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
$ Y8 F( q+ k$ ]/ wInput Capacitance and Power Supply Induced Noise
n High Efficiency: Up to 95%
n RSENSE or DCR Current Sensing
n Programmable DCR Temperature Compensation
n ±0.75% 0.6V Output Voltage Accuracy
n Phase-Lockable Fixed Frequency 250kHz to 770kHz
3 t6 t/ X6 r* an True Remote Sensing Differential Amplifier
n Dual N-Channel MOSFET Synchronous Drive
  A8 T4 u# D' E7 o  R& |n Wide VIN Range: 4.5V to 38V
n VOUT Range: 0.6V to 12.5V without Differential Amplifier
n VOUT Range: 0.6V to 3.3V with Differential Amplifier
7 ^5 j2 D  A( |0 N+ v' k1 zn Clock Input and Output for Up to 12-Phase Operation
- \# z0 N4 f& i% H$ An Adjustable Soft-Start or VOUT Tracking
9 `" O; q1 \( m9 P" Ln Foldback Output Current Limiting
! _! w) _4 p: F( ^" u3 R2 jn Output Overvoltage Protection
2 ?0 ^$ H# r0 ~8 y, D8 ~n 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package
9 H( k, `. }% q, H/ H. HDescriptio
The ZC3855 is a dual PolyPhase® current mode synchro
9 n! S5 t3 w$ S8 ?nous step-down switching regulator controller that drives
% L- _4 X% Q4 R5 s8 {2 gall N-channel power MOSFET stages. It includes a high
speed differential remote sense amplifier. The maximum
6 z5 |. h6 `, L+ s0 gcurrent sense voltage is programmable for either 30mV,
50mV or 75mV, allowing the use of either the inductor DCR
or a discrete sense resistor as the sensing element.
% ?6 G4 o7 X0 K4 f& H0 kThe ZC3855 features a precision 0.6V reference and can
# }+ x1 I2 v6 g$ v& v* vproduce output voltages up to 12.5V. A wide 4.5V to 38V
. Z5 r( c6 H/ W& g* w$ Jinput supply range encompasses most intermediate bus
) Z) ]5 r  h% W7 p( N2 B! ]voltages and battery chemistries. Power loss and supply
- ^/ _# F: s8 |2 {6 L1 Cnoise are minimized by operating the two controller output
stages out of phase. Burst Mode® operation, continuous
or pulse-skipping modes are supported.
The ZC3855 can be configured for up to 12-phase op
eration, has DCR temperature compensation, two power
- h1 m1 @! t8 Cgood signals and two current limit set pins. The ZC3855
7 [) T! D. h' R+ l: {is available in low profile 40-pin 6mm × 6mm QFN and
6 U/ R" ?! V4 a( ?1 @38-lead exposed pad FE packages.