LTC7132IYPBF - Dual 25A PolyPhase Buck Regulator with PMBus | ADI
MPN: LTC7132IYPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.82 | $13.82 |
| 10 | $12.45 | $124.50 |
| 100 | $11.08 | $1,108.00 |
| 500 | $9.85 | $4,925.00 |
| 1,000 | $8.62 | $8,620.00 |
LTC7132IYPBF Overview
A step-down (buck) DC/DC switching regulator converts a higher DC input voltage to a lower regulated DC output voltage by rapidly switching an inductor and smoothing with output capacitance. The "PolyPhase" architecture interleaves multiple regulator phases to reduce input/output ripple and distribute thermal dissipation across phases. LTC7132IYPBF belongs to the hierarchy: synchronous buck regulator -> step-down switching regulator -> DC/DC converter -> power management IC -> semiconductor. The integrated PMBus interface places this part in the broader category of "digitally-managed POL" (point-of-load) converters used in telecom, datacom and computing infrastructure.
Key specifications include a wide 4.5V to 60V input voltage range (suitable for 12V, 24V, 48V telecom/datacom buses), 0.5V to 3.3V adjustable output range, 25A continuous output per channel, integrated N-channel MOSFETs, and parallel PolyPhase capability. The on-board EEPROM stores custom configuration for autonomous power-up without host intervention. Programmable parameters include VOUT, switching frequency, soft-start, current limit, and fault response. Differential output voltage sensing and active voltage positioning (AVP) optimize transient response and reduce output capacitance requirements.
Typical applications include 48V-to-POL conversion in telecom/datacom equipment, FPGA and ASIC core/serdes voltage rails, server and storage point-of-load regulation, industrial automation power, and high-current distributed power systems. The 140-FBGA package enables compact high-density layouts with excellent thermal performance via the die-attached thermal pad.
Designers should pay close attention to input bulk capacitor sizing for 60V transient survival, output inductor selection for ripple/current targets, and the exposed-pad PCB layout for thermal dissipation. The PMBus address strap resistors and SYNC pin configuration must follow the reference design to avoid multi-controller contention.
This page synthesizes distributor pricing, parametric comparisons and practical design notes not found in the manufacturer datasheet alone, including side-by-side drop-in alternatives in the same FBGA footprint and quantified thermal guidance for multi-phase operation.
Drop-in alternatives for LTC7132IYPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC7132MPYPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC7132EYPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC7132IY
✅ Drop-In✓ In Stock
$12.65 / Unit
View Datasheet →LTC7131IYPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC7132IYPBF-TR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC7132IYPBF Maximum Ratings & Electrical Characteristics
| Topology | Dual PolyPhase Synchronous Buck |
| Input Voltage Range | 4.5 V to 60 V |
| Output Voltage Range | 0.5 V to 3.3 V (adjustable) |
| Output Current per Channel | 25 A continuous (2 channels) |
| Total Output Current | 50 A (single-channel equivalent in parallel mode) |
| Number of Outputs | 2 |
| Integrated MOSFETs | Yes (high-side + low-side, internal) |
| Digital Interface | I2C / PMBus compliant with on-chip NVM |
| Operating Junction Temperature | -40 C to +125 C (I-grade) |
| Package | 140-ball FBGA (BGA-140) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (#PBF suffix) |
| Lead-Free Finish | Yes (Pb-free BGA balls, per #PBF suffix) |
LTC7132IYPBF Pin Configuration
| Pin A1 | VIN1 — Channel 1 input supply |
| Pin A2 | VIN1 — Channel 1 input supply |
| Pin B1 | BST1 — Channel 1 bootstrap |
| Pin B2 | SW1 — Channel 1 switching node |
| Pin C1 | GND — Ground |
| Pin C2 | GND — Ground |
| Pin D1 | VOUT1S+ — Channel 1 differential sense + |
| Pin D2 | VOUT1S- — Channel 1 differential sense - |
| Pin E1 | VOUT1 — Channel 1 output voltage |
| Pin E2 | VOUT1 — Channel 1 output voltage |
| Pin F1 | FB1 — Channel 1 feedback |
| Pin F2 | COMP1 — Channel 1 compensation |
| Pin G1 | RUN1 — Channel 1 enable |
| Pin G2 | PGOOD1 — Channel 1 power good |
| Pin H1 | SCL — PMBus/I2C clock |
| Pin H2 | SDA — PMBus/I2C data |
| Pin J1 | ALERTB — PMBus alert (active low) |
| Pin J2 | CTRL — Control input |
| Pin K1 | SYNC — Frequency synchronization |
| Pin K2 | PHSMD — Phase mode select |
Typical Applications
LTC7132IYPBF is suitable for 6 applications: 48V Telecom Point-of-Load Conversion, FPGA Core and Serdes Rail Generation, Server and Storage Point-of-Load Regulation, Industrial 24V PLC and Motor Control Rails, Test and Measurement Instrumentation Power, High-Current PoL for ASIC/AI Accelerators.
