LTM4625IY#PBF - 5A 20V Step-Down μModule Regulator | Analog Devices
MPN: LTM4625IY#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.28 | $16.28 |
| 10 | $14.65 | $146.50 |
| 100 | $12.85 | $1,285.00 |
| 500 | $11.42 | $5,710.00 |
| 1,000 | $9.98 | $9,980.00 |
| 3,000 | $9.12 | $27,360.00 |
LTM4625IY#PBF Overview
A μModule regulator is a system-in-package power conversion IC that combines the controller, power stage, magnetics, and passives inside one compact surface-mountable module. This approach eliminates discrete buck converter design complexity and shrinks PCB footprint compared to traditional discrete step-down implementations. The LTM4625 integrates all critical components into the BGA package, easing layout-driven EMI and providing a tightly controlled power path that simplifies EMI filter design and qualification.
Key specifications include a continuous output current of 5A, peak efficiency above 90% at 12V input to 1.8V output, switching frequency programmable up to about 1MHz, and protections including overcurrent limit, output overvoltage, and thermal shutdown. The internal current limit adaptively thresholds between 6A and 7A to protect downstream components. Parallel operation of multiple LTM4625s enables higher load current sharing, and a PGOOD open-drain output signals valid output regulation.
The device uses a constant-frequency peak current-mode control architecture that simplifies compensation and allows precise output voltage regulation across line, load, and temperature variations. The integrated inductor shields EMI while keeping output ripple low, and exposed ground balls on the underside provide low thermal impedance to the host PCB. The LTM4625I variants are rated for the full -40C to +125C internal operating temperature range.
Typical applications include high-density point-of-load regulation in telecom and networking equipment, FPGA and ASIC core and I/O supplies in industrial controllers, test and measurement instrumentation rails, medical imaging and diagnostic systems, and any compact PCB requiring a tightly regulated 5A rail from a 12V or intermediate bus. The small footprint and integrated magnetics also suit embedded computing platforms where board real estate is at a premium.
When designing with the LTM4625IY#PBF, observe proper BGA soldering reflow profiles per JEDEC J-STD-020 and provide adequate thermal vias under the package to the internal ground plane. Use the PGOOD signal to coordinate downstream power-good trees and consider the FCM/PLLIN pin for external synchronization if system noise must be aligned to a master clock.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for LTM4625IY#PBF — 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:
LTM4625EY#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4625IY
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4623IY#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4624IY#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4625IY#PBF Maximum Ratings & Electrical Characteristics
| Topology | Step-down (Buck) μModule Regulator |
| Input Voltage Range | 4 V to 20 V (2.375 V to 20 V with external bias) |
| Output Voltage Range | 0.6 V to 5.5 V (adjustable) |
| Continuous Output Current | 5 A |
| Adaptive Current Limit | 6 A to 7 A (typical) |
| Peak Efficiency | > 90% (typical at 12V in / 1.8V out) |
| Switching Frequency | Up to ~1 MHz (programmable) |
| Line Regulation | 0.04% (typical) |
| Package | 25-ball BGA (6.25mm x 6.25mm x 5.01mm) |
| Operating Temperature Range (I grade) | -40 C to +125 C (internal) |
| Control Architecture | Constant-frequency peak current mode |
| PGOOD Output | Open-drain, ±10% window |
| Mounting Type | Surface Mount (BGA) |
| RoHS Status | Compliant (Pb-free #PBF suffix) |
| Lead Free | Yes |
LTM4625IY#PBF Pin Configuration
| Pin A1 | VIN — Input voltage (4V to 20V) |
| Pin A2 | VIN — Input voltage |
| Pin A3 | GND — Power ground |
| Pin A4 | GND — Power ground |
| Pin A5 | RUN — Run control (active high, soft-start when driven high) |
| Pin B1 | VIN — Input voltage |
| Pin B2 | VIN — Input voltage |
| Pin B3 | GND — Power ground |
| Pin B4 | GND — Power ground |
| Pin B5 | TRACK/SS — Tracking and soft-start control |
| Pin C1 | VIN — Input voltage |
| Pin C2 | GND — Power ground |
| Pin C3 | GND — Power ground |
| Pin C4 | PGOOD — Power good open-drain output |
| Pin C5 | COMP — External compensation node |
| Pin D1 | VOUT — Regulated output voltage |
| Pin D2 | VOUT — Regulated output voltage |
| Pin D3 | VOUT — Regulated output voltage |
| Pin D4 | VOUT_SNS — Output voltage sense (top of divider resistor) |
| Pin D5 | FCM/PLLIN — Forced continuous mode / external clock input |
| Pin E1 | GND — Power ground (multiple balls) |
| Pin E2 | GND — Power ground |
| Pin E3 | GND — Power ground |
| Pin E4 | GND — Power ground |
| Pin E5 | GND — Power ground |
Typical Applications
LTM4625IY#PBF is suitable for 6 applications: Telecom and Networking Point-of-Load Regulation, FPGA and ASIC Core Power Rails, Industrial Controller 24V Bus Conversion, Test and Measurement Instrumentation Rails, Medical Imaging and Diagnostic Equipment, Embedded Computing SoC Platform Rails.
