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FEATURES; S& N5 D. Z# G: {6 ^( T; r; U- P
*3.6V to 15V Input Voltage Range
; z4 K& w0 L- W*3A Output Current per Channel9 B" N' X) _2 h7 R) K6 b
*Up to 95% Efficiency
8 c, N. f6 S& ]9 G) J*Low Duty Cycle Operation: 5% at 2.25MHz2 s% ^. W# d0 R
*Selectable 0°/180°Phase Shift Between Channels
! p# X5 h6 C, Q1 E9 e*Adjustable Switching Frequency: 500kHz to 4MHz& o% Y9 t7 {: u4 K8 c
*External Frequency Synchronization/ \# R) N! G9 f$ l
*Current Mode Operation for Excellent Line and Load Transient Response6 r" q) M& D; Q6 T; ^1 D4 f. k
* 0.6V Reference Allows Low Output Voltages& G% ^8 ]+ N0 O: ]3 x% ?+ ~4 j+ N9 v
*User Selectable Burst Mode Operation or Forced Continuous Operation m" P8 g: o1 G, J
*Output Voltage Tracking and Soft-Start Capability
* B# ~! e J# F$ f2 c( b f7 y*Short-Circuit Protected: Y9 u- d2 U4 \/ R* S- f* k
*Overvoltage Input and Overtemperature Protection5 T' h b" b, ]& p0 F* }' a
*Low Power 2.5V Linear Regulator Output0 N! J/ k( G: V. O0 B6 I
*Power Good Status 0utputs9 _: Y# U2 o( i3 \
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
; D, O) |' s$ J# SDESCRIPTION% ^3 |1 }8 g) Y) U, q8 ?* V) y& p
TheZCC3633 is ahighefficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase, which relaxes the requirementsfor input and output ca-pacitance.The operating supply voltagerange isfrom3.6V to 15V making it suitable for dual cell lithium-ion batteries as well as point of load power supply applications froma 12V or 5V supply.; G, T- U" |- N/ A+ J
The operatingfrequencyis programmable and synchroniz-able from 500kHz to 4MHz with an external resistor The high frequencycapability allows the use of small suRFace mount inductors andcapacitors. The unique constant frequency/controlled on-time architecture is idealfor high step-down ratio applications thatoperate athighfrequency while demanding fasttransientresponse.An internal phase lock loop servos the on-time oftheinternal one-shottimer to match the frequency of the internal clock or an applied external clock.
* M: `3 q. u- w& r1 rThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation7 W# ^ N4 Z+ E( L* W" M$ e
APPLICATIONSD9 @; o& z6 V& N, G% k/ Z
istributed Power Systems
" T# u# z( D1 ?# d7 J* T" CBattery Powered Instruments
, Q; k2 O; O1 m! }' H9 c/ h4 e1 {Point of Load Power Supplies' L% t5 }2 N% Q9 G$ K0 d
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