FEATURES
n Silent Switcher ®2 Architecture for Low EMI
n VI N Range: 3.1V to 20VOUT Range: 0.5V to 5.5V
n Differential VOUT Remote Sense
n Adjustable Frequency: 400kHz to 3MHz
n PolyPhase® Operation: Up to 12 Phases
n Output Tracking and Soft-Start
n Reference Accuracy: ±1% Overtemperature
n Current Mode Operation for Excellent Line and Load Transient Response
n Accurate 1.2V Run Pin Threshold
n Supports Forced Continuous/Discontinuous Modes
n 28-Lead Thermally Enhanced 4mm × 5mm × 0.74mm LQFN Package
APPLICATIONS
n Automotive and Industrial Power Supplies
n Server Power Applications
n Distributed Power System
s n Point-of-Load Supply for ASIC, FPGA, DSP, µP, etc.
DESCRIPTION
The ZCC7151S is a high efficiency monolithic synchronous buck regulator capable of delivering 15A to the load. It uses a phase lockable contro lled on-time constant fre-quency, current mode architecture. PolyPhase operation allows multiple ZCC7151S regulators to run out-of-phase, which reduces the amount of input and output capacitors required. The operating supply voltage range is from 3.1V to 20V. The operating frequency is programmable from 400kHz to 3MHz with an external resistor. Th e high frequency capability allows the us e of physically smaller inductor and capacito r sizes. For switching noise sensitive applications, the ZCC7151S can be externally synch ronized from 400kHz to 3MHz. The PHMODE pin allows the user control of the phase of the outgo ing clock signal. The unique con-stant frequen cy/controlled on-time architecture is ideal f or high step-down ratio applications that op erate at high frequencies while demanding f ast transient response. The ZCC7151S uses secon d generation Silent Switcher 2 tech-nology in cluding integrated bypass capacitors to deliv er a highly efficient solution at high freque ncies with excellent EMI performance.
