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2022-8-5 15:55 |
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签到天数: 11 天 [LV.3]偶尔看看II
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FEATURES
% |5 S: P# T% v6 U3 Q*3.6V to 15V Input Voltage Range {# O& Q/ J0 h
*3A Output Current per Channel ]# k2 b3 b- {
*Up to 95% Efficiency3 ^- S8 L; P- L3 x) x) C" }2 i& D }
*Low Duty Cycle Operation: 5% at 2.25MHz
+ z/ N+ d: s j/ E; s- D, `*Selectable 0°/180°Phase Shift Between Channels5 E/ L/ j' `. Z- Q& A2 l
*Adjustable Switching Frequency: 500kHz to 4MHz
6 Z. j" c0 ]9 @+ ~% w- h9 Y, A {' V9 Y: K*External Frequency Synchronization @; f& Y M% h& i
*Current Mode Operation for Excellent Line and Load Transient Response1 l! g' }; b) R& j/ T
* 0.6V Reference Allows Low Output Voltages7 y1 p5 @7 E+ Y
*User Selectable Burst Mode Operation or Forced Continuous Operation! s4 u6 L5 X- F$ u+ N
*Output Voltage Tracking and Soft-Start Capability
% [$ S) u7 Y, `0 u9 M*Short-Circuit Protected Y- a3 {/ _# y7 n6 Q) d1 U% B
*Overvoltage Input and Overtemperature Protection L8 t1 ]2 E& W1 } F y
*Low Power 2.5V Linear Regulator Output
8 F6 p% b9 [/ X. H% }' \9 f, T*Power Good Status 0utputs
2 R, d v5 ^8 y+ a# j2 S& A' \*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages1 L' D; u8 s0 k7 g5 e$ {' I
DESCRIPTION
4 m+ o6 u: `8 s, s! ZTheZCC3633 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.
+ k8 g0 p, j L8 Y: AThe 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 v Y x, D. v( g
The ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation4 {8 y- O( n; U! `$ t' y2 R9 Y
APPLICATIONSD @+ u6 e" K$ N3 S% ~: V0 E
istributed Power Systems
8 a8 H% G5 L. Y7 j/ u# u- A5 \Battery Powered Instruments
. P9 ]3 V4 [ L: ?+ f+ A1 E) OPoint of Load Power Supplies
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