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Analog Devices Inc. LTM4615IV#PBF
- Part No.:
- LTM4615IV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 144-BLGA Module
- Datasheet:
-
LTM4615IV#PBF.pdf
- Description:
- DC DC CNVRTR 2X0.8-5V 0.4-2.6V
- Quantity:
- Payment:
- Shipping:
Inventory:1,454
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Product details
Overview
LTM4615IV#PBF from Analog Devices (formerly Linear Technology) is a triple-output µModule® power supply integrating two 4A synchronous buck regulators and one 1.5A very low dropout (VLDO™) linear regulator in a single 15mm × 15mm × 2.82mm LGA package. It operates from 2.375V–5.5V input for the DC/DC channels and 1.14V–3.5V for the VLDO, delivering programmable outputs from 0.8V–5V (buck) and 0.4V–2.6V (VLDO), with ±2% DC output error and output voltage tracking-ideal for FPGA core, I/O, and auxiliary rail sequencing in high-density telecom and industrial systems.
For engineers reviewing the LTM4615IV#PBF datasheet, LTM4615IV#PBF pinout, LTM4615IV#PBF application, or LTM4615IV#PBF equivalent, key selection considerations include its triple-rail integration, 1.25MHz current-mode switching architecture, 100mV typical dropout on the VLDO, PGOOD indicators per output, and support for dynamic load transients up to 2A/µs with <25mV peak deviation.
Technical Context
The LTM4615IV#PBF implements two independent constant-frequency (1.25MHz) current-mode synchronous buck regulators with integrated MOSFETs, inductors, and compensation-enabling fast transient response (<10µs settling) and inherent cycle-by-cycle current limiting. Each channel supports parallel operation via shared FB and COMP pins and features programmable soft-start, undervoltage lockout (1.6–2.3V), and ±1.3% load+line regulation.
The third rail is a standalone VLDO™ linear regulator using an NMOS source-follower pass device driven by an internal 5V boost converter (BOOST3 pin), achieving 40dB supply ripple rejection at switching frequency and 300µVRMS output noise (10Hz–1MHz). Its enable (EN3), power-good (PGOOD3), and feedback (FB3) pins operate independently of the buck sections, supporting isolated control and sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual 4A synchronous buck + 1.5A VLDO™ linear regulator - enables compact, low-noise multi-rail power for FPGAs and SERDES. |
| Input Voltage Range | Buck: 2.375V–5.5V; VLDO: 1.14V–3.5V - supports direct connection to intermediate bus rails (3.3V, 5V) and low-voltage battery/supply sources. |
| Output Voltage Range | Buck: 0.8V–5.0V; VLDO: 0.4V–2.6V - covers core logic (0.8–1.2V), I/O (1.5–1.8V), and analog/PLL (1.0–2.5V) rails with single-resistor programming. |
| Accuracy & Stability | ±2% total DC output error (buck); ±1% (VLDO); 1.25MHz fixed frequency - ensures predictable loop bandwidth and EMI profile without external compensation. |
| Thermal & Protection | Junction temp limit: 125°C; thermal shutdown; overcurrent (8A peak buck, 2.5A VLDO); PGOOD±7.5% window - provides robust fault coverage without external circuitry. |
| Efficiency & Noise | Up to 95% efficiency (buck); 300µVRMS VLDO output noise; 40dB VLDO ripple rejection at fSW - balances high efficiency with ultra-low noise for sensitive analog/RF supplies. |
| Package | 144-lead LGA, 15mm × 15mm × 2.82mm - enables bottom-side mounting in space-constrained PCBs and supports high-power density point-of-load designs. |
Pinout & Package
Package: 144-lead LGA (15mm × 15mm × 2.82mm), RoHS-compliant, Pb-free finish. Thermally enhanced with dedicated GND planes (GND1/GND2/GND3) and exposed thermal pads under SW1/SW2 and LDO_IN/LDO_OUT regions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Buck input power | Separate 2.375V–5.5V inputs per buck channel; decoupling required directly to adjacent GND pins. |
| VOUT1, VOUT2 | Buck output power | 4A continuous per rail; requires local 66–100µF ceramic output capacitance for <25mV transient droop. |
| LDO_IN, LDO_OUT | VLDO input/output power | LDO_IN accepts 1.14V–3.5V; LDO_OUT delivers 1.5A with 100mV typical dropout - minimum 1mA load required for accuracy. |
| FB1, FB2, FB3 | Feedback reference nodes | Internal 4.99kΩ resistor to VOUT; external RFB to GND sets output voltage - enables precise 0.8V–5V (buck) or 0.4V–2.6V (VLDO) programming. |
| RUN/SS1, RUN/SS2, EN3 | Enable & soft-start control | RUN/SSx: >0.8V enables buck; 1M pull-up + 1nF cap yields ~0.5ms soft-start; EN3: active-high VLDO enable with 1V VIH threshold. |
| TRACK1, TRACK2 | Output voltage tracking input | Accepts 0–0.8V ramp for master-slave rail sequencing; supports coincident or ratiometric tracking with external resistor dividers. |
