ZCC3633双通道3A，15V单片同步降压替代LTC3633

四维电子

FEATURES
* 3.6V to 15V Input Voltage Range * 3A Output Current per Channel
* Up to 95% Efficiency
0 \5 x9 g5 K9 D; L+ d) X7 c! I* Low Duty Cycle Operation: 5% at 2.25MHz
* Selectable 0°/180° Phase Shift Between Channels
7 }; }4 Y* P- T# Y' {: D" d  q* Adjustable Switching Frequency: 500kHz to 4MHz
$ \  ~! j" N5 C9 H& y! l* External Frequency Synchronization
* Current Mode Operation for ExcellentLine andLoad Transient Response
6 W/ B: N3 C# z. I9 j' ~- X( Q  S* 0.6V Reference Allows Low Output Voltages
6 }+ c: m! ^, f7 G8 }+ d9 U1 X  [* User Selectable Burst Mode® Operation or Forced C ontinuous Operation
* Output Voltage Tracking and Soft-Start Capability
* Short-Circuit Protected * Overvoltage Input and Overtemperature Protection
7 d5 z! S( B1 i7 k, \/ O* Low Power 2.5V Linear Regulator Output
* Power Good Status Outputs
* Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages
DESCRIPTION
: [1 M! s1 o; b2 GTheZCC3633isahighefficiency,dual-channelmonolithic 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.Theoperatingsupplyvoltagerangeisfrom3.6V 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
# [, p1 m9 |  O% n: [  p+ HTheoperatingfrequencyisprogrammableandsynchroniz-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 ideal for high step-downratioapplicationsthatoperateathighfrequency whiledemandingfasttransientresponse.Aninternalphase lock loop servos the on-time ofthe internal one-shottimer to match the frequency of the internal clock or an applied external clock.
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