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Analog Devices Inc. LTC3766MPGN#PBF
- Part No.:
- LTC3766MPGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3766MPGN#PBF.pdf
- Description:
- IC CONTROLLER SYNCH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,896
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Product details
Overview
LTC3766MPGN#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, PolyPhase-capable secondary-side synchronous forward controller for isolated DC/DC power supplies. It delivers precise average current limiting (±8 mV threshold), Direct Flux Limit™ protection against transformer saturation, and clean start-up into pre-biased loads - enabling robust 5V/15A battery charger designs with 94% efficiency at 48VIN.
For engineers reviewing the LTC3766MPGN#PBF datasheet, LTC3766MPGN#PBF pinout, LTC3766MPGN#PBF application, or LTC3766MPGN#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, 28-lead narrow SSOP package, secondary-side control architecture for fast transient response, and compatibility with the LTC3765 active-clamp primary controller.
Technical Context
The LTC3766MPGN#PBF implements a dual-loop control architecture: a voltage loop via FB/ITH error amplifier (gm = 2.7 mS, 0.600 V reference) and a precision average current-sense loop using IS+/IS– inputs (RS mode: 47–63 mV threshold). Its Direct Flux Limit™ circuit monitors volt-second product on VSEC to prevent transformer saturation without sacrificing transient performance.
It integrates two independent gate drivers (FG/SG with 1.0 Ω pull-down, 1.5 Ω pull-up), pulse transformer outputs (PT+/PT–) for isolated communication with LTC3765, and dual bias generation: a high-voltage linear regulator controller (VIN-powered, MODE-selectable 7.0 V or 8.5 V output) plus an internal VAUX LDO (15 V input, 7.0–8.9 V regulated VCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFB Reference | 0.600 V ±8 mV - sets precise output voltage regulation point in servo loop |
| Average Current Sense Threshold | 55 mV (typ) in resistor-sense mode - enables accurate 15 A output current limit with minimal sensing loss |
| Direct Flux Limit Accuracy | ±4% to ±6% - guarantees no transformer saturation under dynamic load or line transients |
| Operating Temperature Range | –55°C to 150°C - qualified for military, avionics, and heavy industrial environments |
| Package | 28-lead narrow plastic SSOP - 11.6 mm × 7.6 mm footprint with exposed thermal pad (θJA = 95°C/W) |
| Oscillator Frequency Range | 75 kHz to 500 kHz - programmable via RFS/SYNC or PLL-synchronized to external clock |
| Gate Driver Pull-Down RON | 1.0 Ω (FG/SG) - ensures fast MOSFET turn-off to minimize shoot-through risk |
Pinout & Package
Package: 28-lead narrow plastic SSOP (GN), 11.6 mm × 7.6 mm, exposed thermal pad (Pin 29 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SG (Pin 1) | Synchronous MOSFET gate driver output | Drives low-side synchronous rectifier; Kelvin-connected to SW for reverse-current protection |
| FG (Pin 2) | Forward MOSFET gate driver output | Drives high-side forward switch; timing coordinated with PT+ via FGD delay resistor |
| VSEC (Pin 3) | Volt-second limit sense input | Connects RC network to monitor transformer volt-seconds; terminates PWM on-time if threshold exceeded |
| MODE (Pin 4) | LV/HV operating mode select | Tie to GND or VCC to set VCC regulator output to 7.0 V or 8.5 V - matches MOSFET gate drive requirements |
| FB (Pin 6) | Inverting input of main error amplifier | Connects to voltage divider from VSOUT for closed-loop output voltage regulation |
| ITH (Pin 7) | Error amplifier output | Hosts Type II/III compensation network between ITH and GND to stabilize voltage loop |
| RUN (Pin 8) | Enable/shutdown control | 1.22 V rising threshold with 50 mV hysteresis - used for bias monitoring or remote ON/OFF control |
| VS+, VS– (Pins 12, 13) | Differential remote sense inputs | Enable true Kelvin sensing at load; reject common-mode noise up to 75 dB CMRR |
| IS+, IS– (Pins 18, 17) | Current sense differential inputs | Support resistor-based (low-side) or current-transformer sensing with selectable trip thresholds |
| PT+, PT– (Pins 25, 26) | Pulse transformer encoded outputs | Transmit PWM duty and timing info across isolation barrier to LTC3765 primary controller |
Key Features
| Feature | Design Value |
|---|---|
| Secondary-side control architecture | Enables direct load monitoring and sub-10 µs transient response - critical for battery charging and telecom systems |
| Direct Flux Limit™ | Prevents transformer saturation during overload or startup without compromising dynamic performance or requiring core reset windings |
| Clean start-up into pre-biased output | Allows hot-plug operation in redundant power systems without output voltage overshoot or latch-up |
| True remote differential sensing | Compensates for PCB trace IR drop up to 15 V common-mode range - maintains ±0.1% output accuracy at load |
| Self-starting architecture with LTC3765 | Eliminates need for separate auxiliary bias supply - reduces BOM count and improves reliability in isolated converters |
Applications
| Isolated Battery Chargers | 48V Telecommunication Systems |
|---|---|
Use Scenario: High-power Li-ion battery charging in base station backup systems with strict efficiency and thermal constraints. IC Role / Device Role / Timing Role: Secondary-side PWM controller managing synchronous rectification, current limiting, and transformer flux control. Use Value: 94% efficiency at 15 A output and Direct Flux Limit™ ensure safe, reliable charging under wide input (36–72 V) and load transients. | Use Scenario: Isolated 48 V DC-DC conversion for distributed power architecture in telecom rack systems. IC Role / Device Role / Timing Role: Core secondary-side controller coordinating with LTC3765 to deliver tightly regulated 5 V/15 A with remote sensing. Use Value: True differential remote sense (75 dB CMRR) and –55°C to 150°C rating maintain ±0.5% output stability across harsh telecom environments. |
| Avionics Power Supplies | Military Vehicle DC-DC Converters |
