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2022-8-5 15:55 |
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FEATURES& |) t- G; D0 e3 H* K/ G9 ~2 G
*3.6V to 15V Input Voltage Range
! i2 X2 T& S* X) l; F* E t! m*3A Output Current per Channel! `0 _; B# @0 }3 x
*Up to 95% Efficiency
, {. A0 ` e, J' H D. c$ ^*Low Duty Cycle Operation: 5% at 2.25MHz. e- z+ ?4 x; y5 \
*Selectable 0°/180°Phase Shift Between Channels5 p: _: {+ s. E9 a* T2 f
*Adjustable Switching Frequency: 500kHz to 4MHz0 y' C) R* a7 Y; G
*External Frequency Synchronization4 I3 v5 W1 ^7 Q9 a8 M# v+ j
*Current Mode Operation for Excellent Line and Load Transient Response
) `# R' y; T4 R9 ]2 g. {9 J8 C9 z+ l* 0.6V Reference Allows Low Output Voltages2 T) y/ M8 ]* ?
*User Selectable Burst Mode Operation or Forced Continuous Operation
8 m, Y' G; `) X" w5 } w*Output Voltage Tracking and Soft-Start Capability
. o. _- P9 ?3 ?$ m*Short-Circuit Protected
1 n4 U7 \ H) c# R) B*Overvoltage Input and Overtemperature Protection
2 l# J8 ?6 s" i# t* Q*Low Power 2.5V Linear Regulator Output
6 K4 C0 D# y' G$ ~% O*Power Good Status 0utputs& t! F9 @ M2 E: E# j5 ^
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
( [, k! p' j# o$ o2 _DESCRIPTION
& H8 f# O' I b$ o9 |" GTheZCC3633 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.
, G+ t1 N' t2 l# UThe 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." Z6 G- {8 j% T& b! R; c; ?
The ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation& b K: {7 Z* d. e2 H6 {
APPLICATIONSD% _! D$ N& x" S0 X; }+ a
istributed Power Systems: h8 p. G7 w# H( i. J
Battery Powered Instruments. Z, a+ T, t) f" J/ Z# T7 e8 v
Point of Load Power Supplies3 x' m5 Y9 h6 \: y3 h: Y! |' q/ i
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