48V Telecom Point-of-Load Conversion
The LTC7132IYPBF's 4.5V-60V input range and dual 25A outputs are tailored for 48V telecom/datacom backplane systems that power FPGAs and ASICs at 1.0V-1.8V. Placed directly after the 48V bus input, the regulator eliminates intermediate 12V stages and reduces system BOM by 30-40%. ADI's reference design demonstrates 1.0V at 25A per channel with 92% peak efficiency, 2% transient deviation for 50% load steps, and PMBus telemetry for per-card monitoring. The wide VIN tolerance also meets ETSI EN 300 132-2 transient surge specs for telecom equipment without external protection devices.
Recommended
FPGA Core and Serdes Rail Generation
FPGAs typically need two tightly-regulated rails (e.g., 1.0V core and 1.8V serdes) with sub-2% transient deviation at 25-50A load steps. The LTC7132IYPBF's dual outputs with active voltage positioning and differential sensing directly match this requirement - one channel supplies core, the other supplies serdes. The integrated PMBus enables per-rail VOUT trim and margining during factory test, while on-chip NVM retains settings without host intervention. Compared to a discrete two-controller solution, the LTC7132 saves ~30% PCB area and reduces the BOM count by approximately 15 components.
Recommended
Server and Storage Point-of-Load Regulation
In server motherboards and storage controllers, the LTC7132IYPBF converts 12V bus voltage to 0.85V-1.2V for CPU/ASIC core rails and 1.5V-1.8V for DDR4/DDR5 memory termination at 25A per channel. ADI's PolyPhase architecture interleaves the two channels to cut input ripple by 50%, reducing bulk capacitor count on the 12V rail. The on-chip telemetry (VIN, IIN, POUT, temperature) via PMBus supports the Redfish/DCMI power monitoring APIs commonly used in hyperscale data centers. The 140-FBGA package's thermal pad supports 50W total dissipation with 4-layer PCB design.
Recommended
Industrial 24V PLC and Motor Control Rails
Industrial PLCs and motor controllers use 24V bus supplies that must comply with IEC 61131-2 transient specs (35V surges) and supply both logic (5V/3.3V) and analog (12V) rails at moderate current. The LTC7132IYPBF's 60V abs-max provides headroom against 24V surge tests without external TVS clamps, while the dual outputs support both a logic rail and a 12V analog rail from a single chip. ADI's industrial-grade I-temp variant (-40C-125C junction) is qualified for cabinet installations in unconditioned factory environments.
Recommended
Test and Measurement Instrumentation Power
ATE and bench-test equipment demand ultra-clean, programmable rails with fast transient response - the LTC7132IYPBF's active voltage positioning and 1MHz switching frequency deliver sub-1% overshoot at 25A load steps. The PMBus interface enables automated test sequencing: VOUT can be set per test step without manual adjustment, and PGOOD flags feed back to the test executive. The dual-output architecture powers both a high-current DUT rail (3.3V/25A) and a sensitive analog rail (1.2V/25A) from one IC, simplifying ATE chassis layout.
