ZC3855双通道多相降压型电压稳压器替代LTC3855

四维电子

Features
n Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
n High Efficiency: Up to 95%
% S5 K' |8 j: B/ o% z5 Wn RSENSE or DCR Current Sensing
: p5 }8 x' b; J# x+ wn Programmable DCR Temperature Compensation
1 `( a% a1 G+ a8 P3 un ±0.75% 0.6V Output Voltage Accuracy
n Phase-Lockable Fixed Frequency 250kHz to 770kHz
: S3 z- z. r, X/ K6 u% p4 T& D- tn True Remote Sensing Differential Amplifier
* C, u' l) G- q5 U1 Y" in Dual N-Channel MOSFET Synchronous Drive
* n7 L; v# O7 c+ n9 I& Rn Wide VIN Range: 4.5V to 38V
* Y6 }1 {; T% y: ?% Vn VOUT Range: 0.6V to 12.5V without Differential Amplifier
n VOUT Range: 0.6V to 3.3V with Differential Amplifier
. N; O) S' R6 a9 I. D- K1 wn Clock Input and Output for Up to 12-Phase Operation
* F9 g: B% v4 e' |/ \: Xn Adjustable Soft-Start or VOUT Tracking
* }7 f) N& z2 [1 c6 in Foldback Output Current Limiting
. ^- l( j( ^7 ]+ H0 l9 en Output Overvoltage Protection
4 l9 a6 q0 k& r: k6 [4 l3 M( U. _n 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package
Descriptio
The ZC3855 is a dual PolyPhase® current mode synchro
% U/ T8 L6 u. N6 A- xnous step-down switching regulator controller that drives
, V# j# A. t4 g0 z3 U1 jall N-channel power MOSFET stages. It includes a high
speed differential remote sense amplifier. The maximum
current sense voltage is programmable for either 30mV,
7 V; {; M! L/ }. M; J! {50mV or 75mV, allowing the use of either the inductor DCR
  Z5 v$ N2 P/ O: H# T" Zor a discrete sense resistor as the sensing element.
9 c, z& J& z# E, o, f+ @The ZC3855 features a precision 0.6V reference and can
5 ^+ F9 X/ H9 @/ J, \produce output voltages up to 12.5V. A wide 4.5V to 38V
7 ]* G; N" T3 D" X& E/ c1 Q, Winput supply range encompasses most intermediate bus
voltages and Battery chemistries. Power loss and supply
2 Z6 J9 G4 u! [) u& G: [noise are minimized by operating the two controller output
stages out of phase. Burst Mode® operation, continuous
% m) F5 \) e* m0 Yor pulse-skipping modes are supported.
: w9 D' T8 c3 f0 p$ v* g* RThe ZC3855 can be configured for up to 12-phase op
' b1 [: _3 p0 R7 I# L$ Z& T, ]eration, has DCR temperature compensation, two power
good signals and two current limit set pins. The ZC3855
2 D* w: o: [: w) A1 u  g1 fis available in low profile 40-pin 6mm × 6mm QFN and
38-lead exposed pad FE packages.