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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
) `$ g2 P, F( ]# b*3.6V to 15V Input Voltage Range C' e1 o8 M: t, r8 R. s
*3A Output Current per Channel
+ @6 Y* X- t( k* v' H5 U*Up to 95% Efficiency
3 x( H1 K0 ~& T( l0 a( |$ s*Low Duty Cycle Operation: 5% at 2.25MHz% b5 b4 ~& y; }9 F1 t) i/ m& D
*Selectable 0°/180°Phase Shift Between Channels( q, t9 N! j3 h" t
*Adjustable Switching Frequency: 500kHz to 4MHz
1 B' ^* N* p+ c: o* W" R* T9 y! w*External Frequency Synchronization2 a1 P8 ?1 ?7 N) v: h7 a
*Current Mode Operation for Excellent Line and Load Transient Response f/ n J l1 r7 l, Y
* 0.6V Reference Allows Low Output Voltages* s4 o4 x* D% }5 u9 _
*User Selectable Burst Mode Operation or Forced Continuous Operation3 L' C2 O5 ]$ k' j% S
*Output Voltage Tracking and Soft-Start Capability1 |9 r8 L/ [7 J7 E4 O
*Short-Circuit Protected0 A! e- k$ m, Z8 `: t5 M! |
*Overvoltage Input and Overtemperature Protection2 B3 m( ~2 t- k2 A8 M4 M
*Low Power 2.5V Linear Regulator Output
6 Y" }7 S$ ]1 y1 U) ~9 U% j$ z5 d+ R: v*Power Good Status 0utputs) T$ k! t. n' g) `" S% N" K
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
; G2 B5 L2 {( I. f- mDESCRIPTION+ E/ L- J4 `" ~! Z
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.
! A3 k% s* p# FThe 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 E+ O4 \" J5 |" S! F3 iThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
5 ^7 p% T( s9 Z0 P% |APPLICATIONSD( z% `/ ^/ R, R3 a' b w
istributed Power Systems
" F' G/ F5 E7 M, G% G7 k1 D( _Battery Powered Instruments! t2 r k; P, s* k
Point of Load Power Supplies
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