Features and Benefits
- PMBus/I2C Compliant Serial Interface
- Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and Faults
- Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV/OC
- Sub-Milliohm DCR Current Sensing
- Digitally Adjustable Loop Compensation Parameters
- ±0.5% Output Voltage Accuracy Over Temperature
- Integrated Input Current Sense Amplifier
- Internal EEPROM with ECC and Fault Logging
- Integrated N-Channel MOSFET Gate Drivers
The LTC7132 is a dual output PolyPhase DC/DC synchronous step-down monolithic regulator with an I2C-based PMBus compliant serial interface. The regulator employs a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance in sub-milliohm DCR applications. The LTC7132 is supported by the LTpowerPlay® software development tool with graphical user interface (GUI).
Programmable loop compensation allows the regulator to be compensated digitally. The switching frequency, channel phasing and device address can be programmed both by the digital interface as well as the external configuration resistors. Additionally, parameters can be set via the digital interface and stored in EEPROM. Both outputs have independent power good indicators and FAULT function.
The LTC7132 can be configured to operate in discontinuous (pulse-skipping) mode or forced continuous conduction mode. Each channel can deliver up to 25A of load current; the total current capability will depend on the APPLICATIONS total power dissipations on both channels.
- Wide VIN Range: 4.5V to 20V
- VOUT Range: 0.5V to 3.5V (with Ultralow DCR Setting);
- 0.5V to 5.5V (Typical DCR Setting)
- Accurate PolyPhase® Current Sharing for Up to 6 Phases
- Available in a 140-Lead (9mm × 11.25mm × 2.22mm)
- BGA Package
- Telecom, Datacom and Storage Systems
- Industrial and Point-of-Load Applications
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 2666A-A/2666A-B features the LTC7132, a wide input and output voltage range, high efficiency dual output polyphase DC/DC step-down regulator with sub-milliohm DCR sensing and digital power system management. This demo board is available in two versions: DC2666A-A is configured as 2-phase dual output, DC2666A-B is configured as 2-phase single output. Both versions operate over an input voltage range of 6V to 20V. The DC2666A-A factory default output voltage for both outputs are VOUT0 = 1V, VOUT1 = 1V with a 20A load current rating per channel. The DC2666A-B factory default output voltage is VOUT = 1V with a 40A load current rating. Both channels can deliver up to 25A maximum load current for each version.
The output voltages can be programmed from 0.6V up to 1.8V. Programming the output voltages to any value that is greater than 1.8V will require changes to the inductors, external DCR network component and may require the maximum output current to be derated based on thermal derating curves provided in the data sheet of LTC7132. The factory default switching frequency is preset at 425kHz typical. The DC2666A-A/DC2666A-B uses external inductors with extremely low DCR to demonstrate the part’s capability of provide excellent performance for submilliohm DCR current sense applications.
Both versions of DC2666A comes with PMBus interface and digital power system management functions. An onboard 12-pin connector is available for users to connect the DC1613A dongle to the demo board, which provides an easy way to communicate and program the part using LTpowerPlay® software development tool. LTpowerPlay software and I2C/PMBus/SMBus Dongle DC1613A allows users to monitor real time telemetry of input and output voltages, input and output current, switching frequency, internal IC die temperatures, external power component temperatures and fault logs. Programmable parameters include device address, output voltages, control loop compensation, switching frequency, phase interleaving, DCM or CCM Mode of operation, digital soft-start, sequencing and time based shut down, fault responses to input and output overvoltage, output overcurrent, IC die and power component overtemperatures.
The LTC7132 is available in a thermally enhanced, low profile 140-lead 9mm × 11.25mm × 2.22mm BGA package. It is recommended to read the data sheet and demo manual of LTC7132 prior to use or making any changes to DC2666A-A/DC2666A-B.
DC2666A-A: 6V ≤ VIN ≤ 20V; VOUT0/VOUT1 = 0.6V to 1.8V at 20A, 25A Peak
DC2666A-B: 6V ≤ VIN ≤ 20V; VOUT = 0.6V to 1.8V at 40A, 50A Peak
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
Reference Designs (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.