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Analog Devices Inc. LTC3806EDE#PBF
- Part No.:
- LTC3806EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3806EDE#PBF.pdf
- Description:
- IC REG CTRLR FLYBACK 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,566
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Product details
Overview
LTC3806EDE#PBF from Analog Devices (formerly Linear Technology) is a current-mode synchronous flyback DC/DC controller driving N-channel MOSFETs for dual-output telecom and industrial power supplies. It delivers 3.3V/3A and 2.5V/3A outputs, features 250kHz fixed-frequency operation, ±1% internal voltage reference, and 89% typical maximum duty cycle. Designed for high-efficiency, low-noise 48V telecom, 24V industrial, and Power over Ethernet applications.
For engineers reviewing the LTC3806EDE#PBF datasheet, LTC3806EDE#PBF pinout, LTC3806EDE#PBF application, or LTC3806EDE#PBF equivalent, key selection criteria include programmable undervoltage lockout (±2%), soft-start control for PoE compliance, synchronous rectification for cross-regulation, gate driver dead time (100ns), and thermal design with θJA = 34°C/W in DFN package.
Technical Context
The LTC3806EDE#PBF implements constant-frequency current-mode control with an integrated 250kHz oscillator, dual gate drivers (G1 primary, G2 secondary), and internal 6.9V INTVCC regulator. Its error amplifier (transconductance 650 μMho) drives the ITH pin to modulate peak current via the SENSE input.
It supports forced continuous conduction mode for optimal cross-regulation across multiple outputs, uses leading-edge blanking on the SENSE pin, and incorporates hysteresis (91mV) on the RUN pin comparator for noise immunity during input voltage monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 250 kHz typical - ensures EMI spectrum remains outside audible range and simplifies filter design. |
| Max Duty Cycle | 89% typical - enables high step-down ratio operation from 72V input to 3.3V output without excessive turns ratio. |
| VFB Reference | 1.230 V ±1% - provides precise master output regulation and stable feedback loop performance. |
| VUVL+ Threshold | 15 V ±1 V - programmable input UVLO allows tailored start-up behavior for 48V telecom systems. |
| INTVCC Output | 6.9 V / 50 mA - powers gate drivers and logic; requires ≥4.7μF local ceramic bypass for transient current handling. |
| SENSE Threshold | 150 mV typical - sets current limit with minimal power loss in sense resistor at full load. |
| Gate Driver Dead Time | 100 ns - prevents shoot-through in synchronous rectifier stage while maintaining efficiency. |
Pinout & Package
The LTC3806EDE#PBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed pad (Pin 13), which must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE (12) | Current sense input | Connects to source of primary MOSFET; internal leading-edge blanking avoids false triggering during switching transitions. |
| SS (10) | Soft-start control | Sets ramp rate of current threshold via external capacitor; reduces inrush current for PoE-compliant startup. |
| G2 (8) | Secondary-side gate driver | Drives synchronous rectifiers on secondary winding; enables high-efficiency, low-loss rectification. |
| G1 (9) | Primary-side gate driver | Drives N-channel MOSFET on primary side; supports high-side configuration with bootstrap or isolated supply. |
| GND (7,13) | Ground reference | Pins 7 and 13 (exposed pad) are common ground; pad must be thermally and electrically connected to PCB ground plane. |
| RUN (1) | Enable/disable control | Programmable UVLO input with 1.230 V rising threshold and 91 mV hysteresis for robust input monitoring. |
| ITH (2) | Error amplifier output | Controls current comparator threshold; voltage range 0–1.4 V defines peak current limit during regulation. |
| FB (3) | Feedback input | Compares divided output voltage to 1.230 V reference; determines regulation accuracy of master output. |
| VIN (5) | Main supply input | Accepts 10–72 V input; powers internal circuitry and supplies gate drivers via INTVCC regulator. |
| INTVCC (6) | Internal regulator output | 6.9 V regulated supply for gate drivers and logic; requires ≥4.7 μF low-ESR ceramic capacitor to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous flyback topology | Enables >90% efficiency and superior cross-regulation between multiple outputs vs nonsynchronous designs. |
| Programmable soft-start | External capacitor on SS pin controls inrush current ramp-critical for IEEE 802.3af/at Power over Ethernet compliance. |
| High maximum duty cycle | 89% typical allows wide input range (36–72 V) to support legacy 48 V telecom and emerging 54 V industrial systems. |
| Integrated 6.9 V regulator | Supplies up to 50 mA to gate drivers and logic-eliminates need for external bias supply in most configurations. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and excellent transient response to load steps on any output. |
Applications
| 48V Telecom Supplies | Power Over Ethernet |
|---|---|
Use Scenario: Dual-output DC/DC converter powering line cards and interface modules in central office equipment with 48 V backplane input. IC Role / Device Role / Timing Role: Primary controller managing synchronous rectification, cross-regulation, and soft-start sequencing across 3.3 V and 2.5 V rails. Use Value: Achieves >88% efficiency at full load and maintains <±3% cross-regulation between outputs under dynamic load changes. | Use Scenario: Midspan or endpoint PSE/PD power conversion meeting IEEE 802.3af/at Class 3/4 requirements with strict inrush limits. IC Role / Device Role / Timing Role: Flyback controller enforcing controlled startup via SS pin and accurate input monitoring via RUN pin hysteresis. Use Value: Soft-start capacitor value directly sets inrush current envelope-enabling reliable handshaking and classification without external current limiting. |
| 24V Industrial | VoIP Phone |
