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Analog Devices Inc. LTM8047IY
- Part No.:
- LTM8047IY
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 45-BBGA Module
- Datasheet:
-
LTM8047IY.pdf
- Description:
- DC DC CONVERTER 2.5-12V
- Quantity:
- Payment:
- Shipping:
Inventory:2,158
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Product details
Overview
LTM8047IY from Analog Devices (formerly Linear Technology) is a 725VDC galvanically isolated flyback µModule DC/DC converter in a compact BGA package. It operates from 3.1V to 32V input, delivers up to 440mA at 2.5V–12V programmable output, and integrates controller, power switches, transformer, and support components - requiring only external input/output capacitors and one resistor for voltage setting. It is used in industrial sensors and ground-loop mitigation circuits where isolation and space-constrained board design are critical.
For engineers reviewing the LTM8047IY datasheet, LTM8047IY pinout, LTM8047IY application, or LTM8047IY equivalent, key selection considerations include its 725VDC isolation rating, -40°C to 125°C guaranteed operating temperature range, BGA thermal performance (θJB = 4°C/W), current-mode control architecture, and soft-start programmability via external capacitor - all essential for robust isolated power in harsh industrial environments.
Technical Context
The LTM8047IY implements a primary-side regulated flyback topology with current-mode control, enabling stable regulation without optocoupler feedback. Its internal architecture includes an integrated power transformer, Schottky rectifier on secondary side, and a bias regulator that can be powered either from VIN or an external 3.1V–15V source applied to the BIAS pin - improving efficiency at low VIN.
It features programmable undervoltage lockout via RUN pin (1.24V threshold), soft-start via SS pin (10µA constant-current charge), and output voltage set by a single resistor from ADJ to GND using a temperature-compensated exponential equation. The device is rated for 725VDC isolation verified by 1-second hi-pot test across primary–secondary barrier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 32V DC - supports wide-range industrial supplies including 5V, 12V, 24V rails and battery-backed systems. |
| Output Voltage Range | 2.5V to 12V - set by single external resistor (RADJ); enables flexible rail generation without trimming or multiple parts. |
| Max Output Current | 440mA at VOUT = 2.5V - decreases with higher VOUT or lower VIN; full load supported only within validated VIN–VOUT combinations per datasheet graphs. |
| Isolation Rating | 725VDC - 100% hi-pot tested (±725V for 1s), certified for reinforced insulation in safety-critical applications. |
| Operating Temp Range | -40°C to +125°C - fully guaranteed internal junction temperature range, suitable for extended industrial deployment. |
| Package Dimensions | 11.25mm × 9mm × 4.92mm BGA - surface-mount, thermally enhanced over-molded package compatible with standard SMT assembly. |
| Thermal Resistance | θJB = 4°C/W - indicates highly efficient heat transfer from junction to PCB, critical for high-power density designs without heatsinks. |
Pinout & Package
The LTM8047IY is housed in a 45-lead, RoHS-compliant (SAC305) BGA package measuring 11.25mm × 9mm × 4.92mm, with thermal vias optimized for bottom-side heat extraction. Pin functions are organized across four banks; GND and VOUT– serve as primary thermal conduction paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Bank 1) | Isolated output positive | High-side output node of secondary winding; requires local 10–100µF ceramic capacitor to VOUT– for stability and ripple suppression. |
| VOUT– (Bank 2) | Isolated output return | Secondary-side ground reference; forms isolation barrier with VOUT; primary thermal path - must connect to large copper pour. |
| GND (Bank 4) | Primary-side local ground | Reference for VIN, RUN, ADJ, SS, BIAS; second major thermal path - requires dense thermal vias to inner ground planes. |
| VIN (Bank 3) | Main input supply | Supplies internal regulator and power switches; must be bypassed with ≥2.2µF low-ESR ceramic capacitor near package. |
| RUN (F3) | Enable/disable control | Resistive divider sets UVLO threshold (1.24V); draws 2.5µA below threshold, enables converter and sources 10µA to SS above threshold. |
