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Analog Devices Inc. LTM4655IY
- Part No.:
- LTM4655IY
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 144-BBGA Module
- Datasheet:
-
LTM4655IY.pdf
- Description:
- EN55022B CMPLINT 40V DUAL 4A SNG
- Quantity:
- Payment:
- Shipping:
Inventory:3,534
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Product details
Overview
LTM4655IY from Analog Devices is an EN55022B-compliant, ultralow-noise 40V dual-output µModule DC/DC regulator delivering up to 4A per channel in independent positive or negative configurations (e.g., ±12V), with 0.5V–26.5V output range, 250kHz–3MHz programmable switching frequency, and integrated power MOSFETs, inductors, and filters in a single BGA package.
For engineers reviewing the LTM4655IY datasheet, LTM4655IY pinout, LTM4655IY application, or LTM4655IY equivalent, this page provides verified technical context for low-EMI industrial power design, avionics supply sequencing, dual-rail instrumentation systems, and high-reliability embedded applications requiring radiated emissions compliance and concurrent polarity outputs.
Technical Context
The LTM4655IY implements two fully independent constant-frequency current-mode buck regulators, each configurable for noninverting step-down (VOUTn+ = 0.5V–26.5V) or inverting buck-boost (VOUTn– = –0.5V––26.5V), with input voltage ranges of 3.1V–40V (positive) or 3.6V–40V (negative), where |VINn − VOUTn–| ≤ 40V. Each channel features analog current monitoring (IMONna), programmable soft-start, and dedicated PGOOD indicators.
Its integrated clock generator delivers phase-interleaved CLKOUT1/CLKOUT2 (180° out-of-phase) at 200kHz–3MHz with ±2.5% accuracy, enabling synchronized multi-phase operation. The device includes a 5V/25mA LDO (LDOOUT), temperature sensing (TEMP+/TEMP–), and dual-channel protection including overcurrent foldback, thermal shutdown, and UVLO with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V–40V for positive-VOUT; 3.6V–40V for negative-VOUT (|VIN − VOUT–| ≤ 40V) |
| Output Current per Channel | Up to 4A continuous (positive), up to 3A (negative, configuration-dependent) |
| Output Voltage Range | ±0.5V to ±26.5V (programmable via ISETna–SVOUTn– resistor divider) |
| Switching Frequency | 250kHz–3MHz (adjustable via fSETn resistor or external CLKIN sync) |
| DC Output Accuracy | ±1.67% total error over line, load, and temperature (–40°C to 125°C) |
| EMI Compliance | EN55022 Class B radiated emissions compliant without external filtering |
| Package | 16mm × 16mm × 5.01mm BGA, RoHS-compliant SAC305 finish (LTM4655IY#PBF) |
Pinout & Package
144-ball BGA (16mm × 16mm × 5.01mm), SnPb or RoHS-compliant SAC305 terminal finish, MSL Level 3, operating junction temperature up to 125°C. Thermal resistance θJCbot = 2.6°C/W enables high-power dissipation through bottom-side thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Main input power supply for Channel 1 and Channel 2 | Accepts 3.1V–40V (positive config) or 3.6V–40V (negative config); supports independent input sources |
| VOUT1+, VOUT2+ | Positive output terminals | Regulated positive outputs (0.5V–26.5V); referenced to VOUT1–/VOUT2–, not GND |
| VOUT1–, VOUT2– | Negative output reference / common rail | Serves as return path for both positive and negative outputs; enables true dual-polarity operation |
| ISET1a/ISET1b, ISET2a/ISET2b | Output voltage programming inputs | Set VOUTn+ or |VOUTn–| via resistor divider to SVOUTn–; precision 50µA reference current |
| IMON1a/IMON1b, IMON2a/IMON2b | Analog current monitor outputs | Provide 40kΩ/V scaled current sense (IOUTn+/IIMONna = 40k); only functional on positive-VOUT channels |
| RUN1, RUN2 | Enable/disable control inputs | Logic-high threshold 1.2V (130mV hysteresis); allows independent channel sequencing and fault isolation |
| PGOOD1, PGOOD2 | Power-good status outputs | Open-drain indicators asserting when output is within ±7.5% of target; require external pull-up |