| PGOOD1, PGOOD2, PGOOD3 | Open-drain power-good indicators | Assert low when output deviates >±7.5% from setpoint - enables system-level power sequencing and fault monitoring. |
| GND1, GND2, GND3 | Power ground returns | Separated grounds optimize noise isolation: GND1/GND2 for buck, GND3 for VLDO - mandatory star grounding at module footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output integration | Eliminates discrete buck + LDO design complexity; reduces BOM count by ≥12 components and saves ≥300mm² PCB area. |
| Current-mode 1.25MHz switching | Enables <10µs transient settling and stable operation with all-ceramic output capacitors - no external compensation needed. |
| VLDO™ architecture with BOOST3 | Delivers 1.5A at 100mV dropout while rejecting >40dB of switching noise - ideal for low-noise analog/PLL supplies without ferrite beads. |
| Output voltage tracking | Supports precise rail sequencing (e.g., FPGA core before I/O) via external resistor dividers on TRACK pins - no external controllers required. |
| Robust protection suite | Includes overcurrent, overtemperature, input UVLO, and PGOOD monitoring - meets industrial reliability requirements without added ICs. |
Applications
| FPGA Core & I/O Power | SERDES & High-Speed Interface Rails |
|---|---|
|
Use Scenario: Powering Xilinx UltraScale+ FPGA banks requiring independent 0.85V core, 1.2V HP I/O, and 1.0V auxiliary rails with strict sequencing. IC Role / Device Role / Timing Role: LTM4615IV#PBF provides all three rails in one package, with TRACK1/2 enabling controlled ramp-up order and PGOOD signals confirming regulation before configuration. Use Value: Reduces PCB layer count by consolidating three regulators, eliminates discrete sequencing ICs, and maintains <±1% rail tolerance during 2A/µs load steps. |
Use Scenario: Supplying 1.2V and 2.5V rails for 28Gbps PAM4 SERDES transceivers where switching noise on the 2.5V analog supply must be <1mV. IC Role / Device Role / Timing Role: LTM4615IV#PBF uses its VLDO output (2.5V @ 1.5A) with 40dB ripple rejection to clean switching noise from the buck-derived 3.3V input, while buck channels deliver clean 1.2V digital rails. Use Value: Achieves <300µVRMS noise on 2.5V rail without LC filters, preventing jitter accumulation and meeting IEEE 802.3bs eye diagram masks. |
| Industrial PLC CPU & Peripheral Power | Low-Noise Analog Signal Chain Supplies |
|
Use Scenario: Powering ARM Cortex-A9-based PLC controller (1.1V core, 1.5V DDR3, 3.3V peripherals) in thermally constrained DIN-rail enclosures. IC Role / Device Role / Timing Role: LTM4615IV#PBF's 2.82mm height allows bottom-side mounting; GND3 isolation prevents buck noise coupling into analog sensor interfaces. Use Value: Enables full 3-rail solution within 225mm² footprint; thermal resistance θJCbottom = 2–3°C/W ensures <125°C junction at 85°C ambient with 4A loads. |
Use Scenario: Generating ultra-low-noise 1.8V and 3.3V supplies for 24-bit delta-sigma ADCs and precision op-amps in test equipment. IC Role / Device Role / Timing Role: LTM4615IV#PBF's VLDO output (1.8V) powers ADC analog domain; buck outputs (3.3V) power digital interface - separated GND3 minimizes PSRR degradation. Use Value: Delivers 300µVRMS noise on 1.8V rail (10Hz–1MHz), enabling >110dB SNR without post-regulation LDOs or magnetic filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4650A-1IY#PBF | Single 25A µModule buck (no VLDO); larger 16mm × 16mm × 4.92mm package; higher efficiency (>94% at 12V→1V). | Replaces LTM4615IV#PBF only when single high-current rail is needed; cannot replicate triple-output or low-noise VLDO functionality. | Select if system requires >10A per rail and can accept separate LDO for noise-sensitive rails. |
| TPS546D24ARVFT | 6V-input, 60A dual-phase buck controller (external FETs/inductors); no integrated VLDO; requires external sequencing IC for tracking. | Offers higher current scalability but demands full power stage design; lacks integrated magnetics and noise-isolated linear rail. | Choose for custom high-efficiency designs where layout control and thermal optimization outweigh BOM simplicity. |
Compared with LTM4615IV#PBF, the LTM4650A-1IY#PBF trades triple-rail integration and VLDO noise suppression for higher single-rail current capability, while the TPS546D24ARVFT shifts complexity to external components to achieve greater flexibility and thermal headroom - neither matches the LTM4615IV#PBF's balance of compactness, low-noise analog support, and out-of-box sequencing.
