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2022-8-5 15:55 |
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签到天数: 11 天 [LV.3]偶尔看看II
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Features
4 n& ~: _2 l, o/ i. `' q' I( e% hn Dual, 180° Phased Controllers Reduce Required
" h" @' |6 H& m6 ? n) vInput Capacitance and Power Supply Induced Noise9 f9 V1 e% m- D
n High Efficiency: Up to 95%
6 i" R9 ]" q, P2 { m# wn RSENSE or DCR Current Sensing
$ O% L0 O& Y `, N0 k, b# n# Y4 ]n Programmable DCR Temperature Compensation
7 X9 a. S, c% x. [! ]/ On ±0.75% 0.6V Output Voltage Accuracy
+ `5 F) E' X a' Hn Phase-Lockable Fixed Frequency 250kHz to 770kHz' v+ W0 Q9 `1 `: |& B7 | D
n True Remote Sensing Differential Amplifier* I8 T0 L$ R" D- ~% T
n Dual N-Channel MOSFET Synchronous Drive9 o: |8 i! c5 S
n Wide VIN Range: 4.5V to 38V1 e* f, N$ b# U) u8 |( u
n VOUT Range: 0.6V to 12.5V without Differential Amplifier
4 j$ h# Y/ A0 Q( C+ a, J( }6 ^n VOUT Range: 0.6V to 3.3V with Differential Amplifier
1 X) B7 y4 q0 Z0 T% Hn Clock Input and Output for Up to 12-Phase Operation0 l% \2 F2 M- B6 _9 o' s( H0 {2 M3 ~
n Adjustable Soft-Start or VOUT Tracking7 |' j3 o w, t
n Foldback Output Current Limiting
4 p1 l# b5 D6 H1 ^3 X4 B6 in Output Overvoltage Protection; F. \' G9 x; O$ f6 y0 i W* E) ]
n 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package3 J& y+ _3 G- n5 m" D4 I
Descriptio
8 p( h1 g- ~- Q+ V7 ]The ZC3855 is a dual PolyPhase® current mode synchro
s H' y& m" G5 c, H; lnous step-down switching regulator controller that drives; D. u$ z6 s: L5 k
all N-channel power MOSFET stages. It includes a high
3 J. `& [6 ?- z! N# ?: sspeed differential remote sense amplifier. The maximum2 C# N; a0 U3 P, T5 v; S3 A
current sense voltage is programmable for either 30mV,. E4 Q: v0 d% q! f2 p3 d0 V& H
50mV or 75mV, allowing the use of either the inductor DCR
; l6 G4 R: p: O. v" T( for a discrete sense resistor as the sensing element.! g2 k) J5 @9 A/ T# ?6 C, E
The ZC3855 features a precision 0.6V reference and can
+ `) U* I# ?" ?produce output voltages up to 12.5V. A wide 4.5V to 38V
7 Y, u5 h! @" Zinput supply range encompasses most intermediate bus1 p) o0 r) \/ Z8 _3 f
voltages and battery chemistries. Power loss and supply t5 g+ C" A3 k" k
noise are minimized by operating the two controller output
) x8 a+ U' ~. S: v# M" g# k- K" cstages out of phase. Burst Mode® operation, continuous9 T3 t& Q* g% I! \
or pulse-skipping modes are supported./ p/ _- B- a6 c4 ]4 J6 S
The ZC3855 can be configured for up to 12-phase op
3 c e* L) y& d* A. }: A3 m) q* Peration, has DCR temperature compensation, two power
/ K) ?2 M5 b% Hgood signals and two current limit set pins. The ZC3855' f" T( f' @+ t9 K* ^
is available in low profile 40-pin 6mm × 6mm QFN and' V w6 u0 p( y) Q- h
38-lead exposed pad FE packages.
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