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FEATURES. N) ]7 E) O' H* y, v* @: B
*3.6V to 15V Input Voltage Range- b5 A- i6 D& l2 {2 X0 {
*3A Output Current per Channel
7 x3 N" ^) a2 ~*Up to 95% Efficiency
- p9 m, }3 D/ Z*Low Duty Cycle Operation: 5% at 2.25MHz
9 F! M8 R/ z* @! a# S* N6 K*Selectable 0°/180°Phase Shift Between Channels7 _2 V4 B; `9 Z" ?- Q9 F! u0 Z
*Adjustable Switching Frequency: 500kHz to 4MHz) z2 T+ X8 {! E: n. S
*External Frequency Synchronization! \0 _1 g; ]5 W2 ~
*Current Mode Operation for Excellent Line and Load Transient Response
; ^' H! C- B$ P8 k* 0.6V Reference Allows Low Output Voltages" X8 B* J8 n* @7 l2 e7 z
*User Selectable Burst Mode Operation or Forced Continuous Operation
0 @: N: @& A7 h+ G7 h* H*Output Voltage Tracking and Soft-Start Capability
! M" ^1 G6 M' G% Y8 l+ H*Short-Circuit Protected$ V9 f9 @4 ^8 F# V. D( _7 k
*Overvoltage Input and Overtemperature Protection# E/ S& ^1 u0 \! R
*Low Power 2.5V Linear Regulator Output6 h, G: L7 ?: r
*Power Good Status 0utputs
2 q0 h* ^0 a$ o, l*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages7 k3 c1 ~1 Y1 q/ K8 `( P+ E
DESCRIPTION5 T. O6 V6 D1 G6 P$ a, G' F4 L
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.0 r: T0 g# I( t- H( Z; W3 Q* p
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.9 |$ T0 i; h C8 `! R
The ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation: p. L3 G) N8 f$ S9 y" S: C5 e# B3 H
APPLICATIONSD* s( j7 i- ~7 X0 D/ l. x
istributed Power Systems( R9 P+ S; B% D1 D$ {1 b
Battery Powered Instruments8 U; T1 P. z: b
Point of Load Power Supplies
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