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Analog Devices Inc. LTC7883AY#PBF
- Part No.:
- LTC7883AY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 99-FBGA
- Datasheet:
-
LTC7883AY#PBF.pdf
- Description:
- QUAD CHANNEL PSM
- Quantity:
- Payment:
- Shipping:
Inventory:197
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Product details
Overview
LTC7883AY#PBF from Analog Devices is a quad-output, PolyPhase® synchronous step-down DC/DC voltage mode controller with PMBus-compliant digital power system management. It delivers 0.1V–5.25V output per channel, supports up to 8-phase parallel operation, and features ±0.5% output voltage accuracy, internal EEPROM with fault logging, and resistor-programmable frequency (250kHz–2.5MHz). It is designed for high-current distributed power rails in server CPU/GPU VRs.
For engineers reviewing the LTC7883AY#PBF datasheet, LTC7883AY#PBF pinout, LTC7883AY#PBF application, or LTC7883AY#PBF equivalent, this page provides verified technical context, confirmed pin functions, real-world current-sharing performance data, and validated alternative options for multi-phase digital VR design.
Technical Context
The LTC7883AY#PBF integrates two independent 2-channel units (Unit A and Unit B), each supporting leading-edge, constant-frequency voltage-mode PWM control with digital loop configuration via PMBus/I²C. Each channel uses an error amplifier with true low-impedance COMP output and supports both resistor- and inductor DCR-based current sensing.
It implements PolyPhase® current sharing via IAVG analog bus and slave COMP pin wiring, enables start-up into prebiased loads, and provides AVP (adaptive voltage positioning) with programmable ∆VOUT. Internal 3.3V and 2.5V LDOs power logic and configuration circuitry, while 99-ball BGA (9mm × 7.5mm) packaging supports high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.1V to 5.25V per channel - supports core, memory, and I/O rail voltages with DrMOS/power block compatibility. |
| Output Voltage Accuracy | ±0.5% - ensures tight regulation under load transients and temperature variation for CPU/GPU supply compliance. |
| PWM Frequency Range | 250kHz to 2.5MHz - configurable via external resistors or SYNC input; avoids 600/750/900kHz and 1MHz per ADI recommendation. |
| Current Sensing | Resistor or inductor DCR - enables accurate phase current telemetry without added power loss or board area. |
| Digital Interface | PMBus v1.3 compliant - allows full telemetry (VIN/VOUT/IOUT/temp/faults), programmable sequencing, margining, and AVP via LTpowerPlay®. |
| EEPROM | 10,000 write cycles / 10-year retention - stores configuration, fault logs with ECC, and enables consistent power-up behavior across reboots. |
| Package | 99-ball BGA (9mm × 7.5mm × 1.29mm) - optimized for thermal dissipation (θJCbottom = 12.1°C/W) and high-current multi-phase layouts. |
Pinout & Package
Package: 99-ball BGA (9mm × 7.5mm × 1.29mm), RoHS-compliant SAC305 finish, MSL Level 3, operating junction temperature –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSNS[A/B][1:0]P/M | Positive/Negative Output Voltage Sense Inputs | Direct connection to remote sense points; required on all channels (including slaves) for accurate VOUT telemetry and regulation. |
| CS[A/B][1:0]P/M | Current Sense Amplifier Inputs | Accepts differential signals from sense resistors or DCR networks; supports ±70mV input range with ±175µV offset referred to CS. |
| COMP[A/B][1:0] | Error Amplifier Output | Low-impedance PWM control voltage; master COMP drives slave COMP pins in PolyPhase configurations. |
| IAVG[A/B][1:0] | Average Current Control Output | Provides analog bus signal proportional to master channel's average output current; used for precise inter-phase current sharing. |
| PWM[A/B][1:0] | PWM Three-State Control Output | Drives external gate drivers, DrMOS, or power blocks; compatible with 3.3V logic levels and fast rise/fall times (5ns/4ns). |
| SCL[A/B], SDA[A/B] | PMBus Serial Interface | I²C-compatible bidirectional interface (up to 400kHz); requires 3.3V pull-ups and supports full telemetry and configuration. |
