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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
! C2 E# X( g' _ A7 Y8 on Dual, 180° Phased Controllers Reduce Required# c4 f d9 a; R2 e
Input Capacitance and Power Supply Induced Noise
@& `8 O$ e3 N5 u& r2 `! Zn High Efficiency: Up to 95%3 |# Y/ _, u0 x o( z( J+ h8 o1 _
n RSENSE or DCR Current Sensing$ k9 ?' v- m/ U7 s4 o, K# P
n Programmable DCR Temperature Compensation
N6 ^5 \8 U% d) Bn ±0.75% 0.6V Output Voltage Accuracy
$ t* p, x; V9 R$ ^) X- ~0 |n Phase-Lockable Fixed Frequency 250kHz to 770kHz* D! n1 n$ h" z7 r' Z- [4 \3 K! R: V x
n True Remote Sensing Differential Amplifier) Y1 b# R# I* D- h, u' }
n Dual N-Channel MOSFET Synchronous Drive- ^7 V6 W6 s1 N: s" f9 t# d
n Wide VIN Range: 4.5V to 38V0 j" `9 W' l4 Y
n VOUT Range: 0.6V to 12.5V without Differential Amplifier
) F8 P; ?9 i( Yn VOUT Range: 0.6V to 3.3V with Differential Amplifier
9 b& G8 f8 k. v7 B; x/ Mn Clock Input and Output for Up to 12-Phase Operation$ V g* `4 v b2 l6 g, i- b
n Adjustable Soft-Start or VOUT Tracking
# M" Q& I" l% ]$ r5 K5 X' _+ s- Nn Foldback Output Current Limiting/ W9 f( d9 @2 Q* N
n Output Overvoltage Protection
- Y3 N" L: e4 k0 w4 O9 m6 y9 dn 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package7 f8 S# _7 o0 _1 j/ R
Descriptio
+ ?( D6 o0 E% {The ZC3855 is a dual PolyPhase® current mode synchro2 ]# g* h( O" u) p
nous step-down switching regulator controller that drives: i7 _7 M/ v8 A7 r
all N-channel power MOSFET stages. It includes a high5 G/ X9 X% B q" q! e4 {
speed differential remote sense amplifier. The maximum
% u# @$ w4 E# k- B( B/ Vcurrent sense voltage is programmable for either 30mV,) b; |# Y) m! V! d& N
50mV or 75mV, allowing the use of either the inductor DCR
+ L0 b, G; g; x! f) G4 z" Bor a discrete sense resistor as the sensing element.
6 |) ? V6 l1 c( G8 bThe ZC3855 features a precision 0.6V reference and can" K, S' [! d) b; f6 G9 l
produce output voltages up to 12.5V. A wide 4.5V to 38V6 J! Q7 {% @% f# B9 |& h8 M
input supply range encompasses most intermediate bus
7 {1 ]% m* a5 H% kvoltages and battery chemistries. Power loss and supply
t& \4 w: D- Q, p; knoise are minimized by operating the two controller output
/ I5 B" E f' F" vstages out of phase. Burst Mode® operation, continuous
% W2 X1 G4 s6 Uor pulse-skipping modes are supported. c" _9 }0 l+ I& R: v
The ZC3855 can be configured for up to 12-phase op
$ u# N" \0 f8 l6 c" v A" M$ s8 ueration, has DCR temperature compensation, two power6 P+ `/ q( c- H+ m) G
good signals and two current limit set pins. The ZC3855
% C& N, t0 o8 R, }, |# v" \! dis available in low profile 40-pin 6mm × 6mm QFN and
. {. b; t- `! r- V: W38-lead exposed pad FE packages.$ O X' R8 E0 E4 [2 [. Q
" u' k& R$ F. a# C
* N% R, A3 N% Y% z: E) n
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