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Analog Devices Inc. LTM4658EY#PBF
- Part No.:
- LTM4658EY#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 25-BFBGA, CSPBGA
- Datasheet:
-
LTM4658EY#PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 25CSPBGA
- Quantity:
- Payment:
- Shipping:
Inventory:510
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Product details
Overview
LTM4658EY#PBF from Analog Devices is a 10A, low-voltage-input step-down µModule regulator in a 4mm × 4mm × 4.62mm BGA package. It operates from 2.25V to 5.5V input, delivers 0.5V–VIN output with ±0.5% FB reference accuracy, employs Silent Switcher 2 architecture for ultralow EMI, and supports multiphase parallel operation for higher current systems.
For engineers reviewing the LTM4658EY#PBF datasheet, LTM4658EY#PBF pinout, LTM4658EY#PBF application, or LTM4658EY#PBF equivalent, key selection considerations include its 2MHz default switching frequency, 10A continuous output capability, integrated current-mode control for fast transient response, die temperature monitoring via SSTT pin, and compatibility with external frequency synchronization from 1MHz to 2.6MHz.
Technical Context
The LTM4658EY#PBF integrates a constant-frequency peak current-mode controller, power MOSFETs, shielded inductor, and support components into a single BGA module. Its internal hot-loop bypass capacitors and symmetric layout enable Silent Switcher 2 performance-achieving <10mV/μs EMI without shielding or ferrites at 2MHz switching.
It features dual-mode operation: pulse-skipping for high light-load efficiency (IQ = 1.6mA) or forced continuous mode for low-noise regulation. Multiphase interleaving is supported via MODE/SYNC pin clock output and FREQ pin phase programming, enabling precise current sharing across up to six parallel modules with <±5% load imbalance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports direct regulation from common intermediate rails (e.g., 3.3V, 5V) without pre-regulation |
| Output Current | 10A continuous - rated at full load with thermal derating curves defined for VIN/VOUT/TA combinations |
| Output Voltage Range | 0.5V to VIN - programmable via external resistor divider; 0.5V FB reference enables sub-1V core rail generation |
| Switching Frequency | 2MHz default, 1–2.6MHz sync range - enables compact 82nH inductor and ceramic-only output filtering |
| Efficiency | 92% @ 3.3VIN/1VOUT/10A - achieved via low-RDS(ON) MOSFETs, optimized gate drive, and minimal conduction losses |
| Thermal Resistance | θJCbot = 6.8°C/W - bottom-side thermal path enables efficient PCB copper pour heat sinking |
| Protection Features | OVP, OCP (16A peak), OTP - autonomous shutdown with automatic restart after fault clearance |
Pinout & Package
Package: 25-pin BGA (4mm × 4mm × 4.62mm), 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 input node requiring short, wide traces and local 22µF ceramic decoupling to PGND |
| VOUT (B5, C5, D5, E5) | Power Output Terminal | Delivers regulated 10A output; must connect directly to output capacitor bank with Kelvin AGND return |
| GND (A1, A2, B2, C2, D2, E1, E2) | Power Ground | Common return for input/output currents; multiple pins reduce impedance and improve thermal spreading |
| AGND (C4) | Analog Ground Reference | Kelvin-sense reference for FB and COMP; connects to negative terminal of output capacitor for remote sensing accuracy |
| FB (B4) | Feedback Input | Senses voltage at 0.5V reference; sets output via RA/RB divider; tied to VIN to disable error amp in subordinate phases |
| COMP (A4) | Error Amplifier Compensation | Internal compensation node; tied together across parallel modules for shared current-mode loop stability |
| MODE/SYNC (D3) | Multiphase Control | Configurable as clock input (sync) or output (master); selects pulse-skip vs. forced continuous mode |
| FREQ (E4) | Frequency Programming | Resistor-to-AGND sets switching frequency (1–3MHz); tied to VIN for default 2MHz or external sync |
| SSTT (D4) | Soft-Start/Tracking/Temp | 10µA pull-up enables soft-start timing; 0–0.5V enables voltage tracking; >0.5V provides ~4mV/°C die temp readout |
| RUN (A5) | Enable Control | Active-high logic; ≥0.4V enables regulation; hysteresis prevents chatter near threshold |
| PGOOD (E3) | Power Good Indicator | Open-drain output asserting when FB is within –3%/+10% of 0.5V; requires external pull-up |
| SW (B1, C1, D1) | Switch Node | High-dI/dt connection to internal MOSFETs and inductor; must be routed with solid copper or left floating per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated hot-loop bypass capacitors and symmetrical layout reduce radiated EMI by >30dB vs. prior µModule generations |
| Current-Mode Control | Provides cycle-by-cycle overcurrent protection and <15μs settling time for 50% load steps without external compensation |
| Multiphase Interleaving Support | Enables N-phase parallel operation with <±5% current mismatch and RMS input ripple reduction up to 70% (6-phase) |
| Dual-Mode Operation | Pulse-skipping achieves 90%+ efficiency at 100mA load; forced continuous ensures low-noise 2MHz regulation |
| Die Temperature Monitoring | SSTT pin outputs ~4mV/°C analog voltage-enabling real-time thermal margining without external sensors |
Applications
| Point-of-Load Regulation | Optical Module Power |
|---|---|
Use Scenario: Providing tightly regulated 0.85V/10A to ASICs in high-speed networking switches with strict voltage tolerance (±1.5%). IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering core power with <157mV dynamic deviation under 0–50–0% load transients. Use Value: Eliminates need for external current-sense amplifiers or discrete PMIC sequencing logic due to integrated tracking and PGOOD. | Use Scenario: Powering 100G/400G optical transceivers (QSFP-DD, OSFP) requiring low-noise, fast-response 3.3V bias rails. IC Role / Device Role / Timing Role: Low-EMI step-down converter supplying analog front-end circuitry where conducted noise could impair signal integrity. Use Value: Silent Switcher 2 compliance allows placement near RF sections without shielding-reducing board area and BOM cost. |