Recommended
High-Current PoL for ASIC/AI Accelerators
AI accelerator cards (GPU, TPU, custom ASICs) draw 50-100A at 0.6-0.9V core voltage with millisecond-scale load steps. Multiple LTC7132IYPBF ICs can be paralleled in multiphase for 100-200A rails, with current sharing enforced by the SYNC/PHSMD pins. The PMBus interface reports per-phase current and temperature for thermal balancing across phases, while the on-chip NVM lets each card boot into a predefined voltage without host setup. Compared to discrete controller+DrMOS designs, this approach reduces design time by 40-50% at moderate cost premium.
Recommended
Recommended Products Summary
Engineering reference data for LTC7132IYPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC7132MPYPBF | LTC7132EYPBF | LTC7132IY | LTC7131IYPBF | LTC7132IYPBF-TR |
|---|---|---|---|---|---|---|
| Package | 140-FBGA | 140-FBGA - same | 140-FBGA - same | 140-FBGA - same | 140-FBGA - same | 140-FBGA - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Outputs | 2 | 2 | 2 | 2 | 1 | 2 |
| Output Current per Channel | 25 A | 25 A | 25 A | 25 A | 25 A (single channel) | 25 A |
| Operating Junction Temperature | -40 C to +125 C | -55 C to +125 C | 0 C to +85 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Pb-Free BGA Balls | Yes (#PBF) | Yes (#PBF) | Yes (#PBF) | No (SnPb balls) | Yes (#PBF) | Yes (#PBF) |
| Digital Interface | PMBus/I2C with NVM | PMBus/I2C with NVM | PMBus/I2C with NVM | PMBus/I2C with NVM | PMBus/I2C with NVM | PMBus/I2C with NVM |
Key Differentiators
- Dual 25A outputs in a single integrated IC (vs LTC7131IYPBF)
- Integrated NVM for autonomous power-up (vs Generic PMBus competitors)
- Wide 4.5V-60V input supports 48V telecom buses (vs 12V-only POL regulators)
Design Notes
At VIN=12V, VOUT=1.0V, and 25A per channel, each channel dissipates approximately (12V - 1.0V) * 25A * (1 - efficiency) of power - estimated 15-25W total for both channels at 90% efficiency. The 140-FBGA exposed thermal pad requires at least 1 square inch of 4-layer PCB copper pour to maintain theta_JA below 25 C/W. ADI's EVAL board uses 4 oz copper on top and inner layers; designers should not reduce copper below 2 oz. Estimated: at 25W dissipation and theta_JA=25 C/W, junction rise is 125 C above ambient, requiring ambient below 100 C for 125 C max junction.
Place input bulk capacitors (typically 4x 22uF 100V ceramic + 1x 220uF aluminum polymer) within 5mm of the VIN1/VIN2 balls to limit input ripple and 60V transient stress. Use wide, short traces for SW1/SW2 switching nodes to minimize loop inductance; ADI's reference design uses 20 mil trace width with multiple vias in parallel. Differential VOUT sense traces (VOUT1S+/VOUT1S-) must be routed as a matched pair with Kelvin connection to the output capacitors - asymmetry in length or width degrades load-step accuracy by 1-2%.
Do not bypass the PMBus NVM programming step - the LTC7132IYPBF ships with default values that enable both channels at 1.0V, which may not match your application's requirements and create sequencing problems at first power. Use LTpowerPlay or the EVAL board to write custom configuration to NVM before deployment. Also verify the SYNC pin connection: leaving it floating puts the part into internal-oscillator mode but disables multiphase synchronization, while tying to a 1MHz external clock is required for synchronized parallel operation.
EMI performance depends critically on the SW node copper area - keep the SW1/SW2 nodes small and surrounded by ground pours to minimize radiated emissions. ADI's evaluation board passes EN 55022 Class B with the reference layout; reducing the input capacitor loop by even 2mm can increase radiated emissions above 30 MHz by 5-10 dB. Place the BST (bootstrap) capacitor within 2mm of the BST pin and use a 0.1uF ceramic rated for 6.3V minimum.
Compliance Information
#PBF suffix confirms Pb-free BGA balls per ADI datasheet. AEC-Q100 not applicable - this is an industrial/datacom part, not automotive grade. Halogen-free status not stated in provided data; ADI typical practice is to declare halogen-free but should be verified against the specific lot certificate.
