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FEATURES9 c* B+ k. M# @2 k0 l8 T1 F' M; r
*3.6V to 15V Input Voltage Range
3 V% m" d. U8 w: E1 n*3A Output Current per Channel! D( R# ~3 X0 Y/ }: s0 q
*Up to 95% Efficiency% `4 |7 ^* L" V: t$ G8 b% [
*Low Duty Cycle Operation: 5% at 2.25MHz" ]% x0 w6 `" U$ n! @* h
*Selectable 0°/180°Phase Shift Between Channels
5 |) _5 N/ i" @# X' C*Adjustable Switching Frequency: 500kHz to 4MHz
# W) B+ Q' z8 H*External Frequency Synchronization& T; w j$ v' Z0 w8 y
*Current Mode Operation for Excellent Line and Load Transient Response% t/ ?( c: ~( Z0 V' ^
* 0.6V Reference Allows Low Output Voltages
: D1 o1 Z! U) ~*User Selectable Burst Mode Operation or Forced Continuous Operation* X# K! V' R4 p7 u3 G
*Output Voltage Tracking and Soft-Start Capability& }7 k- i' r0 `! l' e
*Short-Circuit Protected2 _( x- X; c3 |; ~+ ^6 k
*Overvoltage Input and Overtemperature Protection% h) P7 X+ { x8 O+ P; n, h) d
*Low Power 2.5V Linear Regulator Output' R6 j; I1 F7 T( _% s
*Power Good Status 0utputs) I/ ?: B; D# U- A
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
( o! W0 i8 g" M% `5 `DESCRIPTION
: s, h3 C3 \; E8 W* G% ^, n7 @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.
5 N# X) [" Y2 ^ w! `0 ?* vThe 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.
9 s/ D! e+ ^) ]% V( ~# nThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
8 i) J- Q$ g% T* f- t0 d2 B+ P3 S4 }APPLICATIONSD+ ^( C2 r1 Q4 F8 a) g1 Z% o2 Q
istributed Power Systems! @* O+ G* w9 ~' e+ `
Battery Powered Instruments- b9 f+ j! \* n7 k5 P6 U: x$ G5 Q
Point of Load Power Supplies, N/ D ]1 w8 B
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