| LDOOUT | Integrated 5V/25mA LDO output | Supplies bias for external circuitry; used to drive clock generator and optional EXTVCC rails |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent channels | Each channel operates autonomously-configurable for +12V, –12V, +5V/–5V, or +8A single-rail-enabling flexible rail generation without cross-coupling |
| EN55022B radiated emissions compliance | Meets Class B limits without external EMI filters; achieved via internal layout optimization, shielded inductors, and spread-spectrum clocking |
| Phase-interleaved clock generation | On-chip 180°-phase-shifted CLKOUT1/CLKOUT2 reduces input ripple current and improves system-level EMC performance |
| Analog current monitoring (positive-VOUT only) | Provides real-time IOUTn+ feedback (VIMONna = 0.25Ω × IOUTn+) for telemetry, load balancing, or closed-loop current limiting |
| Robust protection suite | Includes overcurrent foldback, thermal shutdown, input UVLO with hysteresis, and independent PGOOD monitoring per channel |
Applications
| Avionics Power Distribution | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Supplying isolated ±15V analog front-ends and 5V digital logic in flight control computers under wide-input-voltage aircraft bus conditions (18–32V). IC Role / Device Role / Timing Role: Dual-channel µModule regulator generating concurrent ±12V/5V rails with EN55022B compliance for avionics EMI certification. Use Value: Eliminates need for discrete filter components and external clock synchronization, reducing board area by >40% versus discrete solutions while meeting DO-160 Section 21 radiated emissions. |
Use Scenario: Powering analog sensor interfaces (±10V), isolated CAN transceivers (5V), and FPGA I/O banks (3.3V) in modular industrial controllers. IC Role / Device Role / Timing Role: Configured as dual 4A positive outputs (5V + 3.3V) with independent RUN pin control for safe hot-swap sequencing. Use Value: Enables precise rail sequencing (via RUN1/RUN2 delay), current telemetry (IMON), and fault isolation-critical for SIL2-certified safety subsystems. |
| Test & Measurement Instrumentation | Medical Imaging Signal Chain |
Use Scenario: Generating ultra-low-noise ±12V supplies for high-resolution ADC drivers and op-amp signal conditioning stages in portable spectrum analyzers. IC Role / Device Role / Timing Role: Operated in negative-VOUT mode to deliver clean –12V with <10mVP-P ripple, leveraging internal shielded inductors and optimized layout. Use Value: Achieves <–70dBc PSRR at 1MHz and <10µVRMS output noise-directly improving ENOB by ≥1.5 bits in 16-bit data acquisition systems. |
Use Scenario: Providing tightly regulated ±5V and 3.3V rails for CCD/CMOS sensor biasing, timing ASICs, and low-noise preamplifiers in portable ultrasound units. IC Role / Device Role / Timing Role: Used as a dual-output module with one channel in positive mode (3.3V) and one in negative mode (–5V), sharing common VOUT– reference. Use Value: Reduces component count by 22 parts vs. discrete solution while maintaining <±0.5% cross-regulation and passing IEC 60601-1 EMI requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output µModule regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4653IY#PBF | Single-channel 40V/4A µModule; no negative-VOUT capability; smaller 11.9mm × 16mm × 3.51mm package | Only suitable for single-rail or paralleled positive-only designs; lacks dual-polarity flexibility and integrated clock generator | Select when space-constrained designs require only one regulated rail and do not need concurrent ± outputs or phase interleaving. |
| LTM4651IY#PBF | 40V/8A single-channel µModule; supports only positive-VOUT; higher peak current but no independent channel control | Cannot generate dual-polarity outputs or enable independent sequencing; lacks IMON and temperature sensing pins | Choose for high-current single-rail applications (e.g., FPGA core supply) where dual-channel independence and polarity flexibility are unnecessary. |
Compared with LTM4653IY and LTM4651IY, the LTM4655IY uniquely supports concurrent positive/negative outputs, per-channel enable and monitoring, and integrated clock generation-making it the only option among the three for EN55022B-compliant dual-rail instrumentation and avionics systems requiring full rail independence.
