LTC3882-2 - Dual PMBus Buck Controller | Analog Devices
MPN: LTC3882-2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.95 | $169.50 |
| 100 | $14.6 | $1,460.00 |
| 500 | $12.8 | $6,400.00 |
| 1,000 | $11.25 | $11,250.00 |
LTC3882-2 Overview
A DC/DC switching regulator controller is an integrated circuit that manages the power stage of a switching converter, generating the PWM signals that drive external MOSFETs to step down a higher input voltage to a regulated lower output voltage. Unlike a linear regulator, it achieves high efficiency by switching power devices on and off, making it essential for power-hungry applications such as servers, telecom, and industrial systems. The LTC3882-2 belongs to the family of digital power management controllers, which combine analog regulation with digital configuration and telemetry via PMBus.
Key features include a wide input voltage range of 4.5V to 24V, dual outputs with programmable output voltages from 0.5V to 5.5V, and a PMBus interface for configuration and monitoring. The device integrates high-side and low-side gate drivers, supports external MOSFETs for high-current applications, and provides accurate current sensing and temperature monitoring. It also features programmable switching frequency, soft-start, and fault protection, making it a versatile solution for complex power systems.
Technically, the LTC3882-2 employs a voltage mode control architecture with leading-edge modulation, which provides excellent noise immunity and fast transient response. The PMBus interface allows real-time readback of input voltage, output voltage, output current, temperature, and fault status, enabling sophisticated power management and telemetry. The device is available in a 40-pin QFN package (6mm x 6mm) and operates over a junction temperature range of -40°C to +125°C.
Typical applications include high-current FPGA and ASIC power supplies, server and datacenter power distribution, telecom and networking equipment, and industrial power systems. The LTC3882-2 is ideal for designs requiring precise voltage regulation, high efficiency, and digital control and monitoring capabilities.
When designing with the LTC3882-2, ensure proper PCB layout for the high-current paths and adequate thermal management for the external MOSFETs. The PMBus interface simplifies configuration and monitoring, but careful attention to the I2C address and bus timing is required for reliable communication.
Drop-in alternatives for LTC3882-2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC3882-2 (same form factor and footprint) — differing in Package, Output Voltage Range, Serial Interface, Control Architecture, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3882-1#PBF
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →LTC3882#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS40422RHLR
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS40428RHLR
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3882-2 Maximum Ratings & Electrical Characteristics
| Product Type | Dual Output PolyPhase Step-Down DC/DC Controller |
| Manufacturer | Analog Devices |
| Input Voltage Range | 4.5V to 24V |
| Output Voltage Range | 0.5V to 5.5V (programmable) |
| Number of Outputs | 2 |
| Control Architecture | Voltage Mode, Leading-Edge Modulation |
| Serial Interface | PMBus-compliant |
| PolyPhase Operation | Up to 4 devices in parallel: 2, 3, 4, 6, or 8 phases |
| Gate Drivers | Integrated high-side and low-side gate drivers |
| External MOSFET/DrMOS Support | Yes (e.g., FDMF5820DC, FDMF6820A) |
| Current Sensing | Yes (accurate) |
| Temperature Monitoring | Yes |
| Fault Protection | Yes (programmable fault thresholds) |
| Soft-Start | Yes (programmable) |
| Operating Junction Temperature | -40°C to +125°C |
| Package | 40-pin QFN (6mm x 6mm) |
| Mounting Type | Surface Mount |
| RoHS Status | unknown |
| AEC-Q100 | not_applicable |
LTC3882-2 40-pin qfn (6mm x 6mm) Pin Configuration Guide
Pin configuration for LTC3882-2 (40-pin qfn (6mm x 6mm) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LTC3882-2.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC3882-2 is suitable for 6 applications: Server & Datacenter Power Distribution, FPGA/ASIC Core Power Supplies, Telecom & Networking Equipment, Industrial Power Systems, High-Current Point-of-Load (POL) with DrMOS, Digital Power Management and Telemetry Systems.
Server & Datacenter Power Distribution
The LTC3882-2 is well suited for server and datacenter power distribution because its 4.5V to 24V input range covers standard 12V intermediate bus rails, while the dual 0.5V to 5.5V outputs address CPU, memory, and logic rails. Up to four controllers can be paralleled for 2-, 3-, 4-, 6-, or 8-phase operation, enabling the high-output-current, low-voltage rails required by modern processors. The PMBus interface provides real-time telemetry of input/output voltage, current, and temperature, which simplifies power management in hyperscale environments and enables dynamic adjustments through LTpowerPlay.
