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Analog Devices Inc. LT3748MPMS#TRPBF
- Part No.:
- LT3748MPMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3748MPMS#TRPBF.pdf
- Description:
- IC REG CTRLR FLYBACK 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,819
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Product details
Overview
LT3748MPMS#TRPBF from Analog Devices is a high-voltage isolated flyback controller IC designed for primary-side regulation in 100V-input telecom, automotive, and industrial power supplies. It drives an external N-channel MOSFET, operates in boundary mode, supports 5V–100V input, delivers up to ~25W output (e.g., 12V/2A), and eliminates need for opto-isolators or third-winding feedback.
For engineers reviewing the LT3748MPMS#TRPBF datasheet, LT3748MPMS#TRPBF pinout, LT3748MPMS#TRPBF application, or LT3748MPMS#TRPBF equivalent, key selection criteria include its –55°C to 150°C operating junction temperature, primary-side sensing architecture, 1.9A average gate drive capability, programmable soft-start, and AEC-Q100-qualified MP-grade reliability for harsh-environment designs.
Technical Context
The LT3748MPMS#TRPBF implements boundary-mode (critical conduction) control using primary-side flyback waveform sampling to derive isolated output voltage information-no opto-isolator or auxiliary winding required. Its internal error amplifier compares a sampled RFB/RREF current-derived signal against a 1.223V bandgap reference, enabling precise output regulation via two external resistors.
It features integrated 7V INTVCC regulation for gate drive, programmable EN/UVLO with 1.223V threshold and 2.4µA hysteresis current, and a dedicated TC pin for diode forward-voltage temperature compensation. The controller enforces minimum on-time (250ns) and off-time (700ns) constraints and supports discontinuous operation at light loads via VC-pin-controlled variable delay timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 100V - supports wide-range industrial and telecom inputs without external pre-regulation. |
| Operating Junction Temp | –55°C to 150°C - qualified for extended-temperature military, automotive, and downhole applications. |
| INTVCC Regulation | 7.0V ±0.2V - powers internal gate driver; enables direct connection to VIN if ≤20V and no third winding used. |
| EN/UVLO Threshold | 1.223V rising - sets minimum startup input voltage via resistor divider; includes 2.4µA hysteresis sink for stable turn-on/turn-off. |
| Gate Drive Capability | 1.9A avg source/sink - drives high-Ciss MOSFETs for multi-watt isolated outputs with fast 16ns rise/fall times. |
| SENSE Threshold Range | 15mV to 110mV - adjustable current-limit window via VC pin; supports precise peak-current control across load range. |
| Soft-Start Threshold | 0.65V - initiates switching when SS capacitor charges to this level; prevents inrush current and transformer saturation. |
Pinout & Package
LT3748MPMS#TRPBF is housed in a 16-lead plastic MSOP package with four leads removed (12-lead exposed pad variant), rated for 150°C max junction temperature and θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input supply reference | Bypassed locally; supplies start-up circuitry and serves as reference for RFB feedback network. |
| EN/UVLO (3) | Enable & undervoltage lockout input | Resistor-divider programmed; below 1.223V disables regulation and reduces quiescent current to <1µA. |
| INTVCC (5) | Internally regulated gate driver supply | 7V output; powers GATE driver; may be tied to VIN if ≤20V and no third winding is used. |
| GATE (6) | N-MOSFET gate driver output | Switches between INTVCC and GND; delivers 1.9A avg current with 16ns edge speeds into 3.3nF load. |
| SENSE (7) | Primary-side current sense input | Kelvin-connected to MOSFET source resistor; senses peak current for cycle-by-cycle limiting (15–110mV range). |
| GND (8,9) | Power and signal ground | Dual ground pins reduce noise coupling; must be connected to low-impedance PCB ground plane near SENSE and RSENSE. |
| SS (10) | Soft-start timing capacitor node | Sources 5µA to external capacitor; switching begins when voltage reaches 0.65V - controls ramp rate and inrush. |
| VC (11) | Error amplifier compensation & current limit control | Connect RC network for loop stability; voltage sets SENSE threshold (min 15mV, max 110mV) and enables discontinuous mode. |
| TC (12) | Temperature compensation current source | Sinks 0.55V/RTC current into RREF to offset diode VF drift; enables ±1% output regulation over temperature. |
| RREF (14) | Ground-referenced reference resistor node | Accepts 6.04kΩ (±1%) resistor; forms voltage divider with RFB to set output via 1.223V internal bandgap reference. |
| RFB (16) | Primary-side feedback resistor node | Connected to MOSFET drain; converts flyback pulse amplitude to current proportional to VOUT × NPS for primary-side sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolators and third windings - reduces BOM cost, improves long-term reliability, and simplifies transformer design. |
| Boundary mode operation | Enables zero-current switching at secondary side, improving load regulation accuracy and allowing smaller magnetics vs CCM. |
| Extended temperature grade | –55°C to 150°C junction rating meets MIL-PRF-38535 and AEC-Q100 Grade 1 requirements for aerospace and under-hood automotive use. |
| Programmable thermal compensation | TC pin + RTC resistor actively cancels diode forward-voltage drift - maintains stable output voltage across full operating temperature range. |
| Robust gate driver | 1.9A avg source/sink with 16ns edges ensures reliable drive of high-power MOSFETs even with layout parasitics and capacitive loads. |
Applications
| Telecom Isolated DC/DC Converter | Automotive High-Voltage Power Supply |
|---|---|
Use Scenario: 36–72V telecom input converted to isolated 12V/2A output for base station control logic and interface circuits. IC Role / Device Role / Timing Role: Primary-side flyback controller managing MOSFET switching, boundary-mode timing, and output voltage regulation without secondary feedback components. Use Value: Achieves >85% efficiency and ±3% load/line regulation while eliminating opto-isolator aging and third-winding coupling errors. |