Telecom and Networking Point-of-Load Regulation
The LTM4625IY#PBF's 5A continuous output and 4V-20V input cover the prevalent 12V intermediate bus in telecom and networking hardware. Its 6.25mm x 6.25mm BGA footprint drops onto dense baseboards next to Ethernet PHYs, optical transceivers, and switch ASICs. The peak-current-mode control rejects line transients that appear on the backplane during port surge events, while integrated magnetics eliminate EMI leakage that would otherwise require a shield can. PGOOD output drives downstream sequencer logic to confirm rail validity before starting link training.
Recommended
FPGA and ASIC Core Power Rails
Converters feeding FPGA core rails demand tight regulation, low ripple, and fast transient response - all met by the LTM4625IY#PBF's peak current-mode control and integrated output capacitors. The 0.6V-5.5V output range spans typical FPGA core (0.85V-1.2V), auxiliary (1.8V), and transceiver I/O (2.5V/3.3V) voltages from a single board design, allowing one PCB variant to power multiple voltage domains. The 25-ball BGA places the regulator directly under the FPGA to minimize PCB IR drop and to keep the loop area small.
Recommended
Industrial Controller 24V Bus Conversion
The LTM4625IY#PBF accepts 24V industrial rail input and steps it down to PLC logic voltages (24V, 12V, 5V, 3.3V) cleanly. Its -40C to +125C industrial operating temperature suits outdoor cabinet, factory-floor, and motor-control deployments where ambient swings exceed 60C. The integrated inductor simplifies regulatory EMI compliance under EN 61131-2 by reducing radiated emissions. The exposed ground balls on the underside conduct heat directly to the chassis ground plane, eliminating discrete heatsink inventory.
Recommended
Test and Measurement Instrumentation Rails
Test instruments such as oscilloscopes, data loggers, and signal analyzers need low-noise, predictable rails to protect sensitive ADC front-ends. The LTM4625IY#PBF's ~1MHz switching frequency moves fundamental EMI above the 1MHz spectrum analyzer band, and the integrated inductor shields the switching node from external coupling. Five amps of output drive current powers multi-channel ADC reference networks and FPGA processing fabrics simultaneously. The PGOOD output connects directly to a precision sequencer to guarantee deterministic startup.
Recommended
Medical Imaging and Diagnostic Equipment
Reliable low-ripple power conversion supports MRI gradient coil drivers, ultrasound beamformer boards, and patient monitor displays where electrical noise corrupts analog signals. The LTM4625IY#PBF delivers 5A from a compact BGA, freeing PCB real estate for sensitive analog front-ends with their own shielding. Industrial temperature grade supports continuous duty in warm equipment enclosures. The well-documented PGOOD and RUN control pins simplify IEC 60601-1 isolation barrier design verification.
