DESCRIPTION

The LT®7200S is a quad-channel, high efficiency

monolithic synchronous buck regulator, capable of

sinking/sourcing 5A to the load per channel. Its multichannel

flexibility is ideal for powering complex

systems with the compact layout. The operating

supply voltage range is from 2.9V to 18V, making it

suitable for various supply applications from a 3.3V,

5V to 12V supply.

The operating frequency is programmable from

400kHz to 3MHz with an external resistor, or externally

synchronized for switching noise sensitive

applications. The unique “phase lockable, controlled

on-time, constant frequency, current mode”

architecture, is ideal for high frequency, high stepdown

applications while demanding fast transient

responses. The high frequency capability allows

smaller surface mount inductors and capacitors. The

MODE/SYNC pin selects low noise Forced Continuous

Mode (FCM) or high efficiency Discontinuous Mode

(DCM). The PHMODE pin allows to run out-of-phase

among 4 channels, which lessens the required input

and output capacitors. The LT7200S uses second

generation Silent Switcher technology with

integrated bypass capacitors to deliver a highly

efficient solution at high frequencies with excellent

EMI performance.

FEATURES

 Silent Switcher 2 Architecture:

 Ultralow EMI

 Eliminated PCB Layout Sensitivity

 Internal Bypass Caps Reduce Radiated EMI

 Wide SVIN Range: 2.9V to 18V; PVIN: 1.5V to 18V

 Wide VOUT Range: 0.5V to 0.9VIN

 Output Current: ±5A/ Channel; up to ±20A

 Accurate Reference: 0.5V ± 0.8 Over Temp

 High Efficiency: Up to 96

 12ns Min on-time: True 12V to 1V at 2MHz

 Programmable Multi-phase, Synchronizable

Frequency: 400kHz to 3MHz

 Current Mode: Excellent Line and Load

Transient Response

 User Selectable Discontinuous Mode® (DCM) or

Forced Continuous Mode (FCM) Operation

 Flexible Individual Internal Compensation for

Ease of Use; External for Fast Transient

 Accurate Individual 1.2V EN/ Run Pin Threshold

 Individual Output Tracking and Soft-Start

 Individual Power Good Status Output

 Low Profile 5mm x 6mm 48-Lead LQFN Package

APPLICATIONS

 Distributed Power Systems, Server Power

 Point of Load Supply for ASIC, FPGA, Etc.