Recommended
FPGA/ASIC Core Power Supplies
FPGAs and ASICs require multiple low-voltage, high-current rails with tight transient response. The LTC3882-2's voltage-mode control with leading-edge modulation provides excellent transient performance, while the dual outputs can be configured independently via PMBus to deliver core and I/O voltages such as 0.85V and 1.8V. The programmable soft-start and sequencing features help manage inrush current and power-up order. Because the controller drives external MOSFETs or DrMOS stages, it can scale from 20A to over 200A by adding phases, making it a flexible building block for FPGA and ASIC power systems.
Recommended
Telecom & Networking Equipment
Telecom and networking systems demand high efficiency, precise regulation, and remote management capability. The LTC3882-2 supports a 4.5V to 24V input range that includes common telecom intermediate bus voltages (5V, 12V). Its PMBus interface enables remote voltage/current monitoring and fault readback, which is critical for managing power in base stations, routers, and switches. The device's leading-edge modulation architecture minimizes noise on sensitive network interfaces, and phase expansion supports 2- to 8-phase configurations for high-availability payload cards.
Recommended
Industrial Power Systems
Industrial power systems often require rugged, configurable power management with precise current sharing and fault protection. With a -40C to +125C junction temperature range, the LTC3882-2 suits industrial operating environments. The controller's constant-frequency voltage-mode architecture provides predictable switching behavior for EMI-sensitive designs, and the PMBus interface supports programming of fault thresholds, soft-start, and frequency. Multi-phase paralleling enables high-current supplies for industrial processors, motor controllers, and programmable logic controllers (PLCs) without redesigning the control loop.
Recommended
High-Current Point-of-Load (POL) with DrMOS
The LTC3882-2 is ideal for high-current POL converters using external DrMOS power stages. An ADI EngineerZone recommendation lists FDMF5820DC and FDMF6820A for a 12V input, 0.85V output, 26A application. This approach moves the high-speed driver and MOSFETs into a thermally optimized module, while the LTC3882-2 handles PWM control, voltage-mode regulation, and PMBus telemetry. Multiple phases can be paralleled to achieve currents beyond a single DrMOS rating, with phase interleaving reducing output ripple and improving transient response.
Recommended
Digital Power Management and Telemetry Systems
As systems adopt digital power management, the LTC3882-2 provides a PMBus-compliant platform for real-time monitoring and control. It can read back input voltage, output voltage, output current, temperature, and fault status, enabling predictive maintenance and adaptive voltage scaling. LTpowerPlay software allows engineers to configure all parameters through a graphical interface and store configuration in the controller. This makes the LTC3882-2 an excellent choice for research labs, test equipment, and any power system requiring detailed telemetry and automation.
Recommended
Recommended Products Summary
Engineering reference data for LTC3882-2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3882-1#PBF | LTC3882#PBF | TPS40422RHLR | TPS40428RHLR |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 40-pin QFN (6x6mm) | 40-pin QFN (6x6mm) | 40-pin QFN (6x6mm) | 40-pin VQFN | 40-pin VQFN |
Key Differentiators
- Pin-compatible drop-in across LTC3882 family (vs LTC3882-1#PBF)
- Multi-device PolyPhase expansion to 8 phases (vs LTC3882#PBF)
- Integrated telemetry and LTpowerPlay support (vs TPS40422RHLR)
Design Notes
For the 40-pin 6x6mm QFN package, place the exposed thermal pad on a large ground plane with multiple vias to minimize thermal resistance. Keep high-current MOSFET/DrMOS gate-drive traces short and wide. Place input decoupling capacitors close to the VIN and GND pins. Follow the ADI datasheet layout recommendations for the LTC3882 to minimize parasitic inductance and ensure stable voltage-mode loop operation.
The LTC3882-2 is a controller, so most power dissipation occurs in external MOSFETs or DrMOS stages. For a 12V to 0.85V, 26A channel using FDMF5820DC/FDMF6820A, ensure each DrMOS has adequate copper area and airflow. The controller itself dissipates only a few hundred milliwatts, but its die temperature can rise from nearby power stages; maintain the junction temperature below 125C by using thermal vias under the QFN pad.
When using PMBus, set a unique I2C/PMBus address for each LTC3882-2 in a multi-controller system before parallel operation. Check bus pull-up resistor values for the I2C line, and use LTpowerPlay to verify communication. In addition, do not exceed the 24V maximum input voltage; input transients above 24V can damage the controller. Follow the sequencing requirements for multi-rail systems using the soft-start and fault settings.
Compliance Information
No compliance data was provided in the verified web data; RoHS/REACH status should be confirmed with the ADI datasheet or product page.
