FeaTures
High Efficiency: Up to 96%
5A Output Current
4V to 20V V IN Range
Integrated Power N-Channel MOSFETs
(70mΩ Top and 35mΩ Bottom)
Adjustable Frequency 800kHz to 4MHz
PolyPhase ® Operation (Up to 12 Phases)
Output Tracking
0.6V ±1% Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
ShutdownModeDrawsLessThan15µASupplyCurrent
ZCC3605: 15V Absolute Maximum V IN
ZCC3605A: 22V Absolute Maximum V IN
The ZCC3605AIs Pin Compatible with the
ZCC3605
Available in 24-Pin (4mm 4mm) QFN Package
applicaTions
Point of Load Power Supply
Portable Instruments
Distributed Power Systems
Battery-Powered Equipment
20V, 5A Synchronous Step-Down Regulator
DescripTion
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- torstorunoutofphasewhileusing
minimal input and output capacitance. The operating
supply voltage range isfrom 20V down to 4V, making it
suitable for dual, triple or quadruple lithium-ion
battery inputs as well as point of load power supply
applicationsfroma12Vor5Vrail.
The operating frequency is programmable from 800kHz to
4MHzwithanexternalresistor.Thehighfrequencycapa-
bilityallowstheuseofsmallsurfacemountinductors.For
switching noise sensitive applications, it can be externally
synchronized from 800kHz to 4MHz. The PHMODE pin
allowsusercontrolofthephaseoftheoutgoingclock
signal. The unique constant frequency/controlledon-time
architectureisidealforhighstep-downratioapplications
that are operating at high frequency while demanding
fast transient response. Twointernal phase-lock loops
synchronize the internal oscillator to the externalclock
andalsoservostheregulatoron-timetolockontoeither
theinternalclockortheexternalclockifit’spresent.
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