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2022-8-5 15:55 |
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Features% I. @/ v, U& ~! B
n Dual, 180° Phased Controllers Reduce Required5 D# Y4 f, i3 ^
Input Capacitance and Power Supply Induced Noise
) R. ?9 @7 a, E5 O& On High Efficiency: Up to 95%: ~: d n5 i. R* @, f
n RSENSE or DCR Current Sensing
E- Q) u. a2 b3 Y7 bn Programmable DCR Temperature Compensation; o* C; s2 B [) R5 z( y+ ~
n ±0.75% 0.6V Output Voltage Accuracy/ C) P8 s' n8 |+ @0 i. j/ u& G% A
n Phase-Lockable Fixed Frequency 250kHz to 770kHz) z W8 S. u& R0 Z
n True Remote Sensing Differential Amplifier
7 U* o" X0 T7 l4 R$ T: ln Dual N-Channel MOSFET Synchronous Drive4 ^" h; q# x- ^& l$ z: [
n Wide VIN Range: 4.5V to 38V
+ ]- S1 s' a) q/ f5 M8 l2 mn VOUT Range: 0.6V to 12.5V without Differential Amplifier1 J4 \1 f0 F# R+ c2 h9 F* ?% m$ |
n VOUT Range: 0.6V to 3.3V with Differential Amplifier
% H8 z8 }8 b' ]) m8 M# Y" [6 vn Clock Input and Output for Up to 12-Phase Operation
5 s& z" k) G. ~% E/ `1 t( pn Adjustable Soft-Start or VOUT Tracking+ T; H3 ^1 l6 @! K0 w: a
n Foldback Output Current Limiting) s/ I/ P- m+ \& h
n Output Overvoltage Protection/ r( L% o, T- } T; P
n 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package& P5 a' i6 P# T4 l l
Descriptio* v# x& t) X4 ^7 t; V
The ZC3855 is a dual PolyPhase® current mode synchro* @$ W" p, X4 G! s" D" ]! g
nous step-down switching regulator controller that drives
- H! Z2 b' l3 Jall N-channel power MOSFET stages. It includes a high& V/ t; F2 v7 G+ n: `7 t
speed differential remote sense amplifier. The maximum
" s# i9 m1 m& T: H, Z w& qcurrent sense voltage is programmable for either 30mV,5 N( ?- I! D# o( @3 E9 j3 k
50mV or 75mV, allowing the use of either the inductor DCR2 q I& o7 C( A' D
or a discrete sense resistor as the sensing element.
- j2 |- L. E! H8 H6 m) rThe ZC3855 features a precision 0.6V reference and can
/ x" m9 Z8 ^/ A" t& ^* Pproduce output voltages up to 12.5V. A wide 4.5V to 38V
+ Z0 }4 R2 V/ d8 dinput supply range encompasses most intermediate bus- P" G: W8 w! N3 E6 e9 g1 @
voltages and Battery chemistries. Power loss and supply4 Z" d" b) r- S( N! E5 H
noise are minimized by operating the two controller output. `6 L) D# C$ t4 d
stages out of phase. Burst Mode® operation, continuous ]! i' V+ l( B& y
or pulse-skipping modes are supported.
0 | B) ?7 ?! UThe ZC3855 can be configured for up to 12-phase op
5 K- }# \3 Q Ieration, has DCR temperature compensation, two power5 k; A$ _ O5 R* I' r; y
good signals and two current limit set pins. The ZC3855
7 k% T: w; z, z/ _, ~1 A( w- Q* His available in low profile 40-pin 6mm × 6mm QFN and
0 G4 p2 X! R2 C& ^* X. d( x38-lead exposed pad FE packages.$ A. Z$ T3 O4 U; c% d |* n. J
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