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FeaTures
2 q0 U7 J9 x2 R3 M9 ~High Efficiency: Up to 96%5A Output Current4V to 20V VIN RangeIntegrated Power N-Channel MOSFETs(70mΩ Top and 35mΩ Bottom)Adjustable Frequency 800kHz to 4MHzPolyPhase®Operation (Up to 12 Phases)Output Tracking0.6V ±1% Reference AccuracyCurrent Mode Operation for Excellent Line and LoadTransient ResponseShutdown Mode Draws Less Than 15µA Supply CurrentZCC3605: 15V Absolute Maximum VINZCC3605A: 22V Absolute Maximum VINThe ZCC3605A Is Pin Compatible with theZCC3605Available in 24-Pin (4mm 4mm) QFN Package3 z& T- A, q/ x. K: i
DescriTion- n5 z/ ^! s z) X" _0 l
The ZCC3605A is a high efficiency, monolithicsynchro- nous buck regulator using a phase lockablecontrolled on-time constant frequency, current modearchitecture. PolyPhase operation allows multipleZCC3605A regula- torsto run out of phase while usingminimal input and output capacitance. The operatingsupply voltage range is from 20V down to 4V, making itsuitable for dual, triple or quadruple lithium-ionbattery inputs as well as point of load power supplyapplicationsfrom a 12V or 5V rail. The operating frequency is programmable from 800kHz to4MHzwithanexternalresistor.Thehighfrequency capa- bilityallowstheuseofsmallsuRFacemountinductors.Forswitching noise sensitive applications, it can be externallysynchronized from 800kHz to 4MHz. The PHMODE pinallows user control ofthe phase ofthe outgoing clocksignal. The unique constant frequency/controlled on-timearchitectureisidealforhighstep-downratioapplicationsthat are operating at high frequency while demandingfast transient response. Two internal phase-lock loopssynchronize the internal oscillator to the externalclockand also servosthe regulator on-time to lockon toeithertheinternalclockortheexternal clock ifit’spresent., M% w" @1 P; j; X# o
applicaTions: o x" |/ \* z
Point of Load Power SupplyPortable InstrumentsDistributed Power SystemsBattery-Powered Equipment$ m3 c' A2 ~2 O- F9 ]2 f% }
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