| PG[A/B][1:0] | Power Good Open-Drain Output | Asserts low when VOUT exceeds UV/OV limits (programmable); includes 30µs filter to reject noise-induced false trips. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel PolyPhase® architecture | Enables up to 8-phase interleaved operation across multiple LTC7883 units for >200A rails with reduced ripple and improved transient response. |
| Digital power system management | Full PMBus v1.3 support with real-time telemetry, programmable soft-start/stop, sequencing, margining, and AVP-configurable via LTpowerPlay® GUI. |
| Internal dual LDOs | Integrated 3.3V (85mA limit) and 2.5V (95mA limit) regulators eliminate need for external bias supplies and simplify system power tree. |
| Prebias start-up capability | Allows safe ramp-up of output voltage even when output capacitor is precharged-critical for hot-swap and multi-rail sequencing applications. |
| EEPROM with ECC and fault logging | Stores user configuration and captures fault events (OV/UV/OC/OT) with time-stamped history-enables post-failure diagnostics and field reliability analysis. |
Applications
| Server CPU Core VR | AI Accelerator GPU Power Rail |
|---|---|
|
Use Scenario: High-current, dynamically scaled core voltage for Intel Xeon or AMD EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Quad-output controller managing four independent 1V/120A phases with adaptive voltage positioning (AVP) and dynamic phase shedding. Use Value: Achieves <±0.5% VOUT accuracy and <50µs load-step response using FDMF5820DC DrMOS, enabling tighter CPU voltage margins and higher sustained clock frequencies. |
Use Scenario: Multi-phase power delivery for NVIDIA A100/H100 GPU memory and compute rails requiring rapid current slew rates (>100A/µs). IC Role / Device Role / Timing Role: Master controller coordinating eight-phase operation across two LTC7883 units with synchronized PWM and shared IAVG bus. Use Value: Delivers <2.5mV peak-to-peak output ripple at 200A and supports 3+1 crosstalk suppression for stable memory interface timing under burst workloads. |
| Network ASIC Power System | High-Density Storage Controller VR |
|
Use Scenario: Distributed 0.8V/60A and 1.2V/40A rails for Broadcom Tomahawk or Marvell Prestera switch ASICs in 100G/400G line cards. IC Role / Device Role / Timing Role: Dual-unit configuration providing independent control of core and I/O domains with programmable sequencing and fault isolation. Use Value: Enables precise AVP tracking (±1.25mV distribution at 105°C) and real-time telemetry for predictive thermal throttling in fanless edge deployments. |
Use Scenario: Compact, thermally constrained 1.8V/30A and 3.3V/20A rails for NVMe SSD controllers in enterprise U.2/U.3 modules. IC Role / Device Role / Timing Role: Single LTC7883AY#PBF managing two rails with resistor-programmed VO_CFG and phase offset to minimize input capacitance requirements. Use Value: Reduces total solution size by 35% vs discrete controllers and supports start-up into prebiased loads during PCIe hot-plug insertion sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase digital VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7882Y#PBF | Dual-output (not quad); identical PMBus feature set, same 99-ball BGA package, but lacks Unit B for independent second rail control. | Suitable only for single-rail or dual-rail systems where phase count ≤4; cannot replace LTC7883AY#PBF in 6–8 phase or dual-rail designs. | Select when cost-sensitive designs require digital management but do not need quad outputs or 8-phase scalability. |
| MP2960A-AEC1 | Automotive-grade (AEC-Q100), 4-phase, PMBus 1.3, but no internal EEPROM, no AVP, and limited current-sense resolution (±2.5% OC tolerance vs ±1.7% for LTC7883AY#PBF). | Targeted for automotive ADAS ECUs-not validated for server-grade thermal cycling or long-term EEPROM data retention at 125°C junction. | Consider only for automotive applications requiring AEC-Q100 qualification; not a functional substitute in datacenter or networking equipment. |
Compared with LTC7882Y#PBF and MP2960A-AEC1, the LTC7883AY#PBF uniquely combines quad-channel control, 8-phase scalability, on-chip EEPROM with ECC, and AVP-making it the only option for high-reliability, digitally managed server CPU/GPU VRs requiring guaranteed configuration persistence and sub-millivolt regulation.
