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Analog Devices Inc. LTM4658IY#PBF
- Part No.:
- LTM4658IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 25-BFBGA, CSPBGA
- Datasheet:
-
LTM4658IY#PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 25CSPBGA
- Quantity:
- Payment:
- Shipping:
Inventory:970
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Product details
Overview
LTM4658IY#PBF from Analog Devices is a 10A, 0.5V–VIN step-down μModule® regulator in a 4mm × 4mm × 4.62mm BGA package. It integrates controller, MOSFETs, inductor, and support components; operates from 2.25V–5.5V input; delivers 10A continuous output at up to 2MHz switching frequency; and features Silent Switcher 2 architecture for ultralow EMI-used in optical modules and point-of-load telecom supplies.
For engineers reviewing the LTM4658IY#PBF datasheet, LTM4658IY#PBF pinout, LTM4658IY#PBF application, or LTM4658IY#PBF equivalent, key selection criteria include input voltage range (2.25V–5.5V), output current capability (10A), thermal performance (θJCbot = 6.8°C/W), multiphase synchronization support, and die temperature monitoring via SSTT pin.
Technical Context
The LTM4658IY#PBF employs constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop tuning. Its Silent Switcher 2 architecture embeds hot-loop bypass capacitors to suppress common-mode EMI while maintaining >90% efficiency at 3.3VIN/1VOUT.
It supports three operational modes: forced continuous (default at 2MHz or externally synchronized 1–2.6MHz), pulse-skipping (for light-load efficiency), and multiphase interleaving via MODE/SYNC and FREQ pins. Fault protection includes overvoltage, overcurrent, and overtemperature shutdown with PGOOD open-drain indicator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-supply operation from common intermediate bus rails (e.g., 3.3V, 5V) |
| Output Voltage Range | 0.5V to VIN - programmable via external resistor divider; enables core voltage regulation down to sub-1V logic domains |
| Max Output Current | 10A DC - sustained delivery with thermal derating per board layout; no external current-sense resistor required |
| Switching Frequency | 2MHz default, 1–2.6MHz sync range - high frequency enables compact external ceramic capacitors (22µF CIN, 100µF COUT) |
| Efficiency @ 3.3VIN/1VOUT | 92% at 10A - achieved via integrated low-RDS(on) MOSFETs and optimized power stage layout |
| Thermal Resistance (θJCbot) | 6.8°C/W - enables direct PCB copper thermal pad coupling for high-power density designs |
| EMI Performance | Ultralow radiated emissions - meets CISPR 32 Class B with minimal filtering due to Silent Switcher 2 architecture |
Pinout & Package
Package: 25-pin BGA (4mm × 4mm × 4.62mm), RoHS-compliant SAC305 solder finish, MSL Level 4, –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A3, B3, C3) | Power Input Supply | High-current path for internal controller and top-side MOSFET; requires low-inductance parallel routing and local 22µF ceramic decoupling |
| VOUT (B5, C5, D5, E5) | Regulated Power Output | Delivers up to 10A; connects directly to load and output capacitor bank (100µF + 2×22µF ceramics recommended) |
| GND (A1, A2, B2, C2, D2, E1, E2) | Power Ground Return | Shared return for input/output paths; must be tied to solid thermal pad under package for θJCbot = 6.8°C/W performance |
| FB (B4) | Feedback Reference Input | Senses output voltage via resistor divider; regulates VFB to 0.5V ±1%; supports remote sensing to AGND for ±100mV ground offset compensation |
| AGND (C4) | Analog Ground Reference | Reference node for error amplifier, bandgap, and soft-start circuitry; must connect to negative terminal of COUT for accurate load regulation |
| MODE/SYNC (D3) | Multiphase Control / Clock I/O | Configurable as sync input (1–2.6MHz) or clock output; selects pulse-skipping vs. forced continuous mode when tied to VIN or AGND |
| SSTT (D4) | Soft-Start / Tracking / Temp Monitor | 10µA pull-up enables soft-start timing (TSS = CSS × 50ms/V); tracks external voltage 0–0.5V; above 0.5V serves as die temp monitor (~4mV/°C) |
| PGOOD (E3) | Power Good Indicator | Open-drain output asserted high when VFB is within –3%/+10% of 0.5V; used for supply sequencing and system enable logic |
| RUN (A5) | Enable/Shutdown Control | Active-high logic: >0.4V enables regulation; <0.375V forces shutdown with zero quiescent current (<1µA) |
| FREQ (E4) | Frequency Programming | Resistor-to-AGND sets switching frequency (1–3MHz); tie to VIN for default 2MHz or external sync mode |