| Industrial Edge Computing | Telecom Baseband Processing |
Use Scenario: Delivering 1.2V/10A to FPGA-based edge AI accelerators in fanless industrial enclosures with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Thermally robust µModule with θJCbot = 6.8°C/W enabling conduction-cooled designs without heatsinks. Use Value: Integrated temperature monitoring via SSTT pin allows firmware-driven thermal throttling before junction exceeds 125°C. | Use Scenario: Supplying multiple synchronized 1.8V/10A rails to multi-core baseband processors in 5G macrocell units requiring rail sequencing. IC Role / Device Role / Timing Role: Master-slave multiphase controller supporting precise voltage tracking and interleaved startup across 4 independent LTM4658EY#PBF units. Use Value: Eliminates external sequencer ICs and reduces system-level timing jitter between parallel rails by >50ns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-density, high-current step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4655EY#PBF | Same 4mm × 4mm BGA footprint but 6A rating; lacks SSTT temperature monitoring and multiphase clock output | Suitable only for ≤6A loads; cannot replace LTM4658EY#PBF in 10A or thermally monitored systems | Select when lower current and cost are prioritized over thermal visibility and scalability |
| TPS546D24RQFPR | 6x6mm QFN, 10A, 1.5–16V input; no integrated inductor; requires external compensation and current sense | Demands more design effort for loop stability and EMI filtering; lacks Silent Switcher 2 EMI performance | Choose when input voltage exceeds 5.5V or when discrete inductor selection is required for custom thermal/size trade-offs |
Compared with LTM4655EY#PBF, the LTM4658EY#PBF delivers 67% higher current density and adds die temperature telemetry; versus TPS546D24RQFPR, it reduces design cycle time by integrating magnetics and EMI mitigation-enabling functional validation in <72 hours versus weeks for discrete solutions.
Availability
LTM4658EY#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, optical module manufacturing, and industrial edge computing applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant BGA packaging.
Supply support for LTM4658EY#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 power management markets.
The LTM4658EY#PBF belongs to the µModule regulator product line-engineered to deliver complete, verified, high-current DC/DC solutions in miniature packages for space-constrained, thermally demanding point-of-load applications.
FAQ
What is the maximum output current capability of the LTM4658EY#PBF under continuous operation?
The LTM4658EY#PBF delivers 10A continuous output current at 1.5V output with 3.3V input and 25°C ambient, as specified in the Electrical Characteristics table. Derating applies above 85°C ambient or with elevated VIN/VOUT ratios; full 10A is maintained up to 125°C junction temperature when using recommended PCB copper area and airflow.
Does the LTM4658EY#PBF require external compensation components?
No, the LTM4658EY#PBF is internally compensated. The COMP pin (A4) is provided for optional external network connection in multiphase configurations but does not require external components for single-module operation. Stability is guaranteed across the full output capacitor range (100µF–470µF ceramic) without added compensation.
How is output voltage programmed on the LTM4658EY#PBF?
Output voltage is set using a resistor divider from VOUT to FB and FB to AGND, based on the internal 0.5V reference. Equation VOUT = 0.5V × (RA + RB)/RB applies. For example, 1.0V output uses RA = 100kΩ and RB = 100kΩ. The FB pin must be referenced to AGND-not GND-to maintain remote sensing accuracy against ground offsets.
Can the LTM4658EY#PBF operate with an input voltage below 2.25V?
No. The absolute minimum input voltage is 2.25V per Absolute Maximum Ratings and Electrical Characteristics. Operation below this level risks undervoltage lockout activation (VIN_UVLO rising threshold = 2.1V typical) and may cause unregulated output or startup failure. The device is not characterized or guaranteed for sub-2.25V operation.
What thermal metrics define the LTM4658EY#PBF's cooling requirements?
The LTM4658EY#PBF specifies θJCbot = 6.8°C/W (junction-to-case, bottom), θJA = 25.8°C/W (junction-to-ambient, 2s2p layout), and TJMAX = 125°C. Effective cooling requires ≥4cm² of 2oz copper connected to GND and VOUT pads beneath the BGA, plus optional thermal vias to inner/ground planes. No external heatsink is needed for 10A operation at ≤60°C ambient with proper PCB layout.
LTM4658EY#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)
LTM4658EY#PBF FAQ
1.How can I place an order for LTM4658EY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4658EY#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 LTM4658EY#PBF reliable?
The price and inventory of LTM4658EY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4658EY#PBF is usually 5 days.
3.What payment methods are accepted for LTM4658EY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4658EY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4658EY#PBF?
LTM4658EY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4658EY#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 LTM4658EY#PBF?
For technical support, including LTM4658EY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4658EY#PBF requirements.
6.How does Aetrix verify that LTM4658EY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM4658EY#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 LTM4658EY#PBF meets industry standards.
7.What is the process for return or replacement of LTM4658EY#PBF?
All LTM4658EY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM4658EY#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 LTM4658EY#PBF part is unused and in its original packaging.
Return procedure for LTM4658EY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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