| ADJ (G7) | Output voltage programming | Connect resistor to GND to set VOUT (2.5–12V); uses temperature-compensated exponential equation RADJ = (28.4 × VOUT − 0.879) kΩ. |
| BIAS (H5) | Bias supply input | Accepts external 3.1–15V supply to improve efficiency; if unconnected, internal 3V regulator powers control circuitry from VIN. |
| SS (H6) | Soft-start timing | Capacitor to GND sets output ramp rate; 10µA constant current charges it, limiting inrush and preventing overshoot during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated isolation transformer | Eliminates need for external magnetics and optocoupler feedback - reduces BOM count and layout complexity in isolated SMPS designs. |
| Programmable output voltage | Single-resistor adjustment (2.5V–12V) enables one part number to serve multiple rail requirements without redesign. |
| 725VDC reinforced isolation | Fully tested hi-pot rating satisfies UL/IEC creepage/clearance requirements for industrial and medical auxiliary power supplies. |
| Thermally optimized BGA | θJB = 4°C/W and dual thermal pads (GND/VOUT–) enable >400mA operation on standard 4-layer FR4 without forced air or heatsink. |
| User-configurable soft-start | External capacitor on SS pin allows precise control of output voltage ramp time - critical for sequencing-sensitive loads and reducing stress on downstream regulators. |
Applications
| Industrial Sensors | Industrial Switches |
|---|---|
Use Scenario: Isolated power for 4–20mA loop-powered pressure/temperature transmitters in hazardous zones. IC Role / Device Role / Timing Role: Primary-side isolated DC/DC converter providing clean, floating 5V or 3.3V rail referenced to sensor ground - breaking ground loops between field and control room. Use Value: Enables accurate analog signal integrity by eliminating common-mode noise coupling; 725VDC isolation meets IEC 61000-4-5 surge immunity requirements. | Use Scenario: Powering Ethernet switch PHYs and management controllers in DIN-rail mounted industrial switches. IC Role / Device Role / Timing Role: Isolated auxiliary supply generating 3.3V from 24V bus for management MCU and PHY interface logic - maintaining separation between data and power domains. Use Value: Prevents fault propagation from power rail to communication interface; compact BGA footprint saves space on dense switch PCBs. |
| Ground Loop Mitigation | Medical Auxiliary Power |
Use Scenario: Providing isolated 5V/12V rails for analog front-end instrumentation amplifiers in multi-channel data acquisition systems. IC Role / Device Role / Timing Role: Galvanically isolated flyback converter decoupling measurement ground from system ground - eliminating offset drift caused by ground potential differences. Use Value: Improves measurement accuracy beyond 16-bit resolution; eliminates need for discrete isolation + regulator solutions. | Use Scenario: Generating isolated 5V for microcontroller-based patient monitoring peripherals connected to hospital-grade AC-DC adapters. IC Role / Device Role / Timing Role: Safety-isolated DC/DC stage delivering medically compliant auxiliary power - meeting 2×MOPP requirements when combined with appropriate PCB spacing. Use Value: Reduces certification burden by integrating tested 725VDC isolation into single component; RoHS-compliant SAC305 finish supports medical manufacturing standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RECOM RxxP220Dxx | Fixed-output (non-programmable), 2W output, 1500VDC isolation, DIP-24 package | Requires separate parts per output voltage; larger footprint; no soft-start or UVLO adjustment | Choose for ultra-high isolation (>1kV) and fixed-rail simplicity where board space is not constrained. |
| TI ISOW7841DWER | Digital isolator with integrated DC/DC (650mW), 5000VRMS isolation, SOIC-16 package | Lower power, limited to digital interface biasing; not suitable for analog sensor rails or >200mA loads | Choose only for isolated data + low-power bias (e.g., SPI/I²C level-shifting), not general-purpose isolated power. |
Compared with RECOM RxxP220Dxx and TI ISOW7841DWER, the LTM8047IY uniquely combines programmable output, 440mA capability, 725VDC isolation, and compact BGA packaging - making it optimal for space-constrained industrial systems requiring flexible, high-density isolated power without sacrificing thermal performance or design adaptability.