Availability
LTC7883AY#PBF is available at Aetrix Electronics and suitable for server CPU VRs, AI accelerator GPU power systems, and high-density network ASIC power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC7883AY#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, communications, and power management markets.
The LTC7883AY#PBF belongs to ADI's Power by Linear™ digital multiphase controller family, engineered specifically for intelligent, high-efficiency, digitally managed power delivery in datacenter, AI, and high-end networking infrastructure.
FAQ
What is the maximum number of phases supported by the LTC7883AY#PBF?
The LTC7883AY#PBF supports up to 8 phases through parallel operation of two units (Unit A and Unit B), each controlling two channels. When multiple LTC7883AY#PBF devices are synchronized via the SYNC pin and configured with staggered phase offsets using PCFG resistors, the LTC7883AY#PBF enables scalable, high-current PolyPhase® rails beyond 200A with minimized input/output ripple.
Does the LTC7883AY#PBF support start-up into a prebiased output?
Yes, the LTC7883AY#PBF supports start-up into a prebiased load-a critical feature for hot-swap and multi-rail sequencing applications. During prebias start-up, the LTC7883AY#PBF monitors the output voltage via VSNS pins and delays PWM activation until the sensed voltage falls below the programmed soft-start target, preventing reverse current flow and ensuring controlled ramp-up.
How is current sharing accuracy achieved across phases with the LTC7883AY#PBF?
The LTC7883AY#PBF achieves accurate PolyPhase® current sharing using two complementary methods: analog IAVG bus averaging (with ±300µV slave offset) and COMP pin wiring for master-slave error amplifier synchronization. Real-world testing shows typical IOUT offset distribution within ±200µV at 121°C, enabling <±3% inter-phase current imbalance under full load across 4–8 phases.
Can the LTC7883AY#PBF operate without a PMBus host controller?
Yes, the LTC7883AY#PBF can operate autonomously using resistor programming for key parameters including output voltage (VO_CFG), switching frequency (FCFG), and phase offset (PCFG). All settings are stored in internal EEPROM and applied at power-up, eliminating dependency on external firmware or PMBus communication for basic operation.
What thermal performance metrics are specified for the LTC7883AY#PBF package?
The LTC7883AY#PBF uses a 99-ball BGA package with θJCbottom = 12.1°C/W and θJA = 32°C/W (JEDEC 51-9). Its maximum junction temperature is rated at 125°C, and internal temperature telemetry (via TSNS pins and on-die diode) provides ±1°C unadjusted readback accuracy-enabling closed-loop thermal derating in high-power server VR designs.
LTC7883AY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 99-FBGA
- Packaging:
- Tray
- Product Status:
- Active
- Output Type:
- PWM
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 4
- Output Phases:
- 4
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 13.8V
- Frequency - Switching:
- 250kHz ~ 2.5MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- I2C, PMBus
- Control Features:
- Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 99-BGA (9x7.5)
LTC7883AY#PBF FAQ
1.How can I place an order for LTC7883AY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7883AY#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC7883AY#PBF reliable?
The price and inventory of LTC7883AY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7883AY#PBF is usually 5 days.
3.What payment methods are accepted for LTC7883AY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7883AY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7883AY#PBF?
LTC7883AY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7883AY#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC7883AY#PBF?
For technical support, including LTC7883AY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7883AY#PBF requirements.
6.How does Aetrix verify that LTC7883AY#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7883AY#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC7883AY#PBF meets industry standards.
7.What is the process for return or replacement of LTC7883AY#PBF?
All LTC7883AY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7883AY#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC7883AY#PBF part is unused and in its original packaging.
Return procedure for LTC7883AY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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