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2022-8-5 15:55 |
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FEATURES% s! Q" y8 O9 O, s. r
*3.6V to 15V Input Voltage Range
z( l0 N z: Y" o! R1 ]*3A Output Current per Channel3 _& _6 e; ~( r8 A
*Up to 95% Efficiency
2 s5 K4 H7 P! M+ ?*Low Duty Cycle Operation: 5% at 2.25MHz9 ]# i9 \! W& y' e0 m" L8 H
*Selectable 0°/180°Phase Shift Between Channels
% @& m( K% w/ r$ y5 w( O7 [3 N*Adjustable Switching Frequency: 500kHz to 4MHz( t' b; L- N0 @, l" ~8 b) j4 G
*External Frequency Synchronization$ h5 W4 j+ X+ ~
*Current Mode Operation for Excellent Line and Load Transient Response, f. d/ p" [1 p! X) Z" p
* 0.6V Reference Allows Low Output Voltages8 ^# }; e9 k* m8 w2 p; I- v
*User Selectable Burst Mode Operation or Forced Continuous Operation
1 v( I/ I9 p9 L/ m& I. ]*Output Voltage Tracking and Soft-Start Capability5 ^' j# S0 S$ x7 G8 V2 P. _4 q
*Short-Circuit Protected
* m7 y S9 w- {1 z5 l! J9 k B*Overvoltage Input and Overtemperature Protection/ k1 C2 o! S! n8 D' n
*Low Power 2.5V Linear Regulator Output8 K5 H0 u) q0 [. |1 J
*Power Good Status 0utputs
$ m* c, K, c2 _! g; }*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages7 P$ `4 k3 X4 o; W
DESCRIPTION
2 B j7 q, K/ kTheZCC3633 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 e0 A: K$ B) W. LThe 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.
5 c% h1 i6 g1 T( EThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation9 [+ _" n# F! w- l t, N
APPLICATIONSD$ f: k m, G0 T8 N# r/ r9 C( g0 [/ W! H
istributed Power Systems' Q! V/ X1 c; i/ `
Battery Powered Instruments0 \" b g* L: U# u1 H' _. q# l
Point of Load Power Supplies" B: h+ Q" }" n v% x
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