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2022-8-5 15:55 |
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FEATURES
6 n, E) w6 m. _& S$ U! O3 ?, ~5 ^*3.6V to 15V Input Voltage Range2 w5 j% j; O# [8 F1 F. e4 m6 A: ]
*3A Output Current per Channel
3 p. |4 l( a$ p; m* b*Up to 95% Efficiency: j9 B2 T1 S) j8 P H$ l; c7 S
*Low Duty Cycle Operation: 5% at 2.25MHz0 A' E# {! ~# K! M; p$ c" v
*Selectable 0°/180°Phase Shift Between Channels" Z1 o5 E! Y! @" d9 D9 c( q
*Adjustable Switching Frequency: 500kHz to 4MHz
7 b# E7 F& V" V" Z; Q* N*External Frequency Synchronization, J( T7 T$ k. N0 _
*Current Mode Operation for Excellent Line and Load Transient Response( R) f8 w2 ~4 L# [0 F4 |- q3 q4 e
* 0.6V Reference Allows Low Output Voltages* m. r. U7 P+ w3 l2 n" O
*User Selectable Burst Mode Operation or Forced Continuous Operation' Q, A& B1 h+ Q' T9 W4 I
*Output Voltage Tracking and Soft-Start Capability
3 Y8 ]. z8 W# r* [$ N*Short-Circuit Protected
0 H+ L, S. F5 \% y3 p+ D*Overvoltage Input and Overtemperature Protection
4 e/ e9 B B$ q4 m*Low Power 2.5V Linear Regulator Output- o4 Q; h9 d' J% q
*Power Good Status 0utputs" p0 P8 E) ~3 k. z
*Available in(4mmX5mm) QFN-28 and 28-Lead TSS OP Packages" G% a4 G. z4 ]) j
DESCRIPTION
$ ] `; w0 |6 |0 w, o/ oTheZCC3633 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 U1 k5 A: }3 n- n3 |" O& g- A n
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.
/ v. [/ p! ^- Q0 c7 C- e: A' QThe ZCC3633 can select between forced continuous mode andhigh efficiency Burst Mode operation
% \2 r3 T8 b9 T+ O0 BAPPLICATIONSD0 `2 b0 w) T* z; E
istributed Power Systems" L. L1 i2 S1 q/ F7 w& B, i
Battery Powered Instruments
$ o" v2 u+ y; k, R; e. DPoint of Load Power Supplies" p: K4 U9 {% I- }! P
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