| COMP (A4) | Current Sense Compensation | Internal compensation node; tie COMP pins together across paralleled modules for matched current sharing |
| SW (B1, C1, D1) | Switch Node | Internal connection between top MOSFET and inductor; must be routed with minimum area to reduce EMI; not connected externally |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated hot-loop bypass capacitors reduce common-mode EMI by >30dB vs. prior generation, eliminating need for ferrite beads in most Class B applications |
| Die Temperature Monitoring | SSTT pin outputs ~4mV/°C analog voltage above 0.5V, enabling real-time thermal telemetry without external sensors |
| Multiphase Interleaving Support | Up to 4-phase parallel operation with automatic current sharing via shared COMP and synchronized MODE/SYNC; reduces input/output ripple by √N |
| Programmable Soft-Start & Tracking | Single capacitor on SSTT pin controls ramp rate (TSS = CSS × 50ms/V); enables precise rail sequencing with external voltage sources |
| Robust Fault Protection | Independent overvoltage (OVP), overcurrent (OCP), and overtemperature (OTP) circuits trigger immediate shutdown and PGOOD deassertion |
Applications
| Optical Transceiver Power | AI Accelerator Core Supply |
|---|---|
Use Scenario: Powers 100G/400G QSFP-DD and OSFP optical modules requiring tightly regulated 1V/1.2V rails with fast transient response to burst-mode laser driver loads. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 10A at 1V with <15μs settling time for 50% load steps; SSTT pin enables tracking with host FPGA VCCINT rail. Use Value: Eliminates discrete power stage design effort; Silent Switcher 2 ensures compliance with stringent optical module EMI limits without shielding. | Use Scenario: Supplies GPU or ASIC core voltage (0.75–0.95V) in edge AI inference accelerators where thermal density and dynamic current slew rates exceed 5A/μs. IC Role / Device Role / Timing Role: High-current μModule with current-mode control and 2MHz switching provides <200mV droop during 8A load transients and recovers within 15μs. Use Value: Integrated inductor and MOSFETs reduce solution size by 40% vs. discrete buck; θJCbot = 6.8°C/W enables direct thermal coupling to heatsink. |
| Industrial PLC I/O Module | 5G Radio Unit Bias Supply |
Use Scenario: Generates isolated 3.3V/5V auxiliary rails in programmable logic controller backplanes operating in harsh industrial environments (–40°C to +85°C ambient). IC Role / Device Role / Timing Role: Primary non-isolated DC/DC converter with wide 2.25–5.5V input range tolerates brownouts; PGOOD signals MCU only after full soft-start completion. Use Value: Built-in UVLO (2.1V threshold), OTP, and OVP ensure reliable startup and fault containment without external supervision circuitry. | Use Scenario: Powers RF front-end MMICs and DAC/ADC bias rails in massive MIMO 5G radio units where EMI must not interfere with adjacent 28GHz/39GHz signal chains. IC Role / Device Role / Timing Role: Low-noise, high-efficiency regulator with <100mVpp output ripple at 10A; operates in forced continuous mode synchronized to baseband clock to avoid beat frequencies. Use Value: Silent Switcher 2 architecture achieves >40dB lower radiated emissions than standard buck regulators, preventing receiver desensitization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down μModule regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4622IY#PBF | Dual 2.5A output, 3.6mm × 4.22mm × 1.82mm LGA; max 5.5VIN, 0.6V–5.5VOUT; no SSTT or die temp monitoring | Targeted at space-constrained dual-rail systems (e.g., DDR memory + core); lacks multiphase sync and thermal telemetry | Select when dual-output capability and smaller footprint outweigh need for 10A single-rail performance and thermal visibility. |
| TPS546D24RQFT | 10A standalone buck controller (no inductor); 4mm × 4mm QFN; supports 2.95–18VIN, 0.5–5.5VOUT; external MOSFETs required | Higher input voltage range suits 12V intermediate bus; requires external power stage design and loop compensation | Select when system already uses discrete MOSFETs or needs >5.5V input capability; trade-off is increased BOM count and layout complexity. |
Compared with LTM4658IY#PBF, the LTM4622IY#PBF offers dual outputs in half the height but sacrifices 10A capability and thermal monitoring, while the TPS546D24RQFT provides wider input range and flexibility at the cost of integration and EMI performance-making LTM4658IY#PBF optimal for compact, high-density, low-EMI 10A PoL applications.
