ZCC3633双通道3A，15V单片同步降压替代LTC3633

四维电子

FEATURES
/ K: ~; B& V# r8 O*3.6V to 15V Input Voltage Range
/ W  x1 D' b6 t*3A Output Current per Channel
, y' y) S& v8 u*Up to 95% Efficiency
*Low Duty Cycle Operation: 5% at 2.25MHz
; @& y2 [( T! a*Selectable 0°/180°Phase Shift Between Channels
, e: ]  X  [: m# ?9 {$ H" M( X*Adjustable Switching Frequency: 500kHz to 4MHz
) B, k$ C! S: K6 r! X: M*External Frequency Synchronization
*Current Mode Operation for Excellent Line and Load Transient Response
. P" H9 x9 S0 R5 V+ t3 o* 0.6V Reference Allows Low Output Voltages
/ ^3 L3 s+ {5 e) V2 V*User Selectable Burst Mode Operation or Forced Continuous Operation
*Output Voltage Tracking and Soft-Start Capability
1 E6 o' ?8 p% P: B*Short-Circuit Protected
*Overvoltage Input and Overtemperature Protection
*Low Power 2.5V Linear Regulator Output
! |0 B+ c: |' |4 n* Q7 A*Power Good Status 0utputs
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
& P3 b5 B3 e) G, M8 w1 b* z/ q) H8 `DESCRIPTION
! H1 c( J. H+ l1 ^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.
The 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.
6 D2 `5 }/ L# A! z3 QThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
7 q# d: C% R$ H1 ~5 |APPLICATIONSD
) U1 g- P+ M" S! T* C1 ]istributed Power Systems
) X( H; t0 Q4 `, {6 CBattery Powered Instruments
Point of Load Power Supplies
! Q  B, c; r5 V+ n