Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

The LTC3882 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with PMBus compliant serial interface. It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. Each PWM channel can produce output voltages from 0.5V to 5.25V using a wide range of 3.3V compatible power stages, including power blocks, DrMOS or discrete FET drivers. Up to four LTC3882s can operate in parallel for 2-, 3-, 4-, 6- or 8-phase operation.

LTC3882 system configuration and monitoring is supported by the LTpowerPlay® software tool. The device’s serial interface can be used to read back input voltage, output voltage and current, temperature and fault status. A wide range of operating parameters can be set via the digital interface or stored in internal EEPROM for use at power up. Switching frequency and phase, output voltage and device address can also be programmed using external configuration resistors.

PWM Enable Output

TG/BG Control

HW Write Protect

Dedicated PGOOD

Differential VOUT Sense

LTC3882

Yes

Yes

Yes

No

VOUT0 Only

LTC3882-1

No

No

No

Yes

VOUT0 & VOUT1

Applications

* High Current Distributed Power Systems

* Servers, Network and Storage Equipment

* Intelligent Energy Efficient Power Regulation

* Industrial/Telecom/ATE Systems

* PMBus/I2C Compliant Serial Interface

* Monitor Voltage, Current, Temperature and Faults

* Digitally Programmable Voltage, Current Limit, Soft-Start/Stop, Sequencing, Margining, AVP and UV/OV Thresholds

* 3V ≤ VINSNS ≤ 38V, 0.5V ≤ VOUT ≤ 5.25V

* ±0.5% Output Voltage Accuracy

* Programmable PWM Frequency or External Clock Synchronization from 250kHz to 1.25MHz