Availability
LTM4615IV#PBF is available at Aetrix Electronics and suitable for telecom baseband processing, industrial PLC CPU power, and FPGA-based embedded vision systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTM4615IV#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, industrial, automotive, and communications markets.
The LTM4615IV#PBF belongs to the µModule® regulator family - engineered for rapid deployment of reliable, high-density power solutions in space- and thermal-constrained applications where board area, noise, and time-to-market are critical.
FAQ
What is the operating temperature range for the LTM4615IV#PBF?
The LTM4615IV#PBF is rated for –40°C to 125°C internal junction temperature, with guaranteed performance across this full range. Its LGA package features low thermal resistance (θJCbottom = 2–3°C/W), enabling reliable operation in industrial and telecom environments without derating at elevated ambient temperatures - a key distinction from commercial-grade variants like the LTM4615EV#PBF.
Can the LTM4615IV#PBF's VLDO output be used independently of the buck regulators?
Yes, the LTM4615IV#PBF's VLDO section operates independently: LDO_IN can be powered from an external 1.14V–3.5V source (e.g., a separate LDO or battery), and EN3 controls enable/disable without affecting the buck channels. The VLDO maintains ±1% output accuracy and 100mV dropout even when buck regulators are disabled or unpowered - confirmed in Electrical Characteristics Table (Note 3).
How does output voltage tracking work on the LTM4615IV#PBF?
Tracking on the LTM4615IV#PBF uses the TRACK1/2 pins to synchronize ramp rates between outputs. A master regulator's output is divided down (e.g., 1.5V → 0.75V) and fed to a slave's TRACK pin; the slave then follows that voltage ramp until reaching its programmed setpoint. This achieves precise rail sequencing - such as powering FPGA core before I/O - without external timing circuitry, as detailed in Figure 2 of the datasheet.
What external components are mandatory for basic LTM4615IV#PBF operation?
Only bulk input and output capacitors are required: minimum 22µF input (CIN) and 66µF output (COUT) per buck channel, plus 4.7µF on LDO_IN and 10µF on LDO_OUT. The LTM4615IV#PBF integrates switching controllers, MOSFETs, inductors, and compensation - eliminating need for external drivers, gate resistors, or loop compensation networks.
Does the LTM4615IV#PBF support current sharing between multiple units?
Yes, the LTM4615IV#PBF supports current sharing for higher output current: connecting FB1/FB2 and COMP1/COMP2 pins in parallel between two modules enables balanced load distribution. This is validated in the Applications Information section and requires matched external feedback resistors and identical input/output conditions to maintain ±5% current balance per channel.
LTM4615IV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 144-BLGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 2.38V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output 1:
- 0.8 ~ 5V
- Voltage - Output 2:
- 0.8 ~ 5V
- Voltage - Output 3:
- 0.4 ~ 2.6V
- Voltage - Output 4:
- -
- Current - Output (Max):
- 4A, 4A, 1.5A
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- 95%
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LGA (15x15)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4615IV#PBF FAQ
1.How can I place an order for LTM4615IV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4615IV#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 LTM4615IV#PBF reliable?
The price and inventory of LTM4615IV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4615IV#PBF is usually 5 days.
3.What payment methods are accepted for LTM4615IV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4615IV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4615IV#PBF?
LTM4615IV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4615IV#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 LTM4615IV#PBF?
For technical support, including LTM4615IV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4615IV#PBF requirements.
6.How does Aetrix verify that LTM4615IV#PBF is sourced from the original manufacturer or authorized distributors?
All LTM4615IV#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 LTM4615IV#PBF meets industry standards.
7.What is the process for return or replacement of LTM4615IV#PBF?
All LTM4615IV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM4615IV#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 LTM4615IV#PBF part is unused and in its original packaging.
Return procedure for LTM4615IV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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