Use Scenario: DIN-rail mounted power module converting 24 V DC to isolated 3.3 V and 5 V outputs for PLC I/O and sensor interfaces. IC Role / Device Role / Timing Role: Synchronous flyback controller delivering tight regulation and low standby current (<90 μA shutdown IQ). Use Value: Low quiescent current extends hold-up time during brownouts; 85°C ambient rating supports unventilated enclosures. | Use Scenario: Compact wall-powered VoIP telephone requiring isolated dual-rail supply (3.3 V for MCU, 2.5 V for codec) from AC adapter. IC Role / Device Role / Timing Role: Integrated controller with internal 6.9 V regulator eliminating auxiliary winding and reducing BOM count. Use Value: Single-chip solution reduces footprint by >40% vs discrete controller + LDO approach; DFN package enables low-profile layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#PBF | Primary-side sensing only; no secondary-side gate driver; requires optocoupler for regulation; 100 V VIN max. | Used where isolation barrier feedback is preferred; lacks synchronous rectification capability. | Select when secondary-side sensing is impractical and efficiency >90% is not required. |
| UCC28911DR | Primary-side regulated, 700 V integrated MOSFET, no secondary driver; 100 kHz max frequency; no programmable UVLO. | Targeted at low-cost, single-output AC/DC adapters-not suitable for multi-output telecom or PoE. | Choose for cost-sensitive, low-power AC/DC applications where synchronous rectification is unnecessary. |
Compared with LT3748EMSE#PBF and UCC28911DR, the LTC3806EDE#PBF uniquely integrates dual gate drivers, synchronous rectification control, and programmable soft-start-making it the only option among the three capable of achieving <±3% cross-regulation in dual-output 48 V telecom supplies without optocouplers or external drivers.
Availability
LTC3806EDE#PBF is available at Aetrix Electronics and suitable for 48V telecom supplies, Power over Ethernet systems, and 24V industrial embedded power designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC3806EDE#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 ICs, serving precision, industrial, automotive, and communications markets.
The LTC3806EDE#PBF belongs to Linear's high-efficiency DC/DC controller product line, engineered specifically for multi-output synchronous flyback topologies in space-constrained, high-reliability telecom and industrial power systems.
FAQ
What is the maximum input voltage supported by the LTC3806EDE#PBF?
The LTC3806EDE#PBF supports a maximum input voltage of 72 V per Absolute Maximum Ratings. Its operational input range is specified from 10 V to 72 V, with minimum operating voltage dependent on the programmed undervoltage lockout threshold. The device includes internal protection against overvoltage stress on the VIN pin and regulates internal circuitry via the INTVCC rail.
How does the LTC3806EDE#PBF achieve cross-regulation between multiple outputs?
The LTC3806EDE#PBF achieves cross-regulation through forced continuous conduction mode and synchronous rectification on the secondary side. It regulates only the master output (via FB pin) but maintains tight coupling between outputs using transformer action and low-RDS(on) MOSFETs. The controller's current-mode architecture and high duty cycle (89% typical) improve energy transfer consistency across varying loads on slave outputs.
Can the LTC3806EDE#PBF be used without an optocoupler in isolated flyback designs?
Yes, the LTC3806EDE#PBF supports optocoupler-less isolated flyback operation using secondary-side sensing. Its G2 gate driver directly controls synchronous rectifiers, and regulation is maintained via the FB pin connected to the master output. This eliminates the need for optocouplers or TL431 references in many dual-output telecom and industrial applications, improving reliability and reducing component count.
What thermal considerations apply to the LTC3806EDE#PBF in high-power applications?
The LTC3806EDE#PBF has a thermal resistance θJA of 34°C/W in its 12-lead DFN package. Junction temperature must remain ≤125°C. At high input voltages and large MOSFET gate charges, dynamic current (QG × fOSC) dominates total supply current. Thermal design must account for both static IQ (≤140 μA start-up) and gate drive current-especially when using high-QG MOSFETs above 48 V input.
Is the LTC3806EDE#PBF pin-compatible with other members of the LTC38xx family?
No, the LTC3806EDE#PBF is not pin-compatible with other LTC38xx controllers such as LTC3803 or LTC3805. Its 12-pin DFN layout, dual gate driver assignment (G1/G2), dedicated SENSE and SS pins, and absence of COMP/VC pins reflect its unique synchronous flyback architecture. Substitution requires board-level redesign and validation of timing, drive strength, and feedback loop stability.
LTC3806EDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 10V ~ 25V
- Frequency - Switching:
- 250kHz
- Duty Cycle (Max):
- 89%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3806EDE#PBF FAQ
1.How can I place an order for LTC3806EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3806EDE#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 LTC3806EDE#PBF reliable?
The price and inventory of LTC3806EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3806EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3806EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3806EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3806EDE#PBF?
LTC3806EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3806EDE#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 LTC3806EDE#PBF?
For technical support, including LTC3806EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3806EDE#PBF requirements.
6.How does Aetrix verify that LTC3806EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3806EDE#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 LTC3806EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3806EDE#PBF?
All LTC3806EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3806EDE#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 LTC3806EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3806EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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