Features
n Dual, 180° Phased Controllers Reduce Required
Input 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
n True Remote Sensing Differential Amplifier
n Dual N-Channel MOSFET Synchronous Drive
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
n Clock Input and Output for Up to 12-Phase Operation
n Adjustable Soft-Start or VOUT Tracking
n Foldback Output Current Limiting
n Output Overvoltage Protection
n 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package
Descriptio
The ZC3855 is a dual PolyPhase® current mode synchro
nous step-down switching regulator controller that drives
all N-channel power MOSFET stages. It includes a high
speed differential remote sense amplifier. The maximum
current 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.
The ZC3855 features a precision 0.6V reference and can
produce output voltages up to 12.5V. A wide 4.5V to 38V
input supply range encompasses most intermediate bus
voltages and battery chemistries. Power loss and supply
noise 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
good signals and two current limit set pins. The ZC3855
is available in low profile 40-pin 6mm × 6mm QFN and
38-lead exposed pad FE packages.
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