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
* 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 ExcellentLine andLoad Transient Response
* 0.6V Reference Allows Low Output Voltages
* 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
* Low Power 2.5V Linear Regulator Output
* Power Good Status Outputs
* Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages
DESCRIPTION
TheZCC3633isahighefficiency,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
Theoperatingfrequencyisprogrammableandsynchroniz-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.