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2022-8-5 15:55 |
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Features: `5 e/ v2 b; H U
n Dual, 180° Phased Controllers Reduce Required. [6 }; ^: N9 [" T; Q. Q
Input Capacitance and Power Supply Induced Noise5 f$ {9 ^/ F# E! R- ~0 O3 i0 f
n High Efficiency: Up to 95%
9 X: ^) m } V0 N% [6 h1 z! b8 Gn RSENSE or DCR Current Sensing
8 X+ }1 `# R0 U- An Programmable DCR Temperature Compensation
( z7 Q$ x, p, m: Q5 e5 O# f, }( W* in ±0.75% 0.6V Output Voltage Accuracy
j( X6 z7 h' G8 Q# @' o Q. `n Phase-Lockable Fixed Frequency 250kHz to 770kHz
' h; S/ X/ |3 d Q% F) A# w4 jn True Remote Sensing Differential Amplifier5 o Y4 w1 ^; \8 d5 n3 h' R* a
n Dual N-Channel MOSFET Synchronous Drive) s& S0 B& t/ |2 }7 z$ }1 T
n Wide VIN Range: 4.5V to 38V* O: ]/ j$ y# x( X1 ]/ _: k
n VOUT Range: 0.6V to 12.5V without Differential Amplifier9 Y: B) |, l8 Z3 j5 K- l( \1 O+ q
n VOUT Range: 0.6V to 3.3V with Differential Amplifier0 c' n( O8 w" F' r: J+ Z
n Clock Input and Output for Up to 12-Phase Operation
* X' f& t; s) q1 O' sn Adjustable Soft-Start or VOUT Tracking8 s- a; }5 c$ p: x0 r! {
n Foldback Output Current Limiting
$ K+ F0 V6 d5 N7 q3 Un Output Overvoltage Protection
# m2 B8 F: ~: Q$ C, R7 W1 S) Mn 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package3 U7 H. F# S! m& ^
Descriptio. ]$ i8 S( R; t+ N$ x& }5 O
The ZC3855 is a dual PolyPhase® current mode synchro
7 f5 Z$ v8 d0 T# d. pnous step-down switching regulator controller that drives( m( U% u# \) J/ T' R; l
all N-channel power MOSFET stages. It includes a high; @' L$ p3 c* q
speed differential remote sense amplifier. The maximum2 [% E& c% C- H! O, W+ v
current sense voltage is programmable for either 30mV,
6 F2 E4 E' K% q; ^. j0 c+ {% a50mV or 75mV, allowing the use of either the inductor DCR R9 n0 G! t. f- d
or a discrete sense resistor as the sensing element., ?8 E" C3 [$ p# Z
The ZC3855 features a precision 0.6V reference and can
5 r2 [$ w, t- R' C: pproduce output voltages up to 12.5V. A wide 4.5V to 38V. B( v2 @. n( J- c+ T- ^3 d7 t4 ]
input supply range encompasses most intermediate bus8 @$ w' z; _9 D3 u7 |* I
voltages and battery chemistries. Power loss and supply% U' x7 Z: C; K5 u8 g2 [
noise are minimized by operating the two controller output
# d8 D+ O. ^2 ]5 F- qstages out of phase. Burst Mode® operation, continuous% c$ _; V- ~2 b9 t o: @
or pulse-skipping modes are supported.
' `5 w( o: i1 m! F- ?The ZC3855 can be configured for up to 12-phase op
3 _' o! V( H) j5 I, z& ~6 Beration, has DCR temperature compensation, two power
1 W# T' s! v& T7 J# rgood signals and two current limit set pins. The ZC3855
1 N& a: o3 A& Fis available in low profile 40-pin 6mm × 6mm QFN and
8 L3 A/ y f5 i+ I! p3 [38-lead exposed pad FE packages.6 x! E5 Y6 u, U. v z: G9 n
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