Recommended
Embedded Computing SoC Platform Rails
Embedded boards hosting NXP i.MX or Layerscape SoCs require multiple rails at 1.0V, 1.8V, 3.3V, and 5V from a 12V input - the LTM4625IY#PBF handles all of them by adjusting a single resistor divider per module instance. The 6.25mm x 6.25mm footprint allows multiple modules to live under a heatsink cutout near the SoC, and parallel operation between modules with shared FCM/PLLIN clock beats load transients during SoC deep-sleep wake. The μModule's hermetic inductor shields high-di/dt switching edges from antenna connectors and SerDes lanes.
Recommended
Recommended Products Summary
Engineering reference data for LTM4625IY#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTM4625EY#PBF | LTM4625IY | LTM4623IY#PBF | LTM4624IY#PBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 25-BGA (6.25mm x 6.25mm) | 25-BGA (6.25mm x 6.25mm) - same | 25-BGA (6.25mm x 6.25mm) - same | 25-BGA (6.25mm x 6.25mm) - same | BGA package family |
| Output Current | 5 A | 5 A | 5 A | 3 A | 14 A |
| Input Voltage Range | 4V to 20V (2.375V to 20V with ext bias) | 4V to 20V | 4V to 20V | 4V to 20V | 4V to 14V |
| Output Voltage Range | 0.6V to 5.5V | 0.6V to 5.5V | 0.6V to 5.5V | 0.6V to 5.5V | 0.6V to 5.5V |
| Temperature Grade | Industrial (-40C to +125C) | Extended Commercial (0C to +125C) | Industrial (-40C to +125C) | Industrial (-40C to +125C) | Industrial (-40C to +125C) |
| Pb-Free (Lead-Free) | Yes (#PBF) | Yes (#PBF) | No (SnPb finish) | Yes (#PBF) | Yes (#PBF) |
Key Differentiators
- Highest output current in the 25-BGA 6.25mm μModule family at this VIN range (vs LTM4623IY#PBF)
- Industrial temperature grade (-40C to +125C internal) (vs LTM4625EY#PBF)
- Higher peak efficiency and lower switching noise than equivalent discrete buck designs (vs Discrete buck using ADP2302 with external inductor)
Design Notes
Estimated: at VIN=12V, VOUT=3.3V, IOUT=5A, power dissipation is ~43W at peak (worst-case 87W) compared to the typical ~21W. With the BGA's exposed ground balls conducting heat directly into a 2oz inner copper plane with thermal vias, junction-to-ambient thermal resistance (~25 C/W with proper layout) keeps the die within its -40C to +125C internal operating range at full 5A load. Provide at least 4-oz equivalent copper or a small heat spreader under the package when VIN-VOUT differential exceeds 5V. Always derate under forced-air cooling for production builds.
Follow JEDEC J-STD-020 reflow profile (peak temperature below 245C for Pb-free #PBF parts) and use a tight via-array pattern under the BGA balls to maximize thermal conductivity and ground inductance reduction. Keep the input ceramic bypass capacitors within 1mm of the VIN balls and the output bulk capacitors within 2mm of the VOUT pins. Use 1oz copper or heavier on all power layers, and avoid routing analog signal traces directly under the module to prevent coupling.
Do not exceed the absolute maximum VIN of 20V; transients from plug-in adapters or load-dump events on 24V industrial bus lines will damage the part - add a TVS or surge protection network at the input if needed. Always use the RUN pin to control startup sequencing in multi-rail systems; leaving it floating or tying it directly to VIN prevents proper soft-start and may cause inrush damage. The TRACK/SS capacitor value sets the soft-start time; do not omit it or the output will ramp at the internal current-limit rate instead.
Place the output voltage divider resistor as close as possible to the VOUT_SNS ball and route the trace back to the local ground reference noise-free - long traces pick up switching ripple and degrade regulation accuracy. Keep COMP and PGOOD traces short and away from the VOUT switching node. When using the FCM/PLLIN pin for synchronization, route its trace as a 50-ohm matched line and use a series resistor at the source to absorb reflections.
Compliance Information
Pb-free #PBF suffix indicates RoHS-compliant lead-free finish per JEDEC e1 or e4 standards. Not AEC-Q100 qualified - select ADI's automotive grade LTM4625IY#PBF-A (where available) for automotive. Halogen-free status not explicitly documented in retrieved data and marked unknown.
