run out of phase while using minimal input and output capacitance. The operating supply voltage range is from 20V down to 4V, making it suitable for dual, triple or quadruple lithium-ion battery inputs as well as point of load power supply applicationsfrom a 12V or 5V rail. The operating frequency is programmable from 800kHz to 4MHzwithanexternalresistor.Thehighfrequency capa- bilityallowstheuseofsmallsurfacemountinductors.For switching noise sensitive applications, it can be externally synchronized from 800kHz to 4MHz. The PHMODE pin allows user control ofthe phase ofthe outgoing clock signal. The unique constant frequency/controlled on-time architectureisidealforhighstep-downratioapplications that are operating at high frequency while demanding fast transient response. Two internal phase-lock loops synchronize the internal oscillator to the externalclock and also servosthe regulator on-time to lockon toeither theinternalclockortheexternal clock ifit’spresent.

FeaTures

n High Efficiency: Up to 96%

n 5A Output Current

n 4V to 20V VIN Range

n Integrated Power N-Channel MOSFETs

(70mΩ Top and 35mΩ Bottom)

n Adjustable Frequency 800kHz to 4MHz

n PolyPhaseOperation (Up to 12 Phases)

n Output Tracking

n 0.6V ±1% Reference Accuracy

n Current Mode Operation for Excellent Line and Load

Transient Response

n Shutdown Mode Draws Less Than 15µA Supply Current

n ZCC3605: 15V Absolute Maximum VIN

n ZCC3605A: 22V Absolute Maximum VIN

n The ZCC3605A Is Pin Compatible with the

ZCC3605

n Available in 24-Pin (4mm ´ 4mm) QFN Package

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