5V, ±25A High Efficiency Silent Switcher2 Step-Down Regulator

The LT®7153SP is a high efficiency monolithic synchronous, Silent Switcher®2 buck regulator capable of delivering ±25A to the load. The unique constant frequency, controlled on-time, current mode architecture is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. PolyPhase operation allows multiple LT7153SP regulators to run out-of-phase, which reduces the amount of input and output capacitors needed while enables paralleling for higher output currents. The operating supply voltage range is from 2.7V to 5V.

The operating frequency is programmable from 400kHz to 5MHz with an external resistor or sync to an external clock signal. The high frequency capability allows the use of physically smaller inductors and capacitors.

The LT7153SP package features the second-generation Silent Switcher architecture to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize high frequency current loops and makes it easy to achieve advertised EMI performance by reducing layout sensitivity. It also features an exposed back for heat sink attachment, which can be used to significantly improve thermal performance.

APPLICATIONS

* Optical Module Applications

* Distributed Power Systems, Server Power

* Point-of-Load Supply (i.e., ASIC, FPGA, DSP, μP)

* Silent Switcher®2 Architecture

* Ultralow EMI

* Eliminates PCB Layout Sensitivity

* Internal Bypass Caps Reduce Radiated EMI

* SVIN: 2.7V to 5V; PVIN: 1.5V to 5V

* VOUT: 0.5V to 0.9∙VIN

* Accurate Reference: 0.5V ±0.8% Over Temp

* Integrated N-MOSFETs: 1.8mΩ/0.7m&Omega

* 15ns Min On-Time: Low Duty Cycle Operation

* Differential VOUT Remote Sense

* Configurable Fixed Output Options

* Programmable Load Line (3 settings)

* Programmable Current Limit (3 settings)