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2022-8-5 15:55 |
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FEATURES
! Y! Q; N& S" i4 r( {*3.6V to 15V Input Voltage Range& n% Z5 M7 H/ y. U1 K) A
*3A Output Current per Channel% s, Q# z2 b8 |% c: J! x
*Up to 95% Efficiency
# N# m& B* @1 t4 e3 h7 f2 ^! ~*Low Duty Cycle Operation: 5% at 2.25MHz( Y2 ^5 R+ L1 Z% A) ]( F% [, W% V
*Selectable 0°/180°Phase Shift Between Channels+ V3 I4 D; O+ @$ x
*Adjustable Switching Frequency: 500kHz to 4MHz3 V! Y$ O- q5 x3 u0 y
*External Frequency Synchronization5 T/ ]# L& h6 B7 D. g
*Current Mode Operation for Excellent Line and Load Transient Response2 d/ T& O) B5 |/ K0 W
* 0.6V Reference Allows Low Output Voltages- v* m' T7 Y7 ?+ r$ W( Z
*User Selectable Burst Mode Operation or Forced Continuous Operation/ E5 y4 X" L& U% ?: a
*Output Voltage Tracking and Soft-Start Capability
. q8 f2 S' X* x4 e*Short-Circuit Protected
% c# E5 c8 i) }# l& @+ h*Overvoltage Input and Overtemperature Protection
, L, c' `* V# Y2 F: _! K*Low Power 2.5V Linear Regulator Output$ d3 n) T% b9 M0 q2 B& h% o
*Power Good Status 0utputs$ C8 W5 L% _' D* Y: @/ F) S& X+ C
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
( Q( d E7 I% z' p a/ FDESCRIPTION; h6 g2 g" X* e- J8 q
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.6 @" G! T+ \4 v6 O
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.5 x, w1 c( H& V
The ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
7 P5 x3 s4 [+ nAPPLICATIONSD; u3 G* B, a; [0 G4 t' {
istributed Power Systems: G& Z0 m! l. P! ^; U- h
Battery Powered Instruments2 h7 i p& r% A* x/ W9 {
Point of Load Power Supplies
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