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
: O1 ~& ^- L0 f% X3 |+ J*Selectable 0°/180°Phase Shift Between Channels
/ S5 G4 ]5 F% a% H; y4 ~  L6 |9 ]: e& B*Adjustable Switching Frequency: 500kHz to 4MHz
. U" U$ \6 X; M, h  E*External Frequency Synchronization
*Current Mode Operation for Excellent Line and Load Transient Response
- X; `3 L  r! Q; k/ p5 I1 g* 0.6V Reference Allows Low Output Voltages
( T" n% E3 [$ Y3 C7 W*User Selectable Burst Mode Operation or Forced Continuous Operation
*Output Voltage Tracking and Soft-Start Capability
*Short-Circuit Protected
% O5 a1 `4 V0 v( R1 i8 l* c$ d5 n7 ?*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
DESCRIPTION
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.
8 m3 X0 k# g% D1 l) H* ]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.
, M% }* Q# k, T/ H  n; sThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
1 {; }  e3 f+ `APPLICATIONSD
istributed Power Systems
Battery Powered Instruments
; H( ~6 m7 j& L/ Q2 O6 a6 T4 A9 vPoint of Load Power Supplies