ZCC3633双通道3A，15V单片同步降压替代LTC3633

四维电子

FEATURES
: k+ `; I% M4 `2 H8 o9 I/ p*3.6V to 15V Input Voltage Range
! d# C/ X4 s0 s5 @& x/ p8 d*3A Output Current per Channel
7 ^9 ~  {' v5 N' K# V) r*Up to 95% Efficiency
. y3 P; ~% L( e6 q" b7 ]; t* M, q*Low Duty Cycle Operation: 5% at 2.25MHz
& S6 }! x, B1 s1 B8 E% E*Selectable 0°/180°Phase Shift Between Channels
3 M" I0 v+ {- C7 e) n/ ]5 ^*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
- p- E+ I  b$ l7 E$ J/ u1 b*User Selectable Burst Mode Operation or Forced Continuous Operation
# W- @/ v7 x& v# c& x# R) T, B! _: R*Output Voltage Tracking and Soft-Start Capability
9 \/ b0 }" N- w# z! E0 Q) S% f*Short-Circuit Protected
6 K- x8 y3 J8 ^  F, b*Overvoltage Input and Overtemperature Protection
( ^: }, h( ?1 s( Y7 M*Low Power 2.5V Linear Regulator Output
; M& E9 z4 h5 P! X1 f' Q*Power Good Status 0utputs
, d: f8 C5 \$ E( A! `0 O- A*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
* r2 F! f( K( p3 O3 G! h5 pDESCRIPTION
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.
7 U, {- X& q, B$ w  l3 f# I) eThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
APPLICATIONSD
0 C# t5 r8 X* @4 y' `0 d: Iistributed Power Systems
! b- ~. E8 k% _- |1 p: d& b( j* FBattery Powered Instruments
Point of Load Power Supplies


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