Availability
LTM4658IY#PBF is available at Aetrix Electronics and suitable for optical transceivers, AI accelerator core supplies, and 5G radio unit bias applications requiring stable component supply, long-term lifecycle assurance, and traceable RoHS-compliant sourcing.
Supply support for LTM4658IY#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTM4658IY#PBF belongs to the μModule regulator product line, designed to simplify high-current DC/DC conversion by integrating power train and control into compact, thermally optimized packages for demanding point-of-load applications.
FAQ
What is the maximum continuous output current of the LTM4658IY#PBF?
The LTM4658IY#PBF delivers 10A continuous DC output current at VOUT = 1.5V with proper thermal management. Derating applies at higher VOUT or elevated ambient temperatures per the datasheet's thermal curves. The device includes overcurrent protection that limits peak output to 16A under short-circuit conditions, and its θJCbot = 6.8°C/W enables efficient heat transfer to the PCB thermal pad.
Does the LTM4658IY#PBF require external compensation components?
No, the LTM4658IY#PBF is internally compensated and requires no external compensation components. Its current-mode architecture and integrated error amplifier are factory-tuned for stability across the full output voltage range (0.5V to VIN) and with standard ceramic output capacitors (100µF + 2×22µF). This eliminates loop compensation design effort and ensures robust transient response without user tuning.
How does the SSTT pin function in the LTM4658IY#PBF?
The SSTT pin on the LTM4658IY#PBF serves three functions: soft-start timing (via 10µA pull-up and external capacitor), voltage tracking (0–0.5V input overrides internal 0.5V reference), and die temperature monitoring (>0.5V outputs ~4mV/°C). During normal operation, it transitions seamlessly between modes-enabling precise rail sequencing, external control, and real-time thermal telemetry without additional ICs.
Can multiple LTM4658IY#PBF devices be synchronized for higher current output?
Yes, the LTM4658IY#PBF supports multiphase interleaving with up to four units. One device acts as the master (FREQ resistor-set, MODE/SYNC as clock output), others as slaves (MODE/SYNC as input, FB tied to VIN). Shared COMP and RUN pins ensure matched current sharing and coordinated startup. This reduces input/output ripple by √N and distributes thermal load-enabling 40A solutions with identical LTM4658IY#PBF modules.
What package type and thermal specifications apply to the LTM4658IY#PBF?
The LTM4658IY#PBF uses a 25-pin BGA package measuring 4mm × 4mm × 4.62mm with SAC305 solder finish. Its thermal characteristics include θJCbot = 6.8°C/W (junction-to-board), θJA = 25.8°C/W (junction-to-ambient), and TJMAX = 125°C. The exposed thermal pad must be soldered to a solid copper plane for optimal heat dissipation-critical for sustaining 10A continuous output in compact layouts.
LTM4658IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 25-BFBGA, CSPBGA
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive and Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 10A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-CSPBGA (4x4)
LTM4658IY#PBF FAQ
1.How can I place an order for LTM4658IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4658IY#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 LTM4658IY#PBF reliable?
The price and inventory of LTM4658IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4658IY#PBF is usually 5 days.
3.What payment methods are accepted for LTM4658IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4658IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4658IY#PBF?
LTM4658IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4658IY#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 LTM4658IY#PBF?
For technical support, including LTM4658IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4658IY#PBF requirements.
6.How does Aetrix verify that LTM4658IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM4658IY#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 LTM4658IY#PBF meets industry standards.
7.What is the process for return or replacement of LTM4658IY#PBF?
All LTM4658IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM4658IY#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 LTM4658IY#PBF part is unused and in its original packaging.
Return procedure for LTM4658IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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