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

The LTC3882-1/LTC3882-2 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 0.1V to 5.25V using a wide range of 3.3V compatible power stages, including power blocks, DrMOS or discrete FET drivers. Up to four LTC3882-1 devices can operate in parallel for 2-, 3-, 4-, 6- or 8-phase operation.

System configuration and monitoring is supported by the LTpowerPlay™ software tool. The LTC3882-1/LTC3882-2 serial interface can read back input voltage, output voltage and current, temperature and fault status. Most 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 set using external configuration resistors.

PWM Enable Output

TG/BG Control

HW Write Protect

Dedicated PGOOD

Differential VOUT Sense

Max PWM Frequency

LTC3882

Yes

Yes

Yes

No

VOUT0 Only

1.25MHz

LTC3882-1

No

No

No

Yes

VOUT0 & VOUT1

1.25MHz

LTC3882-2

No

No

No

Yes

VOUT0 & VOUT1

2.5MHz

Note: Analog Devices, Inc., does not recommend using the following PWM frequencies in new designs: 600kHz, 750kHz, 900kHz, and 1MHz.

Applications

* High Current Distributed Power Systems

* Servers, Network and Storage Equipment

* Intelligent Energy Efficient Power Regulation

* PMBus/I2C Compliant Serial Interface

* Monitor Voltage, Current, Temperature and Faults

* Program Voltage, Soft-Start/Stop, Sequencing, Margining, AVP and UV/OV/OC Limits

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

* ±0.5% Output Voltage Error

* Programmable PWM Frequency or External Clock Synchronization from 250kHz to 1.25MHz (2.5MHz-2)

* Accurate PolyPhase® Current Sharing

* Internal EEPROM with Fault Logging and ECC