Availability
LTM8047IY is available at Aetrix Electronics and suitable for industrial sensors, ground-loop mitigation circuits, and isolated communication interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTM8047IY 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTM8047IY belongs to ADI's µModule family of fully integrated power solutions - designed specifically for engineers needing reliable, space-saving, and safety-certifiable isolated DC/DC conversion without custom magnetics or complex feedback design.
FAQ
What is the guaranteed operating temperature range for the LTM8047IY?
The LTM8047IY is guaranteed to meet all electrical specifications over the full internal junction temperature range of –40°C to +125°C. This is explicitly validated per datasheet Note 3 and distinguishes it from the commercial-grade LTM8047EY (0°C to 125°C). The I-grade qualification ensures reliable operation in demanding industrial environments such as factory automation and outdoor equipment where ambient temperatures fluctuate widely.
Does the LTM8047IY require an external transformer or optocoupler?
No, the LTM8047IY does not require an external transformer or optocoupler. It integrates a fully shielded isolation transformer, primary-side controller, power switches, Schottky rectifier, and support circuitry into a single 45-ball BGA package. Regulation is achieved via primary-side sensing - eliminating optocoupler aging, bandwidth limitations, and layout sensitivity while reducing bill-of-materials and board area.
How is output voltage programmed on the LTM8047IY?
Output voltage on the LTM8047IY is programmed by connecting a single resistor (RADJ) from the ADJ pin to GND. The value follows the temperature-compensated equation RADJ = (28.4 × VOUT − 0.879) kΩ. For example, 6.98kΩ sets VOUT = 5V. Table 1 in the datasheet provides pre-validated values for common outputs (2.5V, 3.3V, 5V, 8V, 12V), and a 12pF capacitor from ADJ to GND improves line regulation above 8V.
What is the purpose of the BIAS pin on the LTM8047IY?
The BIAS pin on the LTM8047IY accepts an external 3.1V–15V supply to power the internal control circuitry - bypassing the onboard linear regulator and improving conversion efficiency, especially at low VIN. When left unconnected, the LTM8047IY uses an internal 3V regulator fed from VIN. BIAS voltage must never exceed VIN, and the pin requires ≥4.7µF low-ESR ceramic decoupling capacitance for stable operation.
Can the LTM8047IY be used in hot-plug applications?
Yes, but with caution: direct hot-plug into a live supply may cause VIN ringing due to LC resonance between ceramic input capacitors and trace inductance. To ensure safe hot-plug operation, add a bulk electrolytic capacitor (e.g., 10–47µF, ≥16V) in parallel with the ceramic CIN - its ESR damps the resonance and prevents VIN overshoot beyond the 32V absolute maximum rating. This is documented in Linear Technology Application Note 88 and confirmed in the LTM8047IY datasheet Section "Hot-Plugging Safely".
LTM8047IY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 45-BBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Isolated Module
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 32V
- Voltage - Output 1:
- 2.5 ~ 12V
- Voltage - Output 2:
- -
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 440mA
- Power (Watts):
- -
- Voltage - Isolation:
- 725 V
- Applications:
- ITE (Commercial)
- Features:
- UVLO
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 45-BGA (11.25x9)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM8047IY FAQ
1.How can I place an order for LTM8047IY through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM8047IY 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 LTM8047IY reliable?
The price and inventory of LTM8047IY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM8047IY is usually 5 days.
3.What payment methods are accepted for LTM8047IY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM8047IY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM8047IY?
LTM8047IY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM8047IY 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 LTM8047IY?
For technical support, including LTM8047IY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM8047IY requirements.
6.How does Aetrix verify that LTM8047IY is sourced from the original manufacturer or authorized distributors?
All LTM8047IY 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 LTM8047IY meets industry standards.
7.What is the process for return or replacement of LTM8047IY?
All LTM8047IY units undergo pre-shipment inspection (PSI). If there is an issue with LTM8047IY, 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 LTM8047IY part is unused and in its original packaging.
Return procedure for LTM8047IY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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