Availability
LTM4655IY is available at Aetrix Electronics and suitable for avionics power distribution, industrial PLC I/O modules, test & measurement instrumentation, and medical imaging signal chain applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTM4655IY 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTM4655IY belongs to Analog Devices' µModule regulator family-designed specifically for space-constrained, high-reliability applications demanding integrated magnetics, low EMI, and simplified system-level power design without sacrificing performance or flexibility.
FAQ
What is the maximum output current capability of the LTM4655IY in negative-VOUT configuration?
The LTM4655IY delivers up to 3A continuous output current in negative-VOUT– mode (e.g., –12V) when configured with VIN = 12V and fSW = 550kHz. At –5V output, it supports up to 3A; at –24V, derated to 1.25A. Actual capability depends on input voltage, output voltage, switching frequency, and thermal management-see Figure 32 in the datasheet for derating curves. The LTM4655IY maintains ±1.67% DC accuracy across this range.
Can the LTM4655IY generate both positive and negative outputs simultaneously from a single input source?
Yes-the LTM4655IY supports concurrent positive and negative outputs (e.g., +12V and –12V) using a single input supply (e.g., 24V). Channel 1 is configured in noninverting step-down (VOUT1+), Channel 2 in inverting buck-boost (VOUT2–), sharing VOUT1–/VOUT2– as common reference. This eliminates need for separate input rails and enables compact dual-rail designs critical in test equipment and imaging systems.
Does the LTM4655IY support synchronization to an external clock, and what is the capture range?
Yes-the LTM4655IY supports PLL-based synchronization via CLKIN1/CLKIN2 pins. The capture range is 250kHz–550kHz (10%–90% duty cycle) or 1.3MHz–3MHz (40%–60% duty cycle), allowing precise phase alignment across multiple modules. This feature enables deterministic ripple cancellation and reduced input capacitor stress in multi-module systems-verified in Application Note AN-1447.
Is analog current monitoring available on both channels of the LTM4655IY?
No-IMON1a/IMON1b and IMON2a/IMON2b analog current monitoring is functional only when the corresponding channel is configured for positive-VOUT+ operation. It is disabled in negative-VOUT– mode. For example, if Channel 1 is set to +5V and Channel 2 to –5V, only Channel 1 provides valid current telemetry. This limitation is documented in the "Current Monitor" section of the LTM4655IY datasheet Rev. B.
What thermal management considerations apply to the LTM4655IY in high-power operation?
The LTM4655IY has θJCbot = 2.6°C/W, requiring a robust PCB thermal pad (≥8 cm² copper, 2 oz, with ≥8 thermal vias) connected to internal ground planes. At 4A per channel and 12V input, junction temperature rise exceeds 45°C above ambient-derating is mandatory above 85°C ambient. The device includes thermal shutdown at TJ > 125°C, but sustained operation above 105°C reduces lifetime. Layout guidelines are specified in Figure 55 of the datasheet.
LTM4655IY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 144-BBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 40V
- Voltage - Output 1:
- 0.5 ~ 26.5V
- Voltage - Output 2:
- -0.5 ~ -26.5V
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 4A, 4A
- Power (Watts):
- 96 W
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- Adjustable Output
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-BGA (16x16)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4655IY FAQ
1.How can I place an order for LTM4655IY through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4655IY 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 LTM4655IY reliable?
The price and inventory of LTM4655IY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4655IY is usually 5 days.
3.What payment methods are accepted for LTM4655IY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4655IY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4655IY?
LTM4655IY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4655IY 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 LTM4655IY?
For technical support, including LTM4655IY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4655IY requirements.
6.How does Aetrix verify that LTM4655IY is sourced from the original manufacturer or authorized distributors?
All LTM4655IY 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 LTM4655IY meets industry standards.
7.What is the process for return or replacement of LTM4655IY?
All LTM4655IY units undergo pre-shipment inspection (PSI). If there is an issue with LTM4655IY, 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 LTM4655IY part is unused and in its original packaging.
Return procedure for LTM4655IY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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