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FEATURES8 V" m3 N, e7 ^$ e6 z3 L$ a
*3.6V to 15V Input Voltage Range, x* Y3 |! g; x* ?! |& v# ^* Q
*3A Output Current per Channel
6 P% \* u- h5 i0 Q: F, ~*Up to 95% Efficiency7 a" x- H- b; w+ n
*Low Duty Cycle Operation: 5% at 2.25MHz
/ c: S2 }2 c& d9 `- ]*Selectable 0°/180°Phase Shift Between Channels
3 M8 N0 ~/ c% }% q+ ~: @*Adjustable Switching Frequency: 500kHz to 4MHz3 B7 K8 j! e) h- `* @/ o7 r! U# X
*External Frequency Synchronization
" e8 M, J: x) q2 A" ]1 A0 W; b*Current Mode Operation for Excellent Line and Load Transient Response+ T- u0 S% W/ Z- b0 s L
* 0.6V Reference Allows Low Output Voltages
( p* ?- u: {+ C/ L/ j5 ~*User Selectable Burst Mode Operation or Forced Continuous Operation+ a0 c. @+ s1 }6 c7 n4 E) F( Q
*Output Voltage Tracking and Soft-Start Capability( b- n# U m p3 _, w+ w
*Short-Circuit Protected' N* z0 t8 F+ c L2 w9 v3 @
*Overvoltage Input and Overtemperature Protection
5 S0 d' F9 b7 ?# f4 n4 J' |) \*Low Power 2.5V Linear Regulator Output% ^5 ]; M6 h9 j2 u3 v
*Power Good Status 0utputs
( C6 B) C- i8 _( p* w& y6 y9 v0 L*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages
) r3 d# t/ n1 d: G5 NDESCRIPTION
, R5 \" u' w5 u, ~3 h2 Z) XTheZCC3633 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.; k( ?6 }/ n7 n% O1 M
The 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.) k7 d* k1 k% B
The ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
4 }, H) r- g! b9 a yAPPLICATIONSD2 x3 R, h8 P: {6 [. d
istributed Power Systems. l" l: L3 E3 r- c9 W; s% f) c5 ^) b8 ^
Battery Powered Instruments
+ f0 G8 }; K5 x; y. B, O+ ~- ePoint of Load Power Supplies
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