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
! _7 `, t6 J' Z9 j3 o- m) V, _8 D*3A Output Current per Channel
5 J$ k5 k5 g4 P4 W+ V' N; l*Up to 95% Efficiency
" E8 w8 [0 a1 o6 ?9 V*Low Duty Cycle Operation: 5% at 2.25MHz
*Selectable 0°/180°Phase Shift Between Channels
*Adjustable Switching Frequency: 500kHz to 4MHz
*External Frequency Synchronization
*Current Mode Operation for Excellent Line and Load Transient Response
* 0.6V Reference Allows Low Output Voltages
' M+ B; f' t+ d  J! b! ?*User Selectable Burst Mode Operation or Forced Continuous Operation
4 E! P0 @/ E* `; a) e8 t*Output Voltage Tracking and Soft-Start Capability
* w9 \2 O! o) ^& U( z- y) e*Short-Circuit Protected
*Overvoltage Input and Overtemperature Protection
*Low Power 2.5V Linear Regulator Output
*Power Good Status 0utputs
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
/ m: O+ x. ^/ o- W8 {# aDESCRIPTION
8 W9 v8 w4 B; x7 ]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.
, q& s! |( I/ CThe 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 K- I5 l: l% LThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
# g4 t$ ~6 Q9 }# V) YAPPLICATIONSD
istributed Power Systems
Battery Powered Instruments
Point of Load Power Supplies
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