Use Scenario: 12V battery system with cold-crank tolerance up to 100V transient, powering isolated CAN transceivers and sensor interfaces. IC Role / Device Role / Timing Role: High-reliability flyback controller delivering stable 5V/1A output with AEC-Q100 MP-grade qualification for engine bay mounting. Use Value: Maintains regulation during 100V load-dump events and operates continuously from –40°C to +125°C ambient with minimal derating. |
| Industrial Isolated Auxiliary Supply | Military Ruggedized Power Module |
Use Scenario: 24–48V industrial bus powering isolated I/O modules requiring reinforced insulation and 4kV surge immunity. IC Role / Device Role / Timing Role: Boundary-mode controller implementing primary-side sensing and programmable UVLO to withstand brownouts and line surges. Use Value: Enables compact, certified isolation barrier design meeting IEC 61000-4-5 Level 4 without optocoupler lifetime uncertainty. |
Use Scenario: Downhole oilfield electronics requiring operation at –55°C startup and sustained 150°C junction temperature in sealed enclosures. IC Role / Device Role / Timing Role: Extended-temperature flyback controller providing primary-side regulation and thermal compensation for mission-critical telemetry power. Use Value: Delivers verified performance over full –55°C to +150°C range with no parameter drift-induced regulation loss or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748IMS#TRPBF | Rated for –40°C to 125°C junction; lacks extended low-temp capability and MP-grade screening. | Suitable for commercial/industrial environments but not qualified for MIL-STD-883 or AEC-Q100 Grade 0/1 extended temp ranges. | Select when cost sensitivity outweighs need for –55°C operation or military reliability assurance. |
| UCC28911DR | TI's primary-side controller with fixed 70kHz frequency; no boundary-mode operation or TC pin for thermal compensation. | Limited to lower-power (<10W) applications; lacks programmable soft-start and precise current-limit adjustment via VC pin. | Choose for simpler, lower-cost designs where output power ≤8W and temperature drift compensation is not required. |
Compared with LT3748IMS#TRPBF, the LT3748MPMS#TRPBF adds guaranteed –55°C startup and enhanced screening for long-life reliability in extreme environments; versus UCC28911DR, it offers boundary-mode efficiency, wider input range, higher gate drive, and active thermal compensation - critical for >15W isolated supplies in demanding applications.
Availability
LT3748MPMS#TRPBF is available at Aetrix Electronics and suitable for telecom power systems, automotive high-voltage auxiliary supplies, and industrial isolated auxiliary rails requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3748MPMS#TRPBF 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 LT3748MPMS#TRPBF belongs to Analog Devices' high-voltage isolated power controller product line, engineered specifically for primary-side regulated flyback converters in safety-critical, high-reliability applications demanding extended temperature operation and long-term stability.
FAQ
What is the maximum input voltage supported by the LT3748MPMS#TRPBF?
The LT3748MPMS#TRPBF supports an absolute maximum input voltage of 100V on the VIN pin, with operational specification from 5V to 100V. This makes it suitable for telecom (–48V nominal with 100V transients), industrial 24–48V buses, and automotive load-dump tolerant designs. Exceeding 100V risks permanent damage per Absolute Maximum Ratings.
Does the LT3748MPMS#TRPBF require an opto-isolator or third winding for regulation?
No - the LT3748MPMS#TRPBF uses primary-side flyback waveform sampling to derive output voltage information directly from the MOSFET drain node, eliminating the need for opto-isolators or auxiliary transformer windings. This architecture reduces component count, improves long-term reliability, and avoids optocoupler aging and nonlinearities.
How does the TC pin on the LT3748MPMS#TRPBF improve output voltage stability?
The TC pin on the LT3748MPMS#TRPBF sources a temperature-proportional current (0.55V / RTC) into the RREF node to compensate for the negative temperature coefficient of the output diode's forward voltage (VF). By selecting RTC per the application's diode characteristics, the LT3748MPMS#TRPBF maintains ±1% output regulation across –55°C to +150°C junction temperature.
What is the purpose of the VC pin on the LT3748MPMS#TRPBF?
The VC pin on the LT3748MPMS#TRPBF serves dual functions: it sets the SENSE pin current-limit threshold (15–110mV range) and provides the error amplifier's compensation node. Connecting an RC network from VC to GND stabilizes the control loop, while varying VC voltage adjusts peak current limit - enabling programmable overload protection and light-load discontinuous mode operation.
Is the LT3748MPMS#TRPBF pin-compatible with other LT3748 variants?
Yes - the LT3748MPMS#TRPBF shares identical pinout, footprint, and electrical behavior with all LT3748 MSOP variants (E/I/H/MP grades), including LT3748IMS#TRPBF and LT3748HMS#TRPBF. Differences are limited to temperature grading, screening, and reliability testing - no PCB layout changes are required when upgrading to the MP grade for extended temperature or military applications.
LT3748MPMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 5V ~ 100V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3748MPMS#TRPBF FAQ
1.How can I place an order for LT3748MPMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3748MPMS#TRPBF 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 LT3748MPMS#TRPBF reliable?
The price and inventory of LT3748MPMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3748MPMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3748MPMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3748MPMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3748MPMS#TRPBF?
LT3748MPMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3748MPMS#TRPBF 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 LT3748MPMS#TRPBF?
For technical support, including LT3748MPMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3748MPMS#TRPBF requirements.
6.How does Aetrix verify that LT3748MPMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3748MPMS#TRPBF 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 LT3748MPMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3748MPMS#TRPBF?
All LT3748MPMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3748MPMS#TRPBF, 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 LT3748MPMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3748MPMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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