Use Scenario: MIL-STD-704 compliant 28 V to 5 V conversion in airborne navigation and comms equipment. IC Role / Device Role / Timing Role: Robust secondary-side controller providing fault-tolerant regulation, overvoltage protection, and transformer saturation immunity. Use Value: Extended temperature qualification (–55°C to 150°C) and integrated OVP/OTP ensure compliance with DO-160 environmental testing. | Use Scenario: Ruggedized 24 V/28 V to 5 V isolated power for vehicle-mounted radar and EW subsystems. IC Role / Device Role / Timing Role: High-reliability forward controller with adaptive dead-time control (SGD/FGD pins) and clean pre-biased start-up. Use Value: Self-starting architecture eliminates external bias rails; 28-lead SSOP with exposed pad supports conduction-cooled chassis mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary-side forward controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3766IGN#PBF | Same functionality and pinout; rated for –40°C to 125°C (vs. –55°C to 150°C) | Not qualified for extended military/avionics temperature extremes | Select when commercial/industrial temp range suffices and cost optimization is prioritized |
| LTC3766HUFD#PBF | Identical electrical specs; 4 mm × 5 mm QFN package (θJA = 43°C/W vs. 95°C/W) | Better thermal performance but requires different PCB layout and reflow profile | Select for space-constrained, high-power-density designs where thermal management is critical |
Compared with LTC3766IGN#PBF, the LTC3766MPGN#PBF provides guaranteed operation down to –55°C and up to 150°C - essential for deployed military hardware. Versus LTC3766HUFD#PBF, it trades superior thermal resistance for proven manufacturability in legacy SSOP assembly lines and easier thermal pad inspection.
Availability
LTC3766MPGN#PBF is available at Aetrix Electronics and suitable for isolated battery chargers, 48V telecommunication systems, avionics power supplies, and military vehicle DC-DC converters requiring stable component supply across extended temperature ranges.
Supply support for LTC3766MPGN#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 and maintains full support for its high-performance power management portfolio.
The LTC3766 belongs to Linear's isolated forward controller product line, designed specifically for high-efficiency, high-reliability secondary-side controlled power supplies in telecom, aerospace, and defense applications.
FAQ
What is the operating temperature range of the LTC3766MPGN#PBF?
The LTC3766MPGN#PBF is tested and guaranteed over –55°C to 150°C, making it suitable for extreme-environment applications including military, avionics, and heavy industrial systems. This extended range exceeds the –40°C to 125°C rating of the LTC3766IGN#PBF and matches the high-temp qualification of the LTC3766H series while adding cold-start capability.
How does the Direct Flux Limit™ function protect the transformer in the LTC3766MPGN#PBF?
The LTC3766MPGN#PBF monitors the volt-second product applied to the main power transformer via the VSEC pin. When the integrated VSEC voltage exceeds its internal threshold (±4% to ±6% accuracy), the PWM on-time is terminated immediately - preventing core saturation during overload, startup, or line transients without degrading transient response or requiring additional reset circuitry.
Can the LTC3766MPGN#PBF operate without the LTC3765 primary controller?
Yes - the LTC3766MPGN#PBF supports standalone mode when the MODE pin is biased with a 100 kΩ or 50 kΩ resistor to ground. In this configuration, PT+ outputs a standard PWM signal for direct primary MOSFET drive, PT– generates a reference clock, and FGD is ignored. However, full active-clamp forward functionality requires the LTC3765.
What are the key differences between the SSOP and QFN packages of the LTC3766MPGN#PBF?
The LTC3766MPGN#PBF uses the 28-lead narrow SSOP (GN) package. Its QFN counterpart is the LTC3766MPUFD#PBF. Both share identical electrical specifications and temperature rating, but differ thermally: SSOP has θJA = 95°C/W, while QFN achieves θJA = 43°C/W due to its exposed thermal pad - enabling higher power density in thermally constrained layouts.
How does the LTC3766MPGN#PBF achieve clean start-up into a pre-biased output?
The LTC3766MPGN#PBF incorporates dedicated circuitry that detects output voltage presence before enabling gate drivers. During start-up, it regulates based on sensed output voltage rather than relying on soft-start ramp alone - preventing reverse current flow, output overshoot, and potential damage to downstream loads in hot-swap or redundant power configurations.
LTC3766MPGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Direct Flux Limit™, PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Synchronous Forward Controller
- Voltage - Input:
- 5V ~ 32V
- Voltage - Supply:
- 5V ~ 10V
- Current - Supply:
- 5 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3766MPGN#PBF FAQ
1.How can I place an order for LTC3766MPGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3766MPGN#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 LTC3766MPGN#PBF reliable?
The price and inventory of LTC3766MPGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3766MPGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3766MPGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3766MPGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3766MPGN#PBF?
LTC3766MPGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3766MPGN#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 LTC3766MPGN#PBF?
For technical support, including LTC3766MPGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3766MPGN#PBF requirements.
6.How does Aetrix verify that LTC3766MPGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3766MPGN#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 LTC3766MPGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3766MPGN#PBF?
All LTC3766MPGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3766MPGN#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 LTC3766MPGN#PBF part is unused and in its original packaging.
Return procedure for LTC3766MPGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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