ZCC3633双通道3A，15V单片同步降压替代LTC3633

四维电子

FEATURES
1 a' N5 A' `8 b4 i9 Q0 G7 E/ ]* 3.6V to 15V Input Voltage Range * 3A Output Current per Channel
* Up to 95% Efficiency
( Y  j+ M/ h9 |! I* Low Duty Cycle Operation: 5% at 2.25MHz
* Selectable 0°/180° Phase Shift Between Channels
* Adjustable Switching Frequency: 500kHz to 4MHz
* External Frequency Synchronization
7 I8 q* Q- p/ \4 v1 X; l% K, g* 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
3 f3 O/ @/ Q1 g8 x# U* Output Voltage Tracking and Soft-Start Capability
* Short-Circuit Protected * Overvoltage Input and Overtemperature Protection
- x' Y' l- B# d8 k+ n% x* Low Power 2.5V Linear Regulator Output
! p. r, A; J. N* N* Power Good Status Outputs
! s7 `6 q: X! \$ m, i* Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages
DESCRIPTION
' A8 T; {! y3 X& cTheZCC3633isahighefficiency,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
' n+ R( v9 T; c' D: v/ ]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.
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