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
9 _6 J* o0 [; G# o/ j9 i" l* Up to 95% Efficiency
* Low Duty Cycle Operation: 5% at 2.25MHz
* Selectable 0°/180° Phase Shift Between Channels
* Adjustable Switching Frequency: 500kHz to 4MHz
4 e8 w$ F: q* V. y  O( ^* External Frequency Synchronization
* Current Mode Operation for ExcellentLine andLoad Transient Response
# e5 A( ^/ S! j4 P* O& U* 0.6V Reference Allows Low Output Voltages
* User Selectable Burst Mode® Operation or Forced C ontinuous Operation
" L$ ]. R& K, m3 l6 i: t: H- X* Output Voltage Tracking and Soft-Start Capability
# A) U' ^4 ~  r: a3 z9 X* Short-Circuit Protected * Overvoltage Input and Overtemperature Protection
* Low Power 2.5V Linear Regulator Output
* Power Good Status Outputs
; z! y5 h- t% a3 Y6 V7 E9 W* Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages
" o  M8 _# e+ h  |' P. k2 ^DESCRIPTION
, W  v9 _/ R  s  y% yTheZCC3633isahighefficiency,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
. \) |4 [  \" }$ p4 o" x5 dTheoperatingfrequencyisprogrammableandsynchroniz-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.